E-85 NOT Recommended

[White64Goat]

Found this in the owners manual: Pages 422 & 423

SUBARU does not recommend blended gasoline

●

If you use gasohol in your SUBARU, be sure that it has an octane rating

no lower than 93 AKI.

●

SUBARU DOES NOT recommend the use of gasoline containing methanol.

■

SUBARU does not recommend gasoline containing MMT

Some gasoline contains octane enhancing additive called MMT (Methylcyclopentadienyl

Manganese Tricarbonyl).
SUBARU DOES NOT recommend the use of gasoline that contains MMT. If
fuel containing MMT is used, your emission control system may be
adversely affected.
The malfunction indicator lamp on the instrument cluster may come on. If
this happens, contact your SUBARU dealer for service.

●

Use only gasoline containing a maximum

of 10% ethanol.

DO NOT use any flex-fuel or gasoline
that could contain more than 10% ethanol,
including from any pump labeled
E15, E30, E50, E85 (which are only
some examples of fuel containing more

than 10% ethanol).

I've seen posts where folks are using or thinking about (or are) using E-85. If Subaru says you shouldn't, why would you?

■

Notice on fuel quality

●

Do not use improper fuels. If improper fuels are used the engine will be

damaged.

●

Do not use leaded gasoline.

Leaded gasoline can cause damage to your vehicle’s three-way catalytic

converters causing the emission control system to malfunction.

●

Do not use gasohol other than that stated here.

Other gasohol may cause fuel system damage or vehicle performance

problems.

●

Using unleaded gasoline with an octane number or rating lower than the

level previously stated will cause persistent heavy knocking.

At worst, this will lead to engine damage.

■

Fuel-related poor driveability

If after using a different type of fuel, poor driveability is encountered (poor

hot starting, vaporization, engine knocking, etc.), discontinue the use of that
type of fuel.

■

When refueling with gasohol

Take care not to spill gasohol. It can damage your vehicle's paint.

[Justin.b]

I'm assuming the people looking at running e85 are also going to be turbocharging or supercharging the car because you can run more boost.

-Justin

[Opposed]

There are people that have been running e85 in their Subaru's for tens of thousands of miles for years on end with no issues. John (Visconti) has already had the injectors and fuel pump examined on a BRZ/FRS that has been running e85 with no issues so far. If I remember correctly, there has not been a single failure reported due to running e85...

[Guff]

Nobody should put E85 into their stock car.


HOWEVER, it has been found that some direct injection systems can handle E85 out the box, the only requirement being a change in fuel/timing map such as the ones that can be installed via the new ECUTek/Visconti tuning systems and what not.

With a proper tune, one could find some gains in E85 without forced induction.

[rusty959]

I bet subaru also recommends not flashing the ecu, which is something required in order to run e85.

edit: sniped :/

[fenton]

The no E85 is meant for stock cars. If you put it in a stock car(what the manual thinks everyone has) it will run like crap.

Running a special map to allow for the different fuel is completely fine.

[Visconti]

Yeah - can't use it stock.

Car isn't flex fuel stock.

Car is tuned for pumpgas only stock.

It's A.O.K with the flash

John

[Floggin Tires]

Originally Posted by Guff

Nobody should put E85 into their stock car.


HOWEVER, it has been found that some direct injection systems can handle E85 out the box, the only requirement being a change in fuel/timing map such as the ones that can be installed via the new ECUTek/Visconti tuning systems and what not.

With a proper tune, one could find some gains in E85 without forced induction.

^ correct
After 10%+ tune is needed

/thread

[FIREISFUN135]

Subaru tells us we can't use E85 in our stock BRZ/FRS...

[drifter]

If you use gasohol in your SUBARU, be sure that it has an octane rating

no lower than 93 AKI.

●SUBARU acknowledges we are a bunch of morons for selling cars that require at least 93 octane to states that are not allowed to sell it.

[White64Goat]

Ok, guess I got schooled on that info...

John (Visconti), have you had a chance to read the PM I sent you the other day?

[Visconti]

^ it's all a blurrrrrr

Whats up>?

[TouchMyHonda]

Originally Posted by FIREISFUN135

Subaru tells us we can't use E85 in our stock BRZ/FRS...

Its not recommended because its not tuned for it; It can to be tuned to run on it...

[arghx7]

There's zero long-term durability testing information available for the fuel system. We have no idea whether the high pressure fuel pump or direct injectors will hold up. They might, they might not. Whoever supplies the fuel system probably has some idea, and of course they're not talking.

Don't assume the BRZ will be fine because somebody made a gazillion horsepower with E85 in their '04 STi they put less than 10000 miles a year on. Use E85 at your own risk. I'd think twice about doing so on a brand new car under warranty that you're probably making payments on, unless you dump a ton of money into it anyway.