Stock boost is?

2000S4 · #1 07-12-2007, 01:32 PM

What is stock boost on the B5 S4? PSI wise

Brandon2000s4 · #2 07-12-2007, 01:40 PM

Mine is around 12.2 psi stock.

SilverAudiS4 · #3 07-12-2007, 06:06 PM

What is the maximum boost these motors can run with stock fuel?

2k S4 · #4 07-12-2007, 08:35 PM

Stock is 10psi.

With the K03's it's not fuel but the turbo's that give up. You don't really get any more CFM pushing them at much over 19psi.

Stuckeyman87 · #5 07-13-2007, 02:32 AM

the apr 93 octane chip runs 14.5 psi and the giac chip runs 17 psi, correct?

SilverAudiS4 · #6 07-13-2007, 07:16 AM

Side question? How many wastgates are on these cars? Is it just one for each turbo? Or is there a third that is making sure there is not too much boost coming from the two combined turbos?

GeilKyle2 · #7 07-13-2007, 12:30 PM

There is 2 wastegates, one for each turbo

SilverAudiS4 · #8 07-13-2007, 03:07 PM

So if stock psi is 10 then each one is set at? 5? Is there anyway to change this on the wastegate without a boost controler?

2k S4 · #9 07-13-2007, 10:28 PM

Quote:

ORIGINAL: SilverAudiS4
So if stock psi is 10 then each one is set at? 5? Is there anyway to change this on the wastegate without a boost controler?

It doesn't add up, they both put out the same PSI. The reason for 2 is to increase CFM.

No matter what you do, the N75 will cut the boost to what the ECU request.

SilverAudiS4 · #10 07-14-2007, 01:16 AM

oh okay, that makes sense, i figured it just added up from both turbos. is there anyway to trick the car to add more boost? or would that require a fuel controler as well...?


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