Ok I'm trying VEM for the first time, but I'm missing something here. I've got my Datamaster file, my .bin and everything seems to be working fine but VEM doesn't change anything...

Literally, it just multiplies the VE values by 1. Where did I take the wrong turn? I have verified in tunercat that the .bin is not being changed.

I have the Datamaster file here:
http://lonestar.texas.net~drews/efi/new1.uni

and the .bin is here:
http://lonestar.texas.net~drews/efi/10002.bin

and the VEM text output is here:
http://lonestar.texas.net~drews/efi/10002_vem.txt

Anyone?

Thanx,
Drew
'89 IROC L98/M6

 

Argh!

Sorry folks,

http://lonestar.texas.net/~drews/efi/new1.uni
http://lonestar.texas.net/~drews/efi/10002.bin
http://lonestar.texas.net/~drews/efi/10002_vem.txt


Tnx,
Drew
'89 IROC L98/M6

 

the .Bin IS the changed file. I have not asked George what the .TXT file is for. I suppose that when he created it (for his LT1 car) it worked as a file of items changed, but it does not seem to work for the 8D (the one that I use).

BW

 

Ok, VEMaster is making adjustments to your .bin file but only in cell 4 because that's the only cell you're running in. Apparently it looks at each cell and matches MAP and RPM then makes adjustments. Using your files and letting VEMaster adjust the full range of possible RPM's it does make adjustments but only at idle RPM's. Look at the end of the TXT file and you'll find:

0: 0 map: 0 - 25, rpm: 0 - 700
1: 0 map: 0 - 25, rpm: 700 - 1200
2: 0 map: 0 - 25, rpm: 1200 - 2000
3: 0 map: 0 - 25, rpm: 2000 - 7000
4: 2681 map: 25 - 50, rpm: 0 - 700
128/137.464/160
5: 0 map: 25 - 50, rpm: 700 - 1200
6: 0 map: 25 - 50, rpm: 1200 - 2000
7: 0 map: 25 - 50, rpm: 2000 - 7000
8: 0 map: 50 - 80, rpm: 0 - 700
9: 0 map: 50 - 80, rpm: 700 - 1200
10: 0 map: 50 - 80, rpm: 1200 - 2000
11: 0 map: 50 - 80, rpm: 2000 - 7000
12: 0 map: 80 - 104, rpm: 0 - 700
13: 0 map: 80 - 104, rpm: 700 - 1200
14: 0 map: 80 - 104, rpm: 1200 - 2000
15: 0 map: 80 - 104, rpm: 2000 - 7000

All of your data collected was from cell 4 and that range is only from 25-50kpa, 0-700RPM.

The reason for being stuck in cell 4 is because you've set the Canister purge MAP disable and Canister purge MAP enable to 0 in your ECM constants. When you do that it locks the cell to 4 in other parts of the .bin file. Set them back to the factory settings and you'll use most of your cells again and VE should make adjustments.

I've tried a few ways around this with the standard .TDF file but eventually quit and just left the settings alone since it didn't seem to matter and the solenoid isn't there anymore anyway.

I've looked at the hack and someday, if it really matters to me, I'll figure out a way around the Canister purge cell 4 problem, like I did the max idle at 800 in drive. I modified the .TDF file and can now set idle where I want it up to the limits of the IAC valve (about 1200). I use it to stay in closed loop with open headers, while still in gear.

I see you're tuning a 383. Me too. What cam you running to get only 55kpa at idle? I'm changing cams soon and just want to compare.

Let us know how it works out. I haven't read much about VEMaster for the 8D but I've found it to be a lot quicker to get into the ballpark with it. About 10 scans of data from driving around and it's closer than all the other methods I've tried.

Oh, and it helps to set your TSP threshold for power enrichment way up while your doing this. Just don't forget to set it back when you get to tuning the WOT stuff.

BTW, you need to get rid of that DTC error, it seriously messing with your timing. You have a considerable amount of knock retard!

 

Smasterson,

Off the original topic but I thought I would post my 383 cam readings. I idle at 65kpa. I am running a xtreme solid roller 248/248 630 lift with 1.65rr's.

I use diacom so VEmaster will not work for me yet. MAybe he will make a addition for diacom users

bowtye

 

Ok, I'm still lost on where you are seeing this info in the 10002_vem.txt file? I'm not even seeing that rpm/VE range anywhere in the .txt?

As far as the cell 4 stuff goes, that apparently is the idle cell and it's my only cell right now because I have no VSS input, yet. I'll be working out my t56 VSS issues this week. Maybe that will help eliminate the rest of my variables. As far as I know the CCP stuff hasn't been touched, though you say it differs from stock?

No 383, just stock L98 short block, heavily ported vette heads, LT4 Hot cam, and a stealth ram manifold.

The DTC was leftover junk from setting my base timing, the knock retard is likely from the lean mix. I had no knock with my old TPI program and 108 BLMs

Thanks for taking a look guys, I'm way behind on my tuning chores here, but I'm getting back up to speed, hopefully I can figure VEM out and spend more time FINE tuning rather than chasing loose BLMs.

Drew
'89 IROC L98/M6

 

As I said, I let VEMaster adjust the full range of RPM's and this information is at the very end of the TXT file. There is a newer version available so maybe that's the difference.

Oops! Some of your CCP setting are different than mine but apparently 0 is the norm for those two settings.

 

I've got an old way of doing the same thing as VE master but by RPM vs. MAP vs. AvgBLM instead of Driving Cell vs. Avg BLM.

One thing that presents a problem with VEmaster is it doesnt' seem to touch on cruse or idle. In fact it doesn't touch idle at all. -- thats coming from the author.

I found this by using VEmaster to get my new injectors tuned in the day of race day and wondering why my BLM's where not changing at idle

Its a great program that really cuts down on tuning time but its not versitile enough to completely take over tuning.