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Old 10-18-2010, 10:11 AM   #1
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Question Do I have this math right?

4.10s compared to 3.45s is 16% tighter. Since gears are the muliplier to the power that goes to the ground this should follow that tq increases 16%.
So this would bring my low end tq at 3,000rpms from 410TQ to 476TQ
And the top end HP from 610HP to 708HP
Max TQ from 538TQ to 624TQ

Does this math work out? will the acceleration G-Force increase be the same as I increased power like that?

I will measure on Kat Matrix accleration G-Force in second gear now then after gears and see what the increase is.
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Old 10-19-2010, 10:47 PM   #2
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Old 10-19-2010, 10:48 PM   #3
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I just got dizzy, lol
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Old 10-19-2010, 11:13 PM   #4
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math does that.. but comes in handy I used it to measure what my HP would be with 2" over 1 7/8" headers going by the % difference someone got by installing 2" headers on stock engine.
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Old 10-20-2010, 04:57 AM   #5
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Originally Posted by GQ4Life View Post
4.10s compared to 3.45s is 16% tighter. Since gears are the muliplier to the power that goes to the ground this should follow that tq increases 16%.
So this would bring my low end tq at 3,000rpms from 410TQ to 476TQ
And the top end HP from 610HP to 708HP
Max TQ from 538TQ to 624TQ

Does this math work out? will the acceleration G-Force increase be the same as I increased power like that?

I will measure on Kat Matrix accleration G-Force in second gear now then after gears and see what the increase is.

You won't show additional torque on the dyno but you will realize an improvement equivalent to those numbers in acceleration.
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Old 10-20-2010, 05:05 AM   #6
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You'll probly lose power on the dyno but the car will pull harder.
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Old 10-20-2010, 05:42 AM   #7
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Yea I know it doesn't show on dyno just wondering though will car be as fast as if it had that power. Going to matrix that shows acceleration G's that should show how hard its pulling
Also if holds true new trap speed should be about 128mph
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Old 10-20-2010, 06:50 AM   #8
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Yea I know it doesn't show on dyno just wondering though will car be as fast as if it had that power. Going to matrix that shows acceleration G's that should show how hard its pulling
Also if holds true new trap speed should be about 128mph
Just take your skirt off and do it already. You'll be glad you did. You better do something or your dad is going to smoke you!
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Old 10-20-2010, 07:01 AM   #9
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Just take your skirt off and do it already. You'll be glad you did. You better do something or your dad is going to smoke you!
4.10 gears or not he is going to smoke me.. he wants to do gears too on top of LS3 conversion with cam..
Im making appointment when I get back from FL. Figured already in debt whats another 2 grand

PS just trying to figure out how fast the car will be.. on my quest for 130mph trap speed.
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Old 10-20-2010, 09:23 AM   #10
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Yea I know it doesn't show on dyno just wondering though will car be as fast as if it had that power. Going to matrix that shows acceleration G's that should show how hard its pulling
Also if holds true new trap speed should be about 128mph
What were you trapping before??? If you trap 128mph with 4.10s, that means you were trapping 130+ mph with your stock gears.

Going to a steeper gear lowers your trap mph, given all other variables stay the same.
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Old 10-22-2010, 02:32 PM   #11
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What were you trapping before??? If you trap 128mph with 4.10s, that means you were trapping 130+ mph with your stock gears.

Going to a steeper gear lowers your trap mph, given all other variables stay the same.
Well I would assume it would go up a little..
Example. My dads camaro has a lot less power then mine but tighter gears and he trapped just 1mph less then me. So I am sure gears raise mph. I just dont know by how much.

why would you assume trap would go down?
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Old 10-22-2010, 02:43 PM   #12
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Well I would assume it would go up a little..
Example. My dads camaro has a lot less power then mine but tighter gears and he trapped just mph less then me. So I am sure gears raise mph. I just dont know by how much.

why would you assume trap would go down?
I'm not assuming. That is what happens 99% of the time. This is from first hand experience.

Think about it.

When you change gears, you are not adding or taking away power. You are still putting down roughly the same power to the ground (actually, if you want to be technical you are going to be putting down a few horsepower LESS with the 4.10s, because you have more parastic drivetrain loss with them, compared to the 3.73's).

Regardless, the only thing you are changing is how fast you get into your powerband..... the steeper gear you go, the faster you get in your powerband, the faster you complete the 1320'.

