Anyone heard oh HP loss with extended swingarm? - Kawasaki ZX-10R.net
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post #1 of 11 Old 08-02-2007, 10:21 PM Thread Starter
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Anyone heard oh HP loss with extended swingarm?

Hey guys well since I'm new in O-town around here I got to meet up with trey and a guy had a mobile dynojet 150.....Ive never had my bike on a dynojet before and was curious to see what kinda power it made and it wound up throwing down 160hp....

now for my mods it seemed kinda low and the guy said that he has seen 8-10hp loss with an extended swingarm???

anyone heard of that? I know on our factory pro it doesn't mater what you do from gear changes to swingarm length but just wondering.

P.S. Treys bike is pretty sick!!! lol
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post #2 of 11 Old 08-02-2007, 10:27 PM
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A lot depends on the motion ratio from axle centre line to shock travel, if you have a lot of squat in the bike then you are using power to keep the suspension compressed, bit like holding the brake on whilst you let out the clutch you stop forward motion but the bike sits down, let off the power and it rises again.

Reduce the squat and you get more tractive effort at the wheel.
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post #3 of 11 Old 08-02-2007, 10:30 PM
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Dang Trey you will hang out with anyone... j/m Garth
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post #4 of 11 Old 08-02-2007, 10:31 PM
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Theres a good reason you see hardtail drag bikes, they let the tire do the work and not a shock.
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post #5 of 11 Old 08-02-2007, 10:34 PM
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Yes you will see some power loss....

There is more load on the motor with a swing arm like that....

I use to race prohill climb and my race bikes all had extended swing arms.... Yes they lost quite a bit of power from stock form... kinda strange how that works...

.
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post #6 of 11 Old 08-02-2007, 10:34 PM
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i havent heard of the trig effecting the output on a dyno. but with the extended swing arm your leverage is dif which effects how your power delivery is read. my .02. i thought you were talking about puttin down 190hp!? hows that 16/40 set up, you ever consider 16/41?

1ST GEN-10R 234hp/[email protected], GT2871RS, cometic gasket, tial bov/ex wastegate, BEGI FMU, WALBRO fuel pump,falicon clutch basket,race pak clutch,200/50 pilot,yana-shiki levers,.net wristband, WEGO III,PC3,GPR damper,cbr cals/Galfer SS brake lines,gp shift,1/5 throttle, 2NDARIES REMOVED <<click for how-to, *R.I.P D.J 10 Apr 04*

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post #7 of 11 Old 08-02-2007, 10:36 PM Thread Starter
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well i dont plan on leaving it extended for long anyways! lol I'm gunna try and find a real good swingarm for sale one of these days and swap it out....

well the bike still hauls major ass lol espically geared -1 front +1 rear and all the extra power...... I'll have to do a roll on with trey and compare :-D

I believe his bike made 155 on the same dyno
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post #8 of 11 Old 08-02-2007, 10:39 PM
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Its not trig its geom or even kinematic, if you put a deadlink in place of the spring you will see a higher reading but still some losses depending on the angle of the swingarm and how stiff it is.
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post #9 of 11 Old 08-02-2007, 10:45 PM
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Quote:
Originally Posted by FAF View Post
Its not trig its geom or even kinematic, if you put a deadlink in place of the spring you will see a higher reading but still some losses depending on the angle of the swingarm and how stiff it is.
thats a good idea

1ST GEN-10R 234hp/[email protected], GT2871RS, cometic gasket, tial bov/ex wastegate, BEGI FMU, WALBRO fuel pump,falicon clutch basket,race pak clutch,200/50 pilot,yana-shiki levers,.net wristband, WEGO III,PC3,GPR damper,cbr cals/Galfer SS brake lines,gp shift,1/5 throttle, 2NDARIES REMOVED <<click for how-to, *R.I.P D.J 10 Apr 04*
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post #10 of 11 Old 08-02-2007, 10:46 PM Thread Starter
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on a good note my rev extend is defintly working great, the guy was liek i was gunna hold it longer but didnt know when the limiter would hit....I forget what im geared to now but i think mid 170's
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