kzz1
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posted August 02, 2005 03:08 PM
 Edited By: kzz1 on 2 Aug 2005 16:12
Question on gearing through the 1/4 mile?
Is there a formula for gearing or is it just trial and error? All I know is you want to be at or close to redline going through the traps. I know that I fall short about 75' before the end of the 1/4 and having to shift. 17/48 with a Shinko
  
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kzz1
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posted August 02, 2005 03:27 PM
Anyone?
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matt sterbator
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posted August 02, 2005 03:37 PM
I think there more personal preference involved than any real formula. Plus it really depends on the bike and rider as a combo.
Funny, I just noticed your current gearing, 17/48. I had the same gearing and a 180/55 shinko. I'd hit the limiter at what seemed like the first cone in the traps, I'd pull the clutch in on the limiter and it'd kill ATLEAST 3mph. I liked the drive outta the whole and how it ran through the 1/8th, but it just didn't finish well in the 1/4. I did like how it could even bog and still pull a 1.49 60ft though, lol.
That's what I was running before the Grudge race then I put a supercorsa and Marschesini back on it and only had a 46t for that rim. I figured I'd try to spray for the first time but couldn't get used to the gearing so I decided to save it for another day
. I'm gonna try a 16/46 setup tomorrow night if the weather holds. Depending on how it does I may try a 16/47 like Rick.
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CrotchRocket
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posted August 02, 2005 04:08 PM
Ken, I guess you need the 17-47...That should do the trick...But, what gear are you going through the traps in???
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kzz1
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posted August 02, 2005 04:15 PM
Hmmm.... being that I don't have a 47 tooth which I would like to try, I put on a 46 stock tooth to try Friday 17/46
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kzz1
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posted August 02, 2005 04:18 PM
quote:
Ken, I guess you need the 17-47...That should do the trick...But, what gear are you going through the traps in???
Well ya know...I don't know  Everything is happening so fast that I forget that part every time I will make every effort to remember Friday
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CrotchRocket
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posted August 02, 2005 04:20 PM
Your at 60" right???...You need some stock of sprockets...
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kzz1
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posted August 02, 2005 04:30 PM
quote:
Your at 60" right???...You need some stock of sprockets...
Nope.. 64"
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CrotchRocket
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posted August 02, 2005 05:13 PM
Then your going throughredline in 4th...You need to be in 5th, you need a 49 tooth for the rear!!!...Then you will save your clutches a bit more...
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kzz1
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posted August 02, 2005 05:17 PM
quote:
Then your going throughredline in 4th...You need to be in 5th, you need a 49 tooth for the rear!!!...Then you will save your clutches a bit more...
Why a 49 tooth? Is it because of the 64 " wheelbase? I can get a hold of a 50tooth and 16 from a friend?
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CrotchRocket
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posted August 02, 2005 05:36 PM
For the summer use,
17-49 = 5 1/2 teeth up...
17-50 = 6 1/2 teeth up...
16-47 = 6 teeth up...
For cool weather use,
17-49
16-46
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entropy
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posted August 02, 2005 09:35 PM
ken,
why not just use the rpm/mph/tire circumference/sprocket size, gear calculator???
input tire circimference, front & rear sprocket size, and it will show you mph & rpm for each gear.
If you don't have the calculator i can email it to you when i get to work later this morning
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kzz1
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posted August 03, 2005 03:41 AM
quote:
ken,
why not just use the rpm/mph/tire circumference/sprocket size, gear calculator???
input tire circimference, front & rear sprocket size, and it will show you mph & rpm for each gear.
If you don't have the calculator i can email it to you when i get to work later this morning
Yeah.. Sounds great! Pm me .
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entropy
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posted August 03, 2005 06:34 AM
Ken
i just sent it to angi's email as i don't think i have yrs (do i???)
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bossman12r
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posted August 03, 2005 11:53 AM
Edited By: bossman12r on 3 Aug 2005 13:04
So if the gear calculator says that my 16/45 can do 177 in 5th at 11800 how would i tell that the speedo would be reading at that same rpm or better yet what is the speedo say at 162 trap speed with a 16/45 gearing.
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kzz1
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posted August 03, 2005 12:01 PM
quote:
Then your going throughredline in 4th...You need to be in 5th, you need a 49 tooth for the rear!!!...Then you will save your clutches a bit more...
So are you saying I need to be at the top of 5th?
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CrotchRocket
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posted August 03, 2005 08:40 PM
yes
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outsiderzx12r
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posted August 07, 2005 01:04 PM
quote:
. I'm gonna try a 16/46 setup tomorrow night if the weather holds. Depending on how it does I may try a 16/47 like Rick.
Hey Matt, how did this combo work out for you? I have the 46/16 on mine but haven't taken it to the strip yet.
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matt sterbator
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posted August 07, 2005 01:12 PM
Got to the track and was rained out, two nights in a row.
Hope to get some 1/8th mile passes this Tuesday then some 1/4 mile next Sat. I'll post up the results when/if the rain ever quits messin things up 
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OutsiderZX12R
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posted August 08, 2005 06:59 PM
Sounds good. I hope to get mine to the track in the next week or two. I know on the street I like the way it launches.
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MadMike
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posted August 09, 2005 07:52 AM
I say go 2t up in the back and you should be close to the top of 5th going through the traps....
that is what I run 17/51....
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ianred1
Novice Class
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posted October 03, 2005 09:57 AM
my weight is 230 , i have a zx10r 63 " wheel base, geared 2 down in front 4 up in rear going threw traps at almost revlimiter in 5th , at 149 miles per hour at 9.15 , 9.20's consistantly ! you must put in your weight into the equation , takes more gear to pull a heavy guy !!!!!
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