Quote:
Originally Posted by BuraQ
We ran some test on a IJEOS AT, when we lowered the load from 190 to 170, in the RPM range of post shift, no more flat line timing. When we raised it to 180 we got partial flat line in 5th.
There is a calculation in the load the TCU does not like and then starts pulling timing. There is consensus that its calculated torque from what I have read and have been advised from other sites.
Usually when hitting 5th gear @ WOT you should be at 120ish MPH or getting there. I would suggest going to the Requested Torque (Drive) table. Reduce column 50.00, 80.00, 100.00 on the last cells for 124 mph by 20%
Highlight the 3 cells > Press the M key > Enter 0.80 > Press Enter.
I would also suggest going with a lower load for starters. Have your load start declining from 4300 RPMs. So the two cells for 4300 - 5000 rpms start with 178.00(@ 4300 RPMs) and 175.00 (@ 5000 RPMS) etc
We didn't get a chance to test this out yet cause its been raining the last few nights here in south Florida and now we need to replace an injector  |
@BuraQ Thanks for the detailed suggestion. I wholeheartedly agree that its definitely a caclucated torque issue. Your suggestion would more than likely work but like anything with flash only it seems we always have to compromise. I like the idea of lowering the requested torque (drive) at the mph affected as this won't affect any other lower mph areas. However starting to lower the load at 4,300 RPMs obviously will shut the party down and start the taper sooner the hardware can sustain. I hate to leave power on the table to cure a tuning limitation.
I just had a huge breakthrough with the Load To Torque limit table!! I believe the word "limit" in the label to this table is very misleading. I think its really a lookup table that tells the car what torque to report for a given load / rpm. I only had to lower the bottom right cells in the 2 highest load rows from 3,000 RPM up. I don't love the idea of "tricking" the DME and TCU with lower than actual torque, but the areas I modified really only affect WOT in the mid and high RPMs in the gears that produce the most load. I'm sure the tranny is locking the torque converter shifting as firmly as it can at reported torque levels below the OTS values and my lowered values in these high load rows. I don't think there will be any negative side effects but I can't say for sure. So far so good. I wish we could just raise the torque limit and get the nanny completely out of the way but it seems like for now we have to get creative with workarounds.
This works great and I now log 0 in the torque limit active channel and don't get timing flat lines!!!
I have a more detailed post on the "other" site so I can't post the link. Its post #38 under the thread titled: " Is there a practical solution to the IJEOS timing flatline (flash only)?"