So, for instance, it would take you 12.0 seconds to complete 1320 feet, and you would reach 118 mph. Well since you are going to be getting into your powerband faster, you will accellerate faster, but power will stay the same. So you will reach 30 mph faster, 60 mph faster, 90 mph faster, etc.
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Old 10-23-2010, 05:11 PM   #13
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Just a note, he's got an LS3 not an L99, so the rear's would be 3.45's not 3.73's in your comparison
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Old 10-23-2010, 05:23 PM   #14
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Just an additional note, neither the LS3 or the L99 come from the factory with 3.73 gears. I was just using the 3.73 gear set as an example.
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Old 10-23-2010, 05:25 PM   #15
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Word, anyone know if 4.10's are still breaking like there's no tomorrow?
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Old 10-23-2010, 05:48 PM   #16
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mine did
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Old 10-23-2010, 08:08 PM   #17
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the most recent GMHTP magazine posted a 2 tenth increase. traps were not posted.

both of my 4th gens had 4:10's... i love those gears with a 6-speed.
imo. the only real benefit is the pleasue of driving. not much performance gained...

maybe one of the worst bang for bucks?
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Old 10-23-2010, 08:42 PM   #18
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the most recent GMHTP magazine posted a 2 tenth increase. traps were not posted.

both of my 4th gens had 4:10's... i love those gears with a 6-speed.
imo. the only real benefit is the pleasue of driving. not much performance gained...

maybe one of the worst bang for bucks?
Are you saying not much performance gained w/ 4.10's??? I'd have to argue, I think it's the best bang for buck mod I've done so far. It's a night/day difference.
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Old 10-23-2010, 10:13 PM   #19
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I'm not assuming. That is what happens 99% of the time. This is from first hand experience.

Think about it.

When you change gears, you are not adding or taking away power. You are still putting down roughly the same power to the ground (actually, if you want to be technical you are going to be putting down a few horsepower LESS with the 4.10s, because you have more parastic drivetrain loss with them, compared to the 3.73's).

Regardless, the only thing you are changing is how fast you get into your powerband..... the steeper gear you go, the faster you get in your powerband, the faster you complete the 1320'.

So, for instance, it would take you 12.0 seconds to complete 1320 feet, and you would reach 118 mph. Well since you are going to be getting into your powerband faster, you will accellerate faster, but power will stay the same. So you will reach 30 mph faster, 60 mph faster, 90 mph faster, etc.
Thanks for the explanation. That does make sense. I do know 4.10s do cause more drive train loss. But thoguht it increases the TQ multiplier of what is going to the ground. Wondered why it never showed up on dynos though.
I am doing gears to have more umph from the line in 1st low rpms.
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Old 10-23-2010, 10:14 PM   #20
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Are you saying not much performance gained w/ 4.10's??? I'd have to argue, I think it's the best bang for buck mod I've done so far. It's a night/day difference.
Oh didnt realize you did 4.10s.. how much your times improve?
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Old 10-24-2010, 10:40 AM   #21
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Oh didnt realize you did 4.10s.. how much your times improve?
The car hasn't seen the track yet...but believe me, it's a whole different car. Even the clutch feels smoother. The only concern I'd have w/ your setup is getting it to hookup at the track.
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Old 10-24-2010, 10:58 AM   #22
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The car hasn't seen the track yet...but believe me, it's a whole different car. Even the clutch feels smoother. The only concern I'd have w/ your setup is getting it to hookup at the track.
I was thinking about that too.. But Id like a little more low end umph for getting her moving.
So does you car accelerate faster at 75mph then it use to with stock gears?
kit matrix be easy to tell. it can tell you the G force of acceleration
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Old 10-24-2010, 11:00 AM   #23
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I was thinking about that too.. But Id like a little more low end umph for getting her moving.
So does you car accelerate faster at 75mph then it use to with stock gears?
kit matrix be easy to tell. it can tell you the G force of acceleration
it accelerates faster at all speeds

sent you a PM
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Old 10-24-2010, 11:23 AM   #24
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I was thinking about that too.. But Id like a little more low end umph for getting her moving.
So does you car accelerate faster at 75mph then it use to with stock gears?
kit matrix be easy to tell. it can tell you the G force of acceleration

The car accelerates a crapload faster on the highway there gregy. It seriously feels like you another 100 hp. I thought Ted was going to talk to you about dons rear? Just do it!!!!!
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Old 10-24-2010, 11:28 AM   #25
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DON'T FEAR THE GEAR!

/thread
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