1slowhatch
Proven Member
- 172
- 2
- Mar 5, 2014
-
Reno,
Nevada
Just installed a used Big16G OEM Mits turbo. No free play, spins freely. I ported the stock 2g manifold, 02 housing, turbine housing, etc. I have done a boost test, double checked exhaust leaks, new gaskets, etc. The turbo makes good boost around 4500rpm (15psi) in my car. I am at 4500 ft elevation. I was expecting spool to be much closer to 3500ish RPM.
I did some testing today. I've read that a bad WG actuator can cause problems. I tried shimming it away with washers under the mounts (to insure the flapper is closed) and it made no difference. With no boost controller hooked up, I only get around 8 psi. With the controller maxed out, I get a 17 psi spike, falls to 15 or so.
Does it sound like a bad wastegate actuator? What else could be causing the slow spool? I have stock exhaust less the rear most muffler.
I did some testing today. I've read that a bad WG actuator can cause problems. I tried shimming it away with washers under the mounts (to insure the flapper is closed) and it made no difference. With no boost controller hooked up, I only get around 8 psi. With the controller maxed out, I get a 17 psi spike, falls to 15 or so.
Does it sound like a bad wastegate actuator? What else could be causing the slow spool? I have stock exhaust less the rear most muffler.