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Post by Guest on Jan 16, 2011 15:39:08 GMT -5
I have a need to know how to be sure I have a true 4.11:1 gear ratio. What height tire must I use before changing the ratio to a higher one due to excessive tire height? Is there a formula? How does one tell the ratio is actual? Thanks
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Post by hyerus1 on Jan 16, 2011 18:18:14 GMT -5
www. wallaceracing.com. GO TO gear/tire calculator. PUT YOUR INFO IN AND BINGO!!!!!  HOPE THIS HELPS. OZZIE. |
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Post by guest on Jan 16, 2011 21:03:01 GMT -5
Thanks for trying Ozzie. It had no info on what I need.
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Post by Zero Budget Racing on Jan 19, 2011 20:01:57 GMT -5
The only way to get an Exact Ratio is to count the teeth on the pinion and the ring gears and divide the pinion into the ring, like if the pinion has 13 teeth and the ring has 40 teeth, 13 divided by 40 = 3.076923 or 3.08 gear ratio. you can get a close idea by marking the yoke, and turning the tire one revolution and count how may times the yoke turns, if it turns just a tick over 4 times then it is at least a 4.10/4.11 ratio. I know that when I had 4:11 gears with 28X10X14 I would spin the engine up to 7000 rpm, and when I went to 30X12X15 I would be shifting into 4th at about 1000ft and I had to go to a 5.13 ratio to get the rpms back up to 7000 in the lights in 4th. I hope this helps, Joe
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HOPE THIS HELPS. OZZIE.