Results 1 to 7 of 7

Thread: GS1150 drag-racing baseline gearing recommendations

  1. #1
    Join Date
    Dec 2019
    Location
    Portland, Oregon
    Posts
    86

    Default GS1150 drag-racing baseline gearing recommendations

    Looking for baseline / starting-point gearing recommendations - any suggestions?

    Bike is an '85 GS1150, I believe internal primary drive and transmission ratios are stock. Looking to get recommendations for both 1/8-mile and 1/4-mile setup.

    I know I'll need a giant pile of sprockets eventually ... just looking for some good starting points for both track-length setups.

    Any suggestions appreciated!

    Thanks, Patrick

  2. #2
    Join Date
    Aug 2005
    Location
    Oshkosh, Wi.
    Posts
    2,133

    Default

    Mine is set-up to hit my shift point (when shift light comes on) in forth gear at the start of the traps in the 1/4. I don't change it for any 1/8 mi races. I'd start with stock and go from there after you make a bunch of passes.
    Last edited by kingofvenus; 10-30-2020 at 06:47 PM.
    Dee Durant '83 750es (Overly molested...) '88 gl1500 (Yep, a wing...)

  3. #3
    Join Date
    Jun 2003
    Location
    Abilene Texas
    Posts
    2,719

    Default

    GS1100E run's 14/46 on a 630 chain with M/T 7" slick, small shot of nitrous it hits the rev limiter at 10400 right pass the 1/8 mile in 4th gear. I shift at 10K.

    You can hear it here

    https://fb.watch/1wx7JQGpUh/
    Last edited by RacingJake; 11-02-2020 at 11:14 PM.
    1166cc 1/8 ET 6.09@111.88
    1166cc on NOS, 1/8 ET 5.70@122.85
    1395cc 1/8 ET 6.0051@114.39
    1395cc on NOS, 1/8 ET 5.71@113.98 "With a broken wrist pin too"
    01 Sporty 1/8 ET 7.70@92.28, 1/4 ET 12.03@111.82

  4. #4
    Join Date
    Aug 2006
    Location
    Des Moines , IA
    Posts
    2,806

    Default

    stock engine will run out like a wild cat with a 14-49-48-47 and get to top of 5th gear at redline. -- but you are going to wheelie off of the line. wheelie bars 68" wheelbase suggested for that approach..

    next choice is almost stock 15-47- 46 maybe 45 and your launch will be manageable
    SUZUKI , There is no substitute

  5. #5
    Join Date
    Dec 2019
    Location
    Portland, Oregon
    Posts
    86

    Default

    I appreciate the info!

  6. #6
    Join Date
    Jan 2013
    Location
    SW. Florida 90 miles south of Tampa
    Posts
    1,138

    Default

    My stock wheel base no bar 1150 went 9.72@146mph 17/48 530 gearing. Which is the same as stock gearing.
    No problems with the wheelie’s but I was using a MTC slider clutch.
    I agree with Trip a 15/45t or 47t rear would be pretty gearing for stock wheel base stock motor. IMO
    My stable
    84 GSX1100EFG-10.62 @ 125 mph 64'' W/B.
    85 GS1150-9.72@146mph stock W/B.
    88 GSXR1100-dragbike 9.18@139.92mph/5.68@118mph.
    98 Bandit 1200-9.38@146mph/6.02@121mph.
    90 Suzuki GS 1425cc FBG Pro Stock chassis 5.42@124mph
    06 GSXR750 10.44@135mph
    00 Honda elite 80 pit bike

  7. #7
    Join Date
    Dec 2019
    Location
    Portland, Oregon
    Posts
    86

    Default

    phatty_mcwheelerton.jpg

    Thanks again for the additional info! The bike came with an ~8" over swingarm with the spares (I think it's Trac Dynamics). I replaced the stock swingarm last month. A buddy made an axle for me and I built wheel spacers and a caliper carrier last week. I don't have an overall wheelbase measurement, but it's ~36" center-to-center from the front sprocket to the rear axle (I wanted that number to figure out chain length).

    I also fit the 5.5" rear wheel I got, to replace the 3.5" stocker that was in it before.

    Will need to adjust the wheelie bar cross-braces to work with the longer swingarm.
    Last edited by patrino; 12-06-2020 at 04:32 PM.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •