03 Silverado 5.3 ECSB 4x4 Z71
Comp Cam 206/212 .515/.522 112 lSA, hardened rods with LS9 springs
2010 Tahoe VVT AFM 5.3
Stock for now
Yeah I think that was correct (less than 10%), the sensor recalibrates to a non ethanol fuel.
I no longer monitor the forum, please either post your question or create a support ticket.
03 Silverado 5.3 ECSB 4x4 Z71
Comp Cam 206/212 .515/.522 112 lSA, hardened rods with LS9 springs
2010 Tahoe VVT AFM 5.3
Stock for now
Yes, a pretty common thing to add an actual sensor as the "virtual" sensor kinda-sorta works. GM did it to try and remove the physical sensor cost, but I believe they added it back on later vehicles (don't quote me on this part). On the E38, the signal pin is pin 40 on the black X1 connector (there's a good writeup on g8nation as well). Make sure you change the sensor style to physical, and copy all the FF values over from a factory FF tune.
I'm in the midst of doing this on my Sonic (E78) so I can run E85 on it.
~Erik~
2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.
Thanks for the info, i will checkout the writeup on g8nation. It's too cold to do a conversion in an unheated garage right now. I may end up disabling flex fuel until this spring when it warms up and I can do the conversion to an actual sensor.
A couple weeks ago I ran the tank nearly dry and filled up with E0 fuel. Reset the fuel composition. I noticed that the reset would set the fuel composition to 3.3% ethanol. As I've been driving around for the last while the number has slowly been trending upward. It's currently at 14% with E0 fuel! I'm going to start doing some poking around online to see if anyone understands the calculated formula that it's using. I suspect the computer's increasing fueling to bring the LTFT's into the 0 to -2 range.
03 Silverado 5.3 ECSB 4x4 Z71
Comp Cam 206/212 .515/.522 112 lSA, hardened rods with LS9 springs
2010 Tahoe VVT AFM 5.3
Stock for now
The physical sensors are relatively cheap now, about $50 or so.