Waldorf
Old School
- Joined
- Feb 26, 2015
- Threads
- 2
- Messages
- 666
- Reaction score
- 251
- Location
- Heart of Dixie
- Vehicle(s)
- 2016 3Y PP
Talked to a local tuner yesterday about this. I mentioned guys were stalling with the S550's. Right away, his example was: "Run it up to 6500 in third, let off the pedal and push in the clutch." LMAO because I did exactly that last weekend after reading this and other related threads. I thought maybe going from no vacuum at full throttle, then backing off might suck the throttle plate shut. No air = stall. Only I let it come down in gear on it's own and didn't hesitate, lope, or stall. The reasoning is that the PCM now is a torque based system. It senses the torque going up and tries to deliver it to the wheels (or not). However, pushing in the clutch pedal after winding it up or WOT... all of a sudden, no torque to the drivetrain. It goes nuts and doesn't know what to do, so it may just give up and just shut down. I've never had it happen (yet) but I always let the car come down in gear before a stop.
Here's the "or not": I also recall that guys were having problems initially with 2015's at the strip with slicks. Come off the line, spin a little, hook up, then bog. Couldn't replicate it with street tires. IIRC, the problem was the PCM was limiting torque output. It sensed a big spike in torque on hook up, and said, uh uh. It can do this by pulling timing, fuel, or both. Strange animals these drive by wire computer controlled engines. Glad I also still have a pushrod 5.oh with a throttle cable. Only thing the computer controls is the A/F ratio and total timing.
This certainly doesn't apply to everyone's problem that's posted, but might help a few. And for those that it doesn't:
Your results may vary. Void where prohibited by law.
That is all...
Here's the "or not": I also recall that guys were having problems initially with 2015's at the strip with slicks. Come off the line, spin a little, hook up, then bog. Couldn't replicate it with street tires. IIRC, the problem was the PCM was limiting torque output. It sensed a big spike in torque on hook up, and said, uh uh. It can do this by pulling timing, fuel, or both. Strange animals these drive by wire computer controlled engines. Glad I also still have a pushrod 5.oh with a throttle cable. Only thing the computer controls is the A/F ratio and total timing.
This certainly doesn't apply to everyone's problem that's posted, but might help a few. And for those that it doesn't:
Your results may vary. Void where prohibited by law.
That is all...
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