Flex Fuel Tuning for 2009 C6 Z06 (LS7)

Hey All,

I am very new to HPT, but I was having some issues/questions about why the PE EQ Ratio (Alcohol) table is not showing up in my VCM Editor. I have enabled Flex Fuel and Sensor on the Fuel tab. Composition is reporting with the DSX kit that I installed. Few tables showed up like Stoich and Base fuel and spark tables.

There are a lot of other tables that don't seem to be there (for example E85 airmass in the virtual torque settings) when I compare with my 2012 Tahoe 5.3 which had factory flex fuel.

Is there any way to get these things with the LS7 ECM?

It gets real old having to ask people to post the file they have all these specific questions about.

Here you go, sorry should have thought of that..

also just additional context, I purchased this vehicle just recently, and I believe the car was lightly tuned over a decade ago (no flex). Obviously I don't have the original owner's hp tuner device, so I had to relicense this ecm with my mpvi2. Could this be an artifact of being tuned by a really old HP tuners device?

The only way to get those tables added would be to ask support, but that's only if they are available to add. Seems unlikely that HP Tuners will do it though, they have a pretty hard stance on certain things now with emissions and adding stuff to vehicles that never had it from the factory.

My opinion is just set the fueling where you want it and leave it. Yeah you can lean it out a little with E85 but you'll probably still be in the mid to upper 12 for commanded AFR. Then just use the flex fuel spark adder table to take advantage of a few degrees more timing. It's still going to pick up some power if you put it on a dyno to check numbers.

so, its normal that the tables are missing correct? Any non factory flex ecm will not have those tables?

So as a starting point just to get me going I copied the Base Spark Flex Fuel table and Mult vs Composition tables from the 6.0 Caprice Flex Fuel PPV stock file. The fueling seemed to already be set on the LS7 base Fuel Alcohol tables.

Anyone willing to take a look at this file to see if it is in the right ball park?