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Attention in the pits!!

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    #1

    Attention in the pits!!

    I had some headwork done on my 80 gs 1100 over the winter. 1mm oversize intakes & some porting, new seals & guides etc.
    I've been running a 18/48 sprocket combo on the street. I used the 18 to make sure I have enough clearance on the Bandit swingarm. I raced it last year & found I was shifting into 4th gear a couple of hundred feet shy of the stripe. I want to do a few drag race weekends this summer & am thinking of going to a 17/52 combo for the track.

    Thoughts? Advice?
    80 gs1100 16-v ported & polished, 1 mm oversize intake valves, 1150 carbs w/Dynojet stage 3, plus Bandit/gsxr upgrades
    Tags: None
    #2
    530?
    Curt
    sigpic'85 GS1150 1428 14-1 200+hp Hang On

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      #3
      17 divided by 52 is .326. i am pretty sure that is Ray's formula... I am running 15/48 and am in fifth before the stripe by about 150 feet... might go to 16/48...
      The reasoning is closest to .320 usuall will get you within spitting distance...
      Curt
      sigpic'85 GS1150 1428 14-1 200+hp Hang On

      Comment

        #4
        perfect, thanks.
        80 gs1100 16-v ported & polished, 1 mm oversize intake valves, 1150 carbs w/Dynojet stage 3, plus Bandit/gsxr upgrades

        Comment

          #5
          18/56 gets you .321
          18/55 gets you .327

          Comment

            #6
            Originally posted by ozman View Post
            18/56 gets you .321
            18/55 gets you .327
            ACTUALLY.....18/56 is 3.11 & 18/55 is 3.05
            Divide the rear tooth count by the front count to get the ratio. You need to be around 3.20 to get the shift light on in high gear about 100-150 feet before the finish line in a quarter mile. You will need 57 or 58 teeth on the rear with an 18 front sprocket. I run 15/48 but mine is 630.
            Ray.

            Comment

              #7
              Originally posted by nastyjones View Post
              I had some headwork done on my 80 gs 1100 over the winter. 1mm oversize intakes & some porting, new seals & guides etc.
              I've been running a 18/48 sprocket combo on the street. I used the 18 to make sure I have enough clearance on the Bandit swingarm. I raced it last year & found I was shifting into 4th gear a couple of hundred feet shy of the stripe. I want to do a few drag race weekends this summer & am thinking of going to a 17/52 combo for the track.

              Thoughts? Advice?
              no bars?
              better gear it to go through in 4 not 5..could be a handful leaving the line..

              Comment

                #8
                Originally posted by blowerbike View Post
                no bars?
                better gear it to go through in 4 not 5..could be a handful leaving the line..
                Not a problem if he has a lock up & extensions on the Bandit arm. Strapping the front will help too.
                Ray.

                Comment

                  #9
                  Nope, no bars, no lock up, no strap, just a guy looking to do a few race weekends this summer. If 17/52 takes me to redline in 4th through the traps, that would be fine.
                  80 gs1100 16-v ported & polished, 1 mm oversize intake valves, 1150 carbs w/Dynojet stage 3, plus Bandit/gsxr upgrades

                  Comment

                    #10
                    Originally posted by nastyjones View Post
                    Nope, no bars, no lock up, no strap, just a guy looking to do a few race weekends this summer. If 17/52 takes me to redline in 4th through the traps, that would be fine.
                    that's how i set up a true street bike.
                    shift light on before the traps but not hit the limiter before the stripe in 4th.

                    Comment

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