coryv4 Posted June 27, 2012 Report Share Posted June 27, 2012 i have a 421 cub running 10lbs of boost i will be running 300Ft dirt i need a good starting point for tires and gearing i have a +12 swing arm and maybe a wheelie bar if it gets too much too handle. Quote Link to comment Share on other sites More sharing options...
RadarRacing Posted June 27, 2012 Report Share Posted June 27, 2012 Stock gearing works on most bikes in 300'. 14/41 or 15/44 and launch in 2nd and still top out at 85 mph in 5th. As for tire size it is totally dependant on swingarm length and whether or not you wanna run a bar. An 80hp or 120hp bike can run a +6 or 8 swingarm with a bar. Quote Link to comment Share on other sites More sharing options...
coryv4 Posted June 27, 2012 Author Report Share Posted June 27, 2012 Stock gearing works on most bikes in 300'. 14/41 or 15/44 and launch in 2nd and still top out at 85 mph in 5th. As for tire size it is totally dependant on swingarm length and whether or not you wanna run a bar. An 80hp or 120hp bike can run a +6 or 8 swingarm with a bar. i have know idea what my bike makes with the turbo. im just hopeing someone could put me in the ball park. Quote Link to comment Share on other sites More sharing options...
BigNasty Posted June 27, 2012 Report Share Posted June 27, 2012 i have know idea what my bike makes with the turbo. im just hopeing someone could put me in the ball park. Is 300' enough track length for the turbo to spool up and make power? Just asking..... If you have had it on the dyno. How long did it take for the turbo to spool up and make power? Quote Link to comment Share on other sites More sharing options...
coryv4 Posted June 27, 2012 Author Report Share Posted June 27, 2012 Is 300' enough track length for the turbo to spool up and make power? Just asking..... If you have had it on the dyno. How long did it take for the turbo to spool up and make power? with dirt tires i hit 10lbs almost instantly when i dump the clutch i would have to say it takes about 15-25ft to spool. Quote Link to comment Share on other sites More sharing options...
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