Originally Posted by Twistedpixels

I do not see how you are doing this since the PCM has no idea what the AFR is. You have to have a wideband on it and talking to the PCM at once and that cant happen. SO you are talking about high and low octane tables which has nothing to do with knowing if the car is on e85 or not but just setting it to switch to higher timing tables if it senses no KR which would be because of the e85. My car does have this set already by my tuner. So if I am not running torco it will switch to the lower timing tables because of the KR. Really you need to be tuning on the fuel you are going to bring. There is only one VE and MAF table and everything is adjusting by KR. My tuner went over this in detail with me.

Originally Posted by RyneZ06

you're right they do not have wide band o2 sensors. However when i say "flex-fuel" i mean we are integrating a flex fuel sensor in the fuel system and wiring it to the pcm. in real time it will know what the ethanol is. In the factory Stoich. table the pcm has various stoichiometric values for various levels of ethanol content. for example lets say e10 stoich (most pump gas is ) is 14.1:1 roughly , then e85 is 9.75:1... the pcm has these known values and everywhere in between these values. So if the content is 30% or 50% or 90% ethanol, the computer knows the stoich value in real time. Now you can program how aggressively the computer goes into "alcohol" wot fueling and timing... for example i generally have it do a 50% blend of pump gas timing/fueling and e85 timing/fueling at roughly 50% ethanol content, then once it reaches 70+% ethanol content i go to full "alcohol" timing/fueling.... i had a 2010 cts-v on the dyno with a mild cam and a pulley. We set it up on flex fuel. It made 545 rwhp on pump gas, and 625 rwhp on e85, only change made was adding e85 to the tank, and waiting for the e85 to circulate into the fuel system thoroughly... there are a bunch tables already dedicated to these functions in the pcm... most tuners overlook them or have no idea how or what they do..... i know of only two tuners in socal (including myself) actively doing flex fuel right now, obviously yours isn't one of them. (no offense)

Originally Posted by Corvettinator

Oh man, I should have never looked in this thread, all I need is more mod temptation.

Dare I ask, what kind of mileage on a 454 with ETOH?

Originally Posted by RyneZ06

you're right they do not have wide band o2 sensors. However when i say "flex-fuel" i mean we are integrating a flex fuel sensor in the fuel system and wiring it to the pcm. in real time it will know what the ethanol is. In the factory Stoich. table the pcm has various stoichiometric values for various levels of ethanol content. for example lets say e10 stoich (most pump gas is ) is 14.1:1 roughly , then e85 is 9.75:1... the pcm has these known values and everywhere in between these values. So if the content is 30% or 50% or 90% ethanol, the computer knows the stoich value in real time. Now you can program how aggressively the computer goes into "alcohol" wot fueling and timing... for example i generally have it do a 50% blend of pump gas timing/fueling and e85 timing/fueling at roughly 50% ethanol content, then once it reaches 70+% ethanol content i go to full "alcohol" timing/fueling.... i had a 2010 cts-v on the dyno with a mild cam and a pulley. We set it up on flex fuel. It made 545 rwhp on pump gas, and 625 rwhp on e85, only change made was adding e85 to the tank, and waiting for the e85 to circulate into the fuel system thoroughly... there are a bunch tables already dedicated to these functions in the pcm.

Originally Posted by 2014BlkVette

I really, really, really need to make my way over to CMS one day! I've heard nothing but good things about them. Congrats, sounds like a real sumbich!