Tuning VE and WOT?

[nitrousgp]

Is there a write up somewhere of how to properly tune VE and WOT? I have a PLX wideband.

[5_Liter_Eater]

Are your VE #'s ~100's or ~1,000's? If they are in the 100's it's easy.

Fail the MAF, disable closed loop and plot % AFR Error against the VE table. log, copy, paste special (multiply by %) into the VE table, copy every other row of the primary VE into the secondary VE if you have one, re-flash, relog.

[nitrousgp]

Is this just for tuning the VE or both? Or is VE for WOT also. Sorry I'm a newb. :P

When you say fail the MAF, am I just setting the failure freq. to like 100hz?

[5_Liter_Eater]

With a WB you can tune the VE and/or MAF throughout the range. No need to stay off the throttle.

I asked about what your VE numbers looked like because if they are ~60-100 then its super easy but some PCM's have the VE numbers in the thousands so you can't just copy and paste the % AFR Error and expect it to work.

Yes, to fail the MAF set the MAF Fail frequency to zero and make sure the P0103 (MAF sensor circuit high) DTC is set to MIL on first error.

[JFDugal]

to fail the MAF set the MAF Fail frequency to zero

I don't think the Grand Prix guys have this parameter (I don't see it in my bins), so you'll need to physically unplug the MAF sensor.

[caspernicus]

I don't think the Grand Prix guys have this parameter (I don't see it in my bins), so you'll need to physically unplug the MAF sensor.

click 'Engine Diagnostics' then 'Airflow'

[JFDugal]

Hmmm . . . I'm not seeing anything under that tab. At least not with the GTP bins I have.

[iGoRa]

its there

[Bandit gs]

Yup, engine diagnostics, airflow, you'll see it is set to 11500 right now. It is the only thing under that tab, type in a zero and save the file. THen copy your high octane table over to your low octane table, upon maf falure your computer will divert to the low octane table. For tuning VE though you want it to see high octane numbers.

[skalor]

Actually the MAF fail value is not accessable in GTP binary. I couldn't find it in my binary and tried a bunch of other binaries. It just wasn't there. I had emailed Bill from HPTuners about it and there's an update to fix it in 2.2.

[nitrousgp]

I went out tonight and did a few scans. First scan said the AFR error were pretty much +14 throughout the board. The next two scan were both +10. It seems like I'm dumping in too much fuel. Am I doing something wrong?

-Fail MAF
-Copy and Paste High Octane table to Low Octane
-Disable CL
-Log
-Save
-Copy/Paste Special %
-Relog

[5_Liter_Eater]

Make sure the MAF is failed. Check to see that the DTC is being set. Set it to MIL on first error.

[nitrousgp]

Yep, I checked to make sure it was set each time (P0103) and it was. I could also tell when the MAF was failed because if I gave the car any gas and let off it would barely stay running after that. Almost like there was too much fuel.

[5_Liter_Eater]

I donno why your numbers would not be coming down then. Cen you post a before tune and log and after tune and log?

[shor0814]

Actually the MAF fail value is not accessable in GTP binary. I couldn't find it in my binary and tried a bunch of other binaries. It just wasn't there. I had emailed Bill from HPTuners about it and there's an update to fix it in 2.2.

Using 2.2 here, and no MAF fail value, actually nothing under Engine Diagnostics except DTC codes.

[Bandit gs]

unplug the maf, you're only option.

[skalor]

Using 2.2 here, and no MAF fail value, actually nothing under Engine Diagnostics except DTC codes.

Same here after I actually looked for it.

[nitrousgp]

That's odd. I have the MAF Failure Value under Engine Diagnostics in my file. Although I was using 2.1.18 software.

[GTPNoga]

On the 04 GTPs the Intake Air Temp sensor is integrated with the MAF sensor. Will disconnecting the MAF and having the IAT out of service affect the tune?

[johnh]

I tuned my VE by disconnecting the MAF, it didn't seem to affect it too much.
(I don't have the Fail Param even on 2.20.

With a WB you can tune the VE and/or MAF throughout the range. No need to stay off the throttle.

Make sure though you don't change your PE settings...(some of the VE tuning guides tell you to set PE enable TPS to 100% so you don't accidently go into PE when VE tuning with the NB).