Nistune Forums

I appreciate all the help. I've gotten tired of messing around with it. The whole setup is getting sold to replace the VG with a different engine.

All of the logs I uploaded have the AFRs along with Boost level on them. Are you not able to see them?

Here's the tune, hit the 3 attachment limit on the last post.

Here's the latest version of the tune along with the last few logs I ran.

I'm just worried this ECU is having some kind issues with the injector drivers or something. That would be rather upsetting as I just got it to replace the one that was randomly cutting the car off.

What does the "Default TP/RPM Scales" flag do?

Just as a follow up, I set the "Load (TP) Cut" to 255 across the board and no difference. It still stutters and hesitates in boost, with the Injection Time (LHS) bouncing up and down between 5 and 10 ms. I also swapped my distributor out and I'm still getting the little hiccups while cruis...

Nevermind, going back and reading the tuning guide again answered my question. So that just leaves the issue with the "hiccup" while cruising, if anyone has thoughts on that.

Could this be the cause of it having issues in boost?

I did what you said and opened 2 copies of Nistune and was able to get all of the relevant tables and info copied from my old tune into a fresh stock 87T tune. Car definitely runs better. Idle is smoother. Though it's not fixed, the two issues I was having above are still there. If anyone wants to t...

I'm also getting stuttering in boost now, which it didn't do that even the other day after installing the ECU. Looking like the injector timing is all over the place for that.

I did some logging and below is a screenshot. You can see the dip in the AFR where the stumble happens, and right before it the injector timing spikes.

I thought you could copy the fuel/timing maps straight over and then just adjust the K constant... Anyway take a log with the injection time and AFRs (from wideband) and see if the injection time is spiking at all (or the MAF or TP) in the log file When I copied them it messed up the TP scale acros...

I replaced my Nistuned 84T ECU this past weekend with an 87T ECU with a new Nistune board. After replacing it we more or less had to retune the car as almost nothing was able to easily port over from my old tune, I guess due to address file differences. We got that handled without much trouble, my m...

How close is the BOV to the MAF? If it's too close it may mess with the readings the MAF is getting when it opens.

Does anyone know of a dyno tuner in Virginia that works with Nistune?