Shifting Issues

smokinstroker92 · Jun 5, 2013

With my current setup i am having trouble getting my trans to shift properly. When 4wd launched it will tach the red line and bounce off the rev limiter for a sec then shift to second and lock the converter and move on. I did some datalogging with my AE and the pcm is not commanding the shift at the proper rpm i guess because the trans shifts when the seloniod is activated. It does this with three different tuners tunes. My question is what parameters does the pcm command shifts with? TPS and RPMS maby? If i shim the pedal off the floor so that it only reads 65% throttle the truck with shift like a dream but also does not receive full fuel.
What else could be causing this besides the tunes? Could i just be unlucky enough to have 3 sets of tunes that are off?

SeeYa · Jun 5, 2013

smokinstroker92 said:
With my current setup i am having trouble getting my trans to shift properly. When 4wd launched it will tach the red line and bounce off the rev limiter for a sec then shift to second and lock the converter and move on. I did some datalogging with my AE and the pcm is not commanding the shift at the proper rpm i guess because the trans shifts when the seloniod is activated. It does this with three different tuners tunes. My question is what parameters does the pcm command shifts with? TPS and RPMS maby? If i shim the pedal off the floor so that it only reads 65% throttle the truck with shift like a dream but also does not receive full fuel.
What else could be causing this besides the tunes? Could i just be unlucky enough to have 3 sets of tunes that are off?

Shift points are based off of TPS and speed.

I'm sure you have done this, but just checking to see if you have re-calibrated the speedo for the tire size you are running with the AE. If not, I would do that.

smokinstroker92 · Jun 5, 2013

SeeYa said:
Shift points are based off of TPS and speed.

I'm sure you have done this, but just checking to see if you have re-calibrated the speedo for the tire size you are running with the AE. If not, I would do that.

Yes i have recalibrated the speedo, could i possibly play with that and make the pcm see a higher mph and maby shift sooner? Just to see how that would do

SeeYa · Jun 5, 2013

smokinstroker92 said:
Yes i have recalibrated the speedo, could i possibly play with that and make the pcm see a higher mph and maby shift sooner? Just to see how that would do

You can experiment all you want. Just realize all the other shifting will be be screwed up. If WOT shifting is all you care about, tell your tuner that is what you want.

smokinstroker92 · Jun 5, 2013

SeeYa said:
You can experiment all you want. Just realize all the other shifting will be be screwed up. If WOT shifting is all you care about, tell your tuner that is what you want.

For a race file all i really care about is WOT shifting it makes plenty of power in the economy tune for street driving. Would that help me to pinpoint the shifting issue to be tuning related?

SeeYa · Jun 5, 2013

smokinstroker92 said:
For a race file all i really care about is WOT shifting it makes plenty of power in the economy tune for street driving. Would that help me to pinpoint the shifting issue to be tuning related?

Then that is what you tell the tuner.

Leave the AE alone if you are having the tuner fix the race tune how you want it.

smokinstroker92 · Jun 5, 2013

Yes i will do that. Ran a new tune from a different tuner today that does not have a rev limiter but still won't shift till 3600-3700 rpms but feels smooth since the motor never breaks up. What could be different about my truck that causes 3 different tuners tunes not shift on time? I just want to make sure its not something wrong with my truck.

Sent from my PC36100 using Tapatalk 2

Groomzybanshee · Jun 5, 2013

Did you have the trans tuned for 500+ hp?

SeeYa · Jun 5, 2013

smokinstroker92 said:
Yes i will do that. Ran a new tune from a different tuner today that does not have a rev limiter but still won't shift till 3600-3700 rpms but feels smooth since the motor never breaks up. What could be different about my truck that causes 3 different tuners tunes not shift on time? I just want to make sure its not something wrong with my truck.

Sent from my PC36100 using Tapatalk 2

I hope you have valve springs and push rods.

Take care of that input shaft....

riest:

smokinstroker92 · Jun 5, 2013

Groomzybanshee said:
Did you have the trans tuned for 500+ hp?

Yes the trans is tuned for 600

Sent from my PC36100 using Tapatalk 2

smokinstroker92 · Jun 5, 2013

SeeYa said:
I hope you have valve springs and push rods.

Take care of that input shaft....riest:

Yes I have valve springs, push rods, and head studs also. No input shafts yet but have snapped a billet intermediate shaft already

Sent from my PC36100 using Tapatalk 2

Shaw · Jun 6, 2013

For what its worth I've been fighting this a little over a year. (since I put 400% nozzles in) I have changed my WOT shift, and my 1-2 shift schedule multiply times. Just recently I was able to data log and see the shift solenoids command the shift but it did not shift. I was never able to see this before with AE. I was able to catch it with my pro-link scanner. I haven't decided on how to proceed, but Im thinking I might start with the solenoid pack?

smokinstroker92 · Jun 6, 2013

Shaw said:
For what its worth I've been fighting this a little over a year. (since I put 400% nozzles in) I have changed my WOT shift, and my 1-2 shift schedule multiply times. Just recently I was able to data log and see the shift solenoids command the shift but it did not shift. I was never able to see this before with AE. I was able to catch it with my pro-link scanner. I haven't decided on how to proceed, but Im thinking I might start with the solenoid pack?

Mine is similar to this but mine does shift immediately when the solenoid is commanded to