Will 87 make more power than 93 or race gas? - Kawasaki ZX-10R.net
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post #1 of 15 Old 08-22-2012, 05:40 PM Thread Starter
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Will 87 make more power than 93 or race gas?

Having my bike tuned this Sat.
Hey guys. Sat I'm going to Lake Charles, La to Third Coast Speed to have my bike tuned. They're a very reputable shop and I know several people who have had their bikes tuned by them. But here's the thing... I talked to him about tuning it on race gas. (I'm stock motor, no spray) He said that I didn't need race gas and that I would actually make more power on pump 87. Does this make sense to anybody? If so, please explain that to me. If not, should I just tell him to tune it both ways and see what makes more power?
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post #2 of 15 Old 08-22-2012, 05:52 PM
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yes your bike will make more power with 87 pump bc its burns faster. ive seen 2-3 hp on the dyno same bike with 87 vs 93. now if you got deep pockets you will make more power with oxygenated race gas but will need to retune and drain gas after or it will eat your pump up.

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post #3 of 15 Old 08-22-2012, 05:58 PM
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I don't get it!


Is it only my bike that has a sticker that tells me to use 90 octane or higher gas only?


Ooops! Perhaps you are talking something other than the Gen4, ignore me, I'll get my coat!

Rob

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post #4 of 15 Old 08-22-2012, 06:01 PM Thread Starter
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That's pretty wild! So I guess I would just run 87 all the time after I get it tuned, huh?
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post #5 of 15 Old 08-22-2012, 06:07 PM
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That's pretty wild! So I guess I would just run 87 all the time after I get it tuned, huh?
my gen1 made more power with 87 and i run it all yr round never experience any problems.

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post #6 of 15 Old 08-22-2012, 06:10 PM
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That's pretty wild! So I guess I would just run 87 all the time after I get it tuned, huh?
Nitroglycerine makes even more power. I think you should use that instead.
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post #7 of 15 Old 08-22-2012, 06:11 PM Thread Starter
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Cool. Thanks for your input.
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post #8 of 15 Old 08-22-2012, 06:14 PM
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While they are right, they are still leaving a fairly important part out. 87 will make more power because it burns faster/easier/at a slightly lower temperature, however, that's only of you don experience detonation. The high compression ratios of these bikes create high internal cylinder temperatures. Compressing air and fuel causes them to heat up just by the nature of the beast. And with high CR's and low octane fuel, it sometimes gets too hot, and the fuel burns before TDC, before the spark plug fires. Pretty bad for just about all your motor's internals. So if you can run it with no pinging, you will make more power. Sometimes you can even run it seemingly with no problems, but then when you start to really hammer on it a lot, that's when it start to detonate.


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post #9 of 15 Old 08-22-2012, 06:48 PM
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If I recall correctly you're running a stock motor and looking for low 9s/high 8s, in which case 87 is going to yield the most power when compared to premium pump and in most cases 100+ octane NON-oxygenated race fuel. I've ran 87 in my gen3 w a thin HG and decked head w no detonation issues.

However, if you want to get the most power out of it, get yourself some MR12 oxygenated/leaded race fuel. Will put down a lot more power than any pump fuel.

That being said, it is kind of a pain. You'll want a map switch for a second map if you street ride so you can switch back to a pump gas map. And as previously stated, mr12 needs to be drained after racing or it'll eat apart your fuel system. Also very pricey at around $125 per 5 gal can on average.
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post #10 of 15 Old 09-25-2012, 11:22 AM
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However, if you want to get the most power out of it, get yourself some MR12 oxygenated/leaded race fuel. Will put down a lot more power than any pump fuel.

That being said, it is kind of a pain. You'll want a map switch for a second map if you street ride so you can switch back to a pump gas map. And as previously stated, mr12 needs to be drained after racing or it'll eat apart your fuel system. Also very pricey at around $125 per 5 gal can on average.
What method do you use to drain the fuel out of the tank at the end of a race day if you are using a fuel like this?

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