December 11th, 2019, 08:36 PM | #1 |
ninjette.org member
Name: John
Location: New Windsor
Join Date: Nov 2019 Motorcycle(s): GSXR 750, GSXR 600, Ninja 400, Ninja 300 Posts: 146
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Track Gearing
What gearing are you guys running on the track? I see that 14/45 is stock. That seems to work for the streets. Seems to give the bike good grunt to pass cars on the road. I see some like a 15 front sprocket for lower RPMS for more relaxed highway riding and better gas mileage. I have an aluminum 43 rear sprocket, I may try. Would like to get over 105mph without a problem. I do like the pull of the 14/45 gearing.
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December 11th, 2019, 10:49 PM | #2 |
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Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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Going to taller gearing (43t), will actually slow you down at track. That’s because you’ll end up with lower torque at rear-wheel and less linear thrust at contact patch and slower acceleration. Unless you’re already redlining top-gear on fastest straight, you don’t want taller gearing. If anything, you’ll want to use lower-gearing (46t) to give quicker acceleration and faster lap-times.
I adjust gearing so that I just barely kiss redline in top-gear at end of fastest straight at each track. Here’s relevant mods on my ‘09 250 race bike and gearing for each track. - 315-lbs with 1-gal petrol (-60 from stock) - full Tyga exhaust - dyno-tuned by Spears for +22% more power than stock (DynoJet stg2) - 428 chain conversion with alloy rear sprockets This is gearing I use at various tracks: 18x60t - tight tracks like Laguna Seca, Sears Point Sonoma, Streets of Willow Springs, Thunderhill West. Gearing lower than 520 14x46t for maximum acceleration. I might go to 18x61t next season at these tracks (other than Laguna) as I’m not redlining top-gear at any of them. 18x59t - same as 520 14x46t for longer tracks like Buttonwillow and Willow Springs 18x58t - still lower than factory 520 14x45t and just balances extra 22% power with top-speed @ redline at end of 10-sec straight at Thunderhill East. Hits actual 103mph on calibrated TrailTech Vapour digital dash (114mph on factory speedo). This is also calculated extra top-speed over factory 96mph top-speed with 22% more hp. Also helps to put chin on tank, tuck in elbows and hands with only pinky-finger on throttle to keep it WOT. Last futzed with by DannoXYZ; December 12th, 2019 at 09:15 AM. |
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December 12th, 2019, 08:02 AM | #3 |
ninjette.org guru
Name: Pat
Location: SW VA
Join Date: Feb 2015 Motorcycle(s): 286, 296, 599, 799 Posts: 436
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It should be noted 428 tooth counts are different from 520.
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December 12th, 2019, 08:09 AM | #4 |
ninjette.org member
Name: John
Location: New Windsor
Join Date: Nov 2019 Motorcycle(s): GSXR 750, GSXR 600, Ninja 400, Ninja 300 Posts: 146
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Thanks Danno. Pretty much what I figured. I plan on using the 250 on the more technical tracks with shorter straights. I agree more grunt will help on the more technical tracks coming out the turns. I will probably get an aluminum rear sprocket in the stock size just to lighten things up a bit. If I find a good deal on a full exhaust I will pull the trigger. If not I will just go with the current slip on and a stage 2 jet kit.
What is a 428 chain? Stock is the 520, I knew there is a 415 size. |
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December 12th, 2019, 08:45 AM | #5 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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I tried 415 chain once in beginning. Without O-rings, it didn’t last more than single season. That’s with cleaning and oiling 2x per day at track. A 428 chain is same pitch as 415, but can be had with O or X-rings. Has wider rollers than stock 520 with less weight and more durability. I’ve gotten 3-seasons out of 428 chain set-up, and that’s with 45-48 days at track each year. It only saves 2.5-lbs over stock compared to 3.5-lbs for 415, but well worth it for more durability. Read all about 428 conversions on Cramer or Sprocket Specialties site.
http://web.archive.org/web/201704230...x250/428.shtml Sticking with stock front sprocket & 520 chain, you may want to try 46t or even 47t rear sprocket on tighter tracks for faster acceleration. Watch out for wheelies! Last futzed with by DannoXYZ; December 12th, 2019 at 02:26 PM. |
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December 12th, 2019, 11:16 AM | #6 | |
ninjette.org member
Name: John
Location: New Windsor
Join Date: Nov 2019 Motorcycle(s): GSXR 750, GSXR 600, Ninja 400, Ninja 300 Posts: 146
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