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Old 05-09-2005, 02:25 PM   #1
Solracer
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Dyno post for Bejon

..
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Old 05-09-2005, 02:47 PM   #2
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Re: Dyno post for Bejon

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Old 05-09-2005, 03:19 PM   #3
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Re: Dyno post for Bejon

got mine done saturday, it was a bit dissapointing but it is running real rich, and it needs a tune up,,, filter cleaning, check the plugs, sinc the carbs, and what ever else.. but overall it was ok ....
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Old 05-09-2005, 03:38 PM   #4
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Re: Dyno post for Bejon

thats awesome. but why did u do 9 runs? just to see consistency or what?

i just need to do 2. One before my pcIII and one after its installed. I'll probably just install it right there, bring my tools with me, cause its 40 miles from my house.
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Old 05-09-2005, 03:57 PM   #5
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Re: Dyno post for Bejon

did mine at HoH for $30 did 5 runs...
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Old 05-09-2005, 05:02 PM   #6
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Re: Dyno post for Bejon

so much closer, thanks for that input carbonR1
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Old 05-10-2005, 01:56 AM   #7
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Re: Dyno post for Bejon

Quote:
Originally Posted by CarbonR1
did mine at HoH for $30 did 5 runs...
30 for 5 eh? thats good.!
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Old 05-10-2005, 01:58 AM   #8
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Re: Dyno post for Bejon

Quote:
Originally Posted by CarbonR1
got mine done saturday, it was a bit dissapointing but it is running real rich, and it needs a tune up,,, filter cleaning, check the plugs, sinc the carbs, and what ever else.. but overall it was ok ....
yeh, need to retune and lean mine out a bit more also..... did they use a gas anylyzer on your bike?
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Old 05-10-2005, 07:08 AM   #9
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Re: Dyno post for Bejon

Quote:
Originally Posted by Solracer
Quote:
Originally Posted by CarbonR1
got mine done saturday, it was a bit dissapointing but it is running real rich, and it needs a tune up,,, filter cleaning, check the plugs, sinc the carbs, and what ever else.. but overall it was ok ....
yeh, need to retune and lean mine out a bit more also..... did they use a gas anylyzer on your bike?
i guess, they stuck some copper tube with a hose attached to it into the pipe before he started so i assume that is what it was,, ,.

yeah it was pretty cheap, the only badk thing about the whole deal was that the dyno was a dynojet.. that i didnt like too much, but nevertheless it was fun havin it dyno'd.. and it was pretty cheap also... the power that the dyno said it was making may not have been 100% accurate but at least i know that it is running rich and needs to be adjusted...
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Old 05-11-2005, 03:42 AM   #10
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Re: Dyno post for Bejon

once again, why is it that u get so many dynos at one time? is it to see consistency, or do u actually tune the bike in between dynos?
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Old 05-11-2005, 06:36 AM   #11
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Re: Dyno post for Bejon

Well, yeh, you can tune it inbetween. On yours if you had a Power commander it would be easy and cheap to tune yours, on my carbed bike however, its not so easy and not cheap to have the guy tune min eon the fly. Now of course half of my runs were done on race gas. and other half was 93.
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Old 05-11-2005, 12:41 PM   #12
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Re: Dyno post for Bejon

did the octane diff. make a power diff.. prolly not much..
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Old 05-16-2005, 02:57 PM   #13
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Re: Dyno post for Bejon

probably not much, i wonder if i put 87 octane like suggested if it will be the same as 91/93 octane.
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Old 05-16-2005, 03:50 PM   #14
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Re: Dyno post for Bejon

its not all in the octane ,the "ultimate 4" is only 92 octane, but its leaded and oxygenated, the "103" from VP that im running now is 98 oct, oxygenated and unleaded.

price diff is Ultimate 4 is 8/gallon
103 is 6/gallon

and so far i think the 103 is just as good for my bike.
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Old 05-17-2005, 12:47 AM   #15
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Re: Dyno post for Bejon

our bikes can run leaded fuel?
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Old 05-17-2005, 07:15 AM   #16
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Re: Dyno post for Bejon

you should at least run a 90 or 90+ octane
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Old 05-17-2005, 12:14 PM   #17
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Re: Dyno post for Bejon

Quote:
Originally Posted by Bejon
our bikes can run leaded fuel?
yes sir. You dont have an o2 sensor now do you?
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Old 05-18-2005, 07:00 AM   #18
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Re: Dyno post for Bejon

but sol there s are reason the ama boys are running ultimate 4 and theres a reason it costs more. Cause it's better and is hp in a bottle.
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Old 05-18-2005, 11:50 AM   #19
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Re: Dyno post for Bejon

