Hits 15psi,and then boost shoots to 0.Not happening w/ dump off..

[marleyskater420]

Ill have the wastegate tightened, and the car will spool like a dog on my TE45 w/ my 3200 l/u. It will reach 15psi slowly, and then fall down to 10psi, and then hold,and the car feels like the power just got cut in half. Sometimes it even shot down to 0 and the car just didnt spool the turbo. I could hear it leaking under the hood, but I dont know what and where. All the intercooler hoses are tightened, so I dont know.

The wierd part is, a day ago it would hold steady at 14-15psi, and now I tightened it 3psi on the rod,(3 full turns) and it wont work at all.

When I take the dump off,the turbo spools SO QUICK and holds there, and doesnt falloff at all. I cant floor it w/ the dump off cuz the boost soars too high.

whats wrong here?

 

[Russ Merritt]

Why would you run a TE45 turbo, a TH 3" DP and hook it up to a stock exhaust sytem?????????????????????????


Please explain.....

 

[marleyskater420]

Originally posted by Russ Merritt
Why would you run a TE45 turbo, a TH 3" DP and hook it up to a stock exhaust sytem?????????????????????????


Please explain.....

its called money. care to help and not tell me why i need more money.

 

[Russ Merritt]

Yea, rip your exhaust off! Drive around without one till you get the money............... Your car will love you. Your car has been telling you what it wants, your not listening........


Did the car come like that? You didn't buy that big turbo and DP and hope they would work, did ya?

 

[turbo2nr]

Re-check your turbo's bolts. Something is leaking (pre-turbo exaust), or you have switched around your vacume lines to your wastegate. Don't listen to those guys. I have the stock exaust, and I'm almost in the 10s, just waiting for the weather. I use washers to open the exaust between the converter and tail section, or just unbolt the cat. all together. Then I have the option of returning to a very quiet, and fast ride. Exaust is expensive, and you really do not need it. Most tracks will allow turbo cars to run without mufflers. Opening the DP/cat area is free, and works as good as any $700 exaust system.

I think you are on the right track.

 

[marleyskater420]

Originally posted by turbo2nr
Re-check your turbo's bolts. Something is leaking (pre-turbo exaust), or you have switched around your vacume lines to your wastegate. Don't listen to those guys. I have the stock exaust, and I'm almost in the 10s, just waiting for the weather. I use washers to open the exaust between the converter and tail section, or just unbolt the cat. all together. Then I have the option of returning to a very quiet, and fast ride. Exaust is expensive, and you really do not need it. Most tracks will allow turbo cars to run without mufflers. Opening the DP/cat area is free, and works as good as any $700 exaust system.

I think you are on the right track.

How can I check for leaks with the car in the garage?

I have the turbo line going to the Qboost controller, then to the wastegate. The balls once fell outta the controller, and I have it Big ball, spring, small ball, with the bolt screwing into the small ball.

So you think somethign is leaking?

 

[turbo2nr]

Double check all nutz/boltz. Remove the boost controller, and go back to stock boost control, just to see if you can get boost steady.

 

[19TTA89]

I will have to agree with Russ on this one....If the problem goes away after he opens the exhaust...It is probably the exhaust building too much back pressure....Same thing happened to a friends car...He had an electric cutout on the car...And depending on how much he opened it...Was how much boost the car would run...He had a Cat on the car also.

 

[FlyinGN]

I third what Russ said. You actually troubleshot the car already! Its the exhaust if the problem goes away with the dump open. its a no brainer dude..

 

[marleyskater420]

but if its exhaust,then why would it still build boost THEN drop, not just not build boost at all?

 

[Russ Merritt]

Cause the system isn't saturated at idle or cruise. Takes a second or 2 to build enough back pressure to slow the turbo down....................Hence boost, no boost.......


Plenty of boost with the dump uncorked huh?

Are we learning yet......................"No problemo" (Terminator 2)

 

[bogie1]

Clogged Catalytic converter?

 

[Slo86GN]

Sounds to me like either a clogged cat or just a general exhaust restriction causing backpressure. A TE45 is a good sized turbo and it does need to breathe. Try this......go back to stock boost control, unbolt the exhaust at the 4 bolt flange aft of the cat, loosen the w/g rod a few turns....just enough so that it takes about 1/4" of pull to put it back on the puck nipple. Then take the car for a drive and ease into the boost. See what it makes for max boost. Then let it cool down and bolt the exhaust back up......go for another drive and see what the boost does. If it does the same thing...builds up to a point then drops off....you have a backpressure problem. My advice....save up and get a Hooker 2 1/2" catback from Summit Racing. Mine was $308 delivered to my door.....it's quiet at idle, mellow at hwy speeds, but flows much better than the factory exhaust. I could tell a difference in my T with the stock turbo after getting the Hooker c/b installed....bet your 45 would love it even more.....

BTW....had a 45a on my 87 GN.....had a 3" d/p, test pipe, and ATR 3" SS Single Shot....it flowed plenty of air, but the car still ran better with open dump because the turbo was moving a LOT of air, even at low boost.

 

[ijames]

Sometimes you can get rust peeling inside the exhaust pipe or muffler, that is hanging down partly blocking the flow but it doesn't hurt at low flows. Make boost and it blows the rest of the way down and blocks the pipe til you lift. Or maybe something loose inside the muffler doing the same thing. My stock y pipe started peeling inside but also rusted through so it never got to the point of blocking the flow before I got it replaced.

 

[marleyskater420]

I dont have a cat.