Final Drive Ratio?

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May 18, 2004 | 05:35 PM

flynhi

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Le Mans Master

Joined: Aug 2000

Posts: 6,273

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From: Austin TX

Final Drive Ratio?

What's your opinion on optimum final drive ratio (first gear X diff) for my 383 with about 450 ftlbs torque and 255/55/17 rear wheel/tires?

May 18, 2004 | 06:34 PM

American Boy

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Joined: Jun 2001

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From: Quebec

Re: Final Drive Ratio? (flynhi)

Something in the range of 10 to 11:1 final drive is great for the street and occasionnal drag race with street tire.

I ran 9.08 and 10.78:1 with a 400 sbc on a 3800 lbs camaro and the 10.78 was by far better.

Stephan

May 18, 2004 | 11:34 PM

Glensgages

Race Director

Joined: Jan 2003

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From: State of Confusion

Re: Final Drive Ratio? (American Boy)

Quote:

...I ran 9.08 and 10.78:1 with a 400 sbc on a 3800 lbs camaro and the 10.78 was by far better....

I have run both 11.3:1 (2.75 x 4.11) and 12.54:1 (2.75 x 4.56) in a 3800 lb 10.3:1 cr, hydraulic-cammed 355"/8" converter/28" x 10" Goodyear slicked '79 Z28;
the 4.11s aren't as 'harsh' on the launch, offering more consistent 60' times, and my ETs are with-in .03-.06 of each other, too.

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