APR Motorsport Build Thread!

[Keith@APR]

http://www.goapr.com/news/wp-content/uploads/2009/10/APR-BBQ-9.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5786.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5781.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5763.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5747.jpg

[NoTec]

I love diets.[:)]

[vwong]

Subscribed!!! [up]

[akasch]

subscribed also!

[leviathan18]

are you going to sell the left overs ?????

[Keith@APR]

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5811.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5794.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5801.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5803.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5806.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5807.jpg

[leviathan18]

i love your work, i love to do things like that, but i think i could cry stripping a new S4 like that LOL

[Arin@APR]

are you going to sell the left overs ?????

Yes. I've taken a photo of every single component we've pulled form the car and everything will be fore sale. :)

[JRMSLINEA4]

Very cool. What cooler is that on the drivers side?

[Keith@APR]

Very cool. What cooler is that on the drivers side?

OEM auxiliary aftercooler

[AFizzle87]

Lol keith always has a cup of coffee in his hand, i want those seats [hail] !!!!!! when u have a price set for them pm me please

[NWS4Guy]

As I said on the Quattroworld thread - wow. Immaculate teardown, and very detailed. I am astounded how fast you guys have been able to completely gut the interior.

[Phantom S5]

I love it. Can't wait for mods to come out.

[Keith@APR]

Lol keith always has a cup of coffee in his hand, i want those seats [hail] !!!!!! when u have a price set for them pm me please

um, yeeaaaah, coffee is greeeaaattt.

http://4.bp.blogspot.com/_TGI-Kgh7wWg/SBCELGOVXXI/AAAAAAAAAP8/VyrK7UthguY/s1600/bill-lumbergh-1_Full.jpg

Figure I would before someone else does![:D]

[Wizard-of-OD]

Were you guys bored?
LOL
looking good!

[Keith@APR]

stock weight is 3830 with half a tank of gas.

[NWS4Guy]

stock weight is 3830 with half a tank of gas.

Umm...wow, I'm guessing C&D weighed theirs with the driver in it to get 4K?

[Keith@APR]

Umm...wow, I'm guessing C&D weighed theirs with the driver in it to get 4K?

we have the stripper. no ads, no sport diff, no nav, no alcantara, etc....

[Arin@APR]

we have the stripper. no ads, no sport diff, no nav, no alcantara, etc....

Strippers.... Look good from the outside but not so much going on inside. And, well.... the rear end could be a bit sportier. ;)

[AofC_RR]

we have the stripper. no ads, no sport diff, no nav, no alcantara, etc....

No that car had nav there's a pic of the dash and shifter surround.

[Jbone29]

more pics pls!!:)

[NWS4Guy]

we have the stripper. no ads, no sport diff, no nav, no alcantara, etc....

Makes sense, except for the Alcantara...

Silk Napa (which I can see you have) costs MORE, and I doubt there is a huge weight difference there ;)

[NWS4Guy]

No that car had nav there's a pic of the dash and shifter surround.

Even without Nav, you have MMI, which uses the screen in the dash though right?

[Keith@APR]

Sorry for my mistake, yes it does have nav.

http://www.goapr.com/news/wp-content/uploads/2009/10/S4-Sticker.jpg

[NWS4Guy]

Ineresting...you get both the backup camera and the park sensors with Nav then? I know mine said camera, but was unsure about the park sensors.

[Ivan01]

http://www.audizine.com/gallery/data/500/s426.JPG



Do I see it the right way.
SC on top with 3 pulleys.
And thats the Side IC for supercharger?

[Arin@APR]

No. It's in the front of the car but it was removed in this photo.

[NWS4Guy]

No. It's in the front of the car but it was removed in this photo.

Yea, SC is there on top, the IC is down very low under the front bumper. Keith said up this post further it's an OEM after cooler - for what I am not sure.

First pic in this thread you can see the IC under the bumper dead center - it's shiny silver as opposed to painted black like the radiator/condensors are.

http://www.audizine.com/forum/showthread.php?t=309876


*** Edit - you can also see it in the 4th pic down from the first set in this thread, right under the aluminum bumper piece.

[Keith@APR]

Yea, SC is there on top, the IC is down very low under the front bumper. Keith said up this post further it's an OEM after cooler - for what I am not sure.

