nefarious_Saint

I run a 100% stock Evo x gsr.
Found a 100 octane gas station near my house.

Can I run the fuel with stock engine mapping? And no mods?

What are the pro/cons of this besides it being $10 a Gallon?

Will I see power output increase?

Stevo-X

con: car blew up...

nefarious_Saint

Ahh

novem

iTrader: (2)

I don't know about X's..but 8's were meant to run on 93 octane. There is a gas station by me that sells 100VP at the pump, so I mix 91/100 down to 93/94 octane. My car runs alot better, more power, and the gas lasts longer than straight 91!

N.

reggae4k

Unless you are tuned for 100 octane, you will only feel the pain of wasting money.

Veronica

iTrader: (2)

^this.

nefarious_Saint

I guess I'll just stick with the 91.

What about half tank 91 and half tank 100?
Roughly 95 octane?

.M.

^Is 93 octane available? If so, I wouldn't bother with the mix.

nefarious_Saint

I'm in California.
The highest we have is 91 at the pump.
Emission laws are crazy here.

reggae4k

you can mix, but to minimize waste of money, get closer to 93 octane. if you have easy access to e85, you should tune and mod for e85 instead. e85 is roughly 105 octane. one downside is that you will see lower mpg because e85 has a lower btu rating than gasoline.

DSG Performance

Get a tune for it, otherwise you're wasting your money.

Mystykalbaby

correct me if i'm wrong but the whole point of higher octane fuels is to fight off detonation or knocking from high compression or high cylinder pressures from forced induction. so unless your knocking bad with an evo that's hard to do stock unless you put like 87 or 89 in the tank. you theoretically tun 2 tunes and switch between the 2 on the fly. but no doubt 100 wont do nothing for you without other mods coming into play. also if you go much higher on the octane I believe you can cause the car to no run at all as it can't ignite a mixture that high in octane.

hope this helps

Aashenfox

As someone who has easy access to 100 octane at the pumps (Eastern Europe) I should point out that you will not prevent the car from starting or running normally, and it will not blow up. But as others have said, you won't see any gain from it unless you tune for it. More octane simply means its more difficult to burn (prevents predets). I used it exclusively in my S2K (high comp, high revving engine). The European AP1 S2K definitely prefers 100 on the stock tune. I also used it occasionally in my EP3 Type R, which gets absolutely no benefit from it, as many people do here, and had no issues of course (none were expected or even imagined, you will barely be able to tell the difference in how the car runs). For interest value we pay about 15% more than standard pump gas (which I'm not actually sure what the official octane count is) for 100. Another thing to note is that more than one gas station has told me that when they pull the filters from the 100 pumps, they are noticeably cleaner than the 'stock' gas pumps, and it is therefore widely believed around here, that you are ALWAYS doing your engine a favor by running 100 simply because its cleaner fuel. Not sure I believe that, but hey... 90% of gas stations here have plenty of stock of 100 at reasonable prices, a 'good thing' when you consider that we have to pay nearly $3000 a year for the privilege of owning high cc (yes, 2.0 is considered a BIG engine here) cars. I pay nearly $1000 just for road tax (based on cc and emissions), another $900 for 'luxury tax' (its a luxury to own a high cc car), about $1000 for fully comp insurance (which isn't bad tbh, I'm 38, 12 years no claims).