Well, I agree, the diff in just changing fuels is remarkable, but Im going to dyno the bike with both fuels and see what happens because the " dyno" reads that it isnt much more of a power dff if any between the two fuels (Ultimate 4 and "103" )..... Stay tuned.
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Old 05-31-2005, 10:55 AM   #20
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Re: Dyno post for Bejon

For what it's worth, here is a good read on different types of gas.* Don't waste your money on race gas unless you've done lots of internal engine mods.* If you're just running pipe & power commander stick to super unleaded pump gas...

Quote taken from RC51.org
Quote:
We've pretty much done the homework for you when it comes to testing various grades & brands of race fuels in the RC51 (or any other motorcycle for that part)
In hours & hours of dyno testing & Powercommander map building several key points were discovered some we intentionally set out to test others just came about on their own:

1. Standard Race Fuel (VP C12, C14, Sunoco 104, 100LL AvGas even high octane pump gas 96 or 100) ran straight on a stock RC51 motor will actually lose horsepower.

This is argued by many because the throttle response becomes crisper & is often mistaken for more performance when in truth the bike is making less power on the dyno sometimes by as much a 4-6hp. Many race fuels are designed for higher compression engines >13.0:1 & simply do not perform well in low compression motors like our RC51 (10.8:1). As has been noted many times on just about every sportbike forum on the net more octane does not mean more power! It simply means more resistance to detonation. If a higher octane fuel happens to make more power in a motor it is because of the additives in the fuel having the potential for more energy not just because it is higher octane.

What can be beneficial, but not always so is a blend of about 25/75 of race fuel & pump gas (1 gallon of race fuel added to 3 gallons of premium pump gas) which has been shown to consistently yield a horsepower or two. However I strongly urge you to stay away from the race fuels on a street bike if for no other reason than the extra contaminants it will leave in your motor. For me the cost of premature wear on the motor is not worth the negligible horsepower gains.

2. Oxygenated Race Fuels (Nutec #4, VP MR1 etc) can add 3-5hp without any fuel or mapping changes at all & 5-10hp sometimes even more on a stock motor with proper mapping & lots of playing around with the ignition timing. Some oxygenated fuels benefit from retarding the ignition while others benefit from advancing it.

The catch is that A. the stuff is really expensive usually about $15-$20 a gallon & B. it is highly corrosive & must be drained from your tank after each race weekend to keep it from eating parts of your fuel system. There are also horror stories of racers getting a bad batch of the stuff & ruining a set of carbs or throttle bodies due to a varnish that settles onto the components that is basically impossible to remove. I have actually witnessed this myself once & could not believe how bad it actually was.

There are some newer oxygenated fuels out now such as VP MR9 & Ultimate 4 which is claimed to be much less caustic to fuel system components (o-rings, gaskets etc..). I have sampled the MR9 & was very impressed with the performance, but have not tried the Ultimate 4 yet.

3. In testing various grades of pump gas I consistently found that 87 octane fuel makes 1-2 more horsepower than those exact same bikes ran on Premium 93 octane. We tested five liter class motorcycles (97 CBR900RR, 02 Honda 919, 2000 RC51, 2000 GSXR750 & an 02 R1) & only the R1 seemed unaffected by the octane of the fuel. Now I am certainly not going to tell you to run less than the recommended octane (92) in your RC51 as the specific needs of the motor dictate that a higher octane fuel is needed, but the results are blatant in that more octane does not mean more power.
It is only fair that I note that when testing the pump gas on some of the 600's (Yamaha R6 & the GSXR600) the inverse was true in that they did lose a little horsepower on the 87 octane vs the 93 octane. Most likely because of the higher compression ratios of the smaller motors, however the CBR600F4i gained a little horsepower.

Additional notes (not tested on the dyno): Never add any type of octane boosters or fuel system cleaners to your motorcycle tank. Additives sold in auto stores are designed to treat anywhere from 16-22 gallons of fuel from one small bottle of concentrate & more often than not those chemicals are very hazardous to your motorcycles fuel system especially if the mix ratio is not absolutely perfect. I cannot tell you how many carb jobs I have done over the years because some yahoo dumped half a bottle (or more) of octane booster into his fuel tank. The bike runs great for awhile but within a day or two a varnish starts to set up on the fuel system components & it just gets worse from there. Run quality fuels & stay away from the additives period.
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