Sprocket Ratios on Turbo Bikes

[GSX1300R-T]

Hey Guys,.........facts and experienced answers only PLEASE!! Talking with a friend from the ORG,......he stated to add 1 tooth to the front to my currently stock(17/40) sprocket setup. I realize this will make the bike a little less wheelie prone and help "load" the turbo quicker. Would switching to the Gen 2 setup (18/43) work against me or make the bike that much quicker?? Thanks for the input!!

 

[RYC1966]

prior to the turbo I had a -1 in front and +2 in back...after turbo I rode it stock front and +2 in rear...now I have +1 in front and +2 in rear and I like it the best. I ran out of first gear quick and then quicker with the turbo. I went with the +1 in front based on guys advice from here and it is what I would reccomend. I am a inexperienced racer...some guys may manage the throttle better and the stock or -1 up front is best for them.

 

[Commuta_Busa]

I guess it depends what you're trying to do. For basic street turbo duty 18/40 is common for a gen1 and 19/43 for gen2. The "+1" in the front just makes things a little more manageable. Boost psi also can be a factor and CR. Low compression off boost feels sluggish with the +1 setup until you start building boost. Some like it that way some don't.

 

[BATTMAN]

I went 2 up in the front and 4 up in the rear. 19/44 on a gen 1.

 

[ktw88q]

17-45

 

[PaulCav]

I run 17/40 and race the bike nearly every week. It is manageable although I am only 4" over with 247 hp at 6 lbs. The front wants to carry quite a ways out.

I had 17/43 and could not keep the front down at all.

 

[Rick D]

17/40 but thinking about switching to an 18 because of wheel spin. I have a 6'' stretch and I'm a 135 pounds. What should I do anybody please chime in

 

[mysql]

I went 2 up in the front and 4 up in the rear. 19/44 on a gen 1.

that's -1.5% change from stock.. hardly seems worth it.

3 mph faster in 6th at 10,000 rpm.

 

[Rick D]

Mysql you are talking about the 18/40 set up right???

 

[mysql]

no. 18/40 is about -5%

use this great website: http://www.gearingcommander.com/

 

[Rick D]

I know they say with a turbo set up you would gear up instead of down. Me being used to asperated stuff its just hard to go higher than stock gearing.

 

[GSX1300R-T]

Well,..........after a little more thinking about this,........I sent my new 40T Driven rear sprocket back in exchange of a 43T. 18/43 will be my ratio. Worse case,........I'll relearn to ride it!! Heck........after a couple of months of not riding,........I have to relearn to ride it anyway!!!

 

[PaulCav]

Rick,

When the boost kicks in the higher gearing does not seem like enough. Admittedly, I am not aggressive as I am an ET racer and try to be as consistent as possible. My bike is easily capable of 8.70's with a rider like Jeremy Teasley on it, yet I run 9.20's all day long leaving the line at 5500 rpms with 1.51 60'. I can tell you with 17/40 gearing my front wheel carries 3 inches off the ground through 2nd gear on a good pass.

When I first installed the turbo 3 years ago, I kept the 16/43 set up I had when running without the turbo. For my riding style there was no way I could keep the front end down regardless of what rpm I left at.

Everyone is different, their goals as to what they want to run dicatates the riding style and consequently their gearing. Find what is comfortable for you.

 

[BATTMAN]

that's -1.5% change from stock.. hardly seems worth it.

3 mph faster in 6th at 10,000 rpm.

With a turbo, you have to gear up. Ive been told that it puts more of a load on the turbo.....which is what the turbo likes. Ive also been told that the bigger front sprocket gives you a little more torque. I dont know if it is true or not. The bike is easier to handle with a 19 front sprocket at 20-25lbs of boost. Ask the pros what front sprocket they run. You'll be suprised by some of their answers.

 

[BUSA GHOSTRIDER]

Ok, this seems to be all over the place. What, in your opinion, would be a good setup for a turbo bike NOT on the drag track. I plan on mine being a daily driver and would like a good setup that doesn't put me in the air every time I take off.

 

[nitrousjunkie]

I liked my 19/44 and 19/46

 

[BATTMAN]

19/42 for the street

 

[Rick D]

I'm going to keep the 17/40 for now and when I get the 2-step I'll try the 19/40 or 19/43. I do a lot of street riding/racing.

 

[BUSA GHOSTRIDER]

19/42 for the street

So I take it from the post above that my stock gearing on my 07 should be 16/43?

If this is correct do I really need to purchase a new rear sprocket just to go down 1 tooth?

One more question: Will I have problems fitting my stock chain back when going up 3 teeth on the front sprocket?

Thanks for your input BATTMAM!!

 

[Rick D]

17/40 is stock gearing for 1999-07