Calc.VET: correcting MAF and calculating VE (in single log)

[SSpdDmon]

...your original Tune from a few weeks ago..Gettin Goin SSdemon..

Huh??

[WeathermanShawn]

Morning Jeff:

Your work is still pretty popular here:http://forum.efilive.com/showthread....l=1#post140778

[SSpdDmon]

LOL - I was reading new posts and was thinking, "Oh man - what'd I miss???"

[rpmauto]

yea, I use your idle stuff, works great. (named the tune that so I knew what was done) So far with this tune I have just done your changes and havent done RAFIG yet. Wanted to get the VE dialed in. But it is doing great. (after I changed the map predicted tables)

Shawn, last nite I did some smoothing to the maf table and I was thinking of doing the same thing. I think with me forgetting the cat disable that we got too much bad data. The ve looks to be good. I get a large hump around 95 kpa, I tried smoothing it, but it just comes back each log with wot. So I will leave it and just round it off and blend it into the higer rpm area.

The temps dropped of last nite to the 40's here, and they are talking rain. Dont know when I will log again, but I will make the changes to the maf table and let you know how it goes.

Len

[joecar]

Hi Len,

Log in post #230: that's a very interesting log, engine is pulling in a lot of air.

During WOT, observe these things:
- positive LTFT's as Shawn said;
- DYNCYLAIR_DMA (from VE) diverges from CYLAIR_DMA (from MAF);
- VET (corrected) and VEN (uncorrected) diverge (both are calculated from MAF);
- SELBEN ranges as low as 0.915;

those indicate that the MAF table is not correct.

paste the VET map into B0101 and paste-multiply the MAF BEN map into B5001 and take another log.

MAF waveform looks ragged thru-out range... PCM filters/averages MAF, but you may be able to help it if you rearrange the intake plumbing... do you have a pic of the engine bay...?

The Calc.VET tutorial requires (in addition to NBO2's being good) MAF signal to be good... notice the MAF waveform jaggedness shows up in the CALC.VET waveform.

[joecar]

Hi Jeff, how's it going

[WeathermanShawn]

Len, I had no idea CAT PROT even adversely affected closed-Loop. I knew about PE Mode, but thats the first time I have actually seen the value 1.25 actually logged.

Yes, it messed with out Tune, along with some of the issues Joecar addressed.

With better weather, lets start with the B5001 suggestions..

[rpmauto]

I have made the changes to the maf table. As soon as the weather is better we will see what happens. I did also notice the jagged maf in the log. Looked at some of last years and it was the same. The intake piping is good. Don't know what would be causing that.

[WeathermanShawn]

I have made the changes to the maf table. As soon as the weather is better we will see what happens. I did also notice the jagged maf in the log. Looked at some of last years and it was the same. The intake piping is good. Don't know what would be causing that.

Screened or De-Screened MAF?

About every 2-3 months I spray some approved MAF cleaner in an around the wires.

Its hard to say, that 408 may just be pushing a lot of air. You hit Max MAF Freq a few times..

[rpmauto]

Maf is a z06 85 mm so factory no screen. New delco unit last year.

It should move a lot of air, mamofied AFR 225's 12:1 comp, good sized cam. Though it really hasn't run the times at the track it should. It should go tens on motor this year low tens on spray. Full weight.