Ive heard this and Ive heard that but what are MOST of the '05 636s dynoing at? They are rated at 110hp to the motor if Im correct? Allthough, like ive said, Ive heard the rwhp being in the 120s.....?

Haven't dyno'd mine but I've read reports of 118-120 or so rear wheel on other forums. I think that was with light mods though... pipe, PCIII, etc...

Ive got a -1 +2 sprockets on mine so it will be interesting to know how much power those robbed me of...

Ya most dyno's i've seen had @ least new pipes & dyno'd about 120hp. Very impressive.

Ive got a -1 +2 sprockets on mine so it will be interesting to know how much power those robbed me of... Sprockets dont have anything to do with power or power loss. Well, unless you put a significantly heavier sprocket on, then perhaps you might lose a pony or two to the wheel...

full system, VP U4, custom mapping + head gasket should get 130+. I'm already feeding my 636 a steady diet of cash so I think I'll just see how much power I can get out of her.

Sprockets dont have anything to do with power or power loss. Well, unless you put a significantly heavier sprocket on, then perhaps you might lose a pony or two to the wheel... Thats interesting. Now, correct me if Im wrong as Im new to bikes and from the car world but if you put gears in a car then have it dynoed, the gears will rob you of about 20rwhp. Im under the assuption that sprockets (same as gears) will do the same just on a smaller scale. You basically lose hp but gain tq. Going to a higher gear ratio (+1,+2,+3,ect) will increase Tq but hurt your topend speed, therefore hurt your overall HP. Why is this not the same on a bike? example-- Stock bike dyno 120rwhp 95rwtq Same bike with a +3 rear sprocket dyno-- 115rwhp 100rwtq This is what would happen to a car with gears so why does that not apply to a bike with sprockets? Im here to learn, thanks guys.

Rumor has it that the new GSXR 600's are supposed to have 130hp. We'll see how that turns out when they are released. The new 750 is rumored to have 150hp. I know... I know... rumors don't mean anything.

That's to the crank... not the wheel. There's no way Suzuki would add 30rwhp on the 600 and 750 out of the blue over last year's models. Like always, the rumor mill always churns out CRANK horsepower... with ram air most likely worked into the equation. Remember the 04 R1 claiming 180hp? Then we find out it's 180 hp to the crank w/ram air... which translates into 150rwhp on the dyno. Might as well talk about the ZX12R's 191 hp (crank w/ram air)

the equation for measuring h.p has nothing to do with the gear ratio's. It will make power quicker or accelerate faster or slower, but the H.P will be the SAME. Same with a car. Same as if you do a run in 2nd gear or 6th gear. If you measure the run vs speed? Yeah for sure. It'll show more h,p through the curve but not overall h.p, or peak number. As for h.p numbers, you cannot possibly say, as each dyno will give you a different reading. My dyno has the 05 ZX6 at 106h.p. and 111h.p with a slip on. Dyno down the road will say about 120h.p although the bike is putting out exactly the same h.p at the wheel on both dyno's. So you can see how it's just silly to say "the 06ZX or 06GSXR outs out Xh.p" coz it will, on THAT dyno. Not on another. Dyno figures are only useful for the comparison of mods before and after etc.

Um... depends on the type of dyno. Inertial dynos can be inaccurate for lots of reasons. Changing gearing will affect the rate the drum is accelerated, which will change the HP reading (and torque when it's back-calculated). Just use a dyno for comparisons between one setup on your bike and the next, and try to do both runs under the same conditions - and if you're on an inertial dyno, use the same back tire wtih the same air pressure.

You're right except for the gearing changing h.p. It doesn't. I can do a run in 2nd and a run in 5th, the h.p will be exactly the same. It'll make power more quickly, for sure, but measured over rpm? SAME.

You're right except for the gearing changing h.p. It doesn't. I can do a run in 2nd and a run in 5th, the h.p will be exactly the same. It'll make power more quickly, for sure, but measured over rpm? SAME. I think he means the gearing as in sprockets, not what gear the trany is in. Thats what I was talking about as well.

I think he means the gearing as in sprockets, not what gear the trany is in. Thats what I was talking about as well. Doesn't matter... The gears in the tranny are simply different ratio cogs. If the dyno reads second and fifth gear runs the same as far as hp at any given RPM it would also read the same before and after a sprocket change. If one type of ratio change doesn't affect it then it only makes sense that the other way wouldn't either. :wink:

Exactly. They are one in the same. Only difference, is the sprockets are fixed, the gears you can change to alter the ratio for obvious reasons.

Ok. Then can you explain to me why when you dyno a stock car at 300rwhp but put 4.11 gears in the rear end then dyno again the rwhp is then 280rwhp? Im not saying that the actual HP output has dropped but the dyno reads it like it has. So are you saying that a sock bike does 115rwhp then with sprockets its still going to dyno 115rwhp?

Ok. Then can you explain to me why when you dyno a stock car at 300rwhp but put 4.11 gears in the rear end then dyno again the rwhp is then 280rwhp? Im not saying that the actual HP output has dropped but the dyno reads it like it has. So are you saying that a sock bike does 115rwhp then with sprockets its still going to dyno 115rwhp? exactly :1848: BD

exactly :1848: BDwhat Im asking is, why is a bike different than a car? (besides the obvious, fockers!!)

Think about what gearing and tranny ratios mean. Different gears are just ways of multiplying torque. Torque from the flywheel would be the same after changing sprockets/ratios, torque to the rear wheel would change throwing off HP #'s since torque and HP always cross on the graph at 5250 rpm. So deeper gearing (lower) doesn't increase engine torque but only multiplies what is there and results in greater driving force...

I'm gonna have to go and do this on the dyno aren't I? and then post it up here so you can see. Measured over speed? the number will be the same but the bike will show more h.p over the same speed all the way through, coz it's accelerating quicker, BUT over rpm, it'll be the same. Dan Kyle actually has it somewhere on his website as something to look out for with dyno runs showing it over speed and saying you have more h.p through the midrange etc, coz they just did the run in a lower gear, but he peak number was still the same. I'll see if I can find it.

I am agreeing with you birdman. More driving force, greater acceleration yes! More HP with a sprocket change no...HP will be the same on an engine for any rpm regardless of how much more gearing you have. If the above weren't true then dyno operators and magazine comparisons would specify overall gearing with each dyno run's results...

yeah. That's it. Sorry, wasn;'t arguing with you, was just saying in general, coz no matter what we SAY some of the guys will be thinkin "nah, it can't be right". Haha Which is fine, just coz we say it, doesn't mean it's true, so I'll dyno a bike today label them in which gear they were done in and post the results showing over speed and at rpm so we can all see it for ourselves. Hope this helps.

I get what you guys are saying now. I just come from the car world thats all....and I guess the way its always been done on a car dyno is that the numbers are never corrected (I think). Smileyman: I wasnt expecting to gain hp, in fact I was prepared to lose some b/c of my sprocket change. Not that Id actually "lose" hp, just that the dyno would read that I had. At least thats what happens on a car so I just applied that to a bike, I see what you guys are saying now. Thanks!

The same applies, car or bike. Same thing. It will not lose h.p. Just take longer to make it. Have a good one.