twista
Zone Head
" Get up, and Stay up ! "
Posts: 797
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posted April 30, 2008 01:05 PM
DONT GET MAD,, BUT..
i have a question,, my little brother has a 06 SE white Busa,, and jsut put some slip ons on,, he would like to have a little more fun on it so he wants to change the sprocket (either front or rear),, he rides on the street only,, does anyone know what the gearing is and can anyone who has had experience with one recommend a good street setup to make it more fun to ride.. i tried a 17 up front on the 12 and it was too much low end for my taste,, so i went with a 17/45 and it is just the way i want it.. i figured we would change the front but i am open to opinion,, thanx guys and dont shoot the messenger! LOL
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lgm118icbm
Novice Class
Posts: 48
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posted April 30, 2008 01:19 PM
After seeing many discussions like this, best thing I can do is tell him to experiment. Things like this are so up to individual preferences, what might be perfect for you might be different for someone else.
My guess would be to start with +2 in the rear which should be doable with the stock chain and head from there. And be sure to remind him that his speedo and odometer will read artificially high unless he installs a speedohealer.
Then if thats not enough for him, he can try a -1 on the front with the +2 in back. That way if its too much for him, he can just put the stock rear on and that should be in the middle. Keeping in mind, I have no idea what stock gearing on a busa is, that should get him in the ball park.
Luckily sprockets aren't that expensive and you can usually sell the ones you don't end up using to somebody else that is experimenting with gearing just like your bro.
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twista
Zone Head
" Get up, and Stay up ! "
Posts: 797
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posted April 30, 2008 01:55 PM
Yea,, i had a ratio calcuator but i lost it when my laptop went on the frits,, stock for us is 2.56 then i tried a 2.71,, which is one down in front,, and i am at 17/45 which is 2.65 now and i love this setup,, anyone have a link to a final drive calculator,, just wnat to be able to punch in the sprockets and get a ratio,, no speed and all the other stuff,, just a ratio..
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" When in Doubt, There is no Doubt !"
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zrexpilot
Expert Class
Posts: 470
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posted April 30, 2008 02:27 PM
to get the ratio just devide the rear by the front. 45 devided by 17 is 2.647.
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted April 30, 2008 02:41 PM
Don't need no stinkin calculator.......
You can make a little chart -Primaries down the side 16,17,18
Drive sprockets across the top 43,44,45,46,47
Do the division like zrex said and fill in the boxes. Comes in very handy.
You'll also find out which combinations are nearly identical-----
17/45= 2.65
18/47=2.61
Let's say you had all those combos and liked the idea of a 2.6-ish
Which pair would YOU choose?
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twista
Zone Head
" Get up, and Stay up ! "
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posted April 30, 2008 02:59 PM
what would a 17/43 be? i like my setup 2.65,, this is for my brother though,,
stock he is at a 2.35,, im thinking he would like a 2.44--2.47ish what sprocket would achieve that?
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" When in Doubt, There is no Doubt !"
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Texas12R
Zone Head
Posts: 545
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posted April 30, 2008 04:39 PM
I think the 18 would be better for less loss thru the chain, because of the larger radius.
but Im not know as one of the shaper knives in the drawer.....in fact Im more like the blunt end of a stick 
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NOX
Needs a job
PMRA / TMRC Super Street 4022
Posts: 3745
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posted April 30, 2008 06:20 PM
depends, on the street, I would choose the big sprockets, on the strip, the lighter smaller ones.........
That is, if I was not running a ton of hp.
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KZScott
Needs a life
high on speed
Posts: 7235
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posted May 01, 2008 02:36 PM
i think its a toss up. its harder to turn a chain around a tighter diameter, but easier to turn smaller sprockets and less chain links... so whats really the best way DM?
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted May 02, 2008 07:40 AM
Bigger sprockets consume less hp. The portion of the chain that is ON the sprocket at any point doesn't "cost" anything because there is no movement. It's the flex coming on and off that creates friction. Could it be balanced by the sprocket weight? Who knows..... But then I usually think in terms of top speed rather than ET and for top speed the weight doesn't matter.
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NOX
Needs a job
PMRA / TMRC Super Street 4022
Posts: 3745
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posted May 02, 2008 01:33 PM
That is also why Jr. Dragsters and go cart racers buy sprockets with every other tooth missing......
we are talking 80 plus tooth sprockets here........., it would be the size of our rear wheels.....lol
____________
42 Wins
21 Runner-ups
2010 TMRC Super Street Points Champion
2010 PMRA Super Street #3 Points
2009 PMRA Super Street Points Runner-Up
6 Time Centerville Dragway Points Champion
Sponsored by:
Scorpion Helmets
Galfer Braking
AMSOIL
Steve's Speed Shop
Kawasaki Sports Center
Mickey Thompson Tires
Catalyst Racing Composites
Conway Cycle
Syed Leathers
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