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

[WeathermanShawn]

Len.

Did you apply the SELBENS from your last log?

Looks like they are still reading .90. If you pasted and multiplied with labels, all the values should have been near 1.00

I just ran your CALC.VE Map with the strict Filter. Looks pretty good to me...

[WeathermanShawn]

Hell, dont know why, but i opened it up on here and then again in my log and it worked just fine. Table looks not that good when pasted. I just love computers. That has been my biggest hurdle to deal with.

Zero's mean your displacement was not set (or saved) in the log file. Your other computer probably has it set-up properly..

[rpmauto]

I didnt apply the selbens to the tune. that I posted. I did after I got things working properly. The ve table looks pretty good after a little smoothing. I am using the strict filter that you have in the tutorial. Gonna storm here soon, so I wont be able to log again today and see what things are at. On the log I posted the Trims were still pretty negative though. I did compare it to last years tune with the 98 pcm and the values are getting very close to the same. I am very impressed with only 2 sessions going from a basically stock tune for a ls1 on my 402.

[WeathermanShawn]

Yes, you are making great progress. You'll have that Tune nailed down real soon.

Watch out for those storms!

[joecar]

This thread shows application of Shawn's CALC.VET Tutorial (starting from post #26), it works out very good:
showthread.php?15813-Noob-needs-help-with-Roadrunner

it shows wideband AFR being read via the PCM's EGR port, and includes a calc_pids.txt file showing show the WO2BEN pid was modified to do this.

[rpmauto]

got another quick log in tonite, it is getting real close at cruise, trims look real good. WOT air fuel is still pretty fat. But I dont think it will take too much to nail that down. I did on this last log get to do a bit of wot. I am very impressed with how good it comes around.

I did get some high areas in the ve after this log, even with the tight filter. (95kpa 4400 rpm to 6800 rpm) I smoothed them out a bit and blended the area around them. The values are not quite as high as my 98 tune in those areas. (havent done alot of wot, just this log)

How will the VE being off in the upper range affect the maf calibration. I dont want fine tune the maf, and mask a ve issue, (if in another log or two it doesnt change much.) The selbens seemed pretty close this go round. It did lean them up a bit.

[WeathermanShawn]

got another quick log in tonite, it is getting real close at cruise, trims look real good. WOT air fuel is still pretty fat. But I dont think it will take too much to nail that down. I did on this last log get to do a bit of wot. I am very impressed with how good it comes around.

Actually Len, I would consider this a pretty good log. To me PE Mode/WOT fueling look pretty good. .96-.98 Bens are pretty good!

I did get some high areas in the ve after this log, even with the tight filter. (95kpa 4400 rpm to 6800 rpm) I smoothed them out a bit and blended the area around them. The values are not quite as high as my 98 tune in those areas. (havent done alot of wot, just this log)

The VE Values actually looks pretty legitimate. Based on your MAF Flow, they appear to be quite reasonable. VE Values normally peak around 4800-5200 Rpm and slowly fall off.

How will the VE being off in the upper range affect the maf calibration. I dont want fine tune the maf, and mask a ve issue, (if in another log or two it doesnt change much.) The selbens seemed pretty close this go round. It did lean them up a bit.

To my eye, your VE Values appear to be within 4% of what I would compute them to be. You are pushing over 420 g/s of air. Your VE Values should be ~ 110%. So if it off a couple of percents, it will have NO affect on the MAF..I.E., you are doing everything correct!

Len, to me this looks like a very good Log. You can't get your SELBENS a whole lot better..1-3% at most. If you ever want to double-check the VE Table without MAF input..just fail the MAF and do a couple of CLSD runs. IMO, not necessary with this log. It looks that good.

I think you are pretty much there. Blending the VE table was probably a good idea, but your MAF, Trims, PE, and VE Values all look legitimate to me..

[rpmauto]

Shawn,
Yes I think things look real good. I am very impressed with how quick it is. (got the car tuned before my new bow.) The selbens are right on, they did lower the maf table some after the last log. The air fuel in the upper end is still rich though even though the selbens are good. My log shows in the upper end of the maf HZ it is around 11.7 or so. I will try and make another log tonite before it cools down big time round here and see what the changes did for the afr. I am kinda thinking that for just the upper end of the table that getting the air fuel spot on might be better done by using the formula I posted a few pages ago for commanded vs. actual. That has worked very well for me in the past. I will let you know how it goes. (then I can start on the idle, havent done anything with that yet.)

[rpmauto]

on a side note while I am thinking of it. I am still getting a p0106 MAP performance code once in a while. I did on initial startup after the pcm swap. I adjusted the expected map table and it was gone for a while. I wonder if lowering the ve in the idle areas has impact on that. The 98 system didnt support that code so this is a bit new.

[WeathermanShawn]

O.K., Len..

One thing to consider is that the SELBENS will have a more accurate % difference from Actual vs Commanded than an AFR comparison. When you are logging a 11.7 AFR, what is your SELBEN right at that point?

You may have already noticed, but in a high-performance vehicle when you are doing a 100% TPS WOT run, when you let off the gas at the end of the run, you get a couple of frames where the EQ/AFR is still rich (I.E. Dynamic Fueling Parameters). Hopefully the Filter excludes them, but take a look to make sure.

By the way that 408 really hauls. Must be fun!.