First pic in this thread you can see the IC under the bumper dead center - it's shiny silver as opposed to painted black like the radiator/condensors are.

http://www.audizine.com/forum/showthread.php?t=309876


*** Edit - you can also see it in the 4th pic down from the first set in this thread, right under the aluminum bumper piece.

there are 2 aftercoolers I think. I call them aftercoolers because its what the water recircs through for the actual intercoolers which are in the intake manifold assembly.

intercooler, the cores in the manifold the water flows through, cools the charge air.

aftercooler, the 2 typical intercooler looking guys behind the bumper, cools the water after its cooled the intercoolers which cool the internal air.

the primary aftercooler is the long fmic looking unit that's removed in that pic but referenced in earlier pics.

what he has circled is the secondary or auxiliary aftercooler I think. It could be an auxiliary radiator but I'm pretty sure I traced the lines to the intake manifold intercooler location although it was a cursory glance.

[L0U]

Wow, they are using liquid cooled coolers. This beast will make huge hp in the winter then. To get this right, the intercooler is in the plenum, and cooled by coolant. That then gives up the heat to 2 big rads in the front of the car, which are cooled via air flow?

Very good system, if that is what they are using. The rads are more of a heatsink, than aftercooler, but whatever. minus 10 degrees airflow in the winter could cool the coolant huge. It would freeze water.

The intercoolers performance/ charge cool, should be much better than an air to air type. Think water cooled computer chip vs. air cooled. There is lots of cooling without a massive pressure drop this way also.

[Ivan01]

there are 2 aftercoolers I think. I call them aftercoolers because its what the water recircs through for the actual intercoolers which are in the intake manifold assembly.

intercooler, the cores in the manifold the water flows through, cools the charge air.

aftercooler, the 2 typical intercooler looking guys behind the bumper, cools the water after its cooled the intercoolers which cool the internal air.

the primary aftercooler is the long fmic looking unit that's removed in that pic but referenced in earlier pics.

what he has circled is the secondary or auxiliary aftercooler I think. It could be an auxiliary radiator but I'm pretty sure I traced the lines to the intake manifold intercooler location although it was a cursory glance.

auxiliary aftercooler? have you seen the oilcooler yet?[wrench]

[NWS4Guy]

I'm pretty curious now myself L0U...

If they have a dual cooling system, that will be very efficient at removal of heat from the charged air, and as you say help tons in the power department.

[speedydragon]

aw the car doesn't come with a full size spare?

[mrbogangles]

aw the car doesn't come with a full size spare?

i was just going to say that

but yeah thats weird that it didnt

[riegeraudi]

Sorry for my mistake, yes it does have nav.

http://www.goapr.com/news/wp-content/uploads/2009/10/S4-Sticker.jpg

Silly of course it has to have nav, otherwise how is the driver supposed to find his way around the track?[:D] Also the rear camera's are for looking at the 335i's that they will pass. J/K.
So what cars are you guys going to be racing against? Any ideas?

[Keith@APR]

M3's, 997 911's, Factory Prepared Mustangs, Camaro's and I hear talk of STi's and EVO's this year too.

[Keith@APR]

http://www.goapr.com/news/wp-content/uploads/2009/10/Audi-3-0-V6-TFSI-Engine-with-Roots-Blower_Page_14.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/Audi-3-0-V6-TFSI-Engine-with-Roots-Blower_Page_36.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/Audi-3-0-V6-TFSI-Engine-with-Roots-Blower_Page_37.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/Audi-3-0-V6-TFSI-Engine-with-Roots-Blower_Page_38.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/Audi-3-0-V6-TFSI-Engine-with-Roots-Blower_Page_39.jpg

These are for the A6 version which is similar to the S4 but not exactly regarding the charge cooling system.

[Keith@APR]

auxiliary aftercooler? have you seen the oilcooler yet?[wrench]

Nope, but its definitely an auxiliary cooler for either the coolant system or the intercooler system depending on how you look at it.

[NWS4Guy]

Much thanks for the daigrams!

I'm still curious as to what that little aftercooler does, I see that the oil cooler is built in up near the SC and ties into the engine coolant lines, so it's not a seperate system to cool that.

I'm happy with this design which keeps the intercooler in a seperate loop from then engine coolant, but they do share the same overflow in order to hot have 2 totally seperate systems.

I can see how under stop and go, the SC being on top of the engine will get a lot of heat soak from the block itself, sitting on top of everything, but at speed, this should't be an issue with lots of moving air through the engine bay. Keeping these 2 apart save for the overflow tank should make the cooling efficiency as good as can be had by this system.

