Race Fuel for the 1/4 - Kawasaki ZX-10R.net
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post #1 of 29 Old 06-14-2016, 05:28 PM Thread Starter
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Race Fuel for the 1/4

So, i've been kickin around the idea of running U4.4 in my bike when at the drag strip. My bike has OE header cat delete and mid-pipe delete with slip on, PC5, wideband commander and the usual bolt on suspension stuff for drag racing.
I have a few questions though. A buddy I race with has a gsxr1000, with similar setup as my bike, he runs U4.4 in his and loves it. It seems most people these days are running MR12. I've found they're both oxygenated, MR12 is a 93 octane and U4.4 is 103. Aside from the octane difference and about $10/gal price difference, what are the pros and cons to running U4.4?

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post #2 of 29 Old 06-14-2016, 06:56 PM
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I'm sure someone with more experience will chime in, but higher octane is to prevent premature detonation in higher compression systems (like if you have a turbo or supercharger). Not sure that fuel would help you at all, may even be detrimental. Regardless, would definitely require tuning/ecu flash.

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post #3 of 29 Old 06-14-2016, 07:05 PM
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Bored so researched the fuel some. General consensus on the net seems to be what I thought, that with a stock motor you won't see any gains over 93 octane since you need a higher compression ratio to take advantage of it.
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post #4 of 29 Old 06-14-2016, 08:06 PM
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On NA motors I see a -lot- of guys going fast on MR12, but it is a really maintenance heavy fuel. If you can live with the cost/draining/shelf life it is the way to go on an NA motor, but you need to tune for it as well. I'm sure Gaz can chime in on that. :)

Attack life... it's going to kill you anyway.
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post #5 of 29 Old 06-14-2016, 08:09 PM
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if not tuning for either of these specific fuels, try the u4.4, much closer to a pour in fuel than mr12. seen some et/mph improvements with u4.4 untuned, just depends. if u want to get serious, mr12 with a custom tune for it. mr12 is 87 octane.

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post #6 of 29 Old 06-15-2016, 06:35 AM
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what spaz said. everything about mr12 is different from other fuels. date of manufacture on can must be within 6 mos, earlier if possible. once opened 2 mos max life to be effective. seen 3 hp loss in 4 weeks once opened dyno verified.must be tuned, tuned in low/mid range big plus. must be drained/flushed after use which has become simple to do for me. basically nasty stuff requiring some maintaince as stated. 10+hp in midrange, 8 up top, couple ft lbs torque, is gonna cost a little, require a little work. this is what we average on the dyno everytime. relatively fresh, very consistient fuel. zx10's love this fuel, they just rip thru the gears when well tuned on it. u4.4 requires almost same guidlines, little better shelflife all around. both good fuels, as ur friend u will run good on u4.4, u will haul ass on mr12. i go thru 3-4 cans a season. racing is expensive, the look on the face of those busa/14 riders after u walked away from them down the track on a ten is priceless.
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Last edited by gazx10; 06-15-2016 at 06:49 AM.
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post #7 of 29 Old 06-16-2016, 12:09 PM Thread Starter
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thanks for the advice and info. I have a MR12 tune another member sent me, so, if I decide to use oxygenated race fuel, I'll change the map and get some data from the runs and go from there.

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post #8 of 29 Old 07-10-2016, 08:33 PM
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I run MR12 for the strip it makes the most power by far. Not too much of a pain really. Just takes about 20 minutes before and after the trip to the strip to drain and replace the fuel. It is pricy like stated. But like gaz said, racing is expensive. The way I saw it if I was going through paying for a tune and race gas and what not I was going to get the most out of it even if it's a little more each trip to the strip


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post #9 of 29 Old 10-26-2016, 09:09 PM Thread Starter
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I admittedly am very ignorant to oxygenated race fuels. I had my first go at running some over the summer. I've been looking into U4.4 but i'm wondering how much power i'm losing by running U4.4, since it is a 103 octane oxygenated fuel. Comparing to MR12, which I believe has more oxygenates in it compared to u4.4 but also has a lowered octane rating at 87.

Is there a middle ground? Like an oxygenated 89 or 91, maybe even 95??

'08 10R, Lime/Black
Flashed ECU, PC5,WBC, custom shift light, shifter w/co2, side winder, BMC race, lowered, stretched,-2/+4, velocity stacks, little spray, nos mini.....
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post #10 of 29 Old 10-27-2016, 07:36 AM
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Since gazx10 is great at explaining stuff I won't even try explaining more than he did, but figure'd I'd add my experience.

I put MR12 in my bike 2 years ago and picked up what seemed about 2mph and .2. Not sure how much I'd pick up now with a little more seat time but that was definitley worth the hassle to drain the gas and retune. If going for every little bit I'd say get some mr12 if you're all motor.

I love the smell of mr12 from the exhaust, hate the smell from the can in the garage lol
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