*FIXED*Strange TPS related cut problem. Tephra ROMs
 

Hi all,

I have a 2001 EVO VII JDM GSR which originally ran the 98640014 stock rom, with this rom i am able to accelerate at WOT to redline with no hassels, as expected. I have downloaded the Tephra v5.10 90550001 rom and payed for the V7 rom as well.

With those two maps i have a problem where if i accelerate at WOT i get this strange cut, and the car bucks back and forth. I have done some logging last night on the stock rom and the Tephra V7 rom.

The results can be found below:

I am leaning toward increasing the fuel cut load x1 values to try and get around this problem. Does this sound like a solution or am i off track?

I am only new to this and trying to learn as fast as i can. I have found this forum very informative.

Thanks,
Acea

I have just completed logging several WOT runs back to back. I changed the fuel cut load x1 parameters and nothing changed. All i can tell is that it does not happen until the 3000rpm mark or over. I accelerated past 3000rpm with the TPS not at 100% and then pushed the accelerator to the floor, the problem occured at whatever RPM i was at when the pedal hit the floor.

This has me stumped, i have gone over the new log and nothing seems the same when it happens, other than it occuring around 3000rpm for most runs.

Any ideas?

As requested.

Any ideas yet? I've run into a similar issue while testing Tephra today on a 2004 Evo VIII. 6.5K RPM and I'm hitting a wall.

No idea at all yet. I have looked into lots of things and changed all that seems relevant to no avail. Problem still exists. I might have to shoot Tephra an email and ask him if he has any ideas.

I find it hard to believe that no one knows whats going on. Surely someone has a clue as to what is happening and how to fix it.

I have become annoyed with the two affected ROMs and switched back to the stock ROM for the time being, I added in some boost and took away some timing, that will keep me busy for now or until i can shed some further light on the problem.

Sorry i can't be of help.

You're dragging your foot on your clutch pedal ever so slightly and engaing NLTS. Either disable it or raise your left foot.

It happens a lot to me too, FYI...

you don't have valet enabled do you? for 3000rpm? and its not disengaging correctly, just wondering if you raise the rpm level

Disable NLTS!!!!! It doesnt work on some JDM Evo 7's

Ive encountered this on almost every JDM Evo 7 Ive tuned, that simply dont like NLTS


This will fix your issue 100% {thumbup} (hopefully ;))

Mate, your a legend. Problem solved.

I would like to thank all who posted. If anyone ever comes to Darwin drop me a message, i will buy you a beer.

Thanks
Acea