Will my 08 Si hondata reflash be affected with a e85 conversion kit?

[Rock81953]

I have a 2008 Civic Si with a KNN Short ram intake.

[ryker]

why have power mods then use a low power fuel like e85? on a n/a engine with stock compression e85 sucks.

[bouncer07]

Turbo vehicles benefit from the E85 convert and large SUV's. We are high compression, will need Premuim grade.

[SiLentPower]

Keep in mind that you will need to increase fuel delivery by 30% with the conversion. IE: bigger injectors. The reflash isnt enough to do that.

[liquidr1]

why on gods green earth would you even try to do that to your Si.

FAIL

[SiLentPower]

Its kinda what I was thinking.

[ImAuthenticFTW]

Originally Posted by ryker

why have power mods then use a low power fuel like e85? on a n/a engine with stock compression e85 sucks.

Originally Posted by bouncer07

Turbo vehicles benefit from the E85 convert and large SUV's. We are high compression, will need Premuim grade.

E85 has an octane rating of 100–105 hope you guys know that....

[SiLentPower]

Right, but why would you run it without any forced induction...

[ImAuthenticFTW]

Originally Posted by SiLentPower

Right, but why would you run it without any forced induction...

lets see, higher octane means you can introduce more timing (once tuned) before knock shows it dirty little head. there is a LOT of all motor drag cars that are running on e85, its not just for boosted cars

[SiLentPower]

You are correct, but spending the money on the kit and tuning will almost out weigh the power gains from the kit.

[Rock81953]

i installed my conversion with 100 miles on the odometer with no problems, the Si has a compression ratio of 11:1 that is really high.

[ryker]

Originally Posted by ImAuthenticFTW

E85 has an octane rating of 100–105 hope you guys know that....

I hope you know octane does NOT = energy content. E85 has a LOWER BTU energy content. So unless your running high compression or high turbo boost to take advantage of the higher octane levels your taking two steps back.

[ryker]

Originally Posted by Rock81953

i installed my conversion with 100 miles on the odometer with no problems, the Si has a compression ratio of 11:1 that is really high.

the little r18 econo motor is only 0.5 less!

11:1 isn't high when compared to every other modern car. 11:1 is good for 93 octane. Running e85 at 11:1 isn't taking advantage of the 100ish octane. 12.5-13:1 would be needed to help account for the loss in energy content. Now the question is: can the heads flow that much air? increase CR increases air flow needed.

Timing isn't much of a power increase. Where most people see the power from timing is due to running incorrect timing on pump gas then changing over to "race" gas and then going back to correct timing. Sure there is a slight amount of play each way. But a hondata reflash isn't going to help much at all. Mixes as low as E70 can be labeled for sale as "E85" for better winter/cold starting performance, so you have to be careful if you're building/tuning an engine based solely on E85.


A gallon of E85 has an energy content of about 80,000 BTU, compared to gasoline's 124,800 BTU. So about 1.56 gal. of E85 takes you as far as 1 gal. of gas. remember though the increased octane rating of E85 will never make up for the reduced energy density.

[bouncer07]

I've tuned my last car 99 GSX Eclipse on E85 and I say it benefit turbo than N/A. Going N/A on E85 isn't really a point unless your highly modified all motor. Agian, going stock with E85 isn't going to work. Wait for Hondata to come out with it's ECU- it's coming.

[Rock81953]

so i read that the reflash also leans the fuel and slightly changes the ignition timing right?

[BV1]

I subscribe to Motorcycle Magazine, a few issues back, they MADE there own ethanol out of apple juice, and than proceded to convert a Truimph ST to run on it. Before they even started tuning it, on the first dyno run, HP actually went up.

Octane rating, +30% more fuel helped out I guess. Was a good read.

Steve