How much power can i get out of a 4.2 V8 S5?

[8cylinders]

soon to purchase 07=08 s5, what mods can i do to increase performance and what sort of hp gain are we talking?

thank you!!

[S5Q7]

Supercharger. APR stage 3 gives you up to 537 hp. There are couple of guys here who have installed it...do a little search you'll find them

[8cylinders]

thanks for the reply man, not sure if i want to drop 14k on a supercharger what about tune exhaust etc? are we fairly limited?

[S5Q7]

It's a NA engine so I don't what rather than a S/C for a good gain in power. Exhaust, intakes will add up but not significantly IMO

[Alver]

There is no other way to increase power,tunes,exhaust ,you will notice no difference.supercharger will be night and day! If you cannot do the SC best to spend your money on suspension,lightweight wheels and good tires,that will make a difference. I have gone this route ,search the forums they all agree!

[Sgibb16]

Audizine stickers = 25 Horse Powahhhh

[bknewtype]

Audizine stickers = 25 Horse Powahhhh

+1

also, if you add any sort of kitty stickers, it will gain you an additional 18 whp

[Wah]

+1
also, if you add any sort of kitty stickers, it will gain you an additional 18 whp

According to the before/after dyno results, the kitty stickers added 12 whp. No doubt the bigger the kitty, the greater the gain.

[TGreene09]

According to the before/after dyno results, the kitty stickers added 12 whp. No doubt the bigger the kitty, the greater the gain.

My S5 broke the Dyno with all the kitty stickers.

[MDJ]

There is no other way to increase power,tunes,exhaust ,you will notice no difference.supercharger will be night and day! If you cannot do the SC best to spend your money on suspension,lightweight wheels and good tires,that will make a difference. I have gone this route ,search the forums they all agree!

I'm sorry, but really? You're saying a tune and exhaust yields no horsepower gains?
Suspension, wheels and trees make a difference in ONE department, while hp gains are quite different.

I don't own a 4.2, and wouldn't own one, but there are power gains to be had. Tune, long tube headers, exhaust, injectors and even nos are a few. Check out jhm's website.

[Mops@Nemesis]

If I had a 4.2 and was concerned with power I would put mine on diet and try and lighten the car up as much as possible. That will go farther than intake and exhaust.

[mxrz]

There is no other way to increase power

It's called a turbocharger and will decimate any supercharger setup. You just need balls to get it done because it isn't a simple bolt on, but has been done before on the 4.2L V8.

[bb vign]

I'm sorry, but really? You're saying a tune and exhaust yields no horsepower gains?
Suspension, wheels and trees make a difference in ONE department, while hp gains are quite different.

I don't own a 4.2, and wouldn't own one, but there are power gains to be had. Tune, long tube headers, exhaust, injectors and even nos are a few. Check out jhm's website.

I was an early adopter of a tune and exhaust and regardless of what the AWD dyno says, there is little real world difference in performance. Improved throttle response and a smoother powerband but that is it. Exhaust is done more for sound than power on these cars. The unfortunate reality is that a 20-ish HP gain in a 3,800+ pound car is essentially a rounding error.

As respects JHM, I didn't think their B6/B7 4.2L V-8 mods (especially the headers) fit the B8 S5.

[majeedshinkar]

soon to purchase 07=08 s5, what mods can i do to increase performance and what sort of hp gain are we talking?

thank you!!

I was also hoping to find a reasonable mod/gains, other than the Apr stage 3. I still decided to go all apr i had the rsc exhaust installed first, which by far was the best exhaust note for me, no drone in cabin at all (for auto). Apr claims that exhaust adds 17hp which to be honest u might slightly feel, then i had the apr ecu upgrade last night, also minimal gains but more responsive acceleration. Im waiting for the carbonio intake. An Apr specialist told me that with all three mods 17hp + 15hp + 7hp should get me near the 400hp..if not a little less. I say go for APR

[mxrz]

An Apr specialist told me that with all three mods 17hp + 15hp + 7hp should get me near the 400hp

Almost 40hp extra huh, you will be disappointed if you actually dyno the car after those mods.

[majeedshinkar]

Almost 40hp extra huh, you will be disappointed if you actually dyno the car after those mods.

