I mixed 3 gallons of 103 octane with 9 gallons of 91 octane, reset the ECU, and there was one markedly different characteristic about the car. The "deadspot" after 5500 rpms is completely gone. The power delivery is smooth all the way to redline. I didn't notice any more power below 5500 at all, it just gets rid of the annoying drop off. If your evo lives on 91 octane, give this a shot, it's kinda fun.

 

Actually, a bunch of us do something similar with every couple of tanks.

We mix the 76 brand 100octane fuel with the 91octane. And now that the 91 octane is like $2.50 a gallon, putting in a few gallons of $4.50 100octane fuel doesn't add to the shock too much.

It makes my car feel like it's still living on the east coast and drinking 94 octane Sunoco...

SC~ who's Evo misses genuine 94 octane fuel.

 

hmmm... you want to know the true meaning of PAIN?? try running your Evo on 90 octane caribbean ****-water gas.
{crap} *sigh*

I have been planning for the longest while to put in some VP Motorsport 103..... I am fearful that I will like it too much....

 

I can't get ANY race gas around here, only have 91.
I'm looking into water injection. I found a dealer in Phoenix that sells and installs Aquamist systems. It's like running 103oct all the time.
They are selling the 2D system for $699. Runs off injector signal, if you add the surge and boost cut accessories, it safegards against running out of water, cut feed lines, etc.. (can hurt motor).
Water is a much better cooling agent than gas. If you run water, you can lean out fuel to about 12.5:1AFR safely. Raise boost, add timing adavnce. All good, no bad.
Works sell a similar system for about $980ish(?).
Some reading:
http://member.newsguy.com/~gtfour/skeptics.html
http://waterinjection.info/
http://www.aquamist.co.uk/index.html

 

bishiboy,
do you know how the water is injected, is it tapped into the manifold?

 

Oh yeah, if any of you live in San Diego, there is a place called Ford Fuels on El Cajon blvd that sells 93 ioctane straight from the pump (only 10 cents more than 91), and they may even have 94 octane. They also sell a wide variety of racing fuel. I'll post this part in the west region forum too.

Water injection eh? sounds intriguing, I may have to look into it.

 

I believe that is where Ryan from RnR Racing fills up with leaded race fuel. I think it is like 112 or something.
I might have to think about that water injection setup though. It looks really promising.

 

Use regular alcohol instead or water

 

There have bin a few threads on the water injection thing. I think its great. Many people over here in the UK run it because we pay so much for normal fuel that adding race gas would make it far to expensive to run. Water is good. Most kit are the same. They basically spray a very fine mist into the inlet track (I think I heard 6 inch from the body is good). This fine mist then mixes with the air/fuel mixture and helps cool it. The mane thing that the water does though is to act like an energy buffer inside the cylinder. This means that when you get the spikes in temp/pressure (one of the same) then the water helps absorb them. This means that you can run the engine on a lot harder set up (producing a more tractable and powerful engine) and maintain reliability. All good then!

 

If you run race gas and water injection, you can boost to the moon!
It will deffinitely help my car. I live in Yuma, where daytime, summer temps hit 120F!
Sometimes it's still 95F at 5am before the sun comes up.
Super hot + only 91 oct = poor performance

 

I just went to BC last week and filled my OZ with 94 techron at CHEVRON for like 99cents/litre CAnadian dollars, boiii does it make the car snappier. =)

 

You would really benefit from water injection, with temperatures that high! You know how hot weather kills our turbocharged cars!

another option besides race gas is adding toluene or xylene to your gas. toluene is 114 octane and xylene is 117 octane

 

Done the Toluene thing (and Xylene too). Just not very practicle, it worked though.
I'm about 90% sure I'll be doing H2O injection. Nothing else around here is practicle or available.
I've got the radiator, intercooler and getting a thermostat and rad cap soon.

 

If you do the water injection, tell us how it works! I'm very interested as well

 

Ahh I love the East's gas - 94 oct sunoco is all my car drinks

But you guys have that nice weather all year.