Just curious how it works? Retard timing? Does it cause a decrease in power/performance?
what really does the ethanol mode do?
- Thread starter snojnke
- Start date
I believe it is also 5% richer across the whole fuel map.
5% fuel enrichment. The stoichiometric air fuel ratio for ethanol blended fuels is richer than standard gasoline. 14.7:1 for regular gasoline. ~14.1:1 for E10. I doubt they mess with the timing curves between the two. Ethanol provides thermal efficiency gains over standard gasoline, and you can usually get away with more timing in an ethanol powered engine if both fuel curves are optimized.
1 degree in timing dofference
It should be basically negligible.
I run ethanol fuel in Colorado and use the non-ethanol plug/setting. I ride 9k-12k so at that elevation the ECM runs the sled a little richer anyway. I have never had problems running the non-ethanol plug where I'm at.
If you run non ethanol fuel, why would you use the ethanol plug?
Technically you would have a leaner oil/fuel ratio on ethanol as there is 5%more fuel coming in and the same amount of oil, but this is basically negligible. I don't run any ethanol fuel any more so my sled is always on the non e setting.
But back before we could get non e fuel I would also run on the non e setting with ethanol fuel at higher elevations because it runs slightly leaner. It actually does make a small noticeable difference in power.
But back before we could get non e fuel I would also run on the non e setting with ethanol fuel at higher elevations because it runs slightly leaner. It actually does make a small noticeable difference in power.
Unfortunatally this is off original topic, but why do you guys think you can get away with running the non-ethanol mode with ethanol fuel at higher elevations? Yes there is less air up higher thus less fuel is needed to operate at the correct air to fuel ratio. But your computer is already compensating for the elevation...so that your air to fuel ratio is always proper.
Running Ethanol fuel in the non-ethanol mode at any elevation be it 15,000' or 1,000' is creating the same lean condition. Thats why they come with any ethanol mode for ethanol fuel.
Running Ethanol fuel in the non-ethanol mode at any elevation be it 15,000' or 1,000' is creating the same lean condition. Thats why they come with any ethanol mode for ethanol fuel.
I think in theory you would be correct, but it just has been my experience (and I could be wrong) that the computer never compensated enough for elevation any way. That is my sleds have always been a little leaner down low than they are up high, even with fuel injection. And that is only from plug readings, not pyros. Plus I'm sure that the factory mapping has a more than 5% cushion built in any way ie not always running right on the edge with fuel mapping. Any one else experienced this?
ps, I would think if the fuel injection system worked perfectly as it should there should be no switch necessary, it should be able to figure out what to do with the fuel its given, all of our cars do..
You would be correct if the fuel injection system in sleds was as sophisticated as fuel injection in cars. If Poo was to add all the sensors needed, plan on spending alot more money. EFI in sleds only monitor 6 conditions.
G
gman086
Well-known member
Actually most altitude compensation systems for sleds have a 0-10,000 feet range and above that you're on your own so... hells yeah it's a good idea to run the non-ethanol plug with ethanol gas for the higher elevation riders! Same exact reason the Doo guys have to jet down even with DPM at altitudes above 10,000'.
Have FUN!
G MAN
Have FUN!
G MAN
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