2.4L LE5 Performance Tech 16 valve 171 hp EcoTec with 163 lb-ft of torque

lower gears?

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Old Oct 15, 2008 | 10:03 PM
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lower gears?

has any one looked into changing final drive gears in any of the cobalts? 2.0,2.2,2.4 mt/at?
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Old Oct 15, 2008 | 10:07 PM
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a few people have... why would you want to?
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Old Oct 15, 2008 | 10:09 PM
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why wouldn't you is the question
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Old Oct 15, 2008 | 10:11 PM
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well my question is more out of curiosity than any thing i just havent heard anything about it. I figured with all the performance minded people on here the would want more lower 0-60 eta's and quarters, instead of having a relativly high top end. but i wouldnt mind the extra low end zip, yah now i could care less about goin 110+ and all that crap!
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Old Oct 15, 2008 | 10:41 PM
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but first gear is sooo short as it is. a shorter final drive would make first gear worse... thats why i wouldnt do that. id get smaller tires before id go with a bigger final drive
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Old Oct 15, 2008 | 10:53 PM
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does any one know a vendor or custom fabricator capable of making one for 2.4 at?
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Old Oct 15, 2008 | 11:02 PM
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Lower gears would help out the auto crowd...but then you'd have to have the TCM tuned for the ratio too. I'd like to try a 4.30:1 final drive with a geared differential -- not by changing the chain gears
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Old Oct 16, 2008 | 05:14 PM
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Originally Posted by freakta
but first gear is sooo short as it is.
HA, Quoted for the truth!
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Old Oct 22, 2008 | 10:57 PM
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Can someone explain these "lower gears" to me? I'm fairly new to cars and still learning.
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Old Oct 22, 2008 | 11:35 PM
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Originally Posted by tambrico
Can someone explain these "lower gears" to me? I'm fairly new to cars and still learning.
How about as simple as it gets...which is easier to start off from a stop:

10 speed bike in 10th gear
10 speed bike in 1st gear

10th gear = 3.1 ratio on some bikes
1st gear = 14.1 ratio on some bikes

Simple answer right? 1st gear. That's because of mechanical leverage. The higher the number (ratio) the easier it is to get started (and accelerate) -- works the same on a car as it does on a bike. Drawback is the higher the ratio the higher the engine speed at cruise -- lower MPG.

Serious Drag Cars usually have 4.10, 4.56, 4.88, etc ratios
Street cars usually usually have 2.56, 2.78, 3.42, etc ratios

Final drive 3.63:1: 3.63 turns of engine = 1 turn of wheel (tranny in 3rd gear -auto)(tranny in 4th gear -manual) OD in transmission helps to slow the engine at cruise for better MPG.

How's that?

Last edited by Red07SSNA; Oct 22, 2008 at 11:51 PM.
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Old Oct 22, 2008 | 11:39 PM
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Don't you mean the lower the number the easier it is to get started? Starting in 10th gear on a bike isn't going to be easy, 1st gear is.
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Old Oct 22, 2008 | 11:41 PM
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What part of my simple explanation don't you get?

It is easy to get mixed up with the terms high (tall) and low when talking about car gears:

Lower means higher numerical gear, as in "he has some LOW gears in his dragster"
Taller means lower numerical gears, as in "he has some TALL gears in his roadster to get good gas mileage"
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Old Oct 22, 2008 | 11:46 PM
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Oh you mean ratio. NM sorry. Thought you meant which gear to start in. I read it wrong.
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Old Oct 22, 2008 | 11:47 PM
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Originally Posted by CC08
Don't you mean the lower the number the easier it is to get started? Starting in 10th gear on a bike isn't going to be easy, 1st gear is.
10th gear = 3.1 ratio on some bikes
1st gear = 14.1 ratio on some bikes

Should have included this in my original explanation!
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Old Oct 22, 2008 | 11:48 PM
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Oh muh god he changed his name to CC08! We still know who you are!

