I got my new downpipe in today, and installed.
I still have boost creep, but it is 90% better than it was.
Fuel cut is set @ 13 psi for testing purposes with emanage.
First gear, no fuel cut, hit about 7 psi close to red line.
Second gear, fuel cut @ 6200 rpm
Third Gear, Fuel cut @ 5800 rpm
This is a turbonetics 62-1 bolt on. I'm using a 300zx wastegate actuator and this thing is on a heavily ported stock manifold. Had problems with Wastegate flap in BIC DDP before, so I swiched to a cooleze mega mouth DP, and It improved the situation greatly, but still didn't fix it.
The actuator moves freely, and we made it adjustable. I can adjust it all the way out, to where the door is slightly open and don't get boost until 4200. After that, it settles at 5 psi a moment, and then starts climbing in 4th gear until fuel cut.
The climb in boost is not linear when the creep comes on. The more boost, the faster it climbs. @ 10 psi the actuator has moved Approx 3/4 of an inch, which seems about right. This was testing with a pressure pump and a gauge.
So based on the above information, am I assuming correctly when I think that the hole in the exhaust housing for the wastegate is somewhat undersized and causing my problem?
If so, I will pull turbo tomorrow and take it to the machine shop. The wastegate hole will be drilled larger if you guys think that would solve the problem.
I still have boost creep, but it is 90% better than it was.
Fuel cut is set @ 13 psi for testing purposes with emanage.
First gear, no fuel cut, hit about 7 psi close to red line.
Second gear, fuel cut @ 6200 rpm
Third Gear, Fuel cut @ 5800 rpm
This is a turbonetics 62-1 bolt on. I'm using a 300zx wastegate actuator and this thing is on a heavily ported stock manifold. Had problems with Wastegate flap in BIC DDP before, so I swiched to a cooleze mega mouth DP, and It improved the situation greatly, but still didn't fix it.
The actuator moves freely, and we made it adjustable. I can adjust it all the way out, to where the door is slightly open and don't get boost until 4200. After that, it settles at 5 psi a moment, and then starts climbing in 4th gear until fuel cut.
The climb in boost is not linear when the creep comes on. The more boost, the faster it climbs. @ 10 psi the actuator has moved Approx 3/4 of an inch, which seems about right. This was testing with a pressure pump and a gauge.
So based on the above information, am I assuming correctly when I think that the hole in the exhaust housing for the wastegate is somewhat undersized and causing my problem?
If so, I will pull turbo tomorrow and take it to the machine shop. The wastegate hole will be drilled larger if you guys think that would solve the problem.
I'd say its worth a shot to port it out, if the downpipe helped that much then porting the WG port must do some good.