I need assistance. I have a 2004 S4, and I want to start making some modifications, but I am looking at the Forced Induction kind. I have searched everywhere and I cannot find a company that works on the New V8 S4 for FI. I know that this car has a HUGE amount of potential, I mean the car puts out 344 HP, but I look under the car, and the damn thing has 4 cats on it!?!?!?!? Plus it has a crappy air box system on it. I beleive that if I kept it NA, I would be able to get close to 100HP per liter. But since it has a 10:1 comp. I want to get a low boost FI setup on it. If anyone has ideas, shoot them my way

 

where the hell would you put a turbo or SC on that engine? it looks like it got shoehorned in there as it is..... is there room?

 

what about using the turbo setup from the rs6...its good for 450 hp stock..if i am correct, its the same engine..and then there would be potential to mod that after the two turbos are on...

 

The space is very tight. A supercharger would need to be of the screw nature, and be on top of the engine, with an obvious hood change. The turbo kit from the RS6 will not fit in the engine bay. I did manage to find out that there are people out there that have attained 100 HP per liter NA with this engine. After all, it does have 40 valves, and it has a high redline for a V8. I will say this though, this enging is almost as rev-happy as the S2000, all things considered. I will say the RPM "climb" is astonishing.

 

not enough room in engine bay. I dont think any FI will fit without MAJOR modification.

I would say stay in NA
Good intake,header,exhaust,chip should give decent hp!

 

Using this forum is mental, but there is a lot of information there, I've seen posts where people have went FI on thier S8's it may be a good start

http://forums.audiworld.com/a8/

 

S8 has plenty of engine room..

Engine room in new S4(b6) was very tight that Audi had to put chain timing belt to rear of the engine to fit under B6 engine room.

Also member of Audiworld.com here
owned two A4s

 

A screw setup would go on top of the engine, and the only mod that I would see is a hood with a cowl setup? Not too major. My plan is to change the exhaust on the cat-back portion, and the intake, plus have two removable straight pipes, to cancel 2 of the cats on it. These mods bring me about 42 wheel HP on this car. That just shows the amount of airflow restrictions on it. Also, I have already given the car a 72 pound diet, and plan on changing rims and tires, which will save me another 70 pounds or so.

 

If you wanted to mod a car the B6 S4 is not one to play with. I've learned my lesson, modding German cars is too much money for too little performance gains, and you are talking to a guy who has had a B5 S4.

Sam

 

Do you think you could get a belt down to something to drive a screw type SC? It has got to be TIGHT at the back of that engine bay.

I have a 3.0 and I can just imagine what it would be like in there with an additional two cyclinders.

NS2000X