Anyone experimented with E85 on N/A setups?
#1
Anyone experimented with E85 on N/A setups?
hey guys. With all the new power being made on turbo engines and E85, I was just wondering if anyone has pushed an N/A setup with the same fuel, and seen any results? I know an N/A engine is not nearly as susceptible to detonation and heat as with forced induction, but would still think it may allow us to run more aggressive timing and A/F ratios due to the cooler burn.
#3
Scott Howard
i thought about running E85, it's a 45 minute drive for me to get it though. It would be good since it's cheap and comparable to race gas. We could probably run around 28* timing with E85, but I've heard that injector duty cylce must be increased. Not sure what kind of AFR's you would run.
#5
pissin' on pistons
iTrader: (26)
i thought about running E85, it's a 45 minute drive for me to get it though. It would be good since it's cheap and comparable to race gas. We could probably run around 28* timing with E85, but I've heard that injector duty cylce must be increased. Not sure what kind of AFR's you would run.
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#8
Rotors still spinning
iTrader: (1)
As far as advance is concerned, if you run at least 10 degrees of split, you can keep advancing timing until power falls off and it won't detonate. On the other hand, if you run no split you will find a limit. On 87 octane it is somewhere around 21 degrees or so and by 92 octane it is around 28 degrees or so. Give or take 1 or 2. The point is clear though. With E85 being something like 106 octane, you could theoretically advance it farther. Due to flame speed of E85 combined with it's octane level, merely advancing the timing isn't going to do it. You need an entirely different map based around it. You will also need LOTS more fuel flow!
#11
The Shadetree Project
iTrader: (40)
As far as advance is concerned, if you run at least 10 degrees of split, you can keep advancing timing until power falls off and it won't detonate. On the other hand, if you run no split you will find a limit. On 87 octane it is somewhere around 21 degrees or so and by 92 octane it is around 28 degrees or so. Give or take 1 or 2. The point is clear though. With E85 being something like 106 octane, you could theoretically advance it farther. Due to flame speed of E85 combined with it's octane level, merely advancing the timing isn't going to do it. You need an entirely different map based around it. You will also need LOTS more fuel flow!
#14
Scott Howard
Weird, we must have some good gas up in Seattle then. I was rnning 2-3* of split when I was doing dyno pulls with 87 RON+MON + premix(which should lower the octane even more) at 30*BTDC and made 187whp as opposed to the same setup at 27* that made 190 literally just enough time to change timming between pulls, what like 5 minutes. I believe ambiant temps were in the low 80's that day. I've never heard it detonate. What could be the cuase off this? Could my timming light be off or the RB pulley mismarked? The pulley only is marked to 20*advance, but I did the math and added the additional marks.
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