Low RPM Power

jmickle11 · Jul 18, 2003

I've posted this on another board. Let me know if anyone has any ideas. I'm just not convinced that nothing is wrong with it.
http://www.sportbikes.net/forums/showthread.php?s=&threadid=128609
I've got an '03 ZX6R with 850 miles on it. I've noticed that it's a little flat up to 5000 RPM. Once It revs up to around 5500-7000 RPM it's like a rocket. I took it to my dealer and they couldn't find anything wrong with it. Maybe I'm getting used to it and just need to adjust the way I ride it and rev the engine more when I take off. Should I be worried about anything?

arturo3rd · Jul 18, 2003

thats normal...power band is around 6500rpm and 8000rpm

mvrk1 · Jul 18, 2003

That's what 600's do. That's why the redline is so high.

mvrk1 · Jul 18, 2003

dropping a tooth on my front sprocket brought my power band down so that it starts at lower rpms. [}

]

dj dunzie · Jul 18, 2003

Your "powerband" guys is your entire rpm range. There is no such thing as a "powerband" that kicks in at a certain rpm. It is a description of the power produced at EVERY rpm range from idle to peak. The graph a dyno prints out a VISUAL of your entire powerband.

Also, changing gearing doesn't alter where your bike makes power in the rev range, it changes how the power is translated to the rear wheel. It might FEEL like your engine is more potent earlier on, but truthfully it's still the same... powerband.

Just a l'il pet peeve of mine... and I knew what you were trying to say...

Cheers.

bladecutter · Jul 18, 2003

He meant the front camshaft sprocket

Yeah, altering the final drive ratio doesn't adjust the bowerband, it adjusts the vehicle speed that the powerband is most noticable at.

BC.

GreenEnvy · Jul 18, 2003

Comeon DJ, dont ruin their fun

The powerband obviously would be the entire range your bike makes power, but most people refer to it as the area where the bike makes its most significant power, ie: 8000-14000 rpm's,

-gary · Jul 18, 2003

Welcome to the world of 600s. You have to rev the tits off 'em to get them to go.

jmickle11 · Jul 18, 2003

Originally posted by -gary

Welcome to the world of 600s. You have to rev the tits off 'em to get them to go.

Well, I was just a little concerned that something was wrong. It seemed to have a little more low end in cooler weather. I'm starting to keeps the revs up more and it's made a big difference to the fun factor!

Andy_7676 · Jul 18, 2003

"You have to rev the tits off 'em to get them to go"

never heard it put that way before....

-gary · Jul 18, 2003

These things do seem to be affected quit a bit by air temp. I notice a huge increase with a 20 or even a 10 degree drop. Much more so than a car.

jmickle11 · Jul 18, 2003

I really appreciate the help I've gotten on this board. Hopefully I'll be able to offer advice someday! Thanks!

" "You have to rev the tits off 'em to get them to go"

never heard it put that way before...."
I've never heard that before either...but you gotta like it!!!

arturo3rd · Jul 18, 2003

"most people refer to it as the area where the bike makes its most significant power, ie: 8000-14000 rpm's," -cdn

lets call it band of power then

Marine · Jul 19, 2003

Wouldn't getting a good full exhaust and then rejetted help increase power? I've seen some dynos really impress me with a significant bwp increase, however I've seen other dynos that wouldn't seem that it would be a good investment to ever get a full exhaust system.

I understand the whole powerband debate here. If you have a 600 engine your powerband is going to stay the same for the most part no matter what you do.

FMAN_DTF · Jul 19, 2003

its amazing how much the bike PULLS once you do get the rpms up...purely ludicris!!!

GreenEnvy · Jul 20, 2003

Marine, A full system typically will give more top end power, but most actually give you less in the power part of the rev range, since you dont use the power down there much.

dj dunzie · Jul 22, 2003

Yeah, CDN is bang on...

Most aftermarket exhaust (full system) manufacturers openly admit that in order to get the most top end peak power gains, they have to design a pipe that sacrifices SOME very low-end power, where racers never need to be anyway. We're talking 5,000 rpm and under generally, but yeah, that sounds like the range this fella was interested in boosting...

jmickle11 · Jul 22, 2003

I went for a ride on Saturday and the bike ran great. The air temp was about 83 with very low humidity. I think that higher humidity impacts this more on my bike. Which forgive my stupidity, but I thought that the fuel injection would not be as sensitive to this. At least now I know that there's nothing wrong with the bike.

swjohnsey · Jul 22, 2003

Most bike fuel injection (including the ZX-6R) is open loop. The fuel delivery is not altered for differences in altitude or atmospheric conditions.

-gary · Jul 22, 2003

I thought that was closed loop. Meaning, unaffected by outside variables?

Low RPM Power

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