Calc.VET: correcting MAF and calculating VE (in single log)

[joecar]

Fix this:

Out of Range calibration summary: 04:00:37 am, Friday May 22, 2015

Engine Calibration.Abuse Management
{B1207} Abuse Management Vehicle Speed Threshold, was out of range when loaded.

[joecar]

Is your FPR manifold-referenced or un-referenced...?

[LastCall]

Thanks for the quick response Joecar!

Post some screenshots.

On the PIDs tab, do the pids CALC.VET and CALC.VEN have red X thru them...?

No they don't, see screen capture below:

Hmmm, CALC.VET data looks wrong... MAF data looks ok.

Need more data, drive around the block.

Okay, I'll do that. I did the math on a calculator and couldn't get it to line up either.

One thing I noticed, the temps dob't look right. The dynamic (DAT) air temps are negative and/or really low. But the IAT sensor looks accurate. Weird.

Fix this:

Just did - thank you.

Is your FPR manifold-referenced or un-referenced...?

Vacuum in not-referenced. Using a corvette-fuel filter a few feet off the tank with a single line to the rail.

[joecar]

...

One thing I noticed, the temps dob't look right. The dynamic (DAT) air temps are negative and/or really low. But the IAT sensor looks accurate. Weird.

...

Vacuum in not-referenced. Using a corvette-fuel filter a few feet off the tank with a single line to the rail.

If GM.DYNAIRTMP_DMA pid is returning bad values, then for now use (temporary solution) IAT in place of DAT, and do take a look at how to create the pid CALC.B4901 in the Calc.VET thread.

Ok, so your FPR has no reference hose going to the manifold (or any source of vacuum and/or boost).



I see it in your log, your CALC.DAT being wrong is causing bad CALC.VET.

[LastCall]

If GM.DYNAIRTMP_DMA pid is returning bad values, then for now use (temporary solution) IAT in place of DAT, and do take a look at how to create the pid CALC.B4901 in the Calc.VET thread.

Ok, so your FPR has no reference hose going to the manifold (or any source of vacuum and/or boost).

I see it in your log, your CALC.DAT being wrong is causing bad CALC.VET.

I found the calc_pid text file with 4901 and replaced the old calc_pid file. That seems to have fixed the DAT.K temp issues. However, the values still seem really low. Based on the LTFTBEN, I should be multiplying the values by 1.05-1.10 (increase of about 10%). However, on the BEN calculated VE, I should reduce the values by about 25%. See screen capture below:

[LastCall]

Here is the VE table I was reffering to when I was comparing the calculated values in the MAP and the values in the VET table.

[joecar]

You haven't applied the transient filter... but I don't think that's the problem.

How is the MAF table coming out, post a pic of it.

[joecar]

You show two maps:
1. VET [g*K/kPa] x MAP x RPM,
2. LTFTBEN [%] x MAP x RPM,

are you calculating the VE or are you correcting it...?

[joecar]

Is your IFR table correct for the injectors...?

You said FPR is un-referenced, right...?

Measure rail pressure (in psi) at idle, and observe pressure as you snap throttle open and then shut... what did rail pressure do...?

[LastCall]

You haven't applied the transient filter... but I don't think that's the problem.

How is the MAF table coming out, post a pic of it.

I added in the filters and the changes were minimal.

Pic of MAF MAP:

You show two maps:
1. VET [g*K/kPa] x MAP x RPM,
2. LTFTBEN [%] x MAP x RPM,

are you calculating the VE or are you correcting it...?

I was trying to show that the correction shows to add between 5-10% to the VE table. And the calculated numbers in g*K/kPa suggest to lower the values in the VE table by way more than that, almost 30%.

Is your IFR table correct for the injectors...?

You said FPR is un-referenced, right...?

Measure rail pressure (in psi) at idle, and observe pressure as you snap throttle open and then shut... what did rail pressure do...?

Injector values are stock and correct.

Yes, unreferenced. Corvette fuel filter close to tank with no manifold vacuum feed.

I'll borrow a fuel pressure gauge and try to get a read as you described.