Thread: NEMU Cold Tuning

I need a few more clues. Try disabling O2 ("Misc" tab, "Sensors" group, "O2 Enabled" check box) and let me know if that solves the issue. Please record a log of your test.

Thanks,
Dave

oh, so its typical to run the z32 and "small" injectors at ~64000 K values

No O2 sensor here, also disabled in tune. I got some logs for you that I'll shoot your way tonight.



The higher flowing the MAF, the higher the K value. The bigger the Injectors the lower the K value. This is why running 370-500cc injectors with a medium flowing maf, E60, your K value will be very close to stock value of ~30,000.

So Big MAF and Big injectors would keep close to stock? I thought 600cc injectors (sti@4bar) was a decent size lol

Much bigger, so think of it almost in WHP values. E60 maf is good for ~300 whp, while 370-420 (4bar) is good for 290whp, so they technically equal out. Z32 maf is good for 500whp, find injectors that are good for that amount and you might have a K value close to stock.

Keep in mind K value is not a big deal anymore with current injector size. With Z32 maf I kept K value at stock ~30,000 value. It meant that -25 Hg to 0 psi was only 20 TP apart, where on E60 maf it was 70 TP apart, that's because of much less down low resolution on Z32 maf. Now that my K value is at 64,000, I'm at 50 TP between -25 Hq and 0 psi.

Yes, please do! Thanks!



This is exactly the reason I added the injector size parameter to TunerCode.
You use higher K with a larger MAF to correct (increase) the load calculation to keep your load scale consistent.
You use injector size to correct IPW (decrease) with larger injectors.

Dave

thats what i said (wasnt a question)

Indeed I was just adding on to it

I have the same issue - when engine is cold, it runs poor compared to when its heated up.
I read on the nistune forum that some guys with RB and CA engines had the same problem and got it fixed by increasing the timing (in a certain enrichment table). Never had a chance to deal with it but I will give it a shot in the coming days and will let you know if it changes a thing.

The tune I was using I thought was OEM base, but it was my attempt at an Avenir replica with USDM base code.

Right now my b15 is down, but I rebuilt the tune on B13 base and will try it again. Avenir code had a lot less fuel in a lot of areas, so I can see why it would be complaining.