Nistune Forums

Resolved! Received this email from Matt: Hi Rich Might be best to go through this via email. I haven’t had a chance to look closely between the 5 images and various log files in the two threads which were posted on the forums in enough detail to work out exactly what was going on until now. Did brie...

EDIT: just saw the other thread, Email sent.

Damn. I do not believe that's really an easily achievable option for me. I don't know anyone local who would have a base image programmer.

I wonder if Matt has any input.

We've actually had this convo before. At some point I had a 48XXX base on there somehow, but that has since been resolved.

Currently: 23710-41P60 Rev: 14 (U)

Great, that tune cleared up what I was wondering. Now, I ran the car with that tune, and it feels good. I datalogged some pulls through the gears, and the hesitation and snap to normal AFR is very visible. You can see the AFR bounce around everywhere from 2500 to 4500, getting especially high at 430...

Firstly, thanks for your time. I appreciate it vastly! (I am not at home to have nistune open, so I am going from memory for this response) So, I need to make sense of the TP scaling. You want to have it scaled so you do not exceed your maps max TP column (so at max load, your TP is aligned with you...

3.1.5 attachments.

Unfortunate news. I adjusted (matched) the scaling from the fuel map to the ign map, adjusted the gear coef to 0. I'm glad to know that I'm only accessing one fuel and ign map, I feel more in control now. However the issue remains (exact same AFR jump) at the same point. I also had to immediately sw...

I will try a tune based on your observations and will report back, thank you. The reason for the difference between the scaling is because I adjusted the scaling to keep the active cells within the total matrix (aka not slamming into the last cell too early, or not utilizing the whole map). I cannot...

bump. I ought to mention that all those physical changes to the car were done for other reasons, but none of them resolved this issue. I will say, it does feel healthier with the bump in fuel, so it is slightly responding, but I'd have to really push the values up to cancel out whatever is happening...

An earlier log and tune, to show the lack of change even with adjusted fuel cells.

Hey everyone, So my car (1991 Z32) has developed a lean spot I can't seem to tune out. During WOT, there is a spot from around 3800-4500 where AFR jumps up to around 16:1 or so, then when it finally moves over a single column on the fuel map, it blasts forward and stops hesitating, the AFR drops dow...

No sir! thanks for the offer though. I believe the issue has been resolved. I switched to the correct base file, completely re-tuned the car, and its running better than ever! Logged some runs and the timing is reasonable again. What is the best way to effectively lean out the fuel through the entir...

Understood. I don't think I have any issues with TTP.

This has been a very helpfup thread for me! Thank you guys.

I'll report back when I can gather some datalogs with timing and AFR. The engine is already running much smoother so I'm excited for the results.

If TTP max was too low, you mention I'd be leaning out. Do you mean leaning out as RPM/load increases? (like hard to keep AFR down?) I've got latency at about 980 uS and it's nice with the 150 K. I 'can' drop the K down to around 120 and up the latency to say 1100 uS and it'll idle great, but it's d...