Performance axle ratio

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Mar 16, 2008 | 01:36 PM

fairweathercruiser

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Heel & Toe

Joined: Jun 2003

Posts: 19

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From: Highland NY

Performance axle ratio

I just bought a 2000 Corvette. It has the 3.15 performance axle ratio. What is the difference between that and the standard 2.71:1 ratio. How will that affect mileage, would I feel the difference in performance if two cars were side by side. What would the acceleration numbers and top speeds be with both ratios? Thanks, Henry

Mar 16, 2008 | 02:58 PM

Mike Mercury

Team Owner

Joined: Apr 2001

Posts: 54,204

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From: S.W. Ohio. . . . . . NRA Life Member

Quote:

Originally Posted by fairweathercruiser

I just bought a 2000 Corvette. It has the 3.15 performance axle ratio.

you can verify that here:
http://mikemercury.home.att.net/ratio.htm

Quote:

What is the difference between that and the standard 2.71:1 ratio.

the 3.15 gives the engine more mechanical advantage.

Quote:

How will that affect mileage, would I feel the difference in performance if two cars were side by side.

theoritically; the standard 2.73 ratio should give better MPG; but I got 28mpg on the highway with my 3.15's. The 3.15 should give better accceleration. I can tell the difference between the two; but it is minor.

Quote:

What would the acceleration numbers and top speeds be with both ratios? Thanks, Henry

Top speed in the C5 is not gearing restricted; it is HP restricted. You'll never tach-out with either the 2.73 or 3.15. unless you're running a lot more power than stock. You're more likely to see a higher top speed with the 3.15 due to the mechanical advantage they give - helping the car have more thrust to "push" the air aside.

Mar 18, 2008 | 06:16 PM

fairweathercruiser

Thread Starter

Heel & Toe

Joined: Jun 2003

Posts: 19

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From: Highland NY

Hey, Thanks a lot. I was just curious. Henry

Mar 18, 2008 | 07:53 PM

nmbis2k

Instructor

Joined: Jul 2001

Posts: 219

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From: exeter CA

a minor update....my Y2K coupe with the 2.73 gets over 30 mpg on long trips,cruise set on 70 mph.

Any number over 25 mpg is excellent, considering all of the performance available.

Mar 18, 2008 | 10:06 PM

Irish Whiskey

Melting Slicks

Joined: Sep 2002

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changed gears from 2.73's to 3.42's - mileage on hgwy is still over 29 mpg.that's with heads/cam;headers,high stall converter

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