700+whp B7 RS4

[cosworthsti]

I have to ask and I'm not being an idiot about this but why do RS4s have such trouble making power with the SC kits? I haven't seen one kit break 600whp. Let me give you an example. My SL55 right now has a pulley, ec tune, he, ic pump, intake, headers and is making 562whp and 612wtq on the dyno. Remember these are wheel figures. Now all this cost me under $5000. yes the 5.4 in the SL is larger than the 4.2 in the RS4 however I'm running a stock blower which while efficient is quite small. Now I could, on the stock blower, make over 630whp if I add cooling, ported heads, injectors and fuel rail and all this with a 1.85l blower. Why aren't there any SVT Cobra style whipples for the RS4 like a 4.0, those guys are pushing 700whp and their engines are 4.6s. I love the RS4 but even with the top SC kit right now its way underpowered and its a shame since with the awd it would be a beast if it pushed 700whp or more. If im wrong then correct me as maybe I dont know about all the kit that exist. by the way im on stock internals in my sl as are most 55k tuned cars since our internals are very very sturdy so i assume the rs4s are too since its a quality brand.

i could see a good kit being a 4.7 stroker, massive top mount whipple style SC with integrated cooling and looped fuel rail and from there you would take care of the internals of course etc etc but it would surely make alot of power.

[big_tugg]

Interesting you mentioned this because I was thinking the same thing. I got a 1000rwhp TT Impala and I was looking around for a fast DD. I was thinking on pulling the trigger on a 2012 CTS-V but someone mentioned an RS4 to me because of AWD. I was looking at the SC kit and for 14k to give 100ish HP is wow...Then the whole carbon thing, is something I just don't understand...I was about to create a post trying to get all the information possible for this vehicle because my mom wants to pull the trigger today if I am gonna get it, but it is just so much about the this vehicle I don't understand!!!!

[cosworthsti]

Interesting you mentioned this because I was thinking the same thing. I got a 1000rwhp TT Impala and I was looking around for a fast DD. I was thinking on pulling the trigger on a 2012 CTS-V but someone mentioned an RS4 to me because of AWD. I was looking at the SC kit and for 14k to give 100ish HP is wow...Then the whole carbon thing, is something I just don't understand...I was about to create a post trying to get all the information possible for this vehicle because my mom wants to pull the trigger today if I am gonna get it, but it is just so much about the this vehicle I don't understand!!!!

Well Twin Turbo isn't possible due to the engine compartment size and a rear mounted turbo setup is either also impossible or it wouldn't be as responsive. As for a twincharged setup with rear mounted turbos you'd need a clutch type SC to disengage when the turbos take over and tuning it would be harder etc. The solution I see is a stroker kit and a HUGE whipple style blower. The SVT Cobras do it so why not this. I LOVE this car due to the AWD so its such a shame it can't make real power.

[BenSti]

I have to ask and I'm not being an idiot about this but why do RS4s have such trouble making power with the SC kits? I haven't seen one kit break 600whp. Let me give you an example. My SL55 right now has a pulley, ec tune, he, ic pump, intake, headers and is making 562whp and 612wtq on the dyno. Remember these are wheel figures. Now all this cost me under $5000. yes the 5.4 in the SL is larger than the 4.2 in the RS4 however I'm running a stock blower which while efficient is quite small. Now I could, on the stock blower, make over 630whp if I add cooling, ported heads, injectors and fuel rail and all this with a 1.85l blower. Why aren't there any SVT Cobra style whipples for the RS4 like a 4.0, those guys are pushing 700whp and their engines are 4.6s. I love the RS4 but even with the top SC kit right now its way underpowered and its a shame since with the awd it would be a beast if it pushed 700whp or more. If im wrong then correct me as maybe I dont know about all the kit that exist. by the way im on stock internals in my sl as are most 55k tuned cars since our internals are very very sturdy so i assume the rs4s are too since its a quality brand.

i could see a good kit being a 4.7 stroker, massive top mount whipple style SC with integrated cooling and looped fuel rail and from there you would take care of the internals of course etc etc but it would surely make alot of power.

Couple things from what I understand.

1. There is not much room to put a blower, apparently AMD has a TVS2300 in the works, so perhaps that can do enough power, but I am not sure you would be able to fit enough cooling under the hood to max the blower.