[L0U]

Mounting a larger intercooler rad, or installing a pump that increases flow should net some gains, especially in a car chipped pushing full boost. Sharing the same overflow means both loops are antifreeze. No real mixing will occur though, other than as the coolant swels from increased temperaure, it will go to the reservoir, then back into the loop once cooled(shrinks)

Intercooler rad gets the cool air before the engine rad.

The next time you guys dyno the car, put a big fan in front of thay heat exchanger. :) or is that were the gains came from. (also means the car makes more power at speed vs. sitting on the rollers)

[Ivan01]

wow so we got auxiliary(helping front cooler) getting cold to r+l side cooler to cool down SC I'am gessing. And sends hot back to auxiliary? Loosing my mind. Any ways that supercharger pulley looks to big. What is it 9 or 10?

[JRMSLINEA4]

A smaller pulley will allow the s/c to produce more boost if it can be removed for a smaller one. [evilsmile]

[Keith@APR]

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5813.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5815.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5817.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5822.jpg

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5824.jpg

[JRMSLINEA4]

Very cool. I see a bottleneck in the exhaust pipe just after the cat.

[Keith@APR]

http://www.goapr.com/news/wp-content/uploads/2009/10/B8-S4-0-60.bmp


http://www.goapr.com/news/wp-content/uploads/2009/10/b8-s4-0-60-zoomed.bmp

Measured wheel values by the P Box were as follows:

336awhp
328awhp
325awhp
331awhp

I can't figure out how to graph them so if anyone knows I'll email them the P Box files.

[Keith@APR]

Very cool. I see a bottleneck in the exhaust pipe just after the cat.

Its to clear the steering rack so it may have to stay.

[L0U]

that looks about 3.5 to 1. or at 7000rpm, the blower is turning 24,500 rpm. going a wee bit smaller on the upper blower pulley gets you to 4 to 1 pretty quick. The crank pulley can't go bigger or the belt will be to kinked. For the 1500 bucks I'd rather bolt 1 size bigger roots of the same type.

[L0U]

http://www.goapr.com/news/wp-content/uploads/2009/10/B8-S4-0-60.bmp


http://www.goapr.com/news/wp-content/uploads/2009/10/b8-s4-0-60-zoomed.bmp

Measured wheel values by the P Box were as follows:

336awhp
328awhp
325awhp
331awhp

I can't figure out how to graph them so if anyone knows I'll email them the P Box files.

seems that the first run the i/c was cooler, and performance dropped as it got hotter and hotter(heated that i/c rad coolant). was the 4rth run made with a bit of an interval where things cooled a bit extra?

[Keith@APR]

seems that the first run the i/c was cooler, and performance dropped as it got hotter and hotter(heated that i/c rad coolant). was the 4rth run made with a bit of an interval where things cooled a bit extra?

They weren't back to back or anything. I drove out to lunch and when the road looked flat, I hit a power pull.

Some were after cruising at 65 and then slowing down for the pull, some were leaving from a stop after sitting for a few.

I never did the coast down stuff to see what estimated crank was, I could do that this weekend and maybe get some datalogs too.

The 0-60's were collected somewhat back to back on the same flat spot of road but I would have to drive for half a mile after each run to turn around and I would take it slow to let some air flow over the aftercoolers.

[JRMSLINEA4]

that looks about 3.5 to 1. or at 7000rpm, the blower is turning 24,500 rpm. going a wee bit smaller on the upper blower pulley gets you to 4 to 1 pretty quick. The crank pulley can't go bigger or the belt will be to kinked. For the 1500 bucks I'd rather bolt 1 size bigger roots of the same type.
I meant putting a smaller pulley on the "snout" of the supercharger not the crankshaft pulley.

[NWS4Guy]

So now that you have th engine pulled, any change of a straight engine dyno? :D

[Keith@APR]

I thought my 4.87 was good?

[JRMSLINEA4]

I thought my 4.87 was good?Very good. Launching from 6k? [:p]

[L0U]

I thought my 4.87 was good?

definitely. It was the first one too.

[Keith@APR]

Very good. Launching from 6k? [:p]

Not needed on this car. Clutch slipped at 4200 anyways.[headbang]

I was launching around 3200-3400 with a feather. The 4.87 was with a little wheel slip up front, very nice.[evilsmile]

If I had a better clutch and put some air in the tires I feel a 4.6.

