Talesin
15+ Year Contributor
- 1,718
- 36
- Jan 19, 2005
-
Burbank,
California
Just installed my MBC, and since I have all the supporting fuel mods (minus injectors) to run higher boost levels, figured I'd give it a nice little bump.
Popped to 15psi, no problems. Pulling good and hard through second. Bumped it to 19. Beautiful, though a bit of 'shudder' at WOT in second, so I dropped it down to 17, figuring that it might be a 'soft' fuel cut. No fix, but I've already felt how hard the car can pull, I'd be disappointed dropping to 15 again.
Took it out on the freeway after rush hour had passed, and the problem seems to get worse in third. I noticed that on uphills, at 6000rpm, I'm only getting about 55mph out of it. Also feels like it's sluggish, or not spooling the turbo. But downhills, it just takes off and screams along.
So, I've come to the conclusion that the clutch is most likely slipping. There's no carbon-clutch stink, but until my datalogger gets here, I won't exactly be able to track the rpm vs speed, and see how much it actually changes, or if it's just relative perception, with the faster accel on downhills.
Suppose my question(s) would be, is there a 'gentle' fuel cut? Could this just be pulled timing (running on 91, with 450cc squirters)? Or am I facing the cost and down-time of a new performance clutch at this point?
I'll probably end up with a Centerforce dual friction, if it's the last of the bunch.
Popped to 15psi, no problems. Pulling good and hard through second. Bumped it to 19. Beautiful, though a bit of 'shudder' at WOT in second, so I dropped it down to 17, figuring that it might be a 'soft' fuel cut. No fix, but I've already felt how hard the car can pull, I'd be disappointed dropping to 15 again.
Took it out on the freeway after rush hour had passed, and the problem seems to get worse in third. I noticed that on uphills, at 6000rpm, I'm only getting about 55mph out of it. Also feels like it's sluggish, or not spooling the turbo. But downhills, it just takes off and screams along.
So, I've come to the conclusion that the clutch is most likely slipping. There's no carbon-clutch stink, but until my datalogger gets here, I won't exactly be able to track the rpm vs speed, and see how much it actually changes, or if it's just relative perception, with the faster accel on downhills.
Suppose my question(s) would be, is there a 'gentle' fuel cut? Could this just be pulled timing (running on 91, with 450cc squirters)? Or am I facing the cost and down-time of a new performance clutch at this point?
I'll probably end up with a Centerforce dual friction, if it's the last of the bunch.
