Last E85 thread I promise.
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FlexFuel sensor. No idea on stock PCM interfacing with one, my knowledge on them is limited to use with Standalone EMS.
Not really necessary either way. Tune on E85, when you get stuck with E70 or something, you'll just go slightly rich. (I'm buzzed, so I might have that backward. lol.)
Adjusted? Why? Stoich is Stoich, be it on 93 or E70.
Yes, richer with E70 if tuned on E85. I asked in his last thread if these cars came stock with wideband o2 sensors and used o2 correction in the tune. No feedback on that either.
Forewarning: What I say below is based on how Toyota flex fuel vehicles (especially the Tundra) work so dont take it as fact towards your chebby.
Now, from what I've seen, with the flex fuel vehicles that come through the shop, the computer, even with all the sensors in the world, still has to recognize a certain fill up/start/drive procedure to recognize the amount of ethanol.
Example. We had a truck come in with this problem.
2010 Tundra with a flex fuel 5.7L v8:
- Guy had filled up with 93 octane pump its whole life (roughly 35k miles). He one day decided to fill up with E85 simply because its cheaper. He filled up, started the truck and drove off like a batt out of hell like he normally does. Truck ends up in the shop not being able to Idle or go about 45 mph. Shop foreman/Toyota Master Tech tries to diag truck to no avail. Calls corporate tech and they explain that the vehicle has to be started and driven to a certain (in a relaxed way, but still have to follow some basic steps) procedure to allow the vehicle to adjust for the E85.
Long story short, the tech had to completely reset the computer in the truck to reset the fuel mapping and then tell the customer first hand to follow p.112 in his owner manual refering how to properly fill the truck up and drive the truck in the process of switching between the fuel types.
Again, I'm not commenting on your car specifically, but I imagine the chevy's arent too far off in terms of how a factory flex fuel sensor/programming works.
Now, from what I've seen, with the flex fuel vehicles that come through the shop, the computer, even with all the sensors in the world, still has to recognize a certain fill up/start/drive procedure to recognize the amount of ethanol.
Example. We had a truck come in with this problem.
2010 Tundra with a flex fuel 5.7L v8:
- Guy had filled up with 93 octane pump its whole life (roughly 35k miles). He one day decided to fill up with E85 simply because its cheaper. He filled up, started the truck and drove off like a batt out of hell like he normally does. Truck ends up in the shop not being able to Idle or go about 45 mph. Shop foreman/Toyota Master Tech tries to diag truck to no avail. Calls corporate tech and they explain that the vehicle has to be started and driven to a certain (in a relaxed way, but still have to follow some basic steps) procedure to allow the vehicle to adjust for the E85.
Long story short, the tech had to completely reset the computer in the truck to reset the fuel mapping and then tell the customer first hand to follow p.112 in his owner manual refering how to properly fill the truck up and drive the truck in the process of switching between the fuel types.
Again, I'm not commenting on your car specifically, but I imagine the chevy's arent too far off in terms of how a factory flex fuel sensor/programming works.
E85 smells like peanuts and farts. OP, its a matter of whether or not your PCM can support an inline flex fuel sensor. If it can with relative ease then I'd say its a better deal as it will proactively pull timing and richen the afr to accommodate for less ethanol. It's better than your car reactivity pulling timing when the knock sensors begin to detect KR.
I do have some if you need it. I can only spare about 5 gallons though as I've been using quite a bit for tuning lately. Will that work?
Yeah but you are on a stand alone correct? My stock PCM is older so it doesn't have the capability. That is why I have to test my fuel and datalog often while making sure the e85 i use is consistent. Now whether or not the pcm in the vette can support flexfuel sensors is the question. If it doesn't from factory, I would be surprised if it could in the aftermarket without swapping PCMs all together or going standalone which is far more headache than what it's worth for the OP's car. However if the stock pcm can accomidate for a flexfuel sensor than that is titties!!!
Ya...my statement pretty much had no helpful information in it
I'm jelly about those standalones. I'd almost consider one just because you can utilize flexfuel sensors and with proper setup wouldn't have to worry about getting a bad batch of e85. Totes to teh jelly!
Snap, I would need close to 10 prolly I have to be close to a half tank to keep the fuel bucket full, I may just order some there used to be a place that had hot blended e85 I think it was e98 cut down to e85 with race gas rather than the junk they use at the pump thank you for the offer tho
Boomba racing was selling 5 gallon cans of e98 a couple years ago that's the only reason I know that lol, the place I work for sells what they use to make ethanol un drinkable I'm going to do some research and see if I can buy direct from an ethanol plant to blend my own since there is a 110 pump right down the road from me
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