No boost need help please

[87bluenational]

Here it is i have a 87 grand national, last year i had a stock turbo and stock injectors,with a 93 chip from poston. A 3 inch maf pipe and a 9 inch k@N air filter. I went to the track with slicks and a bad rear end and i could only get the boost up to 7lbs and ran at best 14:50. So this off season we put a newer rear end in, took the stock turbo off and found that it had shaft play and real bad fins. So I figured its out with old and in with the new. I purchased a rebuilt pt6376 and figured lets get 60lbs injectors and headers from poston(using the old crossover pipe) rebuilt transmission with a 2200 torque converter. A turbo tweak chip from Eric. So now i have the same problem but worse. Boost is only going up to one when break torque. And only 7 maybe 8 when shifting from 1st to 2nd. I have not had it to the track yet and can not get anywhere longer enough to let it go through all 4 gears. We did some tests, one was if the waste gate was working and put new vacuum hoses on drained the intercooler just incase any oil was in there. I need help. I do believe that this turbo should get at least 15-17lbs of boost on take of and 1 is a for cry. Any help will be greatly appreciated.

 

[vader87]

Are you still running a factory elbow in your downpipe? If so the puck maybe to small and exhaust is getting around the puck, keeping you from building boost.

 

[TurboDave]

Here it is i have a 87 grand national, last year i had a stock turbo and stock injectors,with a 93 chip from poston. A 3 inch maf pipe and a 9 inch k@N air filter. I went to the track with slicks and a bad rear end and i could only get the boost up to 7lbs and ran at best 14:50. So this off season we put a newer rear end in, took the stock turbo off and found that it had shaft play and real bad fins. So I figured its out with old and in with the new. I purchased a rebuilt pt6376 and figured lets get 60lbs injectors and headers from poston(using the old crossover pipe) rebuilt transmission with a 2200 torque converter. A turbo tweak chip from Eric. So now i have the same problem but worse. Boost is only going up to one when break torque. And only 7 maybe 8 when shifting from 1st to 2nd. I have not had it to the track yet and can not get anywhere longer enough to let it go through all 4 gears. We did some tests, one was if the waste gate was working and put new vacuum hoses on drained the intercooler just incase any oil was in there. I need help. I do believe that this turbo should get at least 15-17lbs of boost on take of and 1 is a for cry. Any help will be greatly appreciated.

With a 2200 torque converter behind a PT63, that explains why it probably seems to take forever to build boost, even after launch.
If you stay in it through 3rd gear does the boost get up to at least 15? What type of wastegate actuator did you get with the new turbo?

 

[BoostKing]

Bump

 

[87bluenational]

yes i am running a stock elbow with the down pipe that came with the car. I can't be sure that it is the stock down pipe though. And i have not had a chance to get it into third gear. And the boost seems to go down a little after the shift from 1st to 2nd instead of climbing like i think it is suppose to do. Please keep seeding the tips. The only thing about the torque converter is i would hate to put a bigger one in and still have the same problem with the boost not going over 1 to even 5lbs. Keep all the tips and anything that you think can help coming. I greatly appreciate it.

 

[jhanson1750]

Have you tightened the wastegate rod?

 

[87bluenational]

Yes i have as tight as it would go. I also bought a rcj gasket and when i put it on it did not line up exactly and burned it right up. So now i just have the stock elbow bolted right up to the turbo with some high temp sealer. If i have a small exhaust leak from were the hearders bolt up to the crossover pipe, would that not allow the turbo to build up but I still get boost after i take off? Any hints and tips just keep them coming!!!

 

[TurboBuRick]

The wastegate puck is not sealing or you have a leak between the turbo and the intake. Check all couplings to make sure nothing blew off.
One other thing would be the y fitting for the wastegate. Make sure its installed right.

 

[87bluenational]

Hey Rick how is it going. As you can see i haven't had a chance to fully enjoy your toy you sold me. It's been fustrating. But hanging in there. I will check all fittings and couplings to make sure nothing blew off that i missed. Also will check the puck to make sure it's flush and the y fitting. I may have to upgrade the torque converter and go to a aftermarket downpipe. But that all cost $$$ and it will have to wait for now. Thanks for all the tips if anything else that anyone thinks of just post and i will read it. Thanks again

 

[TurboBuRick]

The next things to take a look at would be a restricted exhaust or even worse, a flat cam.

 

[Boost231]

wow a 2200 stall with that turbo. theres your problem right there. you need a converter.