No matter what I did, it still bogged out of the hole.

[Keith@APR]

So now that you have th engine pulled, any change of a straight engine dyno? :D

I wish. They have to tear it down starting tomorrow if we are going to make the first race.

[NWS4Guy]

I wish. They have to tear it down starting tomorrow if we are going to make the first race.

Understood, it is a tight timeline - wishful thinking :)

[Arin@APR]

seems that the first run the i/c was cooler, and performance dropped as it got hotter and hotter(heated that i/c rad coolant). was the 4rth run made with a bit of an interval where things cooled a bit extra?

I ordered the output's on the graph from lowest to highest times. That's not the order he ran.

I think the order was 5.05, 5.15, 5.08 4.87. I'll check on my laptop later on.

[JRMSLINEA4]

Not needed on this car. Clutch slipped at 4200 anyways.[headbang]

I was launching around 3200-3400 with a feather. The 4.87 was with a little wheel slip up front, very nice.[evilsmile]

If I had a better clutch and put some air in the tires I feel a 4.6.

No matter what I did, it still bogged out of the hole.Yea more air would have helped with "less" bog. My last car was AWD and I had to play around with pressures when I took it to the dragstrip to get the best launch.

[S4Q8]

Great Build !!

When are we gonna see the APR mods ??

Do all the S4's have that Dent in the Mid-pipe ??

[Okan509]

Anyone notice the big blurr out in the last photo????

Whats that for? hahaha

[marty was here]

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5747.jpg

can i get this in original resolution, cause it made me LOL very hard. would be great for a background

[Arin@APR]

Yeah, I can crop up a nice 1920x1200 full resolution background later on. ;-)

Hmm, maybe I can make the race team work overtime by cleaning out the corner of the shop, setting the S4 in the corner and laying every part around it for a nice background photo. I'm sure they wouldn't mind! Hehehe :)

[Arin@APR]

Anyone notice the big blurr out in the last photo????

Whats that for? hahaha

Top secret 2013 prototype vehicle. We can't talk about it. ;)

[Okan509]

hahah ^^ interesting

[Wizard-of-OD]

http://www.goapr.com/news/wp-content/uploads/2009/10/MG_5815.jpg
I dont know why Audi/VW persists in using these plastic POS throttle bodies on boosted motors.These are PRONE to cracking yet they still manage to use them.[confused]

[leviathan18]

sammy so you can make an alu ones :P

[Cingulus]

Subscribe

[borutp]

http://www.audizine.com/gallery/data/500/MG_5747A.jpg


HEHEHE



.

[S-Fore]

Top secret 2013 prototype vehicle. We can't talk about it. ;)

Audi is doing a big reveal on 11/30 in SB. I'm curious what they are presenting to the world.

[Arin@APR]

B8 S4 Parts for Sale!

http://www.goapr.com/forsale/b8s4parts.php

[agkellyboy]

B8 S4 Parts for Sale!

http://www.goapr.com/forsale/b8s4parts.php

Insane. Any chance that steering wheel fits B7's?

[Arin@APR]

to be honest, I have no idea but if you want it, it's up for grabs! ;)

[Phantom S5]

What percent tint did you use on the car? I'm just wondering because it looks amazing and I'm going to be tinting my S4 soon.

[Arin@APR]

The darkest they had... it was tough to see out of the car and was only tinted because the car was not fully race prepped internally for the car show. I can't imagine tinting a car that much and still being able to drive it during the day, let alone the night.

[1_clean_Audi]

WOW you guys got balls! LOL

BTW are you gona sell the seats!!!?

[audib8nyc]

if your selling the front+back seats ill take em !

[Arin@APR]

Seats are for sale.

I'd like to sell it as a complete kit. IE all leather surfaces.
Front/Rear seats, Door cards, Center armrest, Side rear back leather scuff guards?

Pitch me an offer.

[reefer_bob]

w00t. Great thread.

[akasch]

dammit I wish I had the money to buy those seats!!

[leviathan18]

are you selling the headlight switch ?

[JMUCI]

Are you selling the shift knob and boot?

[Arin@APR]

are you selling the headlight switch ?

No. We'll probably need this item.




Are you selling the shift knob and boot?


So far no, but if that changes you have first dibs.

