Gear Ratio?
Thread Starter
Safety Car
Joined: Apr 2008
Posts: 4,833
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From: NJ
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Gear Ratio?
What gear ratio does the base and Z51 have? And where in the Vin or build info can I find that information? Thank you!
Drifting
Joined: Apr 2022
Posts: 1,396
Likes: 1,323
From: Melbourne Florida’s Barrier Islands
I used google… “Chevy fits the Z51 with a shorter (numerically higher) final-drive ratio to improve acceleration. Base C8s get a 4.89:1 final-drive ratio, whereas Z51s are fitted with a 5.17.”
Not sure why they would bother with this small of a difference unless they were trying to optimize certain time to speed/distance times. Maybe they wanted another marketing line item for the Z51 package.
Not sure why they would bother with this small of a difference unless they were trying to optimize certain time to speed/distance times. Maybe they wanted another marketing line item for the Z51 package.
Burning Brakes
Joined: Nov 2022
Posts: 975
Likes: 463
Be certain that we will not "feel" a miniscule 5% difference in gearing(not HP). Anyone who tells you that they can tell the difference of full of crap. There are still many guys who paid 5 grand more for this academic difference and believe that they have a faster car.
Drifting
Joined: Apr 2022
Posts: 1,396
Likes: 1,323
From: Melbourne Florida’s Barrier Islands
Be certain that we will not "feel" a miniscule 5% difference in gearing(not HP). Anyone who tells you that they can tell the difference of full of crap. There are still many guys who paid 5 grand more for this academic difference and believe that they have a faster car.
Safety Car
Joined: Nov 2007
Posts: 4,435
Likes: 874
From: Bay Area CA
As you can see in the above chart, the transmission gears and ring and pinion gears (not listed 3.55) are the same. However, on the Z51 the transfer gear is 1.46 vs 1.38 (non Z51) giving the Z51 higher numerical overall torque multiplication and final drive ratio (5.18 vs 4.89). The higher numerical Z51 transfer gears allow an advantage coming out of turns along with the E-differential. This might seem minimal, but with several laps on a track this improves overall time. Straight line performance is about .1 of a second faster for the Z51 which is a driver's race. I'm not going to make this a Z51 vs non Z51 discussion, just giving the facts. You decide what works best for you.
Your build sheet with the RPO codes will state Z51: Z51 performance package.
Your build sheet with the RPO codes will state Z51: Z51 performance package.
Last edited by Mike's LS3; Jul 9, 2023 at 11:48 AM.
Instructor
Joined: Oct 2021
Posts: 224
Likes: 282
Be certain that we will not "feel" a miniscule 5% difference in gearing(not HP). Anyone who tells you that they can tell the difference of full of crap. There are still many guys who paid 5 grand more for this academic difference and believe that they have a faster car.
Safety Car
Joined: Nov 2007
Posts: 4,435
Likes: 874
From: Bay Area CA
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Burning Brakes
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From: SC from CT
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I used google… “Chevy fits the Z51 with a shorter (numerically higher) final-drive ratio to improve acceleration. Base C8s get a 4.89:1 final-drive ratio, whereas Z51s are fitted with a 5.17.”
Not sure why they would bother with this small of a difference unless they were trying to optimize certain time to speed/distance times. Maybe they wanted another marketing line item for the Z51 package.
Not sure why they would bother with this small of a difference unless they were trying to optimize certain time to speed/distance times. Maybe they wanted another marketing line item for the Z51 package.
