DrX
August 2nd, 2014, 12:23 PM
Finally got to the track last weekend to break some parts. The logs show that in Normal shift mode, commanding shifts at 5800 RPM, there was 200 RPM of overshoot. In Performance shift mode, commanding shifts at 6500, I was hitting my 7000 RPM ETC rev limiter. Except for the 2-3 Performance shift, WOT shift MPH was setup so that corresponding RPMs were below the WOT shift RPM values. For Normal mode this difference was 400-500RPM for 1-2 and 2-3. For Performance mode the difference was only 40-50RPM for 1-2, for 2-3 the difference was actually -ve so I've changed that. But both 1-2 and 2-3 hit the rev limiter in Performance mode. Is this a tuning issue or am I about to lose another 80E? Otherwise, the trans did seem to be performing well.
The first screen shot below shows a 1-2 shift when commanded at 5800 RPM. The next screenshot is a 1-2 shift when commanded at 6500 RPM. It appears that in the case of the latter, the shift would not have occurred at all would the rev limiter not have closed down the throttles. I don't see any conflict with the kickdown tables.
The tune is scaled 50%.
In the video linked below there are 3 runs shot with a Go Pro inside the truck. The first of these runs(10.99 ET)was with shifts commanded at 6500 and you can hear the throttle dip at each shift. The final run was with shifts commanded at 5800 and you can hear the quicker shifts with no throttle dip. You can also hear the rear u-joint let go after the 2-3 shift!
http://i114.photobucket.com/albums/n241/TDOC2004/log2_zps7e834893.jpg (http://s114.photobucket.com/user/TDOC2004/media/log2_zps7e834893.jpg.html)
http://i114.photobucket.com/albums/n241/TDOC2004/log_zps145e4999.jpg (http://s114.photobucket.com/user/TDOC2004/media/log_zps145e4999.jpg.html)
https://www.youtube.com/watch?v=Cx9zefG2q2E
The first screen shot below shows a 1-2 shift when commanded at 5800 RPM. The next screenshot is a 1-2 shift when commanded at 6500 RPM. It appears that in the case of the latter, the shift would not have occurred at all would the rev limiter not have closed down the throttles. I don't see any conflict with the kickdown tables.
The tune is scaled 50%.
In the video linked below there are 3 runs shot with a Go Pro inside the truck. The first of these runs(10.99 ET)was with shifts commanded at 6500 and you can hear the throttle dip at each shift. The final run was with shifts commanded at 5800 and you can hear the quicker shifts with no throttle dip. You can also hear the rear u-joint let go after the 2-3 shift!
http://i114.photobucket.com/albums/n241/TDOC2004/log2_zps7e834893.jpg (http://s114.photobucket.com/user/TDOC2004/media/log2_zps7e834893.jpg.html)
http://i114.photobucket.com/albums/n241/TDOC2004/log_zps145e4999.jpg (http://s114.photobucket.com/user/TDOC2004/media/log_zps145e4999.jpg.html)
https://www.youtube.com/watch?v=Cx9zefG2q2E