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Old 12-28-2007, 03:56 PM   #1 (permalink)
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Default Engine boosting, but lacks power...

Car starts normally, idles fine. We've rev'd it up many times and it's smooth and sounds really good. Oil pressure is good, compression test on all cylinders is around 120 (has shown higher before). Boost pressure can reach about 3-5psi when rev'd up. Under load boost gauge reads higher than 5, but car does not seem to actually perform at that level of boost (seems sluggish). During acceleration we experience jerking, and followed by each jerking action we hear a PSHHHH, and then what also sounds like a sucking in of air. The rear exhaust manifold at the turbo gets excessively hot. We have seen it glow when nothing else has. The engine was just put back together because I had most of the gaskets and seals replaced. New clutch and flywheel aswell. New output shaft and transfer case sleeve too. Clutch and transmission feel fine. Car sounds very good. The only problem is this strange hesitation and the sound of air shooting out of some place and even what sounds like air sucking in... It just sounds like the car is almost hiccupping whenever it boosts. I will be checking rear manifold and turbo housing this week to see if the problem may lie there. Any insight into this issue will be much appreciated.

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Old 12-28-2007, 04:00 PM   #2 (permalink)
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Default Re: Engine boosting, but lacks power...

what are u using to read boost levels?
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Old 12-28-2007, 04:09 PM   #3 (permalink)
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Default Re: Engine boosting, but lacks power...

Check for boost leaks, and if you have a logger, log and then post it.
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Old 12-28-2007, 04:34 PM   #4 (permalink)
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Default Re: Engine boosting, but lacks power...

To read boost levels, a mechanical autometer boost gauge.

No, I actually do not have a logger. Can somebody show me all the things I need to buy to log data? If you can give me some links to affordable loggers, I'll go buy what I need and finally get it set up. I should have done this already, but i guess now is a good time
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Old 12-28-2007, 04:42 PM   #5 (permalink)
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Default Re: Engine boosting, but lacks power...

the 93 logger is obd1 i beleive and therefore pretty cheap. Contact shiver, he can hook you up. I think it would be about $100 with the pda.
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Old 12-28-2007, 04:46 PM   #6 (permalink)
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Default Re: Engine boosting, but lacks power...

pressure test. Sounds like you have a large boost leak.
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Old 12-28-2007, 06:01 PM   #7 (permalink)
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Default Re: Engine boosting, but lacks power...

Quote:
Originally Posted by silky View Post
the 93 logger is obd1 i beleive and therefore pretty cheap. Contact shiver, he can hook you up. I think it would be about $100 with the pda.
+1
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Old 12-29-2007, 06:43 AM   #8 (permalink)
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Default Re: Engine boosting, but lacks power...

Glowing mainifold can indicate your running lean due to a major air leak after the mas, best bet is to check all the pipework and do a pressure test (as has been said already). Wrong Ignition and valve/cam timing can also produce a glowing manifold.
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Old 12-29-2007, 11:50 AM   #9 (permalink)
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Default Re: Engine boosting, but lacks power...

On the 2-bolt main twin turbo engine, the cam angle sensor can be adjusted to advance or retard timing. How is it done on the 4 bolt twin turbo engine? My friend says it's not adjusted the same way as on the 91-92 enignes, which is what he has experience working on.

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Old 12-29-2007, 12:01 PM   #10 (permalink)
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Default Re: Engine boosting, but lacks power...

Sounds like a pretty nasty boost leak to me.

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