Hi guys, and gals. I'm just curious if you use a higher octance can it do damage to the motor. I'm talking about 100 or 112 octane. Will you feel a difference from pump gas? I like to do runs at TMP and want to know if it would help a little. I have a 2007 gsxr 600. I don't want to hear about how its a waste of money and what not so if your going to ***** please keep your comments to yourself, thanks.
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gas...
- Thread starter cheeser
- Start date
89 max for that bike, if it's stock, 112's not the best thing to be loading 'er up with.
Manual says what, 87?
@S500K........they sell it (112) at TMP.
invictus43
Well-known member
If you purchase oxygenated race gas you will probably see a modest increase in power (5% maybe..). The octane rating is not necessarily a factor since you don't have a knock sensor to detect detonation anyway. If you want to spend time to tune your engine timing or increase compression ratio or valve timing, you can get more power without detonation using higher octane race gas. Be careful though, you bike has a catalytic converter I believe and you can purchase either leaded or unleaded race gas. Higher octane ratings (110-112) generally use lead as a way to prevent detonation. Lead will kill you cat over time. You don't really need 110-112 on your bike if it's stock, just use the unleaded race gas with an octane of 96-100 and you'll see some improvement. Some of the better race gas also will require you to adjust your fuel mixture so be careful that you don't lean it out and burn anything.
My opinion, if your bike is stock, use Shell 91 and leave it at that.
My opinion, if your bike is stock, use Shell 91 and leave it at that.
Car2Slo
Well-known member
I've been told, on the street from racer buddies, that high octane gasoline in particular with high levels of ethanol will eventually cause damage to internal seals like injector seals. Not sure if this is true but I occassionally toss in a tank of 91 octane between my 94 octane fills. I suspect the effect is amplified with race gas.
invictus43
Well-known member
Most new bikes are good with your typical 10-15% ethanol content. Some race gas (like some of the unleaded VP fuels) have ethanol for octane but I don't now what percentage it is. I suspect less than pump gas. Honestly though, on a stock bike with no tuning, I don't think you'll see much power increase with race gas. Maybe 5%..tops.
skip
Well-known member
Honestly, it will be a waste of $ with little gains in you bike. If you are running an unmodified engine I think your compression should be around 12.5:1 which is just fine running on pump gas. The 112 octane fuels are meant for bikes with heavily modified engines or purpose built race bikes like my little weed wacker that is pushing close to 16:1 compression. If you use a race fuel closer to the octane recommendation (which is 87 for you bike iirc), like VPs MR12, you may see some benefits but I think they would be fairly modest. Probably push faster times just by improving your launch.
edit - didn't answer your first question. No running a higher octane will not damage you motor.
edit - didn't answer your first question. No running a higher octane will not damage you motor.
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Don't think you can even buy leaded race fuel in Ontario anymore."Pro Fuel" http://www.profuels.ca/ sells 110 (Mark 2) at $3.20/l and they supply the racers at TMP.Like the others said,use what your manual suggests.
You can still get Leaded race fuel
VP MR9, MR12, and U4.4 are all oxygenated, leaded fuels.
The leaded stuff will not harm your engine at all.
VP MR9, MR12, and U4.4 are all oxygenated, leaded fuels.
The leaded stuff will not harm your engine at all.
...but it will harm his cat if he has one. Even the metal in that thing is worth good in scrap ie. platinum, palladium, rhodium
As for OP, if your engine is not built for it why throw money away? Are u falling into the marketing hype?
What is your engine compression by the way????
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invictus43
Well-known member
Just to be clear, compression ratio alone is not the only consideration when deciding which octane fuel you need. Combustion chamber design, piston design, engine timing, valve timing, boost pressure...these all can affect octane requirements. For the most part, with most modern bikes, it's mostly compression ratio so I'm not disagreeing with you.
There are fuels that are specifically designed to make power, even in OEM engines.
invictus43
Well-known member
Absolutely..pump gas is a compromise..clean burning, easy starting, low volatility, cheap..so there is some power to be gained from better fuel for sure.
OP what are you looking for? more hp?
It will not harm your engine nor will it do any damage to your cat's, really a few runs at TMP, is not going to cause any type of buildup.
It will give a bit more HP, the question is will you be able to utuilize that hp for better times etc.. my guess is that no, you wont.
When your talking about micro stuff, its a combination of everything, with rider skill being the most important variable for better times.
Run it once or twice and see for yourself if its worth paying the extra $ for race fuel.
It will not harm your engine nor will it do any damage to your cat's, really a few runs at TMP, is not going to cause any type of buildup.
It will give a bit more HP, the question is will you be able to utuilize that hp for better times etc.. my guess is that no, you wont.
When your talking about micro stuff, its a combination of everything, with rider skill being the most important variable for better times.
Run it once or twice and see for yourself if its worth paying the extra $ for race fuel.
MR12 is the way to go
frekeyguy
Well-known member
How much is MR12 now? And why is MR12 bettter?
MR9 is expensive, but its like rocket fuel to me....dam!
MR12, is more expensive,, but makes better power that MR9.
MR12 was formulated to replace and outperform MR9.
frekeyguy
Well-known member
...wish it was cheaper.....even MR9
...gotta selling some drugs or something to afford this stuff....
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