I have a stock 2004 Kawasaki 636 Zx-6r and after 3years or riding it, it just doesn't feel the same as far as power compared to when I first got it. Can't really afford to get a liter bike right now so I was curious if I upgraded to a slip on exhaust and power commander, How much of a difference will I notice over stock? Is it really worth the money? I know a full exhaust is better but I can't spend that much. Thanks guys

 

it won't make much of a difference in power, but the PC will smooth out the powerband.

 

You're not gonna put them on and then go "oh my god, it's like a completely different bike. That power is insane!"
Most likely you might notice a slightly better pull after 10k, maybe an improved midrange, but that's it.

If you really want to notice a performance gain, get a different sprocket setup. It's cheap, and easy to change back if you decide you don't like it.

 

+1 on sprockets.. its really the only way to get that power feeling

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bad-monkey &raquo;</TD></TR><TR><TD CLASS="quote">it won't make much of a difference in power, but the PC will smooth out the powerband.

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Yep even with out a slip on. Just get a good map.


Modified by backlash at 7:40 AM 4/12/2007

 

Well, it won't be a literbike, if that's what you're expecting...

 

it will sound better (exhaust) and u won't backfire as much (pc)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rdblckSV650S &raquo;</TD></TR><TR><TD CLASS="quote">
If you really want to notice a performance gain, get a different sprocket setup. It's cheap, and easy to change back if you decide you don't like it.</TD></TR></TABLE>

this sprocket changing you speak of, wouldn't that shorten/enlongate the gearing?

my friend used to complain about not being able to do a wheelie on his 02 gsxr600, and said he needed a "new sprocket for more torque." I did not know anything about motorcycles at this time, wtf was he talking about?

 

think of a bicycle.
If you go to a smaller sprocket up front you've effectively shortened your final drive gear ratio which will put you at a higher RPM for any given speed. You will also rip through each gear faster. This gives you the sensation of torque.
If you go to a larger sprocket in the rear the same effect is felt.
But the general rule of thumb is the -1 teeth in the front is equal to +3 teeth in the rear. I just did +2 in the rear on my SV650 and i love it. It's snappy but not too short of gearing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ap &raquo;</TD></TR><TR><TD CLASS="quote">

this sprocket changing you speak of, wouldn't that shorten/enlongate the gearing?

my friend used to complain about not being able to do a wheelie on his 02 gsxr600, and said he needed a "new sprocket for more torque." I did not know anything about motorcycles at this time, wtf was he talking about?</TD></TR></TABLE>

it's like on a mountain bike... the smaller the front sprocket and the bigger the rear, the easier it is to pedal (less rotations of the tire per crank of the pedals)... whereas when you put it on the big front and the smaller rear, the harder it is to pedal, but the faster you're able to go. it's a matter of ratios, how many turns of each in relation to the other.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rdblckSV650S &raquo;</TD></TR><TR><TD CLASS="quote">It's snappy but not too short of gearing.</TD></TR></TABLE>

i am concerned because my 250 only tops at like, 95 anyway.

good to know though

 

doesnt his kawi have 15t and 520 cahin stock? all youd need to do is go up 1 or 2 teeth in the rear

 

take it from a guy who just recently did +2 on his 03 zx6r...the bike is a MONSTER on the freeway now...you'll be doing about 5700rpm at 65 indicated. powerups in first are easy as pie, and overall you'll feel a big difference.
I installed a powercommander 3 last summer and i instantly noticed a improvment in the smoothness of the powerband and some top and midrange as well. It put the o-****!@ factor back in the bike...i did a k+n as well w/ a yosh rs-3 slip-on.
I'm running the two-brothers slip-on map from the pc3 website and it has stopped the backfiring for the most part, but ideally you'll want to get it dynotuned.
if you've got a slip...buy a pc3, then do a filter...but before all that good stuff, change your rear sprocket. I don't recommend changing the front any smaller than 15t, that's just more stress on the tranny and the chain.

 

o here's an address to the kit I used.

http://cgi.ebay.com/ebaymotors...WD10V

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by backlash &raquo;</TD></TR><TR><TD CLASS="quote">
Yep even with out a slip on. Just get a good map.


Modified by backlash at 7:40 AM 4/12/2007</TD></TR></TABLE>

right now im just running it with a PC and ive noticed a slight increase in power but its a lot more responsive. I also remapped it with E10 which gave another (noticeable) increase in power. if you look around you can get them for pretty cheep i got mine NEW on ebay for $220 shipped

 

might as well get a full system thats where you will notice gains compared to a slip on and if you don't want to get a liter

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rdblckSV650S &raquo;</TD></TR><TR><TD CLASS="quote">think of a bicycle.
If you go to a smaller sprocket up front you've effectively shortened your final drive gear ratio which will put you at a higher RPM for any given speed. You will also rip through each gear faster. This gives you the sensation of torque.
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I just wanted to add that changing gearing doesnt just give the sensation of torque, it actually does change the torque available, since gears are used to multiply the torque of an engine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tharptroy &raquo;</TD></TR><TR><TD CLASS="quote">

I just wanted to add that changing gearing doesnt just give the sensation of torque, it actually does change the torque available, since gears are used to multiply the torque of an engine.</TD></TR></TABLE>

it will not make a dyno read higher torque. It just changes the final drive. If you were to shorten the final drive ratio of a car it would make it faster, but it does not make it faster.
The size of tires will have this effect as well. You can buy little baby wheels and tires for your integra and it will shorten the gears up significantly. Or you can run bigger tires and it will lengthen the final drive. These do not effect hp and tq readouts, just how they're put to the ground.

 

thanks guys! looks like I'll be changing sprocket soon

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.Chow &raquo;</TD></TR><TR><TD CLASS="quote">o here's an address to the kit I used.

http://cgi.ebay.com/ebaymotors...WD10V</TD></TR></TABLE>

thanks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rdblckSV650S &raquo;</TD></TR><TR><TD CLASS="quote"> If you were to shorten the final drive ratio of a car it would make it faster, but it does not make it faster.</TD></TR></TABLE>
Eh? I didnt quite get that part.


Im guessing that your engine makes 48 lb-ft of torque (peak). lets say that 1st gear has a 4:1 ratio, and the sprocket has a 3:1 ratio

that means the peak available torque in 1st gear is 576 lb-ft at the wheel. you change your rear sprockets to 3.3:1 and the torque available becomes 633.6 lb-ft (peak).

you're right, the torque of the engine doesnt change, but the torque available on the rear wheel does change with different gears.

and of course the force that the wheel exerts onto the pavement will decrease with distance from the centerline of the wheel, its just leverage.