2. You are likely going to be limited by the fuel injectors/pumps at that point. This is a direct injection motor, so there isn't really a easy upgrade to be had. Perhaps you could run auxiliary injectors in the manifold, but that would be pretty damn excessive.

3. Stroker kit probably isn't possible on this motor, it is already such high piston speeds, that a stroker kit would cause major problems, you can't bore it out, because you have about 5mm between cylinders.


This isn't the car to try and make big power out of. Respect it for what it is, it's a high revving, lightweight, small displacement V8, not some big Chevy or Ford motor that revs to 6200rpm. There is something special about the car, the motor, and the feel of 8300RPM. Not to mention, the car was designed for road course type handling, not high HP drag. 700WHP is more than anybody would need in a car like this, even 500whp is likely more than needed.

With boltons, you can get to about 370whp, with a blower, likely 550whp, maybe more. Nobody has maxed one of these motors yet as far as I know. I guess in my opinion, trying to make 700whp out of this car is stupid. It won't be reliable, will cost a ton, and will defeat the point. If somebody wants to do it, I will be quite impressed.

[cosworthsti]

Couple things from what I understand.

1. There is not much room to put a blower, apparently AMD has a TVS2300 in the works, so perhaps that can do enough power, but I am not sure you would be able to fit enough cooling under the hood to max the blower.

2. You are likely going to be limited by the fuel injectors/pumps at that point. This is a direct injection motor, so there isn't really a easy upgrade to be had. Perhaps you could run auxiliary injectors in the manifold, but that would be pretty damn excessive.

3. Stroker kit probably isn't possible on this motor, it is already such high piston speeds, that a stroker kit would cause major problems, you can't bore it out, because you have about 5mm between cylinders.


This isn't the car to try and make big power out of. Respect it for what it is, it's a high revving, lightweight, small displacement V8, not some big Chevy or Ford motor that revs to 6200rpm. There is something special about the car, the motor, and the feel of 8300RPM. Not to mention, the car was designed for road course type handling, not high HP drag. 700WHP is more than anybody would need in a car like this, even 500whp is likely more than needed.

With boltons, you can get to about 370whp, with a blower, likely 550whp, maybe more. Nobody has maxed one of these motors yet as far as I know. I guess in my opinion, trying to make 700whp out of this car is stupid. It won't be reliable, will cost a ton, and will defeat the point. If somebody wants to do it, I will be quite impressed.

Well the problem is it's not exactly a light car and the power is just too low. Yes, on a road course rarely will you get all the power out but on the road and straight line performance you just cannot escape power. For me I loved something about this car and thought maybe it could get more HP. At this point I'm probably going with a GT-R and throwing an AMS Alpha 12 kit eventually if the funds permit but yes coming from an insane torque SL55 it makes it hard to justify the RS4 if it isn't making massive power. Problem is this car should be making it because the AWD would really shine.

I get most of the RS4s issues are with engine bay space. Plus if you're right about the stroke being already long then I guess a stroker is out too. Such a shame considering the B5 RS4s are running 9s quarter miles and making over 800hp.

[bangoman]

There is the TTS/MRC supercharger kit. They ran 11.42 @ 125 in the UK on pump fuel: http://youtu.be/MbAj7rkcRB4.

I believe it's the fastest ever Audi sedan on pump. It is looks and sounds awesome! TTSRS4 (read from here and down), the owner, is hell bent on turning up the boost until the engine breaks so we will see what the engine's limits are. Register and post in that thread as TTSRS4 is sometimes on there and has been happy to answer questions. The TTS and MRC guys are on there too.

I can't for the life of me find out what they dyno'd on the most recent tune. This is the most recent video I could find: http://www.youtube.com/watch?v=diOgJMSv7mI

About 600hp and 450 lb.ft.

I'm surprised BenSTI didn't mention it as if I owned an RS4 (I don't I just like this MRC/TTS car), I would be pretty excited about this. Unless it's the fact it's a UK company not selling in North America yet.

[bangoman]

Couple things from what I understand.

1. There is not much room to put a blower, apparently AMD has a TVS2300 in the works, so perhaps that can do enough power, but I am not sure you would be able to fit enough cooling under the hood to max the blower.

