2nd Generation Specific 1986-1992 Discussion

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Old 05-06-2004, 12:47 PM
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Hey guys, I have an 88 t2 with 64k miles. I bought a 3inch dp, gutted cat, 3inch cat back, k&n air filter. The car has the stock turbo and wg, here is my problem. The most boost I get is in 3 gear and it is 8 psi, 1st and 2ng gear 5 psi. I have tried putting an mcb in and no change, I took off the wg vacume line out and no difference. Any suggestions?

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Old 05-06-2004, 12:50 PM
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Isn't that normal on a stock t2 turbo?
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Old 05-06-2004, 01:19 PM
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every one of my friends, puts a free flow exhaust and it spikes to 10 or 12. with the wg line taking off the turbo should be boosting to its max and I dont think 8 psi is the max on the stocker.
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Old 05-06-2004, 01:45 PM
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Sorry I'm more of an internet database when it comes to TIIs, no real hands on experience ...



But according to This Post you should be getting about 7-8 close to stock.



I'm not sure how accurate that is, but anyways someone on here will give a better answer. Sorry I can't be of anymore help.
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Old 05-06-2004, 01:58 PM
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you r correct, 5 psi is stock boost level. but i am not compleatly stock, there are no real cats on the car (3 inch free flow exhaust) and cone filter. now the boost controler should alowme to boost over stock and that is where I am having the problem. I have gone to the point of taking the waste gate vacume line off, wich would translate into max boost on the turbo, but I am not getting anything more. BTW thanx you for you replys
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Old 05-06-2004, 06:26 PM
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Your ECU can trigger your twin scroll when it thinks there is a problem. It happend to me quite a few times. Mainly, it happend when I was at the track. I had a MBC set to 14 and it wouldnt boost more than 7.



This is my experience with this sort of problem. I would also check for a vac leak at a coupler, like on your turbo or intercooler.
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Old 05-07-2004, 11:57 AM
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Your ECU can trigger your twin scroll when it thinks there is a problem. It happend to me quite a few times. Mainly, it happend when I was at the track. I had a MBC set to 14 and it wouldnt boost more than 7.





Few questions.



How can you disable this twin scoll signal to the ecu?

You had this problem at 14 psi, did you have this problem at anything under that?





Thanx for the reply guys. I have also checked for vacume leaks on the turbo and intercooler.
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Old 05-07-2004, 11:10 PM
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Do you have a fuel cut defender yet?
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Old 05-08-2004, 12:34 PM
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Originally Posted by norbak1258' date='May 7 2004, 11:57 AM
Your ECU can trigger your twin scroll when it thinks there is a problem. It happend to me quite a few times. Mainly, it happend when I was at the track. I had a MBC set to 14 and it wouldnt boost more than 7.





Few questions.



How can you disable this twin scoll signal to the ecu?

You had this problem at 14 psi, did you have this problem at anything under that?





Thanx for the reply guys. I have also checked for vacume leaks on the turbo and intercooler.
I believe there is a vacuum soleniod under the intake manifolds in the rats nest that controls it. I just cut the arm out of the exhaust manifold.
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Old 05-08-2004, 03:10 PM
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You need a fuel-cut defender before you even want to be running more than that 8psi.



My brother and I ghetto-rigged me a boost controller using a valve that cuts flow through the lines between the compressor housing and the waste-gate. The less air you let through, you trick the wastegate into thinking it's not getting enough air, so it pushes more..more boost. We've got me running at about 9-10psi on my setup, and it's pretty f*cking quick.



Do you have an aftermarket boost gauge that is hooked up correctly?
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