upping boost...hesitation

Q&A regarding engines, turbos, and intercoolers and power upgrades

upping boost...hesitation

Postby scandinavian link » Mon Sep 27, 2004 4:38 am

ok, i had been having trouble with a mbc and upping the boost, so i switched to my brother's cuz i thought my boost controller was bad. well...it was...and it was a good bit better with his on.

however, if i gas it hard, it wants to hesitate. it will build boost but i can't feel it (like not even as much as i can feel less) this is only at like..9 psi or so. i'm guessing my one coupler may not tighten down well enough and leak slightly under higher boost or something, but it seems to do well enough(fine actually) if i build up slowly, instead of going full throttle quickly.

any ideas? thanks...
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Postby illGT4 » Mon Sep 27, 2004 4:58 am

perhaps timing is being pulled?
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Postby 935motorsports » Mon Sep 27, 2004 5:09 am

check your base timing

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Postby Griffin » Mon Sep 27, 2004 6:17 am

He may also be feeling the initial difference in having the wastegate closed - that does tend to make lag at lower RPMs.
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Postby alltracman78 » Mon Sep 27, 2004 11:51 am

How does having the wg closed create lag?

Yeah, it sounds like timing is being retarded.
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Postby Griffin » Mon Sep 27, 2004 4:00 pm

alltracman78 wrote:How does having the wg closed create lag?


It creates additional exhaust restriction before you spool so the performance before boost is a little flatter.

I think the timing is more likely, but wanted to toss that out as a possibility in case it isn't - its something I noticed when I shimmed my wastegate.
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Postby alltracman78 » Mon Sep 27, 2004 5:40 pm

But at that low of a flow, would it matter?
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Postby scandinavian link » Mon Sep 27, 2004 9:51 pm

umm, yeah, pretty sure timing was being pulled due to my complete retardedness.

realized today that my intercooler was basically bone dry. guessing that since intake temps were too high, my ecu did it's job and retarded my timing quite a bit. i'm glad the ecu is smarter than i am. and i'm glad i only drove about 4 minutes with the controller on (for about 30 seconds or less worth of boosting time)
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