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Stupid Question? Always wondered.

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Old 04-21-2010, 06:23 PM
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Blacksmoke
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Default Stupid Question? Always wondered.

Ok I know gears do not equal hp.

What do you call what taller gears get you exactly?
Just UMMPHH??
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Old 04-21-2010, 06:37 PM
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eolson
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It's called equivalent HP. Changing out to a Alum. 1 piece DR, alum. flywheel, shorter gears, and lighter wheels and tires all add a lot of equivalent HP Erik
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Old 04-21-2010, 06:37 PM
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notwise
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Better mechanical advantage?
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Old 04-21-2010, 07:06 PM
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liberty911
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Originally Posted by Blacksmoke

What do you call what taller gears get you exactly?
Just UMMPHH??
Torque. Not in increase in motor output torque, but a change in how the torque is delivered to the rear wheels. Higher gearing cause the torque to come on quicker making it feel like there has been a change in hp.
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Old 04-21-2010, 07:43 PM
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americaniron
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High gears= lower numbers aka 2:73s, or 3:08s. They give you more top end speed, like what you would expect for high speed #s..... Low gears= high numerical ratios aka 3:73s, 4:10s, 4:55s.... give you the engines torque at lower speeds, like what was said before, a mechanical advantage to get a car going in its lower RPM range.
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Old 04-21-2010, 08:15 PM
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ejanderson05gt
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Originally Posted by americaniron
High gears= lower numbers aka 2:73s, or 3:08s. They give you more top end speed, like what you would expect for high speed #s..... Low gears= high numerical ratios aka 3:73s, 4:10s, 4:55s.... give you the engines torque at lower speeds, like what was said before, a mechanical advantage to get a car going in its lower RPM range.
Not to sound like an ***, but I just thought I should correct one part of your post. Gear ratio isn't measured like 3:73. It's 3.73:1, or 3.73's for layman's terminology. Other than that, +1 on the info!
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Old 04-21-2010, 08:27 PM
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SpartaPerformance
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Gear swap equals torque multiplication to the drive axles, for example lets say your vehicle makes 100 lb-ft of torque at 2,000rpm and your in 3rd gear and third gear is 1.84:1

100 lb-ft x 1.84:1 3rd gear x 3.27:1 stock gear = 601.68 lb-ft torque to drive axle

100 lb-ft x 1.84:1 3rd gear x 3.73:1 FRPP gear = 686.32 lb-ft torque to drive axle
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Old 04-21-2010, 08:29 PM
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usc49erfan
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Originally Posted by Blacksmoke
Ok I know gears do not equal hp.

What do you call what taller gears get you exactly?
Just UMMPHH??
a much more fun ride,
basically speaking the length of time from the accleration to "kick in" is decreased with 3.73's, 4.10's, etc. compared to 3.08, 2.73's, etc
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Old 04-21-2010, 08:33 PM
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dmhines
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Think of a bike with different gears (speeds).

If you race a guy from a dead stop that has the same leg strength as you and he is riding a single speed bike and you are riding a 10-speed bike in the lowest gear ... who is gonna accelerate faster? That's what gears do for a car.
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Old 04-21-2010, 09:03 PM
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baddog671
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acceleration
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