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purplehaze purplehaze is offline
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Join Date: May 2005
Location: Waiting to pass you, or Sebastopol CA
Posts: 349
Originally Posted by 930gt-40r View Post
........including 140 mph passes with a voltmeter sitting in my lap connected to the map sensor circuit....
Wussie. It was no more than 135, but who's counting.

I had similar issues with my Proto system. Tuning for wide open throttle (WOT) is often easier than the around town, or gentle transition stuff.

If the issue just started (engine is warm, and the cyl head temp sensor is good), it's probably the pressure sensor or a vac leak. You might want to double check all vac lines are zip tied, no cracks, and nothing has come loose. I would always have a vac leak somewhere when it was running rough.

If it's always been this way, it's probably the tune. Assuming you've done no other hardware changes (replaced turbo, exhaust, cams, intake, I/C, etc). Pressure sensing is very sensitive to these changes, and a re-tune is usually required.

Have you rang Prototech yet? Or Todd Knighton, Protomotive?

Glad you dialed it back when it got hot. Hope you throw another cooler in it so you can get back on the track.

Good luck!
87' 930TT
Old 01-21-2009, 08:02 AM
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