Which i dont believe. Exhaust might give 10hp if not less, not 17hp as apr states in their dyno test. Ecu, im honestly trying to feel the gain, other than responsivness.

[bknewtype]

Wasnt the "feel" of a fast car moot as stated in another thread? :D


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[AofC_RR]

Carbon clean, intake, exhaust would be your best bets. At least the car will breath better and you'll pick up a couple HP on the old butt dyno. Other than that start saving your pennies for a supercharger. A tune is a waste of money on a NA car.

[MDJ]

As respects JHM, I didn't think their B6/B7 4.2L V-8 mods (especially the headers) fit the B8 S5.

That's understandable. I suppose I'm speaking more from experience with B6 S4 modifications than anything.

Not to toot my own horn, but this is why I chose the 2.7tt. While a B5's cosmetic appeal is admittedly less appealing than the S5, I'll take my 475whp and 20 mpg over the 4.2 range of potential any day.

With time, I'm sure some worthwhile mods will surface.

[Mops@Nemesis]

Def heard a toot or two;)

[FaceSmA5h]

That's understandable. I suppose I'm speaking more from experience with B6 S4 modifications than anything.

Not to toot my own horn, but this is why I chose the 2.7tt. While a B5's cosmetic appeal is admittedly less appealing than the S5, I'll take my 475whp and 20 mpg over the 4.2 range of potential any day.

With time, I'm sure some worthwhile mods will surface.

I heard with the S5, it has a rate of 100 panty drops per minute. Who needs speed when girls and kitties are throwing themselves at you?

[tozer]

No stroker kits or performance cams available for this engine?

[bloodstar57]

No stroker kits or performance cams available for this engine?

It would be more than the supercharger!

[JimmyBones]

As respects JHM, I didn't think their B6/B7 4.2L V-8 mods (especially the headers) fit the B8 S5.

They actually have headers and a clutch kit with a light weight flywheel for the S5s. Here is a thread from a while ago that they did on AudiRevolution.net.

http://audirevolution.net/forum/index.php?topic=129.0

[Wah]

with all three mods 17hp + 15hp + 7hp should get me near the 400hp..

You cannot simply add these numbers for a total hp number. It doesn't work like that unfortunately.

[MDJ]

I heard with the S5, it has a rate of 100 panty drops per minute. Who needs speed when girls and kitties are throwing themselves at you?

I Sir, am spoken for. I'm left with nothing but speed!

[TheDapperDriver]

as said before only thing you will really get power from is the supercharger
I have an exhaust, downpipe, intake, and tune on the car and it only gets 270-ish on the wheels on the dyno
best thing to do is install a rear sway bar, a drivetrain stabilizer and you will enjoy the car more

[Cuppa]

a drivetrain stabilizer

OP shown as from New Zealand - they drive on the left like us (so assume it's a RHD car unless imported). Don't believe there is a drive train stabilizer for RHD. If there is point me at it and I'll go buy it.

[TheDapperDriver]

OP shown as from New Zealand - they drive on the left like us (so assume it's a RHD car unless imported). Don't believe there is a drive train stabilizer for RHD. If there is point me at it and I'll go buy it.

hm..... doesn't it fit for both cars?
have you asked any vendor if they it works on RHD models? or if they will make/modify one to fit your car?

[Cuppa]

hm..... doesn't it fit for both cars?
have you asked any vendor if they it works on RHD models? or if they will make/modify one to fit your car?

If you mean the Alu-Kreuz, then no, it doesn't fit RHD:

http://www.audizine.com/forum/showth...=1#post6713285
http://www.audizine.com/forum/showth...=1#post8169007

Over on A5OC we're investigating getting one made up in the UK for the B8/8.5 platform as there would be plenty of interest I am sure.

[TheDapperDriver]

If you mean the Alu-Kreuz, then no, it doesn't fit RHD:

http://www.audizine.com/forum/showth...=1#post6713285
http://www.audizine.com/forum/showth...=1#post8169007

Over on A5OC we're investigating getting one made up in the UK for the B8/8.5 platform as there would be plenty of interest I am sure.

get a group buy and contact a vendor

[JappleS]

Simply put, the V8 needs forced induction to get any real power gains. Spending money on intake/exhaust will do more for the sound of the car than the performance. Sad but true. If you really want more power, you'll have to spend the money on a supercharger or a turbo.

