Gear change

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Jul 21, 2017 | 06:55 PM

Hek76

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3rd Gear

Joined: Jul 2017

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Gear change

Recently changed the gear in my 1980 Z28. Had a 3.08 and ran the 660 in 8.61.

Just dropped a 4.53 in it and wondering what I should expect for times now.

Jul 25, 2017 | 05:17 PM

Glensgages

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Joined: Jan 2003

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From: State of Confusion

Quote:

Originally Posted by Hek76

Recently changed the gear in my 1980 Z28. Had a 3.08 and ran the 660 in 8.61.

Just dropped a 4.53 in it and wondering what I should expect for times now.

I bought a 1979 Z28 (equipped with 3.42 gears) new in late 1978, and by 1981, we had it running 14.30'-14.40's @ 97 MPH, with a 5,500 shift point, on the OEM 225/70R15 Uniroyals

in 1984, we swapped a set of 4.10's into the car, and with no other changes it rattled-off a string of 14.10's-14-flats (or 3 / 10ths in the quarter-mile), still at the same MPH

I would 'think', that with a switch from an even-lesser efficient 3.08, to the even-more performance oriented 4.53, IF you can maintain traction, you will easily run 8.20's, and possibly dip into the 8-teen range in the 1/8th mile

Jul 26, 2017 | 09:16 AM

C5 Pete

AMP Racing

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From: Washington TWP NJ

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Tire choice will be pretty important with that gearing. But, I agree with Glen. Provided you have traction, you should drop a significant bit of ET.

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