Race fuel

[Cholmes11]

Looking to try out some race fuel because I wanna get away from the pump and ethanol crap. I'm looking at vp u4.4 and vp t4 what do you guys think? The motor is stock besides a remap and exhaust

[jgrimes59]

Have you considered AV fuel? Also known as 100LL. It's very clean burning and doesn't have the crap like the pump has. I've been running it for years. I wouldn't run anything hotter than 100 octane unless you have a high compression piston bc you will fry it.

[Cholmes11]

I would but I have no clue where to get av gas. Atleast vp I can get at my local dirtbike store

[jgrimes59]

Yeah but it's stupid expensive. You can get av gas at the airports or independent pump stations. Is there anywhere around you that sells race fuel like 104 or 110. I would ask around. The bike is set for 93. Av is actually 96 so it's ok to run. I know too many guys running oxygenated fuel on a stock compression bike that melted the piston. Especially if you are on the throttle and rev out a lot.

[rcmxracing]

Read this right here:

http://motocrossactionmag.com/news/racers-guide-to-the-hierarchy-of-motocross-racing-fuels-2

[slowgs2001]

Check out Torco 100 uL. I been running it. Love it

[BDubb106]

Have you considered AV fuel? Also known as 100LL. It's very clean burning and doesn't have the crap like the pump has. I've been running it for years. I wouldn't run anything hotter than 100 octane unless you have a high compression piston bc you will fry it.

Octane rating has nothing to do with how hot a fuel burns. 

 

Anyways, you are spot on about the 100LL. It is a great alternative to pump after you factor in price and the consistency of the fuel. 

 

Cholmes... I would 100% suggest using a race fuel or at minimum cut your pump fuel with it. It doesn't have to be super expensive to work though. Also search around for local people that have it and ask about a little help. I found a dealer about 10 mins from my house that sells to me for 1/2 price just to run their name on my bike as a form of advertisement. I am currently paying less for a gallon of 110 race fuel for cheaper than a gallon of 93 for my truck! I'm getting it for $4.15 per gallon. I'm not saving money by cutting my race fuel so I run it straight. You may need to have your ECU remapped again depending on which fuel you decide to run. It is a little more expensive but 100% worth it IMO.

 

I don't run it for performance gains, I choose to run it for consistency, cleanliness, engine protection and of course the smell ?

Edited June 4, 2014 by BDubb106

[jgrimes59]

Ahhh yes! The smell!

[Cholmes11]

I just picked up some vp T4. I figure since my motor is stock besides a pipe that it would be good. I was close togetting vp U4.4 but I heard lead is bad for valves.

[BDubb106]

Lead is good for valves... it is a lubricant. Horrible for sensors though. That is where you have to be careful. If you run an auto tune it is out of the question. I have run leaded fuel in my bike since day 1 though.

Edited June 5, 2014 by BDubb106

[jgrimes59]

I usually put a couple ounces of marvel mystery oil in with mine just for good measure.

[McCrimon112]

Tried VPR once and it did ok. I'm not sure if my second can was a bad batch, or maybe it was the crazy heat here in the South, but the bike would lean pop once it got hot, go down on power, and generally run awful. I didn't experience this with the first can. I even tried alternating couplers to see if it was a mapping/oxygenation issue, but no luck.

Like I said, I'm not sure if it was the fuel boiling or a bad batch, but I went back to 93 octane Shell V Power and she's been running great ever since. I got a lot more bang for the buck there. I just wish it smelled as good!

[moto867]

You want to run as low an octane as you can without detonation. You can run pump gas up to 13.5:1 on a 450. If you want power the only way to get it is with oxygenated fuel. If you want consistency then shoot for something that is going to be readily available so youre not switching all the time. Nothing over 100 octane, preferably as close to 93 as you can

[Cholmes11]

Well I just ran the vp fuel yesterday at the track. It was noticeable more responsive off the bottom but did lean pop a little and was harder to start.

[BDubb106]

Which fuel did you choose and which plug are you running? Do you know what fuel trim and ignition settings look like on your ECU since it was remapped?

Edited June 8, 2014 by BDubb106

[Cholmes11]

Vp T4. It was over 100 at the track so I think it was running a little lean. It wasn't popping bad only a few times. But the starting was hit or miss. It would fire first kick or sometime would take a few kicks. Mapping wise I just have the preloaded map from the Pim 2.

[BDubb106]

Ahhhhh... that is a very possible cause to your issue. May want to try a few other maps. They have a map for just about any set up including stock motor with pipe and race fuel. 

[Cholmes11]

Anyway how I can download them? I went on there website and it's a little confusing.

[BDubb106]

What year is your bike? Ill find a link for you. I have it bookmarked on my computer so I know how to find them. 

 

EDIT:  NVM the link no longer works... give them a call or shoot them an email and let them know what mods you have. They will send you the map you are looking for.

Edited June 9, 2014 by BDubb106