Dannn
August 29th, 2015, 05:32 AM
I've had an odd downshift flare ever since I swapped my jeep about 25,000 miles ago.
Specs:
98 Wrangler
03 LQ4
05 4L65E
3.73 Gears
33" tires
Wiring harness/0411 computer is out of a 2001 Yukon Denali XL that came with a 60e
Tune is based off a 156 2002 lq9 escalade if i recall.
Custom OS5 - issue was still present before the COS.
4th-2nd WOT downshifts are causing a flare. It seems like the trans engages 2nd, then slips a little bit, then re-engages 2nd. The flare gets worse the higher the speed. I'm attaching 2 pictures of log files with 60mph downshifts showing a slight 100-150rpm flare at 3k. I haven't had a chance to log a WOT downshift from a higher speed to see if the rpm flare is any higher.
Its been doing this for as long as I can remember. This is the 2nd trans i've put in the Jeep, and is strong everywhere else. The 1st one went out shortly after I built the Jeep due to the terrible mail order flash I had done before I got efilive. I've put probably 20,000 miles on this trans without issue, or the problem getting any worse. But both transmissions did the same thing.
Is it a tuning issue, or a mechanical issue? I've raised the shift pressures, bumped shift points, etc. Not sure if I should be looking into TQ management on a downshift?
Log, tune, and photos attached.
Thanks in advance.
1876418765
Specs:
98 Wrangler
03 LQ4
05 4L65E
3.73 Gears
33" tires
Wiring harness/0411 computer is out of a 2001 Yukon Denali XL that came with a 60e
Tune is based off a 156 2002 lq9 escalade if i recall.
Custom OS5 - issue was still present before the COS.
4th-2nd WOT downshifts are causing a flare. It seems like the trans engages 2nd, then slips a little bit, then re-engages 2nd. The flare gets worse the higher the speed. I'm attaching 2 pictures of log files with 60mph downshifts showing a slight 100-150rpm flare at 3k. I haven't had a chance to log a WOT downshift from a higher speed to see if the rpm flare is any higher.
Its been doing this for as long as I can remember. This is the 2nd trans i've put in the Jeep, and is strong everywhere else. The 1st one went out shortly after I built the Jeep due to the terrible mail order flash I had done before I got efilive. I've put probably 20,000 miles on this trans without issue, or the problem getting any worse. But both transmissions did the same thing.
Is it a tuning issue, or a mechanical issue? I've raised the shift pressures, bumped shift points, etc. Not sure if I should be looking into TQ management on a downshift?
Log, tune, and photos attached.
Thanks in advance.
1876418765