2011 997.2 GT3 Engine problem update and Dyno

[Carmon997S]

Hello everyone, I've been doing a lot of reading and researching the low RPM problem I've been having. One thing that popped out at me was the fuel pump. I couldn't ever remember hearing it run so I check the fuse box first. I found that a fuse was missing from fuel pump # 2. After looking at the fuse chart, it said #2 was only used on Turbo's. But I thought what the hay and put a fuse in the spot anyway. The car now feels like it has more power and runs a little smoother at low RPM's. Can anyone tell me if the #2 pump is used in the GT3"s. Also I took the car to the dyno today. I was very happy with the power. The SAE corrected number was 384 HP. The fuel/air mixture was perfect all the way up from 3000 RPM's. With that said the car runs great at full throttle but still runs a bit rough at low RPM's cruising. I hope I can find the answer soon.

[ericinboca]

Hello everyone, I've been doing a lot of reading and researching the low RPM problem I've been having. One thing that popped out at me was the fuel pump. I couldn't ever remember hearing it run so I check the fuse box first. I found that a fuse was missing from fuel pump # 2. After looking at the fuse chart, it said #2 was only used on Turbo's. But I thought what the hay and put a fuse in the spot anyway. The car now feels like it has more power and runs a little smoother at low RPM's. Can anyone tell me if the #2 pump is used in the GT3"s. Also I took the car to the dyno today. I was very happy with the power. The SAE corrected number was 384 HP. The fuel/air mixture was perfect all the way up from 3000 RPM's. With that said the car runs great at full throttle but still runs a bit rough at low RPM's cruising. I hope I can find the answer soon.

I had a fuel pump go bad in my 986S race car many years ago. When hot and I backed off the throttle, dropping RPMs to 3500 or less, car would not go at all. RPMs would just keep dropping - no power. Around the paddock, hot, it would sputter around. Cool, though, it ran fine, and as long as I was hauling the mail at high RPMs, no issues. Toward the end of sessions, it would start failing in certain corners where the RPMs were dropping down. Finally it would not even start hot.

It was weird and before I figured it out, I wondered if I had bad fuel. No engine codes, nothing.

Just sharing to help with diagnosis.

[Carmon997S]

Thanks for the input, good to know. I don't think mine is as bad as you describe. I'm still waiting to hear back from porsche to see if it's just the way the motor is tuned.

[JoeLima]

But dont forget the GT3 is much much rougher than a S or something. A friend of me said it good " it feels like some bolts and nuts are not properly tighten"