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Adjustment 1 set: Kept the 1-2 shift at 30 mph, and raised the 2-3 shift to 60 mph across all shift modes.  Raised the absolute fuel cutoff from 6700 rpm to 7000 rpm.  TM adjusted to 25%.

Interestingly, with no change in shift points the 1-2 shift revved to 6600 rpm and hit a new higher calculated hp value.

Previously the 2-3 shift was commanded at 58 but happened at 60 mph.  When I moved the commanded mph up to 60 mph it continued to be commanded at 60 mph.  More testing needed there to understand.

I observe that the car is actually slowing down during shifts, perhaps due to engine braking in sport mode.  I will plan to retest with the transmission in drive, which does not use engine braking, to see if that is advantageous.

Update:  I see a source of delay in the 0-60 time — wheelspin after the 1-2 shift is a problem.

Reinstated TM and retested.  Didn’t go WOT early enough in the retest to avoid the transmission shifting early 1-2 (shift commanded at 23 mph).

This morning I made 2 runs to determine current shift points during acceleration from a standing start.

I ran the STS-V in “competition mode”; this mode apparently uses “Cruise mode” shifting, which was a surprise to me but means a different table for the transmission logic.

Run 1: From 1st gear the shift to 2nd started at 30 mph as programmed. The STS-V reached 6,180 rpm before shifting.  The shift took 0.2 seconds.  The 2-3 Shift started at 60 mph and the STS-V reached 6,310 rpm before shifting.

HP Tuners Information

Run 2: From 1st gear the shift to 2nd started at 31 mph.  The STS-V reached 6,378 rpm before shifting.  The shift too 0.2 seconds.  The 2-3 shift started at 60 mph and the STS-V reached 6,240 rpm before shifting.  The latter is surprising since the logic appears to command the shift at 58 mph and not 60 mph.

With a goal of raising the shift points to 6600-6800 rpm, my plan is to increase the 1-2 shift speed from 30 mph to 31 mph.  In first gear, 140 rpm equates to 0.6 mph.  So a full mph increase in shift speed may raise the shift point by 230 rpm or so from 6,380 to 6,600 rpm. For second gear, 40 rpm is around 0.6 mph, so 200 rpm increase would be 3 mph, or 58 mph up to 61 mph.

I will plan to retest under similar circumstances to see how the changes effect the actual result.  What do you think?  The model predicts that hitting the proper shift points will produce a slight improvement in acceleration.  Have you done these type of adjustments to your car before?