What is 'Tall Gearing" ?

cartech · 27th January 2007, 11:35

Tried to find explanation about Tall/Short Gearing on TEAM-BHP. Can some one explain what is meant by Tall Gearing. What are its advantage vs Short Gearing(?). Thanks

tsk1979 · 27th January 2007, 12:37

Short or tall gearing refers to gear rations.
At certain rpm lets say 2000rpm the car will go at different speeds in different gears. Not only that two cars will go at different speeds at 2000rpm in their top gears.
So if you have taller 5th gear in car A than car B you will go faster at 2000rpm, which means more relaxed cruising for the engine.
Short gearing means that engine has to rev at a higher speed to get the same actual speed.
So in a shorter geared car you will get better acceleration but lower mileage because your engine is running at a high speed.

For example esteem as a very tall 2nd gear. At redline the second gear can cross 100kmph. At the same rpm in other cars the seond peaks out at around 80-90kmph at the same rpm.

ramzsys · 27th January 2007, 15:46

in addition, tall gearing may also be referred to the gear ratios: the step up from 1-2-3-4-5 should be smooth, as there should not be any un-necessary revving up in the prev gear to match the 'comfortable' speed of the next gear.

fuel efficiency is the main reason to provide tall gearing.

Rehaan · 27th January 2007, 23:14

You might also be able to extract some info from this thread >

Short vs Tall Gearing?

cya
R

27th January 2007, 11:35	#1
cartech BHPian Join Date: Jan 2007 Location: Mumbai Posts: 198 Thanked: Once	What is 'Tall Gearing" ? Tried to find explanation about Tall/Short Gearing on TEAM-BHP. Can some one explain what is meant by Tall Gearing. What are its advantage vs Short Gearing(?). Thanks
	(1) Thanks

27th January 2007, 12:37	#2
tsk1979 Team-BHP Support Join Date: Feb 2005 Location: San Jose, CA Posts: 23,717 Thanked: 22,825 Times View My Garage	Short or tall gearing refers to gear rations. At certain rpm lets say 2000rpm the car will go at different speeds in different gears. Not only that two cars will go at different speeds at 2000rpm in their top gears. So if you have taller 5th gear in car A than car B you will go faster at 2000rpm, which means more relaxed cruising for the engine. Short gearing means that engine has to rev at a higher speed to get the same actual speed. So in a shorter geared car you will get better acceleration but lower mileage because your engine is running at a high speed. For example esteem as a very tall 2nd gear. At redline the second gear can cross 100kmph. At the same rpm in other cars the seond peaks out at around 80-90kmph at the same rpm.
	(2) Thanks

27th January 2007, 15:46	#3
ramzsys Senior - BHPian Join Date: Dec 2006 Location: NH209 Posts: 1,775 Thanked: 1,462 Times	in addition, tall gearing may also be referred to the gear ratios: the step up from 1-2-3-4-5 should be smooth, as there should not be any un-necessary revving up in the prev gear to match the 'comfortable' speed of the next gear. fuel efficiency is the main reason to provide tall gearing.
	() Thanks

27th January 2007, 23:14	#4
Rehaan Team-BHP Support Join Date: Feb 2004 Location: Bombay Posts: 24,046 Thanked: 34,079 Times	You might also be able to extract some info from this thread > Short vs Tall Gearing? cya R
	() Thanks