And OP, are you looking for a taller top gear for better highway mileage? Cause I can't see why you'd want shorter gears so I'm assuming that's not the case.
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Old Oct 22, 2008 | 11:49 PM
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Originally Posted by Acey
Oh muh god he changed his name to CC08! We still know who you are!

And OP, are you looking for a taller top gear for better highway mileage? Cause I can't see why you'd want shorter gears so I'm assuming that's not the case.
uh... ok? I actually requested the name change like 2 or 3 months ago and no **** you still know who I am why wouldn't you's? I just wanted a shorter simpler name. What else do you wanna ******* pick on huh? What is this 8th ******* grade?!? Jesus ******* christ I can't do anything without being analyzed 24/7 and have some one turn EVERY little thing they find into bashing me. It's getting ******* ridiculous now!!! GROW UP!!!!!!!!! IT'S BABYISH AND IMMATURE AND **** YOU DO IN 8TH GRADE!!!
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Old Oct 22, 2008 | 11:50 PM
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SS/SC is 4.05:1
I think the SS/TC is 4.3:1
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Old Oct 22, 2008 | 11:52 PM
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Originally Posted by Perfect.disguise
SS/SC is 4.05:1
I think the SS/TC is 4.3:1
If memory serves me right Chevy installed 3.8 series gearing in the SS/TC.

Hey...my memory isn't that bad yet:

from Chevy.com:

Highlights:
EPA estimated MPG 22 city, 30 highway
2.0L ECOTEC Turbo DOHC engine
Five-speed manual transmission with 3.84 axle ratio

WHY? To get the MPG up!!!!

Last edited by Red07SSNA; Oct 23, 2008 at 12:15 AM.
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Old Oct 22, 2008 | 11:54 PM
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Originally Posted by CC08
uh... ok? I actually requested the name change like 2 or 3 months ago and no **** you still know who I am why wouldn't you's? I just wanted a shorter simpler name. What else do you wanna ******* pick on huh? What is this 8th ******* grade?!? Jesus ******* christ I can't do anything without being analyzed 24/7 and have some one turn EVERY little thing they find into bashing me. It's getting ******* ridiculous now!!! GROW UP!!!!!!!!! IT'S BABYISH AND IMMATURE AND **** YOU DO IN 8TH GRADE!!!
...8th grade was probably the best year of my life thus far.
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Old Oct 23, 2008 | 11:58 AM
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the 2.4's have a 3.90 if i rember correctly
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Old Oct 23, 2008 | 12:43 PM
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Originally Posted by LS6Rally
the 2.4's have a 3.90 if i rember correctly
Automatic -- 3.91:1 to be exact....3.29:1 differential gears and the difference is made up in the chain gearing behind the converter.
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Old Oct 23, 2008 | 01:12 PM
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I think we're 3.82 that's what chevrolet.com said.
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Old Oct 23, 2008 | 06:19 PM
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Originally Posted by CC08
I think we're 3.82 that's what chevrolet.com said.
The Sport? If that's so then the 06 and 07 SS 2.4 has better performance gears -- 3.91s (auto).
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Old Oct 23, 2008 | 06:40 PM
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Originally Posted by Red07SSNA
]Five-speed manual transmission with 3.84 axle ratio

WHY? To get the MPG up!!!!
Then why are they rated 30 highways just like the SS/SC?

"The Cobalt SS's powertrain has a 3.82:1 final drive ratio, which was selected because it allows the turbocharged engine to remain in the optimal section of the torque band during shifts and while driving competitively on a racetrack. This enhances both the car's tangible performance measures and intangible fun-to-drive quotient."
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Old Oct 23, 2008 | 11:20 PM
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Originally Posted by Perfect.disguise
Then why are they rated 30 highways just like the SS/SC?

"The Cobalt SS's powertrain has a 3.82:1 final drive ratio, which was selected because it allows the turbocharged engine to remain in the optimal section of the torque band during shifts and while driving competitively on a racetrack. This enhances both the car's tangible performance measures and intangible fun-to-drive quotient."
I didn't make the numbers up.... What I copied and pasted came directly off the Chevy.com Cobalt SS Turbocharged webpage.
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