Quick quiestion on gearing for nitrous.

[Moparict]

I have a stock 07 Busa for the most part. Short stacks with airbox mod. Stock exhaust and a 4" over cheater arm. Shinko 003 Ultra on the rear. Currently, I'm 16/40 and have ran 10.18 @ 139 on the motor with a 1.65 60ft. I want to put on an additional 40hp with nitrous and have been wondering if I need to re-gear the bike. Thanks in advance.

 

[Over_Easy]

I think most run a 16/42...some experts will be along with professional advice.

 

[Moparict]

:<span style='font-family:arial'><span style='font-size:13pt;line-height:100%'><span style='color:red'>CRICKETS:</span></span></span>

 

[johnnycrash]

Are you running an air shifter? Low gearing + nitrous = some seriously fast shifting. I'm 17/44 with a 50 shot and a Cycle-Tek airshifter - when I'm not spraying I wish I was geared even lower, when I am spraying I wish I was geared higher as I'm tapped in 6th in what seems like an instant.

Sorry if that's not much help - I say just throw the nitrous on it as-is and see how it feels.

 

[dadofthree]

(johnnycrash @ Sep. 01 2007,02:24) Are you running an air shifter? Low gearing + nitrous = some seriously fast shifting. I'm 17/44 with a 50 shot and a Cycle-Tek airshifter - when I'm not spraying I wish I was geared even lower, when I am spraying I wish I was geared higher as I'm tapped in 6th in what seems like an instant.

Sorry if that's not much help - I say just throw the nitrous on it as-is and see how it feels.

In theory at 10,200 RPM in 6th you'd be running 172 MPH

 

[GPW]

(dadofthree @ Sep. 01 2007,01:20)

(johnnycrash @ Sep. 01 2007,02:24) Are you running an air shifter?  Low gearing + nitrous = some seriously fast shifting.  I'm 17/44 with a 50 shot and a Cycle-Tek airshifter - when I'm not spraying I wish I was geared even lower, when I am spraying I wish I was geared higher as I'm tapped in 6th in what seems like an instant.

Sorry if that's not much help - I say just throw the nitrous on it as-is and see how it feels.

In theory at 10,200 RPM in 6th you'd be running 172 MPH  

Rider weight and cutting through the air changes that formula a tad, with a 40 shot you might just have to drop one tooth on the rear to keep off the limiter...having three sprockets on a "test and tune" night does the trick.

 

[Moparict]

I am 210 without my gear. I do have an airshifter with an auto box. I will probably get a few sprockets, I just wanted to get in the ball park first instead of walking around in the parking lot. Thanks for the help ya'll.

 

[SLEEPERBUSA]

The quicker that you can come on the button, the better for ET.
If it wheelies too bad in first, you could knock a couple of teeth OFF of the rear to calm it down.
It'll feel slower on the motor, but if you can grab the button sooner, you'll prolly go quicker.

 

[BATTMAN]

What gear are you going to hit the NOS in? I would start off with the gear you have...16/40. With a 40 shot, it's going to come up in 3rd with the gearing you have now.