VE tuning.....
Can someone link me to a thread or a how to for VE Tuning using HPT? I can't seem to find it. ie what to disconnect (MAF), what to scan and how to modify the table correctly.
I've been searching and I"m ready to lose it.........
Thanks!!
Just leave the VE table stock. The VE table is only used to check for a Maf failure, and for transient fueling.
Russ Kemp
According to some other tuners that have tuned the GA for many years, the VE table actually does make some differences.
Figured it doesn't hurt to try.... I've read all the posts about not doing it. I've got some time to kill, so why not
I just wanna know how to do it.
Thanks in advance!
-xon
Did some more searching, and can't seem to find a how to with HPT for VE tuning.
Anyone have a link, maybe to another website, that contains this info? I know I need to unplug the Maf, but what do i need to scan in my histo's in order to make the corrections as easy as it is to do MAF corrections? I know I'd be scanning LTFT's plus STFT's, but .....
There are some very good how-to's and I'm just looking for a little guidance.
TIA!
Set MAF fail to 0 Hz, copy high octane spark to low octane, set PE enable to 100%. Then go for a cruise logging your wideband in the VE table as well as % error. Copy and paste the error percentages until its close, then half % until its right on commanded.
My car is completely SD tuned right now and the cruise part of the VE table works like its supposed to, but anytime I've tried to tune WOT in the VE table, I get some strange consistency issues with wideband readings. I just use the PEvsRPMvsTIME table to tune at WOT now, its only in 800rpm increments instead of 400, but it works and works consistently.
1998 Pontiac Firebird
NA 3.8L V-6
[email protected], 1.65 60'
7.91@85 1/8th
Abbott Racing Heads and Engines
From what I've seen, I think it all factors in together.
1998 Pontiac Firebird
NA 3.8L V-6
[email protected], 1.65 60'
7.91@85 1/8th
Abbott Racing Heads and Engines
FWIW I wouldnt set the pe to never enable but thats me. If anything I would just drive sane & use plot filters for what they were designed for to filter out any PE cells.
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"
For VE Table tuning, why wouldn't you want to disable PE? I would think you don't want to toss in the extra fuel to confuse the VE table, as PE will add on its own, if you keep PE on, and define it into the VE table, then you will have to change PE fuel quite a bit to pull fuel out.
I disable DFCO and PE and go drive to work on hitting every cell and then come back and define it, and then restore DFCO and PE once I am happy with it.
Originally Posted by Bill@HPTuners
if your at 4000rpms & 105kpa map to you really want to be aiming for 14.7:1?
Its unrealistic as well as potentially dangerous to leave PE off.
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"
Agreed, but I guess I don't nail it at all when I do it, I might get into the throttle some, but I do keep an eye on the datalogger too for knock counts.
Not sure on the plot filters, my tool (TunerCat OBD1) doesn't have, I use Excel and manually work the tables over. Then where I don't get, I extrapolate and go from there....
The filters are great. For me, I've set it to filter out any cells in which commanded afr <> 14.7. All my adders are zero'd out so the only time i'm commanding 14.7 is when I'm not in PE.
The end result is a listing of values when not in PE.... your way works too, just this way, in case i get a little stupid and stab the throttle, I don't need to worry about going lean. Obviously, I will still need to be gentle on the throttle, or AE and DE will cause some weird results
Another question as I am going through this. Should I disable AE and DE before beginning my scans? It seems to me that even slight changes in TPS, would aggrivate the readings.
If so, how exactly do I disable these?
AE:
Enable TPS delta: set all to 100%
Disable TPS delta: set to 100%
Re-enable TPS: set to 0%
DE:
Enable TPS delta: 100%
Disable TPS delta: 0%
Thanks!
-Tim
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