Couple questions regarding tuning

[tay97gst]

(Mods in Profile)
I'm attempting to idle tune my setup and am running into a few problem areas. First thing is that I can't get airflowperrev to be lower than ~.40, I've made changes to deadtime and MAFcomp but none really seem to effect it. Will having airflowperrev this high hurt anything, or is it an indication of something wrong?

Another thing that's weird is that if I rev to over 2k rpms while idling, I hear a beep that comes from the MAF. I haven't found any information on this so I'm a bit stumped on why it's doing that. Any idea about this?

I've included a log that has a few times where i rev it so you can maybe see whats going on. I'm sure there are plenty of things more that are wrong with my tune so let me know if you see anything really weird.

 

[tay97gst]

Any input on either?

 

[c2ypt1c]

Any input on either?

With 272 cams, it's typical to experience higher airflowperrev (around 30 gm/rev), but 40 gm/rev seems a bit high. Try bringing your 0, 50, 100hz mafcomp sliders down to zero and post another idle log.

 

[tay97gst]

With 272 cams, it's typical to experience higher airfuelperrev (around 30 gm/rev), but 40 gm/rev seems a bit high. Try bringing your 0, 50, 100hz mafcomp sliders down to zero and post another idle log.

alright, the only reason they're up so high is because that's what MAFcomp adjust recommended and it brings down CombinedFT down to 0%. If bringing down the MAF sliders does lower airflowperrev would I have to mess with deadtime in order to get the FT's in check?

 

[c2ypt1c]

If bringing down the MAF sliders does lower airflowperrev would I have to mess with deadtime in order to get the FT's in check?

Yes! This is what idle tuning is all about. Get airflowperrev within spec while maintaining combinedft (close to zero). But, for idle tuning, focus on short-term-fuel-trim(stft), then afterwards, reset the fuel trims

BTW, not to play mod or anything, but this should be in the tuning/ecmlink sub-forum...

 

[tay97gst]

Yes! This is what idle tuning is all about. Get airflowperrev within spec while maintaining combinedft (close to zero). But, for idle tuning, focus on short-term-fuel-trim(stft), then afterwards, reset the fuel trims

Alright thanks man, I'll post up another log tomorrow seeing if I can get airflowperrev in check.

 

[tay97gst]

Well guys I played with MAFcomp and deadtime and got airflow per rev down to about .30 while keeping combinedft at around 3. My concern is that I had to raise deadtime to 500 in order to get there, is that ok? Would it be a bad idea to keep adjusting MAFcomp and deadtime to get the airflow per rev closer to .25 or should I be ok? Once again let me know if there's anything else wacky that you see.