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One thing I've noticed on occasion, with traction and stability off (press and hold for 5 sec), in first gear, under full acceleration (usually lots of tire spinning with this), the power will cut out like traction control is on. And then come right back. Maybe 1 out of 10 times. And it's been up around 5k or 6k rpm. Is this a tune issue? Belt slip? Idk what's going on... any ideas? This was noticed before the tuning adjustments were recently made.
Get a log of the problem. Just guessing I would look into knock. If the car pulls timing you will definitely feel the reduction in power.
Got a retune done, as the tuner agreed that 12.4 up top was too lean. It cost me 15hp and now the wideband is showing low 10s all the way though the rpm range. Is this too rich? Seems like common practice is in the mid 11s....
11 flat-ish may be a safe bet, little lower if it's hot and humid where you are. Frankly, giving up 15 ponies for some insurance seems smart to me unless you have the funds/motor ready to go.
It did not want to come out of reverse today, took 2 hands to pull it out. (TWSS)
Weak link after rear swap is the t-56... that tranny is great in a lighter car, but you're moving double the weight of the cars most effectively using this tranny.
After I installed my B&M, for no plausible reason, I couldn't get into 1st or reverse. I loosened the two top bolts to drop the shifter back off the chassis and worked them back in slowly assuring that the gears would engage in 1st and reverse... found that bringing the shifter up equally - one turn on one bolt one turn on the other, then stop to verify the gears were reachable (giant slow pain in the ace) - all the way to the top; eliminated the binding.
I would start there before diagnosing the tranny, but at our weight and power levels - the output shaft in the t-56 is the next to go.