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Old December 26th, 2003, 10:06 AM   #1
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S4 supercharger?

Is it possible to supercharge an s4? Does anyone know of any availible or would it be a DIY? My bro has a 2000 s4 with a lot already done to it(30K) and he really wants to supercharge it to make up for turbo lag. I have seen some lambos with dual turbos and dual superchargers and I thought that was sweet. Money is not an object. All input is greatly appreciated!!!
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Old December 26th, 2003, 11:54 AM   #2
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Well if money isn't an object then anything is possible . I am guessing it would have to be all done as a custom job.

And who's S4 is it?



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Old December 26th, 2003, 12:28 PM   #3
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old s4 can for sure...but the new one i dunno because its big 8
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Old December 26th, 2003, 01:48 PM   #4
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its my brothers s4. its a 2000 with the 2.7T engine. He already upgraded to the rs4 turbos and rs4 intercoolers and did a bunch of other stuff(in another post somewhere). He wants to get to around 600whp and i thought this was another step he could take without adding nos. he is pushing somewhere around 450 - 470 whp right now and he says its not enough(i wish i had that problem). Any ways we drove it to vegas for sema and its incredible. Thanks again guys!
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Old January 4th, 2004, 06:27 PM   #5
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Yeah, I'd check with people who do VW work. They're pretty much the same cars (and engines), so a good VW tuner should be able to help.
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Old January 4th, 2004, 06:54 PM   #6
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The best way to combat lag on larger laggier higher peak horsepower turbos is with nitrous. Adding an S/C is probably just going to add a lot of parasitics and make the peak horsepower goal even more difficult to reach.
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Old February 9th, 2004, 10:02 AM   #7
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weird....how do put an SC on a car that already has 2 turbos?
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Old February 9th, 2004, 10:42 AM   #8
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it would be a weird application with the dual turbos and almost impossible to fabricate something that could feed the air from the subercharger into each bank of turbos.
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Old February 10th, 2004, 08:00 AM   #9
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yeah, but if you are going to try for really high hp, you probably would be swapping out the twin turbos for one large one with a much higher pressure rating. That's how the Supra's tend to work, for example.
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Old February 10th, 2004, 02:28 PM   #10
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hmmm seeing your need for a high-hp application, i'd say do a sequential twin turbo setup. one big one, one smaller one. *PSSSSSSSSSSHHH*
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Old February 10th, 2004, 02:34 PM   #11
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hmmm seeing your need for a high-hp application, i'd say do a sequential twin turbo setup. one big one, one smaller one. *PSSSSSSSSSSHHH*
that makes more sense rather than a large single turbo application.....the smaller turbo spools up quicker to deliver boost down low....where an AWD (because of weight) would benefit fro it most

...remeber the concept behind the S4 was that 2 small turbos spool up quicker and create boost more efficiently than a large single turbo (parasitic lag)
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Old February 10th, 2004, 03:20 PM   #12
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Actually, depending on how the car will be driven, an AWD can beneift from a single large turbo, since it can start from a much higher rev level than a RWD. If the ambition is just to go fast in a straight line there is no real reason for an AWD to worry about low end power, since it will never see less than 4000 RPM's.

Now, if the goal is a real sports car (one than can turn...), one tends to want a slightly more even power distribution. It is possible to carry high RPM's through turns, but not as high as would be prefereable for a single high boost turbo.

Like I said, it's a function of the final goal for the car. S4's, like BMW M3's, are designed for general highspeed driving, tracks, and the like. A 600hp+ car is more often in tended as really more of a drag-race type vehicle (0-60, 0-100, 1/4 mile, etc), so I figured the ambition was just more top end power..
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Old February 11th, 2004, 03:53 PM   #13
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hey not to get OT, but is it possible to swap the euro E36 M3 motor into the E34 w/ an M50?
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Old February 11th, 2004, 07:13 PM   #14
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What year and model of E34? Irregardless it would be possible, but probably not desirable. The Euro M3 motor is alright, but it would have to be the 92-95 (OBD 1) 3.0l, and that's really not worth it. The 540's engine is actually a more capable design if one really wants to get power (same HP, more torque). For that matter, I have almost the same performance out of my US spec motor (except for slower throttle response due to the lack of independant throttle bodies).

The one good thing is that BMW engine swaps (at least for OBD 1) are actually quite easy, although a transmission change may also be in order.

If you are interested in talking more about this, let me know, and I'll set up a different thread.

Oh, nice Bun-Bun...
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