XFR/Firecat/Sabercat Regular 128" XF / Firecat/Sabercat chassis

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Old 01-03-2007, 10:59 PM   #1
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Can the F7 handle Avgas or 110octane leaded race fuel, the reason i am asking is because i rather run those gas on the F7 wheni get it this fall.

I always run those gas on my 2 stroke, yea i know its expensive, but i love the smell and it runs allotta better.
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Old 01-04-2007, 04:43 AM   #2
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Octane is a measure of the resistence to detonation. Despite what some may tell you, your motor will preform the best with the lowest grade of octane without detonating the motor. The higher the octane does not mean your motor will preform better or the fuel itself is better. Your F7, assuming no motor mods are on it, will preform best with 87 octane it in, and seeing as how your from Minimalsnowta, the enthonal switch unplugged (whatever it is for running ethonal in your motor). The motors that run Av gas and 104+ octane fuels are race motors. They are completely worthless on stock F7's and even modified F7's as most of the time, 91-94 octane will more the sufice for most mods. Hope this helps you out a bit, and if you have any more questions, I'm sure there are others who know much more on the subject then myself and will be glad to help you.
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Old 01-04-2007, 08:06 AM   #3
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Racinfarmer is correct. With the large squish and the low compression of these trail motors high octane fuels are not neccesary. They have a much slower burn then lower octane fuels and if you do run them it will be hard for your engine to build desireable combustion temps resulting in lower HP then your engine could make on lower octane fuels. I would suggest running alittle higher octane fuel then the manufactuer suggest like 89, due to the fact that as fuel sits it loses octane and with the winters we are getting you never know. Jim
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Old 01-04-2007, 08:52 AM   #4
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i know the difference bwtn 87 and high octane race fuels. and detonation, etc.. but it of course does not run faster. i can tell that it idles better and responses a tad bit better. just no power gain thats all. but all of my 2 strokes had shaved head or aftermarket head tho. but still on stock motor with minmal bolt on, i liked the way it runRas, not meaning power, i mean the way it runs on those fuel rather than 87, and ihate the smell of 87 octane. there are several different kind of race fuel for different kinds of applications.

race motor will of course need those fuel for sure. i know that. Also race fuel are known to help keep carbon deposit out. when i run 91 octane i notice build up of carbon deposit, but with race fuel its much cleaner.

so, I was just simply asking if the EFI can handle it? because race leaded fuel is bad for oxygen sensor. AC EFI dont have oxygen sensor dont they?

Btw i dont have F7 yet, and when i get it, i will be doing some work to it tho. so im just learning what a AC EFI can do and if i should stick with carbed or whatsover.
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Old 01-05-2007, 06:30 AM   #5
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Im not no EFI guru, but if your looking for "the smell" I don't see why you couldn't run a little bit to your regular gas you put in. The smell is awesome but like everyone said already including yourself your not gaining any Performance. just my 2cents
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Old 01-05-2007, 06:42 AM   #6
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You can run all the leaded 110 you want!! I mix a few gallons with 92 on my F9 but I do it because I run NOS and need a little extra cusion!! you will be throwing your money away and your sled WILL be slower because you will lose a couple hp because you don't need 110,but to answer your question ,yes,you can run leaded 110 in an EFI motor!! Good Luck.......
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Old 01-05-2007, 08:17 AM   #7
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Leaded gas is not recommended in car engines not only due to the converter, but also the injectors. It is well known that the lead will foul up injectors, however in a sled I don't believe it will cause you a problem. You just don't put the hours on a sled like a car and as CJT suggest mixing it is probably the best way to get what you want. Jim
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