Learning2race
Expert Class
Posts: 138
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posted May 16, 2009 10:08 AM
calling out gearing gurus
I've been making 9.8-9.9 second passes fairly consistantly now, but I think I could benefit from a gear change. I'm currently at 16-44. If I shift at 10,500RPM at each gear change, my 4-5 shift occurs roughly at the 1000' mark and I "coast" through to the end in the lower end RPM of 5th gear. I'd like to cross the line right at a 10500 shift point for maximum gain of the gear.
What tooth count would I need to increase the rear to? I was going to just guess and pick up a 47, but thought I'd use the wealth of knowledge on here first - thanks in advance
  
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14nooby
Zone Head
Posts: 987
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posted May 16, 2009 10:11 AM
Depends on you weight? I run 16/41 and I am at the top of 5th when I cross the line. I weigh 150.
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pazx14rider
Zone Head
Posts: 953
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posted May 16, 2009 10:26 AM
and what is your set up? stock wheelbase? I think shifting at 10500 is too soon too.
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dubious
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Needs more time to ride!
Posts: 8442
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posted May 16, 2009 11:01 AM
 Edited By: dubious on 16 May 2009 19:29
how is your 60 foot, what wheelbase? Weight? Pipe? mods? lowered?
I ask because I don't know of anyone running that 16/44 gearing already, and going 47 is even further out there
Most 220 lb+ heavy guys are very staisfied with 16-42, or 43.
I am not trying to be an ass, just trying to help, but there might be better ways to get the ET down, then the gear you have will be closer, and 47 would be counterproductive
gearing that low has got to be a handful to launch, wheelies etc, and your shift from 1st to second would be almost instantaneous once the clutch is out off the line...
These engines don't rev as fast as literbike, they like to pull, meaning close to stock gearing is often better than low gearing, it might feel faster with ultra low gears, but I doubt it is
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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Learning2race
Expert Class
Posts: 138
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posted May 16, 2009 11:02 AM
Didn't think wheelbase would factor in - gear ratio is gear ratio isn't it? (I'm not a mechanic - I just like to ride!)
Anyway, 64" at around 240 suite
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pazx14rider
Zone Head
Posts: 953
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posted May 16, 2009 11:10 AM
quote:
Didn't think wheelbase would factor in - gear ratio is gear ratio isn't it? (I'm not a mechanic - I just like to ride!)
Anyway, 64" at around 240 suite
Gear ratio calculates to power out of the hole...short wheelbase you dont want alot of hear or all it will do is wheelie. If the bike is extended then you can add more gear because the bikes longer and can get more power to the ground.
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pazx14rider
Zone Head
Posts: 953
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posted May 16, 2009 11:13 AM
quote:
how is your 60 foot, what wheelbase? Weight? Pipe? mods? lowered?
I ask because I don't know of anyone running that 16/44 gearing already, and going 47 is even further out there
I am not trying to be an ass, just trying to help, but there might be better ways to get the ET down, then the gear you have will be closer, and 47 would be counterproductive
gearing that low has got to be a handful to launch, wheelies etc, and your shift from 1st to second would be almost instantaneous once the clutch is out off the line...
+1 a 47 tooth would be more for a wheeliebar appication
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Wheelie
Needs a life
Old Man
Posts: 6902
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posted May 16, 2009 11:16 AM
quote:
I've been making 9.8-9.9 second passes fairly consistantly now, but I think I could benefit from a gear change. I'm currently at 16-44. If I shift at 10,500RPM at each gear change, my 4-5 shift occurs roughly at the 1000' mark and I "coast" through to the end in the lower end RPM of 5th gear. I'd like to cross the line right at a 10500 shift point for maximum gain of the gear.
What tooth count would I need to increase the rear to? I was going to just guess and pick up a 47, but thought I'd use the wealth of knowledge on here first - thanks in advance
dont believe everything you here.
wee
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Wheelie
Needs a life
Old Man
Posts: 6902
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posted May 16, 2009 11:19 AM
Edited By: Wheelie on 16 May 2009 19:21
I didnt really care to post this video, but to everyone thats says 16-48 will not work, thats what im running. leaving at 7000 rpm.
wee
1100rr.com/Monster5.88.wmv
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Wheelie
Needs a life
Old Man
Posts: 6902
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posted May 16, 2009 11:20 AM
Edited By: Wheelie on 16 May 2009 19:20
edit
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dubious
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Needs more time to ride!
Posts: 8442
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posted May 16, 2009 11:33 AM
Hmmm,
I would have never thought.... , and it is the first I have heard...
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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Wheelie
Needs a life
Old Man
Posts: 6902
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posted May 16, 2009 11:34 AM
quote:
Hmmm,
I would have never thought.... , and it is the first I have heard...
try and keep it a secret! lol
wee
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14nooby
Zone Head
Posts: 987
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posted May 16, 2009 04:35 PM
Wheelie,
What are your short times and your ets? If you throw in an extra shift there goes .20 off your et.
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Wheelie
Needs a life
Old Man
Posts: 6902
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posted May 16, 2009 04:59 PM
quote:
Wheelie,
What are your short times and your ets? If you throw in an extra shift there goes .20 off your et.
so if I change my gearing I can run 5.68?
wee
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