Swapping to e85
Ok I see what you're saying, and appreciate the feedback. I'm in a situation where my car knocks at 28 degrees so we set it at 26. This is on 93 octane. But it gained 12 hp at 28. My tuner and I wanted to try running E85 as an experiment. It shows no knock at 31 degrees and feels noticeably stronger and crisper than the 26 on E85. We haven't tried the nitrous yet due to not having enough fuel pump at the moment. He's tuned several E85 setups and feels very confident that mine responds very well to this. I just wanted others opinions on this as well
For example if your motor puts out 400RWHP NA and you spray a 100 shot on top of that the fueling difference going from E60 to E85 would only be a third of 30% (E10-E85 span) of 20% (100HP N20 shot vs. 500HP total). So with a flex fuel setup going from E60-E85 the fueling difference would be 2%, which unless you were on the absolute ragged edge you would never see.
If your car only gained 12HP from adding two degrees you have too much timing in it to begin with. Bring it back to 26, put E85 in it, and make some pulls while checking the plugs. E85 offers most of its detonation protection from E50 on so the difference in what you get from the pump isn't huge from a timing perspective. A flex fuel sensor/tune is ideal since the NA power of the car will be covered with proper fueling no matter what the E85 percentage out of the pump. Then the only fueling difference will be a percentage of a percentage.
For example if your motor puts out 400RWHP NA and you spray a 100 shot on top of that the fueling difference going from E60 to E85 would only be a third of 30% (E10-E85 span) of 20% (100HP N20 shot vs. 500HP total). So with a flex fuel setup going from E60-E85 the fueling difference would be 2%, which unless you were on the absolute ragged edge you would never see.
For example if your motor puts out 400RWHP NA and you spray a 100 shot on top of that the fueling difference going from E60 to E85 would only be a third of 30% (E10-E85 span) of 20% (100HP N20 shot vs. 500HP total). So with a flex fuel setup going from E60-E85 the fueling difference would be 2%, which unless you were on the absolute ragged edge you would never see.
Tuning off the knock the sensors can get you in trouble. I use a loaded dyno and turn the smoothing down, the graph will start getting rougher when your getting too high in timing. I also look at the gains in horsepower per 1 degree timing added. When your timing is low it make big gains with just 1 degree, as its getting closer the gains will get smaller. Most importantly the plugs dont lie, on a loaded dyno put a fresh set in and do a pull and read the plugs you will most likely end up with less timing than you have now.
Tuning off the knock the sensors can get you in trouble. I use a loaded dyno and turn the smoothing down, the graph will start getting rougher when your getting too high in timing. I also look at the gains in horsepower per 1 degree timing added. When your timing is low it make big gains with just 1 degree, as its getting closer the gains will get smaller. Most importantly the plugs dont lie, on a loaded dyno put a fresh set in and do a pull and read the plugs you will most likely end up with less timing than you have now.
