1/8th mile gear set up

[ca1badptc]

I have looked around and could not find any thing for a 1/8 mile gears set up.
We are putting my Busa motor in to a Jr Comp Dragster.
want to run 4 gears with RPM's around 9 to 10 thousand
the new roll out is 76 inches.
Thanks Ralph

 

[Mr Brown]

Weight?

 

[ca1badptc]

I will find out tomorrow.
But i think with driver 400-450
Thanks

 

[ca1badptc]

I was wrong 525 lbs + driver my driver 120lbs
Thanks Ralph

 

[Mr Brown]

16/45 would be my guess. I'm about 750 lbs and shift into 4th right before the traps. 16/44 is my set up.

 

[dragonbusa]

160hp on a jr?

 

[ca1badptc]

Yes on a JR comp Dragster.
My son Turns 15 in march.
The Jr Comp's can run 6.90 in the 1/8th.
And then i can turn around and run it in the 1/4.

 

[tmpowdercoating]

i run 15-42 puts me through in the top of 4th

 

[ca1badptc]

Thanks to all.
Ralph

 

[GoldenChild]

i run 15-42 puts me through in the top of 4th

I would get rid of the 15 tooth and go to 45 rear to cut out the pin pinching..how often do you replace chain or sprockets?

16-45

 

[tmpowdercoating]

i get alot of crap on the 15. ive been running it for 2 years and have never had a problem. it works good for me and im sticking with it.

 

[NIGHTFLIGHT]

One down 4 up 16- 44 what i run

 

[S-R Racing]

One down 4 up 16- 44 what i run

+1

 

[dragonbusa]

i get alot of crap on the 15. ive been running it for 2 years and have never had a problem. it works good for me and im sticking with it.

I"ve got a 15 on the shelf I"ve been wanting to try,I"m glad you said that, i think i will. As for the gearing on the jr dragster, theres no way you can go by what the bikes are running. the tires on that jr aint even close to the same diameter as the bikes

 

[Mr Brown]

Jr Comp is different than Jr Dragster.

 

[dragonbusa]

Jr Comp is different than Jr Dragster.

my bad,missed the comp part. But still if the tires aint the same diameter as the bikes theres no comparo

 

[Mr Brown]

Agreed dragon, but the tires are gonna be a lot closer than jr dragster tires, and it's a place to start.

 

[ca1badptc]

the roll outs on both bike tire and the new tire for the Jr.comp are within 1 inch of each other.

 

[dragonbusa]

the roll outs on both bike tire and the new tire for the Jr.comp are within 1 inch of each other.

shows ya what i know about jr comp that being the case, theres alot of stock sprockets laying around that could be had for small coin,and would be the cheap way to get a base line

 

[NIGHTFLIGHT]

THey run juniors Evansville fairly big program normaly 12--20 @ race.
when we were running 2 bike classes there was a couple J.D. faster than a couple street bikes.Most there dads race +they tune the beejeebes out of those carbs.

I think 7.90 is fast there allowed because most are under 16.
They dont have busa motors least these dont.