Unless your riding is done at and over 10k rpms or your engine is moded,its a waste of $$.

 

Thanks for the info guys. I was just curious.

 

I even run regular unleaded in my race bike, it does not need it so why waste the money.

 

Not too far off the subject but I've heard that if you leave race gas in for an extended period of time it will eat away at seals and will leave a residue when it evaporates that will clog up your fuel filter. Anyone heard of this before?

 

I run VP U4 on race days (12 bucks a gal) and I can feel a difference in the 636. Maybe a few ponies but that's about it.

 

as they told you higher ocatne number wont make a differnace if your bike if it is not moded.
On the other hand oxganted fuels like Ultimate 4 (U4) will give you more power and will affect your air/fuel ratio.

 

Not too far off the subject but I've heard that if you leave race gas in for an extended period of time it will eat away at seals and will leave a residue when it evaporates that will clog up your fuel filter. Anyone heard of this before?

i heard the same thing from a local dealer he says if you use race gas (leaded) to run it out in a day or two with pump gas. not to sure on unleaded race gas

 

On a non engine modded bike, you should actually lose a slight amount of horsepower over regular gas. Reason is the race gas burns slower and therefore on a non modded engine, doesn't burn competely. Still smells sooooooo good though.

 

On a non engine modded bike, you should actually lose a slight amount of horsepower over regular gas. Reason is the race gas burns slower and therefore on a non modded engine, doesn't burn competely. Still smells sooooooo good though.

Not entirely true.. Some race gases like U4 are low octane, oxygenated fuels that will give a pretty good improvement on even a stock bike. Fuels like c-12 and the such however will not really help unless you have altered compression.

 

the only way any type of higer octane race fuel will help an R1 is if its ECU actively uses a knock sensor to constantly alter the ignition timing based on knock count. otherwise, like has been previously said......higher octane fuel burns slower, and will make LESS power. the object of higher octane fuel is to be able to run higher ignition advance without detonation/preignition.


I havent really read up that much on what exactly the ECU looks at to determine its igntion maps, but im guessing it isnt that advanced.


If you had a way to alter the timing maps though......you could benefit from it.

 

no difference period, unless you have changed the compression ratio or cam timing, thusly, race fuel is designed for such apps and or changes, if anything, you get a cleaner burn, smells cool, white tipped exhaust, emptier wallet..

Im intrested in your comments on white tipped exhaust I am running my track only modded engined 99 R1 on a 50/50 mix of avgas and super unleaded and noticed the exhaust is lighter than usual !! I thought it is a sighn of lean running ??????
Martin would value your input on this one ?

 

Old post but I would like to re-visit.. My buddy at the local Kawi shop let me have some free time on the dyno today. I didn't get any dyno sheets to post but I got some interesting results with race fuel. My first 2 runs were with unleaded 93 octain. 1st run was 156hp, engine temp around 180, outside temp low 50's and damp (raining). 2nd run was 158hp, engine temp around 200, same outside temp. My gas light came on so I added 1 gallon of Klotz 114 octain leaded race gas. That puts the mix at 50/50 93 unleaded and 114 leaded. My 3rd and 4th run were both 160hp, engine temps were the same as well as outside temp. This was the first time I had my R1 on the dyno and I'm very happy. I really didn't expect to see numbers this high based on what I've read. I really don't care about the figures but it's nice to know. Anyway, I've read posts that say race fuel doesn't do anything unless your engine is modded. Well, I beg to differ.. I made 2hp more with just a 50/50 mix. Can anyone explain this?? Also, I read in my manual that running leaded gas will cause permanate damage to pistons, rings, valves and cat. I've run a slight mix before, but most of the time I only run 93. Did I just kill my engine by running leaded race gas?? I know many racers that use it on a regular basis in FI bikes, is the R1 different?? :dunno

 

93 unleaded is a bit low for the R1 engine...........where i live we get 96 from the pump. For a 12:1 compression ratio engine i wouldnt go below 95.
I am sure that a bike like the ZX-10R with 12.7:1 ratio would benfit from race gas .

