I would start in the 0 and 1 stages, from -40° to 158°, and multiply them by 1.25. Then blend into the higher stages. If that doesn't help, then multiply the same temperature ranges in the 2-12 stages and blend upward again. It's all a guess. You won't hurt anything, but save your changes with a different name than your present tune so you can put it back if you don't like it.

 

Mine is setup a little different. I have time in secs across the top and coolant temp down the left side.

 

This is on a 2008?
Why don't you start with an E85 tune?

 

It is tuned on E85....Just having hard start when cold only.

 

Did you start with an E85 Factory Calibration?

 

No I didn't. They calculate the content. What should I do?

 

GM has used Virtual Flex Fuel Sensors since 2006 on must E85 applications.

I perfer using OE E85 calibration on all applications for tuning. If you use a VFF calibration you need to take a lot of time with this tune. You can run into an issue with the tune being off and the PCM uses the VFF software to correct the stoich for E%, but it is the tune that is off not the E%.

On your 08 all you need is a E85 calibration setup for your VCM ID and VIN. Then you will have a calibration that works like the OE truck. You can tune the normal HPT tables after that.

email me your VIN and I will look around

caleditor@pcmcalibrators.com

 

Mine was not a flexfuel. L76.

 

Is your cam locked?

 

Three bolt cam , No DOD or VVT. Basicly completely different setup. All forged.