Sunoco 260 gtx

[Kurlon]

One other benefit of pump gas vs the crazier race fuel blends - No crazy corrosion or deposit issues.

[xsiliconkid]

what about a stock motor with a map for race fuel?
better to run it's mapped fuel, 93 octane, or 87...assuming this isn't for an LRRS event.

If the ECU is off the race motor and mapped for the race motor and now on a stock motor.
It will run rich.. will need a stock map or remapping with a O2 sensor etc.
If you run race fuel to the map you will be burning $'s and performance.

[xsiliconkid]

They sell Sun 260, my garage mate Scott used it exclusively in the Harley.

ps I do not believe Scott an the Harley brute machine will be returning in 2014.

[CBR929RE]

Got it!

Thanks for the replies.

Guess I'll just need to drain the fuel that is in the bike before I head up for my first weekend of the year whenever that is.

Joel

burn it in practice on friday.

my EMpro is mapped for U4 back when Eslick rode it. no one can tune an EMPro in New England. no longer running the built motor that the EMpro was tuned for. That's the reason for my question. not running race fuel for the performance gains, but more to keep the A/F ratio normal.

when are you going to give up on that thing?

[Jewcati]

OK..got it...
back to race fuel..all might know this...but it is worth repeating. A stock motor in general using "race fuel" is not only a waste of money but produces less power (there are some exotic fuel exceptions).
To take advantage of race fuels, Engines needs to be modified (e.g., higher compression) and not just dyno'd.

My engines is a DSB Spec build. It was built for 98, however I can run the 93, but supposedly runs better on 98. My concern is ethanol mostly, there are no gas stations near me that have non ethanol 93, I assume the pumps at nhms are.

So if I run the 98, then it cannot be left in the tank at all?

[xsiliconkid]

260 GTX (98 octane) is not a street legal fuel and is for off-road use only.
It is quite stable and "could be left in the tank" but I would not even leave pump gas in the tank see note 1:
Sunoco 260 GTX contains additives to enhance shelf life and engine cleanliness. However, as with any gasoline, it should be stored in opaque, tightly sealed containers where the temperature is stable. Handled under such conditions, the shelf life of 260 GTX is in excess of 2 years.

note 1
CARE OF FUEL FOR PERFORMANCE
It’s critical to handle fuel with care, not just for safety but also for performance reasons. The performance aspects of any hydrocarbon based fuel (pump and race gasoline’s) is not generally understood by many racers.
Gasoline’s a fairly unstable mixture that can quickly ‘age’ and become ‘stale’ as the fuel loses volatile hydrocarbon components through evaporation or oxidation. Using improperly stored gasoline can significantly degrade performance and may even cause engine damage.
The aging process is accelerated if stored in poly fuel jugs, the volatile hydrocarbons can pass right through the walls of the jug. Gasoline is best purchased in smaller volume, used promptly, and stored in a sealed metal container, until used.
Gasoline containers should be stored in a cool, dry place and always kept out of sunlight. Leave gasoline in your plastic jug or in the bike tank; a couple of weeks later the only effective use of that fuel is to power your lawn mower. As much as 20% of the effective energy can be lost in that period of time, with race fuels “aging” even quicker. Leave fuel in a bike’s tank on a cooling, humid, or wet night; water will condensate and dissolve with the fuel (especially anything containing ethanol-the ethanol will be “pulled out of the fuel”)
Pump and Race gas is expensive; with proper and responsible handling it can deliver upon its design performance.
Fuel tips: to reduce the impact on performance
• “FRESH” FUEL OFFERS THE BEST PERFORMANCE – TUNE WITH IT
• DON’T FUEL TANK UNTIL READY TO RUN - MAKE SURE THE GAS TANK IS COOL BEFORE FUELING.
• ONLY STORE FUEL IN METAL FUEL CANS THAT ARE RE-SEALABLE- MADE FOR THAT PURPOSE. (THE 5GAL METAL VP FUEL CANS ARE IDEAL FOR THIS-FLUSH IS STORING DIFFERENT FUEL )
• NEVER STORE FUEL IN YOUR BIKE’S TANK. DRAIN GAS BACK INTO A METAL RE- SEALABLE STORAGE CONTAINER.
• STORE FUEL IN A COOL AND DARK AREA.
• DON’T ALLOW FUEL TO "SLOSH" IN THE TRAILER WHILE TRAVELING TO THE RACE. IT IS BETTER TO BUY FUEL AS YOU NEED IT, IN SMALL INCREMENTS AT THE TRACK. MUST TRAVEL WITH FUEL, HAVE SEALED METAL CONTAINERS FULL.
• WHEN YOU OPEN THE FUEL JUG AND HEAR THAT LITTLE "HISS" - THE VAPORS ESCAPING CONTAIN HIGH ENERGY COMPONENTS OF THE FUEL.
• CAP THE FUEL TIGHTLY AND OPEN IT AS INFREQUENTLY AS POSSIBLE.
• DON’T “MIX” FUELS - SELF BLENDING FUELS IS NEVER ACCURATE, HURTS PERFORMANCE AND IT’S AGAINST ANY SANCTIONING BODY’s “SPEC FUEL” RULE (INCLUDING LRRS)
Graham Pattison

[xsiliconkid]

Yes, the 93 octane pump gas at NHMS contains approx 10% ethanol

[CBR929RE]

Yes, the 93 octane pump gas at NHMS contains approx 10% ethanol

Tom said last year that its around 4%

[Jewcati]

How harmful is the ethanol gas to the components then?

[xsiliconkid]

If you use pump gas(with ethanol) right away or store it correctly (sealed metal container)- it's OK.
Problem is ethanol absorbs water and then drops out of the gasoline sitting in the bottom of your fuel/tank, fuel pump, or float bowl.
It can become a problem (performance wise) leaving gas in the tank between races....or even overnight where there's a lot of condensation going on...
The 93 pump tank at NHMS gets a lot of use so there is no real problem from that angle.