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Old 12-29-2007, 12:31 PM   #11 (permalink)
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Default Re: Engine boosting, but lacks power...

Quote:
Originally Posted by John3000GTVR4 View Post
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.
No, it's not adjustable, unless you have some sort of standalone or piggy back system. But that's not your problem anyways, as it's been said allover here, you have a boost leak, it may even be at the BOV since you're hearing that noise.....

When you leak out the boost, the MAF has already regestered it. So it's calculated that you need x fuel and x timing retarded. But that's been leaked out, so you're running excessively RICH and retarding the hell out of your timing (not lean like previously said). It's going to make the turbo spool hella fast with no power (just like anit-lag), casue you really should hardly be seeing any boost when reving it, it needs that load to create it (unless you rap the hell outa it). The surging you feel is the injectors flooding your cylinders, it runs it so rich that it can't even light off the mix causing a mis-fire.....

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Old 12-29-2007, 12:59 PM   #12 (permalink)
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Default Re: Engine boosting, but lacks power...

Thanks for all the responses. We'll get to work on it again in a few days and I'll update you guys with the progress then.
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Old 12-30-2007, 07:23 PM   #13 (permalink)
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Default Re: Engine boosting, but lacks power...

Identical problem here. Idles awesome. Cruises fine, no startup issues, no codes (other than a knock sensor code). The hesitation is most noticeable with a cold engine and right after shifting and going back on the throttle again. No aftermarket boost guage, but the stock one goes all the way up to 14. I know that is not accurate, but nevertheless, this thing IS making boost pressure. Right as the guage reads positive pressure, this hiss develops, and yes, it is a tell-tale sign of a boost leak. The neighbor has a 3 legged dog that is faster than this car. No pressure tests, but I triple checked all the hose connections, and they're all good.
Captain obvious then put his mouth up to the BOV hose and blew into it with breath pressure. Its leaking through. Good chance this is the problem. Next spring, when it is warmer and half way comfortable to work on cars again, I will plug the blow off valve and then see what happens.
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Old 02-25-2013, 02:29 PM   #14 (permalink)
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Default Re: Engine boosting, but lacks power...

Been having a similar issue since tday, 3 months ago I got my 92 VR4 with only 48k, but a faulty ECM which I already replaced, car ran perfect since then. On friday I removed the original Y pipe that goes into the intake manifold and installed a metal one. Car ran awesome for the weekend no issues at all. When I started the car today and went out you could hear a pshhhhh sound and there was boost, but lack of power, the stock boost gauge will show boost built up to the max, however it didn't have power. Might it be a boost leak on the Y pipe I replaced?
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Old 02-25-2013, 03:46 PM   #15 (permalink)
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Default Re: Engine boosting, but lacks power...

If it's leak after the turbos then the air meter will read air entering the turbos and show this as "boost" on the stock gauge. It's not really boost but perceived load calculated by the engine ecu.. So you have a leak somewhere after the turbos, y pipe coupler is the first suspect, then recirc valve pipe?.
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Old 02-25-2013, 03:57 PM   #16 (permalink)
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Default Re: Engine boosting, but lacks power...

y pipe will be my best guess, as it is what i've replaced recently, it might've cracked as it looks made out of a very thin metal, that or any pipe that could've gotten unplugged.
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Old 02-26-2013, 02:36 AM   #17 (permalink)
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Default Re: Engine boosting, but lacks power...

I found on mine when I replaced to a metal y pipe, the one I got(a cheap one) had no lip on the bit that the bov hose attaches to and kept popping off until I got a decent t-bolt clamp
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Old 02-26-2013, 08:06 PM   #18 (permalink)
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Default Re: Engine boosting, but lacks power...

Just found out what the problem was, looks like the coupler between the y pipe and the throttle body popped out, will install it again with some sylicone or sealant so it won't pop again due to boost pressure.
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Old 02-27-2013, 07:44 AM   #19 (permalink)
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Default Re: Engine boosting, but lacks power...

Get a decent coupler and a pair of Mikalor clamps or it'll be forever popping off..
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Old 02-27-2013, 08:28 AM   #20 (permalink)
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Default Re: Engine boosting, but lacks power...

Thats because the stock plastic bov's are made to leak. It has a hole in it that lets a little air recirculate into the intake even when its not open. I'm not saying its not your problem just that its not air tight. Lol@ your friend for putting his mouth on that nasty hose.

Quote:
Originally Posted by phantomrt View Post
Identical problem here. Idles awesome. Cruises fine, no startup issues, no codes (other than a knock sensor code). The hesitation is most noticeable with a cold engine and right after shifting and going back on the throttle again. No aftermarket boost guage, but the stock one goes all the way up to 14. I know that is not accurate, but nevertheless, this thing IS making boost pressure. Right as the guage reads positive pressure, this hiss develops, and yes, it is a tell-tale sign of a boost leak. The neighbor has a 3 legged dog that is faster than this car. No pressure tests, but I triple checked all the hose connections, and they're all good.
Captain obvious then put his mouth up to the BOV hose and blew into it with breath pressure. Its leaking through. Good chance this is the problem. Next spring, when it is warmer and half way comfortable to work on cars again, I will plug the blow off valve and then see what happens.
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