2. You are likely going to be limited by the fuel injectors/pumps at that point. This is a direct injection motor, so there isn't really a easy upgrade to be had. Perhaps you could run auxiliary injectors in the manifold, but that would be pretty damn excessive.

3. Stroker kit probably isn't possible on this motor, it is already such high piston speeds, that a stroker kit would cause major problems, you can't bore it out, because you have about 5mm between cylinders.


This isn't the car to try and make big power out of. Respect it for what it is, it's a high revving, lightweight, small displacement V8, not some big Chevy or Ford motor that revs to 6200rpm. There is something special about the car, the motor, and the feel of 8300RPM. Not to mention, the car was designed for road course type handling, not high HP drag. 700WHP is more than anybody would need in a car like this, even 500whp is likely more than needed.

With boltons, you can get to about 370whp, with a blower, likely 550whp, maybe more. Nobody has maxed one of these motors yet as far as I know. I guess in my opinion, trying to make 700whp out of this car is stupid. It won't be reliable, will cost a ton, and will defeat the point. If somebody wants to do it, I will be quite impressed.

Of course, maybe Ben is making his own exhaust and is also maybe getting involved with the AMD supercharger hence no mention of MRC/TTS. Regarding the points above:

JHM managed to squeeze a reasonably sized blower into the B6/7 S4's equally cramped engine bay. It's the rods/pistons holding them back there. Apparently they had to dial back the boost to save the engines. Similarly the TTS blower has more room to grow. We shall see what TTSRS4 gets out of it.

"Not to mention, the car was designed for road course type handling, not high HP drag" But fook me isn't that 11.42 something very special. Fast is fast. As a comparison, a stock RS4 does about 12.75 to 12.9 in 1/4 mile.

"700WHP is more than anybody would need in a car like this, even 500whp is likely more than needed." Maybe it's stupid but we're all stupid from taking our perfectly good cars and modding the shit out of them. That TTS/MRC car is making 600 awhp and as I understand it, the owner uses it for the school run.

I have nothing to do with the RS4, JHM, MRC or TTS. Ben is making exhausts, LW battery kits and Ram Air kits, the development of which is happening on quattroworld.

[bangoman]

Well the problem is it's not exactly a light car and the power is just too low. Yes, on a road course rarely will you get all the power out but on the road and straight line performance you just cannot escape power. For me I loved something about this car and thought maybe it could get more HP. At this point I'm probably going with a GT-R and throwing an AMS Alpha 12 kit eventually if the funds permit but yes coming from an insane torque SL55 it makes it hard to justify the RS4 if it isn't making massive power. Problem is this car should be making it because the AWD would really shine.

I get most of the RS4s issues are with engine bay space. Plus if you're right about the stroke being already long then I guess a stroker is out too. Such a shame considering the B5 RS4s are running 9s quarter miles and making over 800hp.

If you're looking at a Nissan GT-R those things are just INSANE! I was at the strip on Fri and two of those things were just running high 10's/mid 11's all day long with no drama. For out and out power GT-R hands down whether it's the strip or the twisties. Daily driver 4 doors and a boot would be the main thing in favour of the RS4.

[cosworthsti]

If you're looking at a Nissan GT-R those things are just INSANE! I was at the strip on Fri and two of those things were just running high 10's/mid 11's all day long with no drama. For out and out power GT-R hands down whether it's the strip or the twisties. Daily driver 4 doors and a boot would be the main thing in favour of the RS4.

Well getting a stock GT-R is not a problem, my goal is to throw an Alpha 12 kit on it and run it on race gas when I want to drive it. It's not like it's gonna be a daily so it shouldn't be an issue and on race gas those things are pushing 1350whp. AMS just set a record of mid 8s at over 172mph. The crazy thing is that unlike most 8s cars it's not stripped out or sitting on tall radials and it's very stable. The technology in that car is just unmatched, other cars can't compete simply because of it's advanced technology. That gearbox does PERFECT shifts everytime and the independent wheel traction control is just epic. I've driven a Switzer P800 and the thing just deals with the power like it's stock. Honestly anybody looking for all out speed the GT-R is hard to beat. AMS also did the Texas Mile clocking over 230mph I think!!

