GN87Mike
Active Member
- Joined
- May 28, 2001
I can use some help. I have a problem not being able to hold a constant boost (26 lb.) during a run. See my signature for my combo. I foot brake and have no problem getting 26 lb as I launch but the boost drops immediately to 19-23 lb through 1st, 2nd and third. When the converter locks at the top of 3rd I hold a steady 26 lbs. Attached is the power logger file of my last run (10.64 - 126.3) and time slip.
I did a test to verify my wg operation. No adjustments have been made since the run. I set a dial indicator on the wg arm and supplied regulated air to the RJC controller (see picture). The RJC is adjusted close to max and the wg actuator rod is 7.5 turns tight. The one thing I can't simulate is the exhaust pressure trying to open the puck. With the dial zeroed at zero pressure - at 20 lb it shows .000", at 25 lb it shows .001", at 30 lb it shows .004", and the wg opens with .076" movement at 32.5 lb. When I reduce pressure back to 30 lb the dial returns to .005". I assume from this that with the exhaust pressure helping to open the puck that it is controlling at approx 26 lb of boost.
Attached is a picture of the wg puck and the exhaust housing. It's not the best but I do have steady boost at lock up. The wg hole measures .965"- .980".
So is my converter too loose? Do I need a new turbine housing.....maybe a .85? Should I just go to an external gate? I think I can pick up a little if I correct this...it's one of my winter projects .
Thanks,
Mike
I did a test to verify my wg operation. No adjustments have been made since the run. I set a dial indicator on the wg arm and supplied regulated air to the RJC controller (see picture). The RJC is adjusted close to max and the wg actuator rod is 7.5 turns tight. The one thing I can't simulate is the exhaust pressure trying to open the puck. With the dial zeroed at zero pressure - at 20 lb it shows .000", at 25 lb it shows .001", at 30 lb it shows .004", and the wg opens with .076" movement at 32.5 lb. When I reduce pressure back to 30 lb the dial returns to .005". I assume from this that with the exhaust pressure helping to open the puck that it is controlling at approx 26 lb of boost.
Attached is a picture of the wg puck and the exhaust housing. It's not the best but I do have steady boost at lock up. The wg hole measures .965"- .980".
So is my converter too loose? Do I need a new turbine housing.....maybe a .85? Should I just go to an external gate? I think I can pick up a little if I correct this...it's one of my winter projects .
Thanks,
Mike