Race fuel mixture while on track: Discussion
I run straight E85 on the street in my Evo 10 but I didn't want to lug a billion 5 gallon jugs of fuel to the track so I did exactly what you are asking.
I set up my TephraV2 maps 1-8 for "manual" flex fuel. Basically each map slot has changes for 10% Ethanol fuel changes, from 10% (pump gas) to 80% (E85), with some head room for each so I can get away with the 5% differences in between map slot switches.
I also have an Ethanol sensor installed in the car. So it will tell my the Ethanol percentage that is currently in the car and I switch to the appropriate map. It's really easy to do on the 10 because you can switch via cruise control button in real time. I actually switched maps on track once at my last event.
It helps a ton. I only bring about three five gallon jugs of E85 to the track and usually end up running around an E50 to E60 mixture.
The car runs so much better on that mixture than 91 and even 100, which btw is crazy expensive at the track I go to. ($9.98 gallon compared to $2.50 gallon to bring E85) I save about $100 a track day running the E85 mixture over a 100 mixture.
I set up my TephraV2 maps 1-8 for "manual" flex fuel. Basically each map slot has changes for 10% Ethanol fuel changes, from 10% (pump gas) to 80% (E85), with some head room for each so I can get away with the 5% differences in between map slot switches.
I also have an Ethanol sensor installed in the car. So it will tell my the Ethanol percentage that is currently in the car and I switch to the appropriate map. It's really easy to do on the 10 because you can switch via cruise control button in real time. I actually switched maps on track once at my last event.
It helps a ton. I only bring about three five gallon jugs of E85 to the track and usually end up running around an E50 to E60 mixture.
The car runs so much better on that mixture than 91 and even 100, which btw is crazy expensive at the track I go to. ($9.98 gallon compared to $2.50 gallon to bring E85) I save about $100 a track day running the E85 mixture over a 100 mixture.
that's cool. i wish i could do that or flex fuel on evo 9 ecu
There has been some progress in this area recently:
https://www.evolutionm.net/forums/ev...stock-ecu.html
Don't know if you saw it or not.
https://www.evolutionm.net/forums/ev...stock-ecu.html
Don't know if you saw it or not.
There has been some progress in this area recently:
https://www.evolutionm.net/forums/ev...stock-ecu.html
Don't know if you saw it or not.
https://www.evolutionm.net/forums/ev...stock-ecu.html
Don't know if you saw it or not.
Otherwise, I love to see stuff like this. I just wish it wasn't so locked-down with vendor lock-in.
I've been running Cali 91 (oh dear) at around 11.2 AF with basically a couple continuous counts of knock that have been impossible to tune out. Started spraying 50/50 water/IPA (gasp!) through an AEM 500cc/min system starting ~65% IDC which is about 5000 RPM and now only see something rare in the logs. AF dropped to ~10.8 but interestingly EGT's still get into the low 900C range at 7500 RPM.
Since we double drive the car three tanks of $9/gal 100 a day was just too much.
Since we double drive the car three tanks of $9/gal 100 a day was just too much.
Timing seems low. My car on stock turbo/cams/intercooler running 24-19psi was hitting 2* at peak torque, and 11-12* out the top. Maybe play with your knock sensor filtering, or test for false knock. If the knock isn't going away when you mix in race gas, its likely false..
I'll have to do the 100 octane knock sensor characterization test next time at the track. It'd be a good reality check.
While my power is low, would a colder plug make sense in this application (high load / duty cycle)? With something like IW24's what's the effect on knock tolerance?
While my power is low, would a colder plug make sense in this application (high load / duty cycle)? With something like IW24's what's the effect on knock tolerance?
A lot of performance Japanese cars are tuned for higher octane fuels from the factory, and will often pink badly on anything less than 97. I suspect the "Racing Fuel" will have other additives as well. If your car is tuned for 93 it would probably still run on 100, but certainly won't run well. (out of interest, what ratings are "regular" and "mid" - here we have "premium" at 95 and "super" at 97 or 99)
The reason you will occasionally see "Racing Fuel" sold in petrol stations (usually near race tracks) is that a lot of series require competitors to use "pump fuel" - By making it available to the public it counts as pump fuel and so can be used in the races. Java
The reason you will occasionally see "Racing Fuel" sold in petrol stations (usually near race tracks) is that a lot of series require competitors to use "pump fuel" - By making it available to the public it counts as pump fuel and so can be used in the races. Java
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