[GrnMtnS4]

Any more pics as you guys break down the engine? Great job - thanks for posting all the pics so far!

Brad

[Sharkfin]

Bumping to the top, more updates? This thing is sick

[Info@EuroCode]

http://www.goapr.com/race/

http://www.goapr.com/media/photos/72157623205728639/

[Arin@APR]

Fuel Cell Time!

http://www.goapr.com/news/wp-content/uploads/2010/02/MG_81521.jpg

http://www.goapr.com/news/wp-content/uploads/2010/02/MG_8162.jpg

[Mick4]

I see there's no sport diff on this vehicle, as a newbie - help me understand why this was left out for such a car? I am one of the few who ended up w/o this option (long story, and I'm punishing myself over it mentally even though I'm not terribly unhappy with the amount of understeer in my car) I'm considering some coilovers and sways because I would like less body roll.

[NWS4Guy]

I see there's no sport diff on this vehicle, as a newbie - help me understand why this was left out for such a car? I am one of the few who ended up w/o this option (long story, and I'm punishing myself over it mentally even though I'm not terribly unhappy with the amount of understeer in my car) I'm considering some coilovers and sways because I would like less body roll.

I'll let Keith or Arin speak on whatever detail they can to this, but they didn't get the car with one because they built their own super-secret one, which apparently does more than the stock one can, likely more track focused version if I had to guess. Someone asked about this on another thread of theirs and this was the basic answer.

[Mick4]

That makes more sense, thanks. Alright then...Keith, Arin, I'll take 1 Super-Secret Sport Diff please.

[Arin@APR]

Do you have $10,000 to $20,000 to spend? :)

[wwhan]

So how did you fill in the space where the sunroof was previously located? Are there any aftermarket
filler plates available to fill the space where the old sunroof was? Unfortunately the 2010/2011 S4 can
only be ordered with a sunroof.

How much does the sunroof assembly weight?

cool project car, by the way.

[NickS]

That makes more sense, thanks. Alright then...Keith, Arin, I'll take 1 Super-Secret Sport Diff please.

I'll take one as well. Do you have a lay-a-way plan? lol

[nick71692]

love the detail in this thread

[madmadS4]

http://lh6.ggpht.com/_C36J5jQvOdM/TIRLEHhVzOI/AAAAAAAAABE/-x0qp9PHJcM/s576/MG_5794.jpg

Could someone identify everything with a label on it?

[NWS4Guy]

http://lh6.ggpht.com/_C36J5jQvOdM/TIRLEHhVzOI/AAAAAAAAABE/-x0qp9PHJcM/s576/MG_5794.jpg

Could someone identify everything with a label on it?

Again? lol [;)]

A: Main crankshaft pulley
B: Power Steering servo pump pulley
C: A/C compressor pulley
D: Water pump pulley
E: Just a pulley to re-route the direction of the belt
F: Supercharger pulley
G: Alternator pulley
H: Tensioning pulley

Did you read the thread, there is a nice diagram of them all on page 2 along with an explaination of the coolant loop for the supercharger's air to liquid cooling.

[madmadS4]

yeah I'm still piecing it all together in my head.

does a racecar need an air conditioner? (guess it depends on the driver!) why not rip that out for one less parasite?

[NWS4Guy]

yeah I'm still piecing it all together in my head.

does a racecar need an air conditioner? (guess it depends on the driver!) why not rip that out for one less parasite?

This is the build thread, the car was painted up with it's racing setup for an unveiling before they ever got to the car. Read the entire thread, you will see this is where they took pics as they were removing the engine for the first time ever, parting out all the interior so they could gut it to loose weight and add the roll cage. The A/C was certainly removed, along with some other things like the stock exhaust from the headers all the way back, stock intake - gone, etc, etc.

[David@EuroCode]

Pics of the new car with progress please!

[NWS4Guy]

Pics of the new car with progress please!

Arin's last comment on an update request was something like "I can take a pic of it sitting out in the parking lot still looking stock if you want."

LOL

[GTSurgery]

I saw this car smashed when I got my car flashed today. Sad sad.

On another note, I got to see someone's (the boss?) car today with the some big ole brakes, intake, prototype pulley, and the new cooling system (didn't take pics and I'm not a car guy so I won't be of much help) being put on. Pretty sweet set up they have there, and I was very grateful they let me bring my car in for the flash with all the shows they have coming up.