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View Full Version : Surging boost with Profec B spec II


240_keyy
09-17-2003, 01:43 PM
Hey all, maybe I am just an idiot (actually, let's just say that I am an idiot to make it easier) but I am having one hell of a time tuning this damned profec B spec II boost controller. I have the set boost set at 64% with the gain set at 15% and the start boost set at 13psi and I am getting this problem where the boost will spike up to about 14.5psi and then drop down to 9psi, then spike back up to 14, then go back to 9 then back and forth and back and forth but it will never hold a constant level of boost. I have tried turning up the gain, but that doesn't seem to help any at all, and I have set the start boost at everything from 9psi to 14psi, but to no avail. All of the lines are hooked up correctly and the controller is getting it's boost signal from the FPR so I dunno WTF could be wrong.

Does anyone have any ideas or suggestions?

Roly
09-17-2003, 05:33 PM
possible bad wastegate.

240_keyy
09-17-2003, 09:31 PM
ya but it works just fine at stock boost and when I had my MBC...?