yes. I have the Transgo HD2.
I have been pondering the following...seeing how most of us know that adding torgue reduction helps soften the shift, does it also have any effect on the shift time and if so does anyone know what that would equate to. Basically for fine tuning shift feel/speed, so maybe add alittle torque reduction instead of upping the shift time by a small amount.
My understanding is that the PCM tries to meet the commanded shift time by the controlling the rate at which it ramps pressure to/from the commanded shift pressure, and that torque reduction is performed on top of that...
i.e. torque reduction does not appear to effect shift time from the logs I've seen [where the shift times were under 1 second].
Thanks joecar, that has been my understanding, just happen to notice that as I increase torque reduction the shift perceives to be slower. I am guessing what I feel is the motor just starting to laydown due to torque reduction on the anticipated shift. Hmmm...I am going to do some more logs, any special pid's I should look at other than the obvious ones?
There might be an EST_xxx_DMA pid also.
Maybe larger amounts of TR might just overwhelm the shift time.
I looked thru some of my old logs, and I see that my understanding is limited to shift times under 0.4 seconds on F-car and Y-car only.
I do know that on F-cars, it pulls timing out ~.25 seconds before and after the shift, so the shift may be perceived to be slower.
slow67, thank you for that info. I will have to check my logs and see if the same is true with the truck/suv segments.
Originally Posted by InTruckDesign
It may not be exact, but thats the seat of the pants feel.
Posting Permissions
Reply With Quote