I am new to modifying the turbo buick motor...or any turbo motor. I have a FAST ecu, larger turbo (stock appearing three bolt from Precision) 3" down pipe utilizing stock elbow/puck setup, larger injectors (36lb), K&N filter, no cat, ATR dual exhaust...and that is pretty much it.
What is happening is I will make two or three good clean runs, running 17psi of boost, no problems...and then the next time while the turbo is building boost the wastegate will dump without any warning. I notice the problem is worse when the trans kicks down and the rpm is over 4000 rpm.
I guess I don't know if I have a mechanical problem with wastegate or if I have a major flaw in my tuneup that doesn't show in the datalogs I have....any ideas would be a help, I want to get this squared away before intercooler, torque converter, etc.
Thanks, John
What is happening is I will make two or three good clean runs, running 17psi of boost, no problems...and then the next time while the turbo is building boost the wastegate will dump without any warning. I notice the problem is worse when the trans kicks down and the rpm is over 4000 rpm.
I guess I don't know if I have a mechanical problem with wastegate or if I have a major flaw in my tuneup that doesn't show in the datalogs I have....any ideas would be a help, I want to get this squared away before intercooler, torque converter, etc.
Thanks, John