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

[WeathermanShawn]

Well I'm seriously game to working on this with you, including testing on my vehicle as well as assisting with dev work and adding documentation; lemme know.
Mr. P.

We may take you up on this offer. The basic concept would be to take an existing VE Table (stock or otherwise), put the vehicle in closed-loop..attach wideband.

The pids selected would apply the LTFT Trims or WO2 reading (BEN). The computer code will 'know' if the vehicle is in closed-loop or PE Mode. After a log, you could apply the SELBEN correction to your existing VE Table. So VE Table, Trims all in one log. And you could have an accurate MAF Airflow equivalent should need you need it.

Once we get the thread going, you might be able to help us out with a log or two?

Thanks..

[Mr. P.]

I'll start tonight. :excited:

Mr. P.

[WeathermanShawn]

For those users that want additional information on Calculating MAF Airflow from the VE Table...CALC.VET in Reverse, see this thread: http://forum.efilive.com/showthread....VET-In-Reverse

A link has also been provided on Page 1 (Appendix) of the CALC.VET Thread: http://forum.efilive.com/showthread....tire-VE-Table.

[Whipped383]

I am Running cos3 with a innovate lc1 wideband any tips you can give me on doing this with E10 fuel that I have in my area? Currently I use a ben spreadsheet that calculates for the E10 can that still be used?

[joecar]

Hi W383,

Buy a test kit which measures alcohol content in gasoline ($30), it has a chart showing stoich AFR for alcohol %.

True E10 (exactly 10%) has stoich AFR 14.12.

Edit B3601 to be the stoich AFR of your fuel.

Then log GM.EQIVRATIO and EXT.WO2LAM1 (you need a null modem serial cable between LC-1 and V2), the BEN correction is {GM.EQIVRATIO}*{EXT.WO2LAM1}... see WeathermanShawn's Calc.VET and Calc.MAFT tutorials, they include calc_pids.txt files with the BEN pid.

By using eqr and/or lambda, you avoid the AFR dependency on stoich AFR [i.e. AFR = Lambda * stoichAFR ]... i.e. EQR 1.18 is sufficiently rich for PE regardless of E00, E10, E20 (if understand my Exx meaning).

You can use your spreadsheet to sanity check the BEN pid... can you post it here please.

This shows the whole point of the EFILive software: to make tuning exercise simple/easy/quick and self-contained.

[s10mods]

When i try to paste and multiply my MAF table it just maxes out most of it, am I pasting it wrong?

[WeathermanShawn]

Hard to know from that description.

Can you post a screenshot?

One thing for sure it if you do it exactly as the Tutorial has it, you should have no problem.

Its probably a digit issue, but please post up..

[s10mods]

Here are some screenshots, I must be doing something wrong cause it sure dont look right lol. Some info on the car if needed, its a 95 impala, LT1 with aftermarket heads and cam, with the 24x eficonnection system running on a 2002 computer. The first pic is the scantool, the 2nd is the tune tool before paste and the 3rd is after paste.
THanks.

[joecar]

Your map shows cell counts... it should be showing average cell value, click the x-bar (average) button, see pic attached.

Before you do the paste-multiply sanity check your cell values (they should all be close to 1.00, question any cells that are far).

Also, you can constrain the cell width, see attached pic.

[Frozen WS6]

I finally got to get a good log on my 98 after fixing a couple other issues.
Could someone refresh my memory. On my VET average map, is .98 perfect and anything above (higher numbers like 2.27) lean?