VE when does it make a difference? 3800

[Phantom]

Yesterday when looking at a different tuning program I saw an interesting table or feature. It had the option of setting transient fuel to 00=None 01=MAF failure mode and 02=VE based.

This got me thinking some people claim that a VE tune helps others have stated that they can set VE to 0 with no change. I would like to see if this option has any effect on when it helps or makes no difference.


What I need to for others to reply letting me know if VE makes any difference in tuning for them and what model, year, and OS id.


This will take me a while as I will need to find an uncompressed .bin file to check the status so if you have a .bin of you tune E-mail it to me.

Thanks for the help and I hope that this can shed some light on why it seems to help at times.

[viper04af]

its seem with RWD cars at least 1997 and 1998 = no diff 1999+ it matters

[Phantom]

I am did some testing yesterday have not reviewed the data to see what changes scanner read.
I created 8 Tunes to load
Transient Fuel set to OFF with VE at 0,100,200 and tuned VE.
Transient Fuel set to ON with VE at 0,100,200 and tuned VE.


I then proceed to load each tune clear the trims then start logging and start the car allowing it to idle for 2min. (The hood was open and fans were turned on via VCM controls, all other electronics were off for the test. Intake temp was ~68 and ECT was ~135 for all starting tests.)

Preliminary results:
Car started on all tests.
Issue running VE at 200(max) both with/out transient enabled car would idle for ~35sec then would stumble and die I believe from to much fuel. (No big surprise since the VMC uses VE for OL and the car was not in CL yet.) The car could not restart after this happened and the tail pipe dumped a little smoke when it happened.


Next I loaded each tune after warming the car up and went for a spin.

The procedure I took when doing the test was unplug the inverter then load the tune in a school parking lot, plug inverter back in clear Fuel trims and dissable LTFT. Then I would turn out of the parking lot drive down to the light and start the scanner (That way I was sure it was in CL). I would start a roll into WOT cruse at ~58mph coast down to ~38mph then do a little city driving back to the school to start the next run the drive was about 5min long.

I did not test VE of 200 since it did not idle. Also did not get to test Transient OFF with VE at 0 but when I ran Transient ON and VE 0 the car died after I started the cruse portion of the test. The car would not restart in when rolling or after I stopped had to load a different tune on the side of the road.


If I have time later today I will review my scans and see what results it gives me.

[viper04af]

cool keep us posted

[Phantom]

I have not finished this yet but I have attached a ZIP that contains my scans, HPT Config file for beta HPT, Tunes, Scans and scana as .cvs, and a little excell sheet. (I forgot that I had used the beta for tuning the files I have resaved the changes with HPT version 2.22 just for "Transiant YES VE Tuned" and "Transiant NO VE Tuned" files.)

http://patientchoicecardiology.com/c...ientVETEST.zip 4.72MB
(Patient Choice Cardiology is my place of work an I am just using it to store the ZIP.)


I did not get the best scans as WOT was not consistant on all runs BUT all runs locked at 0 Fuel Trims and O2s stayed close to 930mV. I will need to find a place I can easily enter I-75 to do some 0-75MPH testing, but not sure when I will be able to do that.


The order of the runs were as follows:
Transiant YES VE Tuned
No KR But I need to rerun the test as I did not get into TPS quick enough.

Transiant NO VE Tuned
Spikes of KR at +33% TPS.

Transiant NO VE 100
Small KR spike near end of WOT LTFT went active on this scan also.

Transiant YES VE 100
Spikes of KR at +33% TPS.

Transiant YES VE 0
The RPMs jumped up during WOT then suddenly went back down. The car dies at frame 243.




I looked up the OS IDs that TinyTuner should have Transient Airmass Calc Mode available. (The issue with TinyTuner is it only supports editing 3800s and it has to use .bin files)

TOTAL OF 140 OS IDs should have the table available and are listed below:
(Note: I'm to lazy to set a table up to display each row so a space signifies the break.)
-------------------------
OSID MapNumber YearModel
9355202 93 1997
9355440 93 1997
9359758 93 1997
9364943 93 1997
9383352 93 1997
16243643 93 1997
16243648 93 1997
16243817 93 1997
16252957 93 1997
16252960 93 1997
16252961 93 1997
16252965 93 1997
16254333 93 1997
16254718 93 1997
16257725 93 1997
16266326 43 1998
16266449 43 1998
9352682 99 1998
9352797 99 1998
9352801 99 1998
9352806 99 1998
9352809 99 1998
9352820 99 1998
9352823 99 1998
9357127 99 1998
9357128 99 1998
9365037 99 1998
9367747 99 1998
9369193 99 1998
9379800 99 1998
9384500 99 1998
9384505 99 1998
16268296 99 1998
9367321 98 1999
9369232 98 1999
9369395 98 1999
9371626 98 1999
9371627 98 1999
9372327 98 1999
9372328 98 1999
9372362 98 1999
9372363 98 1999
9376661 98 1999
9377385 98 1999
9377388 98 1999
9377399 98 1999
9369403 99 1999
9370647 99 1999
9374958 99 1999
9374960 99 1999
9386577 99 1999
9386578 99 1999
9386582 99 1999
12214379 99 1999
9384013 49 2000
9384046 49 2000
9384048 49 2000
9384050 49 2000
9384051 49 2000
9393580 49 2000
9393581 49 2000
12203795 49 2000
12203798 49 2000
9389670 94 2000
12201687 94 2000
12201822 94 2000
12201830 94 2000
12204288 94 2000
9389716 97 2000
9389750 97 2000
9389753 97 2000
9389759 97 2000
12201445 97 2000
12201460 97 2000
12201462 97 2000
12201463 97 2000
12201465 97 2000
12201467 97 2000
12201468 97 2000
12201470 97 2000
12201785 97 2000
12201786 97 2000
12201788 97 2000
12201791 97 2000
12201792 97 2000
12201795 97 2000
12201803 97 2000
12202881 97 2000
12202882 97 2000
12202942 97 2000
12203659 97 2000
12214712 97 2000
12207879 95 2001
12211511 95 2001
12215590 95 2001
12215602 95 2001
12202941 97 2001
12592070 99 2001
12203793 49 2002
12218863 96 2002
12223447 96 2002
12223448 96 2002
12223450 96 2002
12223451 96 2002
12223456 96 2002
12223458 96 2002
12223461 96 2002
12223462 96 2002
12223463 96 2002
12223492 96 2002
12223493 96 2002
12578500 96 2002
12581471 96 2002
12586837 96 2002
12588234 96 2002
12580150 47 2003
12580151 47 2003
12583338 47 2003
12583339 47 2003
12583340 47 2003
12583378 47 2003
12580139 87 2003
12580143 87 2003
12583342 87 2003
12583369 87 2003
12583373 87 2003
12583374 87 2003
12583433 87 2003
12596629 39 2005 Open Loop AF Offset RPM vs CylAir Transient ONLY
12596630 39 2005 Open Loop AF Offset RPM vs CylAir Transient ONLY
12596631 39 2005 Open Loop AF Offset RPM vs CylAir Transient ONLY
12583382 87
16252966 93
12223438 96
12223488 96
12223496 96
12201457 97
12201796 97
12201866 97
9376662 98
9352737 99
9365036 99
9379801 99