84ace

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

84ace

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?

84ace

As requested.

dr_latino999

iTrader: (12)

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.

84ace

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.

BigT

iTrader: (8)

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...

And

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

philr8

iTrader: (4)

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% (hopefully )

84ace

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