As for the RS4 running mid 11s well my SL ran an 11.09 on radials and I was looking for something MUCH faster. The thing is that the SL is a boat anchor, it weighs more than a ship lol. If I had my parts and maybe injectors/fuel rail, cooling and ported heads in an E55 which is much lighter and has better drag coefficient I could run mid to low 10s. For the RS4 I was looking more like high 9s. I would happily run it on race gas as it's not a daily but I don't think a race gas tune is gonna jump it from 11s to 9s.

[bangoman]

I think it sounds like the GT-R is the one for you. The RS4 may one day get below 11's but not right now. For right now, it's gotta be the GT-R. As for your SL vs the RS4, that's a sports coupe vs AWD 4 door sedan.

[BenSti]

Of course, maybe Ben is making his own exhaust and is also maybe getting involved with the AMD supercharger hence no mention of MRC/TTS. Regarding the points above:

JHM managed to squeeze a reasonably sized blower into the B6/7 S4's equally cramped engine bay. It's the rods/pistons holding them back there. Apparently they had to dial back the boost to save the engines. Similarly the TTS blower has more room to grow. We shall see what TTSRS4 gets out of it.

"Not to mention, the car was designed for road course type handling, not high HP drag" But fook me isn't that 11.42 something very special. Fast is fast. As a comparison, a stock RS4 does about 12.75 to 12.9 in 1/4 mile.

"700WHP is more than anybody would need in a car like this, even 500whp is likely more than needed." Maybe it's stupid but we're all stupid from taking our perfectly good cars and modding the shit out of them. That TTS/MRC car is making 600 awhp and as I understand it, the owner uses it for the school run.

I have nothing to do with the RS4, JHM, MRC or TTS. Ben is making exhausts, LW battery kits and Ram Air kits, the development of which is happening on quattroworld.

Please don't bring the childish games and baseless assumptions from AudiRevolution here.

Yes, I am making an exhaust system, your points is? I have not talked to AMD nor am I working with them, however the reason I mentioned their kit is that they are using a blower designed for 900+HP, the Rotex used by MRC/TTS isn't, neither is the Vortech unit used by JHM. That is not to discredit either of those blowers, but the point is with the typical 28% drivetrain loss on a RS4, you would need almost 900chp to make 700WHP, which is a lot more than the Rotex or Vortech blowers are rated for.

That being said, yes 11.42 is very fast for a 3800lb luxury car, but their kit isn't making 600awhp, it is making 620PS, which is 611bhp, or 440whp. This is asking about well over 50% more power, something you likely won't be able to do on the stock internals.

I have nothing to do with JHM, MRC, or TTS either, I am simply making products that don't exist that I want for my own car, and guess what? Other people want them too. It is funny that you complain when I make products to help improve the platform, but then praise everybody else.

[BenSti]

I think it sounds like the GT-R is the one for you. The RS4 may one day get below 11's but not right now. For right now, it's gotta be the GT-R. As for your SL vs the RS4, that's a sports coupe vs AWD 4 door sedan.

This, if you want a car to make big power with, a GTR is probably your best choice. I heard you can make almost 600whp on stock turbos/exhaust running E85 and a tune.

[Slow4]

I am simply making products that don't exist that I want for my own car, and guess what? Other people want them too. It is funny that you complain when I make products to help improve the platform, but then praise everybody else.

Not to derail but details on this? RS4 only?

[cosworthsti]

Thanks for the info guys, I guess the GT-R is hard to beat right now :D ...but God I love the sound and feel of the Audi, it's hard to explain and I'm sure you guys know what I mean because I've been in it and the car feels so nice and from the outside it's just gorgeous. If it had more engine room so many things would be possible.

By the way does the RS4 lose 28%?!! My SL55 loses ~18% through the drivetrain so it's kind of shocking to hear 28%. I know AWD loses more but wow 28%.

[bangoman]

cosworth, if you've got the Audi bug, then get the RS4. I agree, there's a certain feel for the Audis, I think it's their interiors. I'm sure there's more to come for the RS4...

I have nothing to do with JHM, MRC, or TTS either, I am simply making products that don't exist that I want for my own car, and guess what? Other people want them too. It is funny that you complain when I make products to help improve the platform, but then praise everybody else.

I have no problem with you making your own parts; I wish you the best of luck... I just don't think you're an unbiased end user anymore.

