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Anyone opinions using E85 for Track Days?

I was talking with Shaun about this a while back. Apparently the direct injection on the gen 3 benefits way more from e85 than the port injection of earlier models. I saw 12 hp going from 91 to e85. We don’t get nearly the bump the gen 3’s do, but still worth the trouble for all the same reasons.

Yeah the direct injection can take a lot more timing than port injection, and its pronounced at low rpms on the coyote because the direct injection is mainly used below 3k rpm. So on a track not a big deal, but fun for a street car. The higher comp of the gen3's also generate a bit more gains up top than a gen2 though too.
 
Ale how do you see the fuel starvation any different between E85 and regular gas? before my in-tank transfer pump I'd starve at 3/4 tank which I would reach by the end of a flat out 20min session anyways. So at least for me the extra burn rate of E85 does not induce starvation earlier, the car was starving already on regular gas.
I re read my post. It wasnt clear lol.
The e85 run richer so u need much more volume than regular gas
u can struggling to pick up enough e85 when the fuel level is low.
Also,
Because you need always a 3/4 of tank.. you may have mileage issue.
Meaning if with gas u do ,i.e. 7 laps before reaching 3/4.of.tank
With e85 u may do just 4 laps before reaching that minimum level.
So if you go for the 5th lap u may "struggle"

Hope this makes it a little clearer
 
Resurrecting this thread because I found Flex Fuel at a Rudder's near Lancaster, PA about 16 miles from my home. Not a bad trip and lots of room to drive the trailer up to the pump and fill my 55 gallon drum.
I just tested some and it came out E70 but it's winter here. Pump says it can be anywhere from E50-E83. Would you expect the % to rise by summer?? I will test again in the spring but I was thinking about mixing race E90 with E70 just to get it higher in anticipation of my new motor install and tune. I hope to be able to predict how much E90 I need to keep the overall % around E80-85 so the tune remains consistent.
 
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Resurrecting this thread because I found Flex Fuel at a Rudder's near Lancaster, PA about 16 miles from my home. Not a bad trip and lots of room to drive the trailer up to the pump and fill my 55 gallon drum.
I just tested some and it came out E70 but it's winter here. Pump says it can be anywhere from E50-E83. Would you expect the % to rise by summer?? I will test again in the spring but I was thinking about mixing race E90 with E70 just to get it higher in anticipation of my new motor install and tune. I hope to be able to predict how much E90 I need to keep the overall % around E80-85 so the tune remains consistent.
Yes the Ethanol % increases in summer. More Gasoline is added to the Ethanol in winter to make it light faster in cold weather.
I also thought about mixing pump e85 and race e85 but then it would become an expensive science project that I didn't really need so I just go 100% pump.
It's worked well for about 12 years. Just tune the car for the ethanol content that you are going to run and you're good to go.
Doesn't have to be exactly e85, I have run fuel down to the 70's without issue.
 

Mad Hatter

Gotta go Faster
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If what I read is right, once you get over E60 the ability to add advance is about the same all the way to E85, but with E60 you will miss out on the cooling effects (kind of circular argument...). Which is my main reason for switching to Ethanol in the first place. Hoping to get my LU47 injectors in this week.
 

Boone

Professional Thread Killer
My '05 is true flex fuel. I can run any mixture of 93 octane and E85. In theory, it's Lambda = 1 at all time. I have a GM fuel sensor in my fuel line that tells a piggy back computer what the E% of the fuel in my return line is. This computer adjusts the signal to the injectors to compensate for the fuel mix. Great for a street car, and I purchased ten 5 gallon jugs that I take to the track full of E85 since availability can be sketchy. Unnecessarily complicated for a race car.
 

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