Safe amount of boost to run on an S4

Post by **BRETTCOLLINS** » Tue Mar 29, 2005 2:24 pm

can anyone tell me what a safe amount of boost would be on an S4 with K04 turbo's.

Post by **KayGee** » Tue Mar 29, 2005 9:50 pm

Million dollar question.

1.3-1.2 seems fairly usual on an S4 (APR, MTM kits). However finding data is really hard. Very few dyno plots show boost against RPM. What does your AMD chip do?

I think the RS4 runs around 1.2-1.0 bar, it actually runs more boost higher up unlike the S4 which tapers off. Not sure what the chipped RS4s run. Hopefully someone from RS4 board will join in.

Post by **BRETTCOLLINS** » Wed Mar 30, 2005 8:09 am

Have been told that my car has been set on 20 PSI, but this seems a bit high to me. what do people think.

(20 PSI is 1.379 BAR ) I think

Post by **Mik** » Wed Mar 30, 2005 9:23 am

Brett

How much power are you getting from your remap with such a level of boost?

Mik

Post by **KayGee** » Wed Mar 30, 2005 10:03 am

Doesn't sound OTT, if a RS4 runs 1.2 in std trim. Suspect that chipped RS4s run 1.4, I believe Verrukt runs 1.5 on his S4, although he has hybrids and flowed heads and cams.

Got any VAG com (003, 115) logs or Dyno runs?

Post by **KayGee** » Wed Mar 30, 2005 10:23 am

Just realised in a couple of weeks our cars will be twins. Your K04 setup will be almost the same as mine. I'm having the RS4 oil cooler as well.

Post by **BRETTCOLLINS** » Wed Mar 30, 2005 12:07 pm

the car running 413.8bhp with 438.5 torque

Post by **dazzer** » Wed Mar 30, 2005 12:23 pm

I believe NASA are good with rocket ships.....

Post by **Dippy** » Wed Mar 30, 2005 12:44 pm

If you guys don't have a boost gauge then I am amazed. I only have mild tuning compared to you and I wouldn't be without it.

1.4 bar is perfectly fine for K04s (as long as you have your APR bipipe!).

Post by **BRETTCOLLINS** » Wed Mar 30, 2005 5:50 pm

Do have a boost gauge and APR bi-pipe, Goes to 20psi on launch then backs off to about 16 PSI I think.

Post by **Dippy** » Thu Mar 31, 2005 2:12 pm

Get a metric one then

That's the same as mine, so I suggest your map is conservative.

Post by **BRETTCOLLINS** » Thu Mar 31, 2005 3:51 pm

Yes but 600 easy miles later and only kicked four times the engine blow up. not happy

Post by **jeffw** » Thu Mar 31, 2005 4:00 pm

the car running 413.8bhp with 438.5 torque

One who's Dyno ?

Out of interest what was your Wheel Horse Power and losses ?

Post by **KayGee** » Thu Mar 31, 2005 5:20 pm

Do you know what happened to the engine yet? First S4 I have heard off that expired.

Post by **BRETTCOLLINS** » Fri Apr 01, 2005 7:28 am

Not yet, But piston 6 with shot, no compression with 96% pressure loss.

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Safe amount of boost to run on an S4

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