 

And yah........I never had Unleaded gas in my bikes, never had a problem!

 

93 unleaded is a bit low for the R1 engine...........where i live we get 96 from the pump. For a 12:1 compression ratio engine i wouldnt go below 95.
I am sure that a bike like the ZX-10R with 12.7:1 ratio would benfit from race gas .

Wow.. 94 is the highest I can get at the pump and that's only at Sunoco. Everywhere else 93 is the highest.

 

And yah........I never had Unleaded gas in my bikes, never had a problem!

That's good to know. So you only run leaded gas in your 04 R1??

 

And yah........I never had Unleaded gas in my bikes, never had a problem!

Anyone else only run leaded race gas??

 

Hey guys,

I wouldn't run leaded gas in your bike. I am a helicopter mechanic and our engines (piston powered) use 100 LL (low lead). I gotta tell ya, engines look like crap one we pull the cylinder off. There is a lot of lead deposit around exhaust valves and on the piston itself. Lead in the gas acts as a lubricant and significally lowers the detonation characteristics of the gas, but it leaves deposit in the combustion chamber. On a big engie (Lycoming IO540, about 8800 cc) this is not a really big problem, but on a 1000cc R1, I dunno...just my .02. It can also foul the sparkplugs and on FI cars ruins the O2 sensor. Regulat pump gas is more that fine. I have a 99r1 and use 87 regularly,,,

 

And yah........I never had Unleaded gas in my bikes, never had a problem!

not the same octane rating.

in the US we use research +Motor/2 or average the two.
You use research which is always higher.
:fact

 

Hey guys,

I wouldn't run leaded gas in your bike. I am a helicopter mechanic and our engines (piston powered) use 100 LL (low lead). I gotta tell ya, engines look like crap one we pull the cylinder off. There is a lot of lead deposit around exhaust valves and on the piston itself. Lead in the gas acts as a lubricant and significally lowers the detonation characteristics of the gas, but it leaves deposit in the combustion chamber. On a big engie (Lycoming IO540, about 8800 cc) this is not a really big problem, but on a 1000cc R1, I dunno...just my .02. It can also foul the sparkplugs and on FI cars ruins the O2 sensor. Regulat pump gas is more that fine. I have a 99r1 and use 87 regularly,,,

Thanks for your input..

 

not the same octane rating.

in the US we use research +Motor/2 or average the two.
You use research which is always higher.
:fact

Sorry.. What does that mean? :dunno

 

Sorry.. What does that mean? :dunno

Research Octane and Motor Octane are two different ways of testing the octane rating of a fuel.
Octane is the resistance to burn of the fuel. Thus the higher the octane the higher the resistance to burning of the fuel.
Higher octane fuel is desireable to stop pre-ignition (igniton of the fuel before the spark) and detonation (ignition of the fuel due to a hot spot in the cylinder)

To simplify, research numbers are chemically tested numbers, and as such are the absolute best that particular blend of fuel can ever achieve. Thus the number is high, say a 98 or 102.

Motor octane is derived by running it in a control motor and listening for detonation or preignition(pinging). Since the control motor can have the compression ratio varied and the inside engione temperature varied, it will react to minute changes in octane, thus the number will be lower, say 84 or 86.

In the United States, all pump octane num,bers are derived by the simple average of the two octane numbers (R+M/2) so that octane numbers cannot be misrepresented to the unknowing public.

Many other countries, including much of Europe, Australia and parts of Africa, have settled on the research number as the basis.
However, since octane is lost as a fuel sits, the research number can vary more than an average of a high and low number.

R=102 minus 5%=96.9 loss of 5.1
m+84 minus 5%=79.8 loss of 4.2

Its all a numbers game, just need to decide which numbers you want to use.