Quote:
Originally Posted by Pro Stock John
What are you thinking of about the shift points? Not that I'm always a maven for mph, but I was thinking that you'd be seeing 112-113... Does the pcm lock up your converter in 3rd?
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I have not changed any TCC or lockup features. The only thing I have changed is to increase the shift pressure (by about 50%) and decrease the desired shift time (by about 0.25) on the 1-2, 2-3, and 3-4 shifts.
The 3200 torque converter adds something to the equation that I'm not enough of an expert at. It works fine now. In the past (in my WRX and my GTO), I have tried commanding lock-up in 3rd and did gain MPH, but on the above graph, it would look like another shift.
Just looking at that chart, I noticed the dip in HP on the shift, and as importantly, the length of the dip. So on one run, I tried subtracting more time on the desired shift time, but I didn't notice a change. You can only "desire" so much shift time, I suppose. Maybe I can add more pressure.
Last month, with the torque converter first installed, I had to add time on the 1-2 shift, because it "gulped" on the shift (commanded throttle position even dropped). So adding time cleared that up.
Basically, from my experience, I do suspect that commanding lock-up in 3rd would gain me less than 1 mph. But I haven't tried it formally on this setup yet.
Timing adjustments have helped me fine tune the car more than the initial transmission tune.
Padre