[B6UltraSport]

Please don't bring the childish games and baseless assumptions from AudiRevolution here.

Yes, I am making an exhaust system, your points is? I have not talked to AMD nor am I working with them, however the reason I mentioned their kit is that they are using a blower designed for 900+HP, the Rotex used by MRC/TTS isn't, neither is the Vortech unit used by JHM. That is not to discredit either of those blowers, but the point is with the typical 28% drivetrain loss on a RS4, you would need almost 900chp to make 700WHP, which is a lot more than the Rotex or Vortech blowers are rated for.

That being said, yes 11.42 is very fast for a 3800lb luxury car, but their kit isn't making 600awhp, it is making 620PS, which is 611bhp, or 440whp. This is asking about well over 50% more power, something you likely won't be able to do on the stock internals.

I have nothing to do with JHM, MRC, or TTS either, I am simply making products that don't exist that I want for my own car, and guess what? Other people want them too. It is funny that you complain when I make products to help improve the platform, but then praise everybody else.

Can I get more info on this exhaust? Are you just making 1 or 2 units, or planning on "mass" producing? I tried to send a PM but your inbox is full!

[audi1234]

just to inform you alittle on the GTR since u think the transmission is so great. Have u checked into it at all? From my understanding and from some nissan techs they have GTR in all the time for transmission problems not to mention that they are blowing up quite easily.

[Auditude2.0T]

Just get an RS4, pull the motor and put in AAN 5 cylinder from the old UrS4. With a GT35R and E85 you can make 800+whp. I'm on a 30R and a built motor on my UrS4 and should be over 525whp with E85. If I swap injectors, manifold and turbo I can make close to 1000whp

[cosworthsti]

Just get an RS4, pull the motor and put in AAN 5 cylinder from the old UrS4. With a GT35R and E85 you can make 800+whp. I'm on a 30R and a built motor on my UrS4 and should be over 525whp with E85. If I swap injectors, manifold and turbo I can make close to 1000whp

What about the response though, 1000whp means very little if it can't be tamed and if it's not smooth on delivery. Not that those 5 cyls aren't amazing because I've seen them and I can't say I'd be confident racing them However for me I love low end torque, I mean my SL is making 612wtq right now at 2000rpm, that's wheel ft lb of torque at 2000rpm I can even post the sheet if you want. If I added say ported heads, top mount coolers and fuel rail/injectors I'd be making over 700wtq as have some 55k owners I know which is the same as a Veyron since this is wheel figures and if you count 18% loss the engine figure is over 900 crank tq...at 2000rpm So my point is I do love low end torque because I did think about the B5 RS4 but for me the looks and interior of the B7 can't be matched by the B5 and I can't buy a B7 and drop the engine, value would be GOOOONE!! Maybe on a custom A4 B7 but on an RS4....

just to inform you alittle on the GTR since u think the transmission is so great. Have u checked into it at all? From my understanding and from some nissan techs they have GTR in all the time for transmission problems not to mention that they are blowing up quite easily.

Not really I mean I've heard some but AMS build the hell out of it. As opposed to the UGR Gallardos the AMS GT-Rs have had a pretty good track record of reliability. I think they even offer warranty! The GT-R is a different beast though and while faster than the RS4 the RS4 feels really good to drive. They both do. Right now I'm not gonna be able to drop an AMS Alpha 12 package straight away but maybe in 3-4 months I'll be able to. Not the cheapest package but when you consider how strong the gearbox is and how much sheer power it's making and how fast it is you do appreciate it.

[BlownRs4]

I say go buy a gtr :) Ooohh btw I've drive both a 650bhp and an 800bhp one over here in the uk, honest opinion?? Not a DD in the slightest the gear changes are NOT smooth at all the Dsg used in audi's etc is better by far! can you fit a golf clubs in the boot plus your mates to play a round with? You'll hear comments like that all day but truth is your comparing cars that aren't comparable :) ! By the way my car is the 11.42 1/4 mile rs4 and it was done on street tires and a babyseat in the rear, your SL on drag radials again isn't comparable to that! I've pulled my engine for a colour change on my car at the same time I'll be looking into rods so I can run more boost and possibly nitrous so I'd keep checking in on progress over the next few months. I'm very rarely on the us forums but there's plenty of uk forums you can follow threads of my current builds (b7 rs4 and b5 s4 wb 750bhp+)

[BlownRs4]

Welcome! Do you have a build thread on another forum we could follow? I am very interested to see what you are doing.

