Changed Final Drive Gearing 2013

[AzBob_imp]

CIP, I am a bit surprised that taller gearing resulted in quicker acceleration as seems counter to what is done in the automotive world. Is because there is less shifting and more time with power to the ground?

A member here posted a 17 tooth front sprocket run, you will spin up the tach faster but it slows down forward motion.

http://cb1100forum.com/forum/showthread....ket+change

50-100 17 tooth 6.46 Shift point 42/68/90
Completely Stock 5.96 50/83
Yoshi Stock Gear 5.75 50/83
Gear change 19-38 5.61 60/95

This is a fair comparison since all runs are in the power-band and have two shift points. You can see how lower gears produce slower times.

Hope this is helpful.

A member here posted a 17 tooth front sprocket run, you will spin up the tach faster but it slows down forward motion.

http://cb1100forum.com/forum/showthread....ket+change

50-100 17 tooth 6.46 Shift point 42/68/90
Completely Stock 5.96 50/83
Yoshi Stock Gear 5.75 50/83
Gear change 19-38 5.61 60/95

This is a fair comparison since all runs are in the power-band and have two shift points. You can see how lower gears produce slower times.
The runs aren't comparable for a couple of reasons: 1. They weren't performed in the same weather (atmospheric density matters a ton, along with ambient air temperature) 2. They weren't performed on the same track/in the same area (inclination of the land and atmospheric density based on altitude) 3. They weren't performed by the same rider (variances in skill). 4. They weren't instrumented by a calibrated measuring device.

Higher gear ratios (lower numerically) make a vehicle accelerate SLOWER and lower gear ratios (higher numerically) make a vehicle accelerate FASTER. It's physics and there's no disputing it. I have raced cars for well over 20 years and this is the indisputable truth. You are mistaken in your assertion.
[/quote]
A member here posted a 17 tooth front sprocket run, you will spin up the tach faster but it slows down forward motion.

http://cb1100forum.com/forum/showthread....ket+change

50-100 17 tooth 6.46 Shift point 42/68/90
Completely Stock 5.96 50/83
Yoshi Stock Gear 5.75 50/83
Gear change 19-38 5.61 60/95

This is a fair comparison since all runs are in the power-band and have two shift points. You can see how lower gears produce slower times.
The runs aren't comparable for a couple of reasons: 1. They weren't performed in the same weather (atmospheric density matters a ton, along with ambient air temperature) 2. They weren't performed on the same track/in the same area (inclination of the land and atmospheric density based on altitude) 3. They weren't performed by the same rider (variances in skill). 4. They weren't instrumented by a calibrated measuring device.

Higher gear ratios (lower numerically) make a vehicle accelerate SLOWER and lower gear ratios (higher numerically) make a vehicle accelerate FASTER. It's physics and there's no disputing it. I have raced cars for well over 20 years and this is the indisputable truth. You are mistaken in your assertion.
Sorry Bob, but i disagree, put a set of low tractor gears in the CB and tell me what you run. The only thing you increase with lower gears is torque that's it, it may jump out of the hole, pull the wheels off the ground. There are equations used with different rears back in the day higher rears where not faster all the time, there is much more that goes into setting up for time.

BTW my runs where in the same area, temps may have varied a bit but all documented rather well.
Cheers
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You may disagree if you like but you're still wrong. Again, it's physics, there's really no room for argument. Saying all it does is increase the torque is like saying all spinach does is make Popeye stronger. With increased torque, more work can be done, and the vehicle accelerates faster because it moves the weight easier and therefore more quickly. This is the reason that vehicles powered by electric motors accelerate so quickly -- 100% of the motor's torque is available at all times and you don't have to wait for it to get to a certain RPM before the motor is outputting maximum torque.

Of course there are other considerations when _racing_, such as transmission shift points/gear ratios, available engine RPM, how many shifts are required to make it to the end of a 1/4 mile, where the engine makes it's power, etc., which must be balanced when talking about a particular kind of race, but none of that changes the fact that a lower gear ratio (higher numerically) will accelerate the vehicle faster at any given engine RPM.

Of course, lowering the final drive gear ratio (raising it numerically) will lower the absolute top speed of the vehicle.