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As i always say... You da man!!! Ive been itching to see if i gained bigger numbers with my lighter wheels. Im still going to find out for myself.
 

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I think I could get ALOT more hp for $4000! :badteeth:
yup you can buy a turbo or supercharger and get a shit load more but your also getting better braking and handeling with the lighter wheels...:badteeth: The bling factor is nice as well.:wink:
 

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Good post, thanks for the info.

Do you know if the "after" included ceramic bearings also?
 

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Bloo Moderator
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Yeah....but doesn't it depend on the dyno type? :dontknow:....I thought I read something in a test(mag) about doing a 520 conversion will show higher #s. I also did a dyno on my old zx9R with tight chain....operator said I lost about 3hp right there......just saying it maybe the same thing. :wink:

bloo
 

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Remember HP is a calculated number. The lighter BST's showed a higher HP number because of less work required to rotate the wheel at said RPM. But to say it makes more power is a bit inaccurate. The engine still makes the same HP and Torque as stock. Just the numbers are skewed a bit due to the type of dyno and reduction in rotating mass.
 

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dont forget most all dynojet dynos are run under acceleration tests and not load testing. This is simply a matter of this dyno graph showing a bike on a acceleromter pretty much...

none the less I believe rims will let you release more hp but this is just another way to sell wheels, people love hp numbers....

thanks for the graph!
 

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dont forget most all dynojet dynos are run under acceleration tests and not load testing. This is simply a matter of this dyno graph showing a bike on a acceleromter pretty much...

none the less I believe rims will let you release more hp but this is just another way to sell wheels, people love hp numbers....

thanks for the graph!
Remember HP is a calculated number. The lighter BST's showed a higher HP number because of less work required to rotate the wheel at said RPM. But to say it makes more power is a bit inaccurate. The engine still makes the same HP and Torque as stock. Just the numbers are skewed a bit due to the type of dyno and reduction in rotating mass.
yep....pretty much what I was getting from both posts.....nice thread though just was trying to get into a little more perspective of what it means. :eek:ccasion1

bloo
 

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>>>And if the drum is accelerating faster due to the wheel, its still a REAL increase in power.<<<

Not unless you're inventing new physics. It's not an increase in power. It's a decrease in inertia. In this case the rotating inertia of the rear wheel. Making the bike lighter won't show an effect on these kinds of dynos because the bike isn't being accelerated. The wheel increased in rpm so its inertia (moment of inertia to more exact) does affect the dyno reading. Since the dyno is only spinning the rear wheel, any improvement in overall acceleration due to the lighter front wheel won't be seen.

If a better dyno was used, one that can maintain a constant rpm, like this one: http://www.dynojet.com/motorcycle_dyno/250i_dyno/Default.aspx you could correctly distinguish between an increase in power and a decrease in rotating moment of inertia.

You should have paid more attention in physics class, but you probably thought it was totally irrelevant. Duh.
 

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Speed Freak
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Same RPM's, idle to 14K, just got there faster, NO INCREASE IN RPM as you state. Thus more work was performed. 6 more HP to the road. You cant change physics anymore than I.
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I do somewhat agree with you, but if you did this same test on a load cell dyno you wouldnt see any difference because its not measuring how fast you can spin a durm your measrung how much torque can be placed on a torque arm.

this dyno will help people see what kinda difference a set of wheels will make though :thumbsup:
 

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From what I can find, (admittedly mostly on the internet) most scientists agree that the laws of pyhsics, as we know it, would apply across the Universe. Thus, any aliens looking to come here would be bound by the unfortunate fact that light speed isn't possible as we know physics. Since we know there are no known habitable exo-planets, and probably not any in our part of the Galaxy, I would say it is a safe bet, there are no aliens on their way here as the void is to great to breach.

