chaye
20+ Year Contributor
- 375
- 0
- May 29, 2002
-
salem,
Oregon
Hey guys, this may be a stupid question but it has me and my buddy scratching our heads and having to down bottles of aleve to relieve headeaches....JK
The set up..
My set up:
I bought a Big16g from a buddy (im thinking USDM) and a external dumptube O2 housing. I did some minor porting on the turbo but left the wastegate alone. The wastegate on mine has no porting what so ever.
My buddy:
He bought a "JDM" engine that had the cyclone intake manifold, 515cc yellow top injectors, what we believe to be a BIG16g (cause it looks exactly like mine, impellers look the same and the inlet of the turbo are the same size) and the o2 housing.
The engine is in the machine shop and so we decided to install the big16g in his car. Low and behold we got mad boost creep. We took it off built a dump tube like mine and went ahead and ported the hell out the wastegate side as well as flapper window (?) and the turbo manifold ( took off the step)
Now, I get some boost creep (bout 2psi) but my buddy ( with equal set up as mine) get boost creep like crazy. We turned down the boost as much as we could (8psi) and when he goes WOT on 3rd gear boost reaches 10psi and stays there for bout a second then creeps up all the way to 21+psi. Any guesses?
So what do you guys think is the problem, could it be that the "jdm" turbo is different if not crappier than the usdm one?
long post.....sorry and thanks in advance
The set up..
My set up:
I bought a Big16g from a buddy (im thinking USDM) and a external dumptube O2 housing. I did some minor porting on the turbo but left the wastegate alone. The wastegate on mine has no porting what so ever.
My buddy:
He bought a "JDM" engine that had the cyclone intake manifold, 515cc yellow top injectors, what we believe to be a BIG16g (cause it looks exactly like mine, impellers look the same and the inlet of the turbo are the same size) and the o2 housing.
The engine is in the machine shop and so we decided to install the big16g in his car. Low and behold we got mad boost creep. We took it off built a dump tube like mine and went ahead and ported the hell out the wastegate side as well as flapper window (?) and the turbo manifold ( took off the step)
Now, I get some boost creep (bout 2psi) but my buddy ( with equal set up as mine) get boost creep like crazy. We turned down the boost as much as we could (8psi) and when he goes WOT on 3rd gear boost reaches 10psi and stays there for bout a second then creeps up all the way to 21+psi. Any guesses?
So what do you guys think is the problem, could it be that the "jdm" turbo is different if not crappier than the usdm one?
long post.....sorry and thanks in advance
