helly

Yes ofc.

The fuel table is ok tuned. So is cold-start, idle etc.

I'm still having the problem with lean hot starts! Yesterday I removed the crossover tube and started test fitting IC piping. I had the hood open and the crossover tube removed from the engine bay for two hours. The IAT is located in the crossover tube (plastic). I reconnected it and started the car. I went from 13.5 AFR on my cold start to 18 AFR. And it stays there until I start driving.

This is quite annoying. I think I added the MAT correction last yeast. Doesn't seem to make any difference (https://www.miataturbo.net/megasquir...-starts-79109/).

I've read that this is because of heated injectors. But two hours and open hood should cool them down? The drive before I stopped was just 10 minutes.

Any ideas?

Here is a log I started after I drove 20 seconds to get the AFR to stabilize. I'll log a hot start next time.
http://px08.net/mx5/2016-04-17_14.02.40.msl
My currenttune. Renamed.
http://px08.net/mx5/CurrentTune-helly.msq

Braineack

iTrader: (62)

you need to do the MAT corrections inversion table.

you log shows you're down 5-10% of fuel due to Gair.

helly

I'm pretty sure I added a MAT / CLT correction table from one of your post. Can't remember where or how.

helly

This is what I added last year.


Ref: this post: https://www.miataturbo.net/mspnp-55/...n-table-75095/

Braineack

iTrader: (62)

looks like you need to bump it up a bit more.

watch your Gair and Gammae. Gair is air based corrections, and gammae is total.


you want to make that curve net you 100% Gair across all temps. Then after you've perfect tuned your fuel map, you'll adjust that curve to keep the AFRs in check in extreme temps.

helly

Thanks. So 90% gair = 10% less fuel? And 110% gair = 10% more fuel?

If so. Eureka. If I compare Gair and MAT in the logs: When the temperature goes up, gair% goes down.

Gammae and Gair seems identical in the log. Is that correct?

Thank you so much for taking the time educate a noob.

Braineack

iTrader: (62)

yup.

helly

I added 10% at 71C and 93C



I went for a long drive and these are logs from me stopping at the shop. Gone about 10 mins. The later one is from me stopping to fill gas. max 5 minutes. Same problem. GAIR is about 93 and AFR 18 -19. CLT: 79C (159.8F) MAT: 37C (98.6F) .
http://px08.net/mx5/2016-04-18_18.39.26.msl
http://px08.net/mx5/2016-04-18_18.55.25.msl
http://px08.net/mx5/CurrentTune-helly2.msq

Braineack

iTrader: (62)

where is your AIT sensor located?

helly

In a plastic tube near the intake. After the Supercharger.

Erh.. I mean, near the intake manifold. Not the "intake" as in the airfilter.