01 tahoe 5.3 supercharged 42 lb injectors
2 bar map and LM1
started my VE tuning
Running SD per instructions found here
My scanner logs show-
-2 LTFT
-1 error%
14.6 AFR
So I cut/paste multply % to VE table
Flash and re log
6 times later still show -2 LTFT and -1 Error
My VE table keeps getting lower and PE is way rich after 110 KPA
What am I doing wrong-did not save log files but is as explained.
Thanks
Attachment 5276
Last edited by cfar; 04-14-2007 at 06:51 PM.
I think that we will need to see a log file as well as your HP scanner config file. Did you disable your LTFT's and STFT's? Also be sure that your Histogram is setup correctly in the scanner as well. Thats all I can offer, I am new to this as well.
2004 Chevy Silverado 2500 LT SB CC 6.0L Radix with 2.9 pulley, CAI from Summit, Z06 Cam, Flex-a-lite fans and Pacesetter Long tubes with dual 3in pipes.
are you using a wideband to tune or just trims?
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"
also I assume you've physically unplugged your maf sensor since you still have your maf failing at nearly 15000hz in the editor?
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"
Hi William-thanks for the replyOriginally Posted by foff667
yes I am using my LM1 for logging
and
No did not unplug maf-has iat
Do you think I need to relocate the IAT?
Maybe I need to reset fuel trims after each log?
Don't know
set it up per your help file-
http://www.hptuners.com/help/vcm_edi...to_user_sd.htm
Last edited by cfar; 04-15-2007 at 12:18 PM.
well if you didn't unplug it & thats your tune, your not in SD.
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"
So even though MAF is set to zero it can still work.
Or just unplug MAF and no IAT signal is sent or need for SD tuning?
Last edited by cfar; 04-15-2007 at 12:57 PM.
where is maf set to 0 in that tune?
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"
In the tune above, your maf is failing at 14000+. In engine diag, airflow, maf fail high, should be zero.
I would start with something like this...OLSD & roughly 11.7:1 at wot.
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"
Sorry William-My Bad...
that is when I set it back to normal
Will try yours on the drive home from the beach now
Thanks
yeah, but you shouldnt reactivate the maf when your running a 2 bar SD operating system no matter how you cut it
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"
The only reason I was reactivating the MAF was because of what I have read up on.yeah, but you shouldnt reactivate the maf when your running a 2 bar SD operating system no matter how you cut it
here is what EC tune said...
>Now to add more fuel to the fire, the 1/2/3 bar Enhanced operating systems do away with the secondary VE table and keep the Knock Learn Factor active with the MAF disabled. However you don't HAVE to leave the MAF disabled with 1 bar (or 2 or 3 bar for that matter). The MAF works kind of like a filter for the VE table so that the final AFR is a little smoother.
and 2000c-5...
After this, reset the MAF fail back to 14000 (leave everything else as is for now) and do the same thing for the MAF tables using MAF vs Output Freq (Hz) histograms instead of the VE histograms.
Am I wrong hooking it back up ???
I am confused now
Last edited by cfar; 04-16-2007 at 09:10 AM.
EC Tune would have to explain what he meant there as I have not experimented with our 2 or 3 bar & still using maf, but as stated in the help file
"2 Bar MAP - Speed Density (GenIII V8) This enhancement contains the following features:
apparently Rick at synergy has messed with running maf with our 2 bar as well so you've got a couple of references that may have done it with success...but those operating systems were never MEANT to run maf.
- 2bar MAP sensor support (calibration capability for GM 0-5V linear MAP sensors)
- Extended Main VE table to 210kPa (2bar)
- Retains full 5 kPa resolution in non-boost regions (most calibrations)
- 5 kPa resolution in boost regions (most calibrations)
- secondary VE table not used (if applicable)
- New MAP referenced "Boost Enrich" table
- New openloop MAP threshold
- Dual (High and Low Octane) Spark table support
- Speed Density mode only"
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"
OK I'll do some more research
But with the MAF out when i hit boost or pe it goes flat lean -no power
with the maf on it works ok
The main reason to do away with the MAF is because you have it maxed out.
If you're not running off the end of the MAF frequency vs Airflow table, then you "can" use MAF. Just make sure you do a FULL VE tune first before enabling MAF. If you log MAF Hz and you run past 12000 Hz while VE tuning, don't bother enabling the MAF.
Always Support Our Troops!
OK I'm game-
So what is your best way to do a full VE(link) as that seems to also be a matter of preference in the posts.
I am so far out of wack now I will have to start over due to truck running so poorly-I am starting to think I did not need to go 2 bar OS with 8 psi.
Thanks
Frank
If you exceed 12000 Hz you require 2 bar.
Always Support Our Troops!
To answer the original question "Help-LTFT keep asking for less fuel", this is because when you tune via the wideband you need to disable the fuel trim and closed loop operation. As well as DFCO and COT. The tutorial you referenced was missing a couple of steps (from your other post).
Will Do
I though I did that but will make sure right now and will post logs at the other post for all who will help
thanks
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