Turbo problem?
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Imasmackyou

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Turbo problem?
« on: April 03, 2007, 12:33:13 PM »
Hi there!

I like this new forum!

Here is my problem. Lately, when I floor the car (wot) on any gear, car pulls beautifully at full boost(10psi). When I go to shift to a higher gear and proceed to floor it again quickly, boost stops at 1~2 psi struggles and after couple of seconds slowly starts and builds full boost again. This normally only happens when I shift in high rpms, does not matter what gear I'm in.(Could be 1st->2nd, 2nd->3rd, 3rd->4th or 4th->5th).
I already checked and made sure it’s not my diverter valve, besides I can hear it release the pressure when I'm shifting.
I checked for leaks, found none.
My wastegate opens  and closes smoothly when I push it manually, but have not tested it.
I'm not sure but I have a feeling that when the boost is struggling to build that my engine is running extra lean. Is that possible? If your engine is running extra lean will you struggle to build boost?

Could it be my turbo that is on its way out?

Hope you guys can give me some ideas to solve this problem.

Little more info:
turbo is a small pathetic t25 (so it's not a lag issue)
Fuel is controled using PCIII and 30lbs injectors (no RRFPR)
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asubimmer

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Turbo problem?
« Reply #1 on: April 03, 2007, 12:54:08 PM »
thats a small turbo and small injectors for 10psi.  If I were you I would be running 40-50lbs.  Do you have a wideband o2?
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Imasmackyou

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Turbo problem?
« Reply #2 on: April 03, 2007, 02:00:19 PM »
Unfortunately I don't have an AFR gauge or a wideband o2 sensor. I do go check them once or twice a year at my local performance shop. They normally do not deviate too much. They are roughly around 11~12.5 AFR under full boost. I try to keep them rich due to the inefficient small turbo and no timing control. As for my injectors beeing too small? maybe, but I was able to run 15 psi on them keeping similar AFR values (11~12.5) when I dropped my compression ratio to 8.5:1.
« Last Edit: April 03, 2007, 02:04:21 PM by Imasmackyou »
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1991 E30 M42

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Turbo problem?
« Reply #3 on: April 03, 2007, 05:24:35 PM »
Maybe it's your boost controller.
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