someone explain gears to me
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Joined: Apr 2008
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From: the race track
someone explain gears to me maybe im not putting the right words in search or clicking on the right FAQ. maybe i even skipped over what i was looking for.
what i want to know is why someone would want to change from stock gears and going to 4.10s? a car has say 380 hp & 360 torque, does 12.00s in the 1/4, runs a 295/45/17 inch tire and is also a 6 speed car. this is to try to settle an argument im having.
all im really finding is stuff for automatics.
what i want to know is why someone would want to change from stock gears and going to 4.10s? a car has say 380 hp & 360 torque, does 12.00s in the 1/4, runs a 295/45/17 inch tire and is also a 6 speed car. this is to try to settle an argument im having.
all im really finding is stuff for automatics.
Gears increase supplied torque from the driveshaft to the axles.
Let's use a 325hp/350tq engine with a 6 speed in 4th gear as example.
350 ft.lbs. into 3.42s' gives 1197 ft.lbs. to the axles.
350 ft.lbs. into 4.10s' gives 1435 ft.lbs. to the axles.
A 21% increase in torque to the pavement.
Will make that 325hp car 'feel' like it has 393hp.
Stronger acceleration !
Let's use a 325hp/350tq engine with a 6 speed in 4th gear as example.
350 ft.lbs. into 3.42s' gives 1197 ft.lbs. to the axles.
350 ft.lbs. into 4.10s' gives 1435 ft.lbs. to the axles.
A 21% increase in torque to the pavement.
Will make that 325hp car 'feel' like it has 393hp.
Stronger acceleration !
Thread Starter
TECH Apprentice
Joined: Apr 2008
Posts: 392
Likes: 0
From: the race track
Gears increase supplied torque from the driveshaft to the axles.
Let's use a 325hp/350tq engine with a 6 speed in 4th gear as example.
350 ft.lbs. into 3.42s' gives 1197 ft.lbs. to the axles.
350 ft.lbs. into 4.10s' gives 1435 ft.lbs. to the axles.
A 21% increase in torque to the pavement.
Will make that 325hp car 'feel' like it has 393hp.
Stronger acceleration !
Let's use a 325hp/350tq engine with a 6 speed in 4th gear as example.
350 ft.lbs. into 3.42s' gives 1197 ft.lbs. to the axles.
350 ft.lbs. into 4.10s' gives 1435 ft.lbs. to the axles.
A 21% increase in torque to the pavement.
Will make that 325hp car 'feel' like it has 393hp.
Stronger acceleration !
i think that is what i was looking for.
what about the tune? i know changing gears can lower your mpg and throw off your speedo. what im wondering is can i just put in the gears an go?
Personally, I didn't like 4.10s. I thought 1st gear was way too short for the street. At the track, sure it launched hard, but on the street I ended up starting in 2nd and shifting to 4th all the time. I ended up going to 3.73s instead and loved it, until I got the blower and now 1st gear and 2nd gear are useless. Time to go back to 3.42s.
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4.10's for a n/a setup like that are going to be awesome IMO! That's what i'm running with my HCI setup through a 6-speed as well, and wouldn't have it any other way
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Here is the FACTS..............HP=how much work a engine will do....TQ=how fast it will do it. SO if you have 300hp and 300lb feet of TQ @ the engine THATS WHAT YOU GOT get to the ground to move the car.
SO the lower the gear ratio(4.10)the faster you get to use up the available HP so the car acellerates faster. BUT only to a certain point, unfortueately you are gonna run out of engine HP and TQ BEFORE you run out of road or 1/4 or what ever you are racing on. So you must gear it so you have optimized the available HP and TQ across the entire distance.
Understand you only have 300hp no matter how you gear it that will never change! The only thing you can change is how fast you use and that is through the gearing.
Good rule of thumb is 3.42s for automatics on the street AND 3.73 for 6 speeds manuals. Can't beat these ratios for all around performance on the street.
Hard core street gearing would be 3.73 automatic and 4.11 manual
SO the lower the gear ratio(4.10)the faster you get to use up the available HP so the car acellerates faster. BUT only to a certain point, unfortueately you are gonna run out of engine HP and TQ BEFORE you run out of road or 1/4 or what ever you are racing on. So you must gear it so you have optimized the available HP and TQ across the entire distance.
Understand you only have 300hp no matter how you gear it that will never change! The only thing you can change is how fast you use and that is through the gearing.
Good rule of thumb is 3.42s for automatics on the street AND 3.73 for 6 speeds manuals. Can't beat these ratios for all around performance on the street.
Hard core street gearing would be 3.73 automatic and 4.11 manual
Last edited by Camaroo1; Dec 8, 2012 at 04:38 PM.
Here is the FACTS..............HP=how much work a engine will do....TQ=how fast it will do it. SO if you have 300hp and 300lb feet of TQ @ the engine THATS WHAT YOU GOT get to the ground to move the car.
SO the lower the gear ratio(4.10)the faster you get to use up the available HP so the car acellerates faster. BUT only to a certain point, unfortueately you are gonna run out of engine HP and TQ BEFORE you run out of road or 1/4 or what ever you are racing on. So you must gear it so you have optimized the available HP and TQ across the entire distance.
Understand you only have 300hp no matter how you gear it that will never change! The only thing you can change is how fast you use and that is through the gearing.
Good rule of thumb is 3.42s for automatics on the street AND 3.73 for 6 speeds manuals. Can't beat these ratios for all around performance on the street.
Hard core street gearing would be 3.73 automatic and 4.11 manual
SO the lower the gear ratio(4.10)the faster you get to use up the available HP so the car acellerates faster. BUT only to a certain point, unfortueately you are gonna run out of engine HP and TQ BEFORE you run out of road or 1/4 or what ever you are racing on. So you must gear it so you have optimized the available HP and TQ across the entire distance.
Understand you only have 300hp no matter how you gear it that will never change! The only thing you can change is how fast you use and that is through the gearing.
Good rule of thumb is 3.42s for automatics on the street AND 3.73 for 6 speeds manuals. Can't beat these ratios for all around performance on the street.
Hard core street gearing would be 3.73 automatic and 4.11 manual
Also, 4.11's gears in a 6spd fbody is hardly "Hard Core"
the only thing i hate about my 4.10s is having to hit 5 gear in the 1/4 mile 
. granted i was limited to the stock rev limiter and stock tire size (for now) but i think im goin to 3.73's or 3.90's.
. granted i was limited to the stock rev limiter and stock tire size (for now) but i think im goin to 3.73's or 3.90's. 