[tadhgbrosnan]

I was also hoping to find a reasonable mod/gains, other than the Apr stage 3. I still decided to go all apr i had the rsc exhaust installed first, which by far was the best exhaust note for me, no drone in cabin at all (for auto). Apr claims that exhaust adds 17hp which to be honest u might slightly feel, then i had the apr ecu upgrade last night, also minimal gains but more responsive acceleration. Im waiting for the carbonio intake. An Apr specialist told me that with all three mods 17hp + 15hp + 7hp should get me near the 400hp..if not a little less. I say go for APR

Your car is NOT going to be near 400hp. Simple as that. You've improved the sound (alot) but little else. Your car is NOT any faster than before. This is fact.

[JimmyBones]

Simply put, the V8 needs forced induction to get any real power gains. Spending money on intake/exhaust will do more for the sound of the car than the performance. Sad but true. If you really want more power, you'll have to spend the money on a supercharger or a turbo.

You guys need to educate yourselves. The RS4s (which are NA) go a hell of a lot faster with piggy pipes, exhaust, and lightweight parts.

Just like the rest of the B8s, the S5s suffer from shitty catalytic converters. Not only do they have horrible bends but the cats don't flow very well causing a lot of heat to stay close to the engine which hurts timing and other things. Headers or 034 Motorsport downpipes would help a lot along with a good 2.5 inch exhaust. The formula for power with the B8 S5s is really not that different than the B6/7 S4s.

NA is not dead! Just go look at the RS5 which lays the smack down on a bunch of other cars.

[mxrz]

You guys need to educate yourselves.

Says the guy who talks about three different 4.2 V8's like they were the same... Who cares what the RS5 can do, that V8 has exactly two things in common with the S5 V8; displacement and number of cylinders, same applies to the RS4 V8. To bring "our" V8s to that same level of performance, would cost almost as much as the supercharger, and more to get the maximum out of it, which is still less than what the supercharger, a simple bolt on, gives you, and FAR less than what a custom turbo kit would provide. The point made was valid, the "only" way to get "significant" power increase is forced induction. Cats, downpipes and headers are a given, and they work that much better with boosted/blown motors.

You just have a different opinion, and for some reason think that 30~50hp is a real power gain. It isn't, it's peanuts, turbo four bangers get that from a simple $600 ecu flash.

[JappleS]

You guys need to educate yourselves. The RS4s (which are NA) go a hell of a lot faster with piggy pipes, exhaust, and lightweight parts.

Just like the rest of the B8s, the S5s suffer from shitty catalytic converters. Not only do they have horrible bends but the cats don't flow very well causing a lot of heat to stay close to the engine which hurts timing and other things. Headers or 034 Motorsport downpipes would help a lot along with a good 2.5 inch exhaust. The formula for power with the B8 S5s is really not that different than the B6/7 S4s.

NA is not dead! Just go look at the RS5 which lays the smack down on a bunch of other cars.

You need to educate yourself. Tell me what kind of power gains you think the V8 S5 engine will see with intake/exhaust mods.

[GSS5]

i don't think we've yet seen a v8 s5 with header/cat mods. makes me wonder what kind of gains there are to be had.

[Bigserve134]

You guys need to educate yourselves. The RS4s (which are NA) go a hell of a lot faster with piggy pipes, exhaust, and lightweight parts.

Just like the rest of the B8s, the S5s suffer from shitty catalytic converters. Not only do they have horrible bends but the cats don't flow very well causing a lot of heat to stay close to the engine which hurts timing and other things. Headers or 034 Motorsport downpipes would help a lot along with a good 2.5 inch exhaust. The formula for power with the B8 S5s is really not that different than the B6/7 S4s.

NA is not dead! Just go look at the RS5 which lays the smack down on a bunch of other cars.

+1, he knows his shit. Dont argue with Jimmy .

[mmmham]

+1, he knows his shit. Dont argue with Jimmy .

Then where are these mods? Serious question I want to know.

[NavajoS5]

I heard with the S5, it has a rate of 100 panty drops per minute. Who needs speed when girls and kitties are throwing themselves at you?

agreed got mine friday and my next weekend is booked!