nope... they did not
nope... they did not
01 Z06, 4L60E CONVERSION, L92/L76 TOP END, 72# LS3 INJECTORS (THANKS FIC), DRY NITROUS, COS5
Unlikely to see the factory flex fuel listed as a calibration if it does not come from GM like that.
The later ones (E38/E67 etc) have flex fuel capability built in. EFILive has given more access to that with this release which simplifies things somewhat.
There are shops doing E85 cals on LS1's though. I would guess VE table etc and spark are the main areas to maximise the value of the E85.
An E38 flex fuel cal gives a reasonable idea of what GM is doing to support flex fuel.
I've had several vehicles pre E38 or E67 that were Flex Fuel. Though it wasn't called that back in the day.
so can i use the ff option that efi has listed w/ build 72 on my gen 3 pcm or not?
01 Z06, 4L60E CONVERSION, L92/L76 TOP END, 72# LS3 INJECTORS (THANKS FIC), DRY NITROUS, COS5
Asked a guy who just got through building his 528 if he was going to run Ethanol , he looked at me and laughed , 800+ hp and 2 stage 500 shot Nos , said he would stick to race fuel .
So at what point does Ethanol make it's way into high horsepower engines or will it ever , or has it already ? Lingenfelter has a Corvette that a couple years ago was the first E85 Vette .
2005 1500 HD , Custom OS3 SD tune .
2006 Trailblazer
Dinosaurs and Plants gave their lives so that we may drive , long live fossil fuel .
If you were going to run E85 all the time then there is no great wizardry apart from doing the total retune to suit the E85, it only gets confusing when you want to be able to throw in normal fuel and have the ECM adjust accordingly.
The LS1 PCM's used a real sensor in the fuel line to measure the ethanol content (they are about $400!!), the later Gen-IV's used software for ethanol estimation saving GM the need for the $400 sensor. Please don't ask me to explain how that works! I don't really know apart from they monitor the fuel level sensor and O2 sensor trends and somehow calculate the ethanol percentage from that. It would be interesting to know just how accurate it was.
Cheers,
Ross
I no longer monitor the forum, please either post your question or create a support ticket.
Ta Ross,
You guys have made it easier though to "switch" Ethanol % tunes.
If anyone is interested in how GM's Virtual Fuel Sensing works, and you have some time, take a peek at the patent:
GM-VFS US Patent 7159623.pdf
Accuracy is discussed in the patent.
At a guess, with E0 and E10 using the same tuning, within 5 or 10% accuracy would be ok.
Cheers!