I watched a video where a fella added e85 until he got to appox 13% ethanol content. On the same vehicle/day/tune the data logging showed how the ecu was pulling up to 7 degrees of timing before adding the e85 and 0 degrees being pulled at the 13%.
On the draggy he had it also shows a .5 faster in the 1/4 mile time. Fwiw it was an Audi supercharged V6.
Makes me want to run a 10% mix in my SR3 if not for power sake for preventing detonation.
Thoughts?
Also btw .. I've been using chevron 94 which is notorious for being poor quality.
Right -- an easy way to raise octane is to add ethanol. Ethanol has higher octane, but lower lambda: without a fuel content sensor (or a tuning change) you'll be running lean. For example, Sunoco GT 260 Plus fuel (with 13% ethanol) has a stoichiometric ratio of 13.7. Sunoco GT 260 fuel with 9.8% ethanol has a stoich of 14.1. Gasoline without ethanol normally has a stoich of 14.6 or 14.7.
Questions: does the typical 100 octane fuel I get trackside, typically Sunoco, have any ethanol? I was under the impression that it did not, thus would not degrade when sitting over 3-4 month time frame.
On a side note, I did notice big difference in appearance of the 100 octane fuel at two different track pumps: one looked normal to me with slight red color while other was perfectly clear.
Well.. comming from a world of ethanol in my cars i really see no point at all.. first of all to be running with a higher ignition you need to tune the car to keep that ignition you want.
to make it pull you need a flexfuel sensor that will read octane level, and retard ignition you have set for that level of octane.
as that is said this works pretty well for force induction engines. Turbo specially has way more power with e30 -e50 or e85.
for a NA engine i really see no point in doing this. The gains will be minimal and more hassle then power output to be honest.
but to tell you a good comparison.
my f80 m3 had 388hp/530nm to the wheels with stock map, 98octane
with stage 2 490hp/700nm to the wheels
e30 stage2 we gained 530hp/740nm
and finally pure e85, 598hp/849nm to the wheels..
this is how much you can push out without doing anything else then remap on this s55 engines..
but on a NA engine i guess you would gain 10-15hp if its a big cc engine. For a 1300-1500 would not help much
Is this discussion about ethanol and 94 octane simply an attempt to not pay $9-$10/gal price for 100 octane? Or, is there some technical advantage compared to recommended fuel? I ask this with all due respect, as I am really just getting started with my new SR3XX.
@raider89 for high compression engines offc. Higher octane is better . But mixing e85 is not the solution if you ask me. At least nothing less then e30.
With engines like we have there is limited advantages before its just wasted money and no gains
more ethanol = need more fuel as well. Higher consumption, bigger injectors so on..
The main reason for me opening this discussion was only about preventing detonation, not about making any more power. In my neck of the woods there are not a lot of options readily available to me for buying race fuel and that's what got me onto thinking of a low % ethanol blend.
I am well versed on the E85 world and what is required in using that particular fuel as I have a 600+ hp twin turbo vehicle that runs E85.
Does the stock gen 2 hayabusa ecu even have the ability to pull timing?
@meatman goos question. Im really not sure. My sr3 runs ECU master with pretty advanced management, a STOCK hayabusa ecu i could not imagine has that.. but do you have stock ecu or MBE? Life?
Btw, is detonation even a issue on this engines unless forced induction? I would imagine they are safely mapped to run long terms
@meatman goos question. Im really not sure. My sr3 runs ECU master with pretty advanced management, a STOCK hayabusa ecu i could not imagine has that.. but do you have stock ecu or MBE? Life?
I am fairly certain it is an oem Hayabusa ECU.
Btw, is detonation even a issue on this engines unless forced induction? I would imagine they are safely mapped to run long terms
For being quoted as needed to run 100 octane fuel I would imagine detonation is a problem with a high compression engine.
but theres the thing. If youre running stock hayabusa ecu, are you sure you need 100oct. At all?
you have the 1500cc engine?
There are no provisions for knock sensors on Hayabusa engines, so there's no way to detect detonation, and so there's no ability to reduce timing. That's true for all the ECUs (OEM, MBE, Life, ECUMaster, MoTeC, etc.).