For Rods, look into http://www.shop-pankl.com/connecting...audi-rs4-3255/

I checked up on those rods around six months ago with no response from

[BlownRs4]

I checked up on those rods with pankl direct around six months ago with no reply. After a bit of research I found out there actually correlio and made in a factory in the uk, so I can have rods made! I don't think the pistons will be needed. There's threads on the previous supercharger builds this ones been a little more quiet. We've tried different exhausts, headers etc on the car this time searching for the correct combination and we may also be trying different cams as well! I'll try as best I can to keep you up to date over here but check out audisrs.com and rs246 from time to time

[MMMB00ST_A4]

COWL HOOD FTW!!! B7 RS4 making 700awhp, blown w/a cowl hood would make me soil my panties. Good Lord.....

[Arin@APR]

There are a few reasons why you've not seeing 600 + WHP from supercharged RS4's

1. The 4.2 is a rather small V8.
2. The supercharger units that fit, are not very large.
3. Producing more boost would require spinning the supercharger much faster than the manufacturer deems safe.
4. AWD zaps a bunch of power when comparing to other RWD or FWD vehicles.

[beemercer]

There are a few reasons why you've not seeing 600 + WHP from supercharged RS4's

1. The 4.2 is a rather small V8.
2. The supercharger units that fit, are not very large.
3. Producing more boost would require spinning the supercharger much faster than the manufacturer deems safe.
4. AWD zaps a bunch of power when comparing to other RWD or FWD vehicles.

just because you guys didn't fit a bigger blower doesn't mean its not possible

[Peter1.8t]

AMD is developing a SC kit for the rs4. I've seen it. No clue to how much power its going to put down, but knowing AMD it should be enough.

[Arin@APR]

just because you guys didn't fit a bigger blower doesn't mean its not possible

I didn't say it wasn't possible.

I'm also not looking to argue or to sound like I know it all. Just sharing some info as to why it's 2012, 4 years after the RS4 saw its last production year, and there aren't 600 AWHP chargers all over the place.

[WinterRunner]

24-28% drivetrain loss is typical for quattro....... Get a GT-R.

[musanoadsaba]

How much different is the AWD drivetrain loss in a GTR?

[SpeedETC]

1. There is not much room to put a blower, apparently AMD has a TVS2300 in the works, so perhaps that can do enough power, but I am not sure you would be able to fit enough cooling under the hood to max the blower.

I haven't been following this closely, but I thought AMD was using the 1900...?

[BenSti]

I haven't been following this closely, but I thought AMD was using the 1900...?

I have been told by several different people that the blower they are using is a 2300. I am willing to bet they will get into trouble with the belt due to the high rotating mass of the blower internals.

[BUD-S4]

There are a few reasons why you've not seeing 600 + WHP from supercharged RS4's

1. The 4.2 is a rather small V8.
2. The supercharger units that fit, are not very large.
3. Producing more boost would require spinning the supercharger much faster than the manufacturer deems safe.
4. AWD zaps a bunch of power when comparing to other RWD or FWD vehicles.

Seriously? This from a tuner? Come on man.

This is why we haven't seen a 600+ whp RS4! The mind set of a tuner that is not willing to push a platform forward.

Just sharing some info as to why it's 2012, 4 years after the RS4 saw its last production year, and there aren't 600 AWHP chargers all over the place.

600whp, or damn near close, is possible as we have already seen by MRC. Running a quarter in 11.42 @125mph (WITH FULL INTERIOR). I think the fact that its 2012, 4 years after we saw that last rs4 produced, is a good thing. Now that these cars are a bit cheaper I believe people will be more willing to drop money into them and push them closer to their limit.

just because you guys didn't fit a bigger blower doesn't mean its not possible

BOOM.

[S4Per]

I have been told by several different people that the blower they are using is a 2300. I am willing to bet they will get into trouble with the belt due to the high rotating mass of the blower internals.

Sorry, Ben, I'm very (very) far from being an expert here...can you expand a bit on the above i.e. what exact trouble you're referring to?

