Knock knock.... who's there? KR
09-30-2006, 12:07 PM
#92
Originally Posted by Whippled 496
Yup, with the help of you guys im definately getting there. So how do i start getting rid of this mid throttle KR? I get KR in those areas when the ECT's and IATs are below 100*, so i know it has nothing to do with heat. Also, how do i get into PE quicker? I have the threashold set to 45 and the ramp in set at zero. How do i get ti to come in quicker? Cat protection is disabled.
I have looked and looked and can find nothing to do do with TM in the Allison TCM, is that where it is? I know its not in the PCM. I dont really want to mess with that thing, but i would like to understand it. Yea, the Allison shifts pretty slow, but i can adjust that and i can adjust the RPM shift point a little too, but like i said......i get a little weak in the knees fooling with that thing. I might go in and reset the TAP cells so it will learn again. I couldnt do that before, so the Allison had to adjust itself to the increased HP. maybe i will reset them and let it do a complete relearn.
I really wish i would have raised that timing a few more degrees for that last run. It held 13.5* just fine with no KR, i bet it would have held 15* too, that may have been my 13 second pass as well. Wait till i get that intercooler and i can keep those IATs in the 120*-130* range almost all of the time....i think 15*-16* timing at WOT might not be out of the question at that point.
So, i need to work on entering PE quicker and mid throttle KR now....cant wait to get this thing purring.
I have looked and looked and can find nothing to do do with TM in the Allison TCM, is that where it is? I know its not in the PCM. I dont really want to mess with that thing, but i would like to understand it. Yea, the Allison shifts pretty slow, but i can adjust that and i can adjust the RPM shift point a little too, but like i said......i get a little weak in the knees fooling with that thing. I might go in and reset the TAP cells so it will learn again. I couldnt do that before, so the Allison had to adjust itself to the increased HP. maybe i will reset them and let it do a complete relearn.
I really wish i would have raised that timing a few more degrees for that last run. It held 13.5* just fine with no KR, i bet it would have held 15* too, that may have been my 13 second pass as well. Wait till i get that intercooler and i can keep those IATs in the 120*-130* range almost all of the time....i think 15*-16* timing at WOT might not be out of the question at that point.
So, i need to work on entering PE quicker and mid throttle KR now....cant wait to get this thing purring.
Its gonna pull what it calculates as 50% of your power during shifts, also look at shift times it takes 4/10 of a second to shift thats alot
As far as entering pe I would start noticing on the ve and maf curve the general area where you start to go into pe and bump em to help with getting fuel faster.
09-30-2006, 04:23 PM
#93
Originally Posted by 02sierraz71_5.3
look under transmission calibration-torque reduction-shift tables
Its gonna pull what it calculates as 50% of your power during shifts, also look at shift times it takes 4/10 of a second to shift thats alot.
Its gonna pull what it calculates as 50% of your power during shifts, also look at shift times it takes 4/10 of a second to shift thats alot.
Originally Posted by 02sierraz71_5.3
As far as entering pe I would start noticing on the ve and maf curve the general area where you start to go into pe and bump em to help with getting fuel faster.
09-30-2006, 04:43 PM
#94
Originally Posted by Whippled 496
That stuff is in the PCM screen, all my tranny tuning is done in the Allison TCM. Its a totally different screen, with totally different selections than the tranny stuff in the PCM screen. I posted a screen shot of the Allison window. See how on the left all i have is the tranny selection.
Whats the purpose since the pcm has the same settings?
09-30-2006, 05:24 PM
#95
Originally Posted by 02sierraz71_5.3
why is the screen different is that just something solely for the allison?
Whats the purpose since the pcm has the same settings?
Whats the purpose since the pcm has the same settings?
Here is my Allison tune.....check it out.
http://www.pasadenatownhall.com/allison.zip
Last edited by Whippled 496; 09-30-2006 at 05:33 PM.
09-30-2006, 05:50 PM
#96
Here is my take on the TM with the 8.1 and the Allison. I don't think the TCM has anything to do with it, since the PCM uses timing to reduce the power for the shift and I don't believe the TCM can "talk" to the PCM like that. I think the PCM tell the TCM when and how to shift, then the TCM ajust to its settings. I know the PCM only has 4 gears in the torque reduction table, and that may just be a codeing over site on EFIlives part, but I would bet that they still control TM for the shifts. Give it a shot and reduce them all by 50% and log GM.EST_XMSN_DMA to monitor for spark retard form TM. Worth a shot.
09-30-2006, 06:05 PM
#97
Originally Posted by kbracing96
Here is my take on the TM with the 8.1 and the Allison. I don't think the TCM has anything to do with it, since the PCM uses timing to reduce the power for the shift and I don't believe the TCM can "talk" to the PCM like that. I think the PCM tell the TCM when and how to shift, then the TCM ajust to its settings. I know the PCM only has 4 gears in the torque reduction table, and that may just be a codeing over site on EFIlives part, but I would bet that they still control TM for the shifts. Give it a shot and reduce them all by 50% and log GM.EST_XMSN_DMA to monitor for spark retard form TM. Worth a shot.
Thats what Ive been thinking after looking at the tables specifically for the allison they only deal with shift timesIve used those tables to reduce TM and they will even though there is only 4 gears, baby steps Id pull 20% and see how it goes
10-01-2006, 09:37 AM
#98
Originally Posted by kbracing96
Here is my take on the TM with the 8.1 and the Allison. I don't think the TCM has anything to do with it, since the PCM uses timing to reduce the power for the shift and I don't believe the TCM can "talk" to the PCM like that. I think the PCM tell the TCM when and how to shift, then the TCM ajust to its settings. I know the PCM only has 4 gears in the torque reduction table, and that may just be a codeing over site on EFIlives part, but I would bet that they still control TM for the shifts. Give it a shot and reduce them all by 50% and log GM.EST_XMSN_DMA to monitor for spark retard form TM. Worth a shot.
Okay, i suppose thats a possibility, but just playing "devils advocate" here. Why the redundancy, if the PCM tells the TCM what to? There are parameters in the TCM that the PCM tranny section does not have. Does the TCM overide the PCMs instructions in certain instances? Are you aying that change made within the TCM have no effect on things? Thats would be a lot of work by EFILive for nothing to create that whole TCM interface. I only drew my conclusions based on what a Dmax .tun file looks like, with there being no tranny section in it at all. There is only one way to find out though...
. I will do some logging this afternnoon and see what happens.
10-01-2006, 09:40 AM
#99
er, wait.......i dont think the PCM and TCM communicate with each other at all in the 8.1L application. Where as they DO, in the diesel application. Man, i dont get why GM did it this way. I will do some logging this afternoon and hopefully find some answers.
10-01-2006, 12:45 PM
#100
Originally Posted by Whippled 496
Okay, i suppose thats a possibility, but just playing "devils advocate" here. Why the redundancy, if the PCM tells the TCM what to? There are parameters in the TCM that the PCM tranny section does not have. Does the TCM overide the PCMs instructions in certain instances? Are you aying that change made within the TCM have no effect on things? Thats would be a lot of work by EFILive for nothing to create that whole TCM interface. I only drew my conclusions based on what a Dmax .tun file looks like, with there being no tranny section in it at all. There is only one way to find out though.... I will do some logging this afternnoon and see what happens.
. I will do some logging this afternnoon and see what happens.
. If the PCM functions didn't do anything, then I think they would be grayed out. I guess the only way to find out is to make some changes and get some logs and see what happens. Just a little more R&D 