Avc-r Boost Issues

[Finchy33]

I recently had my car dyno'd for the new PFC and I also had the AVC-R tweaked. My turbo died since then and now have a S1 stock turbo on. It's a S2, so I don't know how they differ if at all.

Problem is it always over boosts by ~.1 kg/cm, no matter what the duty. I've resorted to setting the boost to .5 kg/cm2 to get a peak of .62 kg/cm2.

The previous setting was .75 kg/cm2 @ 82% duty which it held rock solid just slightly tapering off at the top end.

Any ideas? Nothing has changed but the turbo. It's getting frustrating, spent about an hour last night on the

freeway messing with it...

Edited February 18, 2008 by Finchy33

[Lithium]

Problem is it always over boosts by ~.1 kg/cm, no matter what the duty. I've resorted to setting the boost to .5 kg/cm2 to get a peak of .62 kg/cm2.

The previous setting was .75 kg/cm2 @ 82% duty which it held rock solid just slightly tapering off at the top end.

Any ideas? Nothing has changed but the turbo. It's getting frustrating, spent about an hour last night on the

freeway messing with it...

Hmm sounds interesting. I have just bought an AVC-R and haven't yet installed it so would be interested in hearing how this works out - I've just been reading the docs to get my head around what to expect etc.

Does it hold .1kg/cm2 flat more no matter what, or does it spike? So basically it just looks like its set up to run .6kg/cm or is it that it looks like its struggling to hold .5 but failing?

I can't remember, if you have RPM specific duty cycles set does that override the "blanket" duty cycle setting? I guess they are probably mutually exclusive. Also, is there any adjustment on the duty cycle for each gear or anything like that? I'm pretty sure mine is going to need a reasonable amount of tinkering beyond the basic "Set boost to xxxkg/cm and use xxx duty cycle to do so" to hold boost steadily.

[MR 33]

I had the same thing with mine before i pulled it off the road. First thing, check the reading against a separate boost gauge. Also check along your cooler pipes for any kind of leaks. Failing that, post up your duty and on what boost. Mine used to spike, then settle back to its setting after. Very frustrating. Mine used to spike like a monster to like 1.2bar, then i found out that my cooler pipe had been rubbing away on some metal to the point where there was a 2mm slit in it!

[Finchy33]

Good idea on the leak actually, that'd sort of make sense.

Basically as it stands, it's on .50 kg/cm² @ 36% duty. This results in .63 kg/cm² ± .02kg/cm². Depending on temp.

Should have just got a profecb

[MR 33]

Yeah could have a leak somewhere. To get my low boost of .75 i had to set at .5 with 52% duty. That was before i found the hole in cooler pipe though. Also, check to see if your self learn function is stuck on. This can alter your boost duty. Avc-r is a good unit providing everything is running right. On high boost i never had a problem before the hole, would hold 1 bar from 2.8k to 7.2k