VE Table Looks Odd

[dliparoto65]

Hello all,
I have been tuning on my VE tables and it looks steep on what I am calling the low side.


2005 5.3, LM7, truck Norris cam, flex fuel injectors

Thanks in advance.

[blindsquirrel]

What flex fuel injector flows 30.44lbs?

[dliparoto65]

What flex fuel injector flows 30.44lbs?

https://www.injectorplanet.com/produ...otors-12580426

this www shows 29.9lb hr at 43.5 psi /3 Bar , not sure what the 3 bar is al about

I am at 45 psi

Corvette filter / regulator

[5FDP]

Must be a pretty weak pump to only flow 45psi. You wouldn't need the filter/regulator if you are able to keep a high power pump down to 45psi, you'd have a regulator just for that.

Past that, the VE looks just fine to me. Honestly looks like a stock table without comparing them.

[SiriusC1024]

3 bar is what they are rated at. Corvette reg is 4 bar. Despite this, 3 bar rating goes into Flow Rate vs KPa.

100% in cranking VE is incorrect.

[dliparoto65]

Must be a pretty weak pump to only flow 45psi. You wouldn't need the filter/regulator if you are able to keep a high power pump down to 45psi, you'd have a regulator just for that.

Past that, the VE looks just fine to me. Honestly looks like a stock table without comparing them.

Regulator should be 58 psi, I need to check psi again.

[dliparoto65]

3 bar is what they are rated at. Corvette reg is 4 bar. Despite this, 3 bar rating goes into Flow Rate vs KPa.

100% in cranking VE is incorrect.

Don't know what you are describing, is it the 99s in the VE table? I have not tuned WOT yet, I need to install a wideband.

[dliparoto65]

Rechecked my fuel pressure and it is 58psi.

So I need to adjust for that and start over.

[SiriusC1024]

Don't know what you are describing, is it the 99s in the VE table? I have not tuned WOT yet, I need to install a wideband.

You said low side. I didn't see anything really wrong with the primary VE low side, so checked cranking VE. Those values are too high.

[blindsquirrel]

12580426 is the L59 VIN 'Z' injector. Copy in Flow Rate vs KPA, Min Injector Pulse, Offset vs Volts vs VAC, & Short Pulse Adder tables from a 2005-up (returnless @58PSI, same as yours) VIN 'Z' truck.

whatisinjectordata.png

2006 Avalanche 3GNEK12Z46G198319 L59 12580426 35lb 58psi nonref.hpt

[dliparoto65]

You said low side. I didn't see anything really wrong with the primary VE low side, so checked cranking VE. Those values are too high.

Looking and comparing the cranking VE and they are the same as OEM.

I do see what you are saying, is this something that is tuned or just adjusted to something else?
If left as is hurt anything?

Thank You

[SiriusC1024]

Eh if it's like stock then nvm. I'm used to seeing f-body/vette VE plots. Follow the squirrel's advice.

[blindsquirrel]

At zero RPM volumetric efficiency is 100%, can't be anything less than that. Cranking speeds are generally low enough that even tiny throttle openings/IAC positions are enough air to fill the cylinders, so not much vacuum is created. Hell, most every (maybe actually every) Gen 4's cranking VE table is all 100's. Unless you have a mega-starter and a massive bank of supercapacitors and it cranks at 400 RPM or something, I don't think that table matters that much.

[SiriusC1024]

Makes sense.

[Alvin]

Hello all,
I have been tuning on my VE tables and it looks steep on what I am calling the low side.


2005 5.3, LM7, truck Norris cam, flex fuel injectors

Thanks in advance.

This looks like a great start.

If the injector data is incorrect, i didn't read the rest of the thread closely, you'll need to go back over this but this looks like you are going in the right direction

[blindsquirrel]

Despite this, 3 bar rating goes into Flow Rate vs KPa.

Only if the fuel system is actually running at 3 bar.

[dliparoto65]

I believe I have the injectors figured out, Trying to do something about my idle , IAC don't seam to be responding, idles around 800 IAC reads 309 and special functions don't do anything with the idle speed, need to make a new thread.
Thanks to all