Nistune Users ?

[beans33]

To anyone who has had success with nistune I have a question. Yesterday a friend and I were just cruising around just dialing in my idle and cruising air fuel numbers(no load). Everything was going fine the car responded to every change that was made, eventually we had it idling in the high 14's and cruising was about the same. Out of now where the S**t hit the fan (not literally) but the car was like it was reading from a different map or something. My idle and cruising air fuel numbers were now in the 9's and 10's. Weird thing is the car still ran fine ? I would think with numbers that rich it would stumble and fall on its face. I drove it back home 45 min away with 9.3 - 10.0 air fuel numbers at 75 mph, I again thought it would be running rough with these numbers but drove just fine. I have come to the conclusion that CA's due like to run a little on the rich side but not that rich. Now for my question. What would make it just change everything we had to running so rich. Wideband need calibrated again ? Blow thru setup dirty ? o2 sensor ? any help is appreciated guys and gal *

Thanks

[r34 gtr]

Do you have a complete map you made that you can just re-flash to the ECU? I'm not familiar with Nistune, but it has worked for me on numerous occasions with other systems (especially MSII).

I have no idea what could cause your problem though. That's just crazy.

Also, my CA18 was never happy unless it was idling at 12.5:1. I just figured it knew best and never touched it. They run fine with shockingly low air/fuel ratios. I remember the first time I had mine dynoed and it was at about 7:1 at redline in 4th. Still pulled fine and made 150whp, stock. A bit low I realize, but 7:1?? I was expecting zero hp.

[D_Stirls]

did you turn of the O2 feedback when you did the original tuning?

[beans33]

Yea i did i looked at it and it was staying at a certain voltage, so I did turn it off. I guess i wired my o2 wrong. But I did that before we did the initial tuning which went good.

[mbmbmb23]

O2 sensor mucked up with carbon? Where do you have the sensor installed in your setup? How far from the manifold?

[mydato]

Did you play with your TP settings or injector latency? All sensors working. The temp sensor can cause over rich conditions. Goto the Nistune forums and post up your bin file. You will get the help you need there.

[beans33]

o2 feedback was turned off the whole time. Im not exactly sure what he played with while I was driving just fuel map and K value I assume.

[croustibat]

Could be a faulty engine temp sensor (it causes the engine to go in "cold mode", where it sends a lot more fuel).

Oem fuel mapping is terribly overfuelling anyway, no wonder it works at 9:1