TIA,
Per

[BlownRs4]

AMD is developing a SC kit for the rs4. I've seen it. No clue to how much power its going to put down, but knowing AMD it should be enough.

I have several cad drawings of the Amd kit plus pictures of the blowers and also pictures of their trial fitting in there test car/cars. They are using both the 1900 and 2300 from what I've seen, I hope that they intend on running a bigger pulley because in the pictures it looks as small as a four rib cheap plastic looking belt.

[NY07RS4]

I have to ask and I'm not being an idiot about this but why do RS4s have such trouble making power with the SC kits? I haven't seen one kit break 600whp. Let me give you an example. My SL55 right now has a pulley, ec tune, he, ic pump, intake, headers and is making 562whp and 612wtq on the dyno. Remember these are wheel figures. Now all this cost me under $5000. yes the 5.4 in the SL is larger than the 4.2 in the RS4 however I'm running a stock blower which while efficient is quite small. Now I could, on the stock blower, make over 630whp if I add cooling, ported heads, injectors and fuel rail and all this with a 1.85l blower. Why aren't there any SVT Cobra style whipples for the RS4 like a 4.0, those guys are pushing 700whp and their engines are 4.6s. I love the RS4 but even with the top SC kit right now its way underpowered and its a shame since with the awd it would be a beast if it pushed 700whp or more. If im wrong then correct me as maybe I dont know about all the kit that exist. by the way im on stock internals in my sl as are most 55k tuned cars since our internals are very very sturdy so i assume the rs4s are too since its a quality brand.

i could see a good kit being a 4.7 stroker, massive top mount whipple style SC with integrated cooling and looped fuel rail and from there you would take care of the internals of course etc etc but it would surely make alot of power.

What company are you purchasing parts from? RennTech? Brabus? Kleeman? Evoms? You're pricing seems a tad low, especially since you have headers listed. On a side note, I do miss the tq of my past AMG cars. The RS4 is a completely different animal in so many aspects it's hard to compare them.

[BenSti]

Sorry, Ben, I'm very (very) far from being an expert here...can you expand a bit on the above i.e. what exact trouble you're referring to?

TIA,
Per

Basically, my understanding is because of the mass of the spinning internals of the blower, when you try to rev the car quickly, it puts tremendous strain on the belts trying to accelerate/decelerate the internals. The larger the blower, the larger the internals are and thus it takes more work to spin the internals

[vdubjetta02]

What company are you purchasing parts from? RennTech? Brabus? Kleeman? Evoms? You're pricing seems a tad low, especially since you have headers listed. On a side note, I do miss the tq of my past AMG cars. The RS4 is a completely different animal in so many aspects it's hard to compare them.

exactly a Headerback exhaust system on an AMG car can run your $7,000 .......

[S4Per]

Basically, my understanding is because of the mass of the spinning internals of the blower, when you try to rev the car quickly, it puts tremendous strain on the belts trying to accelerate/decelerate the internals. The larger the blower, the larger the internals are and thus it takes more work to spin the internals

Cheers. Makes sense.
I'll be stopping by AMD in the next couple of weeks...hope to get some type of update on progress then.

[cosworthsti]

buying kleeman, renntech or brabus is just stupid. they charge you over 6k for a stage 1 pulley. no, i never even considered them when i started modding. eurocharge is miles ahead, i've had no issues with them and their prices are very reasonable. as for the headers my headers are custom long tubes made by one of the forum members on mbworld, the guy knows his stuff and has built over 30 full engines and has made some really great custom parts. honestly the 55k isnt as expensive to tune as i thought IF you play it smart and not get ripped off by kleeman, evosport, renntech etc. For ~10k you'll have a mid 10s E55 easily for example and the engines are built well from factory, most guys are still on stock bottom end, even rods.

[cosworthsti]

you dont need header-back, for actual power you don't need a full supersprint which rapes your wallet. all you need is a good long tube headers and cat delete. that'll give you great flow and if you want you can get a custom exhaust done by a good local shop. that's what i did. while supersprint and eisenmann etc are good full exhaust systems they're extremely expensive. again, it depends on how you tune the thing and modify it, if you go with a company like evosport who will rape you just to get stage 1, not even 570 crank HP.