Acceleration Issues With R33

[master_illusion]

Hi,

I have had a bit of a search but to no avail.

I have just had a new motor put into my 1994 R33, and the problem is that after about 1/2 throttle, there doesn't seem to be anymore poke from the motor. It just keeps accelerating as if it was still 1/2 way down.

It still sounds like its boosting but it just accelerates really slowly.

The motor is still on very low boost, but doesn't get over about 3 psi. As long as you keep the throttle below 1/2 it seems to pick up okay. But still doesn't boost over 3psi.

Any idea's??

Regards

Master_illusion

Edited July 25, 2006 by master_illusion

[RANDY]

So... if you rev the thing in neutral, does the motor spin up with the foot all the way in? If it does, then your TPS and throttle cable is OK.

Does it idle OK? If it does, then you might not have a boost leak. Still, some leaks open up under pressure, so recheck and retighten everything.

If those are fine, i'd start looking at your boost actuator, check that there are no blockages, and that it's plumbed up correctly to the intake pipe and wastegate actuator. EDIT: If it was blocked or not working, I think you'd get the factory 7psi or whatever the wastegate is rated for... so maybe just bypass the controller just to test. (keep an eye on boost, don't overdo it)

Then, maybe check, that your BOV or wastegate isn't stuck open or something.

It rather sounds like the turbo isn't generating more than 3psi... i'm sure it would be sluggish at 3. Whether it's because of any of the above possibilities, I dunno. Check them out, one by one...

Edited July 25, 2006 by RANDY

[mad082]

could be that the turbo is cactus. if it has been thrashed the exhaust wheel might be damaged which would explain why it isn't boosting.

as has been said check the wastegate isn't sticking open, check that the bov isn't stuck open, if you have a boost controller on it take it off and just run the hose straight to the actautor. sometimes the controllers get blocked and don't release the air between it and the actuator so the wastegate stays open.

[master_illusion]

There is no boost controller attached. It did have one but they have removed that while the motor is running in. Also the bov, has had a plate put over it so it passed the requirements. I have just brought this car. Could it be to do with the fuel filter, I have still not checked that, but could that also affect the overall total boost, as it is in relation to the acceleration problems??