HP Tuners primary VE
HP Tuners primary VE Ok, I am trying to follow the tuning 101 guide, i scaneed for 30 minutes after resetting the fuel trims and everything. I recorded my ltft and i had quite a few cells up around 4, 5 and some at 6. I added the positive ones to the corresponding cells in the ve table and then flashed the new tune and scanned the car for about 3-4 minutes and all the values in the histogram at least doubled. They are all 10 to 12 now, in just about every cell. Do i have to scan the car for longer, or did i do something wrong?
Now copy every other row from the primary to the corresponding secondary VE table row. Once you have it all copied, DO NOT SMOOTH the table. This will keep the same transition between cells as the primary table.
What does the secondary VE table do? and do not smooth the secondary or primary? or don't smooth either? I drove around for about 30 minutes and it looks like they are going down slowly. The stft is right on as far as the numbers i was hoping for in the ltft, but i don't know if i was supposed to reset the fuel trims again before flashing the new tune to the vcm. I didn't, so would that be why the ltft is not where i wanted it to be?
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TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
Correct, if you're running SD right now, don't use the data you just collected. Copy Primary to VE (every other row) then log... the secondary table is only on 98-00 F-Body PCMs (not sure about Y-Body's) and only used when you're in failover I believe (SD)
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Verdad Gallardo Make the changes to your primary VE table, smooth out the table, then copy the corresponding rows to the secondary VE table and do not smooth the secondary table. If you have done one session only, just copy the needed rows to the secondary VE table and work from there. If you have made several sessions/tunes, then you need to start over. On 1998-2000 model cars, when the MAF is disabled the ECM runs on the secondary VE table. It has less resolution then the Primary. GM later figured that they can do all of the tuning with one VE table, hence why the 2001-2002 cars only have a primary VE table.
Yes, i only replaced the tune once, and that was after i added the ltft values to the primary ve table. So i made the changes and im going to upload the tune in a few minutes as soon as the laptop is done charging. Then i will go log 15-20 minutes and see what happes. At that point, i should start adjusting the ve table again correct? At what point do i enable the MAF sensor. I noticed that the LTFT data from a scan i did with the MAP sensor enabled all values were between 19-22?
