Planet Minis

mx571

what gas, i mean octane are you guys running in your pitsters? i have a 08 x4r and it definitely runs better on half pump gas and half race gas.

dood

If your bike is running better with half race gas mix, your jetting is off.
High octane doesn't make more power, it actually takes away hp because of it's slow burning characteristics.
Run the lowest octane you can with out detonation.
I know plenty of engines out there running 89 octane.

Travisfab

I run premium grade (91 octane) pump gas in my GPX.

chiro972b

Ditto. The whole octane thing is one of the most misunderstood topics in the motoring world.

crwclev

We're running Trak Tech 110...working for 2 out of 3 bikes so far.

Zachmotox179

anyone using the torco race fuel?

paunchy

Here we go again with another lame high-octane thread...

dood

Like I said...

mx571

ok if my jetting is off then how come if i put race gas in the bike it comes alive. its faster throughout the whole rpm range with the race gas. its a big difference.by the way my pilot jet is 27.5 and my main is 112 and the needle is in the middle position and the air screw is about 1 turn out. just dont understand help me out guys!

keith42

Octane is only part of the equation, the quality and consistancy of gas today is terrible. Your bike might be jetted correctly but for what formula of gas, 10% ethanol, winter blend, different blends for high population areas, different elevations with different evaporation rates, etc. Race gas is a consistant high quality gas that allows you to jet on the edge. Plus each gas company puts in their own additive package which is a different issue.

Really it shouldn't be looked at as race gas but as high quality gas. The bottom line is these motors only run better on race gas if the quality of gas your comparing it to is lacking.

dood

very true.
Most people idea of race gas is 110 octane stuff they buy down at the local gas station that sells the stuff out of their in ground containers.
You don't see any of the factory guys buying fuel that way.
True race fuels have additives and excellerants to make more power, like Propylene Oxide and other oxygen bearing chemicals.
Also the properties of race fuels can be different like specific gravity.
All this stuff will make a difference in the way your engine runs and or carburates.
Most race gases are lightly oxygenated or their fuels have a lighter gravity in which case you will need to richin up your mixture to compensate for this.
If your bike runs better on the "race fuel", it's probrobly jetted to rich in the first place.
I always tell people if that you run pump fuel. Make sure it's fresh stuff from a frequently visited gas station ( like one next to a freeway on ramp) vs out in the middle of podunk trying to save some $$.
Real race fuels that actually make power are going to be expensive and are high maintinence. The stuff I run is $32. a gal but it's worth every bit of that if you are building championship winning engines.

ROBINSONDB22

what fuel do you run, nitro methane?

dood

close, jk
The fuel that I run is gasoline based.

ROBINSONDB22

i just can't believe there is a gasoline based fuel that is $32 a gallon and why aren't you saying what is is?

dood

There are ton's of fuels out there that are stupidly expensive but they are expensive for a reason.
All the factory teams run their own version of fuels to get the most out of their engines
Try pricing out VP MR10 or R-tech PRO V-1.
Yoshimura's F&L fuel goes for over $200 a gallon.

keith42

For years F-1 cars ran their own blends of fuel with heavy metals and all kinds of strange stuff. That was in the days of 1300-1500hp turbcharged 4 cylinder motors with powerbands of 1500rpm. I remember Ron Dennis (F1 team manager) saying it cost over $700 dollars a gallon to blend that stuff.

MiniMoto004

and we though pump prices were high

dood

haha true, but with a pitbike engine only being able to hold just over a gallon a gas, it aint so bad.
My gas bill for my roadracers just for a weekend race is $450. My tire bill is twice that much and that is just for 2 sprint races.

keith42

dood what do you race?

dood

ZX6R this year and maybe a GSXR750 if I have time to build it.