[TP2SS]

Originally Posted by arpad_m

"Flex fuel" means an arbitrary composition of gasoline and ethanol, typically ranging from 15% to 85% ethanol (sometimes simply referred to as "alcohol"). "Flex fuel cars" are those that are equipped to use regular gasoline as well as a gasoline/ethanol mix. Gas stations that sell "E85" provide a mix that is up to 85% ethanol.

Since ethanol has a lower energy density, more volume of it is required to produce the same horsepower, so fuel systems need to be sized to be able to supply the additional fuel volume. Ethanol burns cleaner and cooler, which allows for more aggressive tuning and thus more power in the end, provided the fuel system can cope with the extra volume requirement. (Obviously, fuel economy will take a hit when using ethanol, but ethanol is typically much cheaper than octane 93 gas.)

For this reason, not all modified Camaros (equipped with an aftermarket "flex fuel kit" and the associated tune, which is a prerequisite) are able to use full E85; depending on how capable their fuel system is, they need to use a mixture that is down to E70-60-50 etc.

Fortunately, however, most of the achievable power gains are realized at E60-65, after that, the law of diminishing returns kicks in, so using straight E85 out of a pump is more a matter of convenience than necessity. From what I read here, stock and even FBO SS powertrains can use E85, the fuel system only needs to be upgraded when using forced induction.

I think he meant which BRAND kit to get, not which type of E

[knighti2]

A Rotofab intake was already installed when I baselined my car which was 400rwhp.
I had a Solar 87mm ported TB, Kooks headers / green cats, MSD wires and new plugs, a flex fuel system and the requisite tuning.

This was all on a local shop's mustang dyno:
On 93 Octane the car made 429rwhp.
On E85 the car made 460rhwp.


I kept the stock NPP muffler as well.

[arpad_m]

Originally Posted by TP2SS

I think he meant which BRAND kit to get, not which type of E

Whatever... it's in my signature anyway.

[Need4Camaro]

Originally Posted by carlythecamaro

which flex fuel do you recommend I get?

They just used a regular AC Delco sensor for mine:

ACDelco Part Number: 13507129
https://www.summitracing.com/parts/ado-13507129

And this wiring harness:

ACDelco Part Number: 23153101
https://www.gmpartsdirect.com/oem-pa...rness-23153101

[FlukeSS]

Originally Posted by Need4Camaro

I have similar mods and with everything installed (full exhaust and CAI + E85 tune) tuned at one time I picked up between 50 and 70 HP but there is skepticism that the dyno I used wasnt accurate so I would say 50 HP to be safe.

Not necessarily inaccurate.

My tune yielded almost 85hp increase at the crank from stock. Minus 15%+ parasitic loss. 72.25 hp gain at best at the wheels. Which means at worst my car would have baselined for ~387 rwhp without mods or if we factor 50 hp like you stated, then 400-410 hp baseline before mods (making it a unicorn from the factory which is statistically rare)

It is a safer bet to assume you do not own a unicorn, as most of our cars baseline between 390-400 a majority of the time, with a few outliers, highest I know of is 419 rwhp from the factory, which is ultra uber rare as I've never found anyone else making that claim. In which case your gains are closer to 30-40 rwhp gain in retrospect with all of the same mods you and I have.

[Capricio]

I think most stations are selling something close to 50% ethanol now that subsidies are mostly gone? Understand that converting to ethanol means "oversizing" your injector compared to running premium gasoline only. So while you can still run premium gasoline, you will end up "front loading" your injector charge and not atomizing as thoroughly through the entire intake stroke. Not sure how much this decreases performance/efficiency compared to running a regular size non-flexfuel injector on 93 Octane, but something to be aware of. General rule is to run the smallest injector capable of getting the job done. e85 is getting harder to find (for me, anyways), i'd settle for the convenience/efficiency of 93 Octane over compensating for variability/availability of e85. I wish my truck wasn't factory equipped for flex fuel because i think it could get better mpg if it didn't have it. ...but if your intent to run e85 all the time and you have a good local source for it, go for it!

[OB0001]

Michigan station E85 in the summer is close or above the 85% in my neck of the woods (random testing) E85 sensor

[GTO_Gregory]

In the middle of Texas where I'm at it's about 76% ethanol per my measurements.
The E85 costs vary from $3.25 - $3.95 per gallon.