Maybe we need to find a way to increase the RPM's (as you state the case is) instead of how fast we get to the same RPM, but you duh, well you know. :rolleyes:
hey now, leave my alien friends alone! :lol:

actually I was watching a documentary on something to deal with psychics and they were talking about Einstein and how he even said he cannot tell you much about things like psychics in zero gravity :p sooo :thefinger

Aliens are here !!! .... lol

brb I have to go re-make my tin foil hat, I'm sure plenty of people think I'm crazy as is :p
 

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yes your are 100% correct.

as for actual horsepower numbers that the engine is producing wheels will not in a LOAD cell test produce a higher engine horse power number.

this is where the big debate lies between dynojet dynos and dynos like factory pro dynos which are strictly load cell dynos with a eddy current cell on board.

I cannot provide you with numbers bud, I havent ran the Factory Pro dyno in about 4 years, its sitting in my uncles drive way right now lol... to busy with my new awesome job of watching porn all day to fuck around in this S FL heat on bikes!
 

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Speed Freak
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If Aliens had the technology to cross the great distances, why then with this great technology do they always seem to crash land when they get here? I mean we can loand our spaceships pretty routine. If Aliens have this massive increase in knowledge over our own, and what it would take to cross the great voids, I doubt they would crash land everytime they get here.

NO, I dont care the thread has gone to shit,
they crashed in the desert because of all the radioactivity threw their systems off from all the nuclear bomb testing :thumbsup:
 

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Discussion Starter #16
they crashed in the desert because of all the radioactivity threw their systems off from all the nuclear bomb testing :thumbsup:
Have you noticed my post count has been reduced by nearly 2000 posts? I have been "reverse" post whoring. :lol:
 

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Ok now we are comparing apples and oranges here. In both statements "Lougots" and "Magic" are both correct. Real world application BST carbon wheels would show an increase in rate of acceleration due to less rotating mass. However what are we using a Dyno for? Are we using a dyno to measure an increase in engine power or are we using a dyno to show an increase in rate of acceleration? I have always perferred load test dyno's to accurately show engine performance. Rate of acceleration means nothing when you put it in HP form in my opinion. Its a given that less rotational mass would show an increase in acceleration thus on some dynos an increase in HP. But to actually say lighter wheels give you more power is a false statement.
 

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If you lighten the internals on an engine itself, does the same engine with lighter internals make more power? Anything connected to the crank that decreases load will yield higher numbers.

If you put identical engines in two different chassis weighing differently that would be a measure of acceleration between the 2 engines. But effectively changing the load on engines moving parts changes its output. Hence HP at the crank and HP at the wheel.

By reducing torque load on a engine you increase mechanical horse power.
 

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If you lighten the internals on an engine itself, does the same engine with lighter internals make more power? Anything connected to the crank that decreases load will yield higher numbers.

If you put identical engines in two different chassis weighing differently that would be a measure of acceleration between the 2 engines. But effectively changing the load on engines moving parts changes its output. Hence HP at the crank and HP at the wheel.

By reducing torque load on a engine you increase mechanical horse power.
You are absolutly correct but once again we are comparing apples and oranges. I know if I put lighter wheels on my rate of acceleration would be greater due to a decrease in load thus yes mechanical HP is increased. I do not need a dyno to tell me that. But I guess the dyno numbers do put those gains into some sort of perspective. As far as dyno numbers go I care only to know what gains were made from the engine itself and as its not very cost effective to remove an engine to place on an engine dyno my only option is a load wheel dyno. But that is my opinion.
 

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>>>Thus more work was performed. 6 more HP to the road. <<<

Not exactly. Power is not work. Work is the integral of force over distance. See, you should have paid attention in calculus class. Bet you thought that was irrelevant too!

Anyway. It's very similar in concept to making the bike lighter. Same power + lighter bike = faster acceleration. Same power + lighter wheels = faster accertation. The difference being that the wheels don't only accelerate moving forward with the rest of the bike, their rotation also accelerates. So, lighter wheels (assuming they have a lower moment of inertia) contribute to increased acceleration twice.
 
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