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10-11-2011, 07:15 AM
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#1 |
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Member
Join Date: Mar 2008
Posts: 132
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gear ratio
i am running a 1968 mustang set up like a stock eliminator car. the car has a 428cj, pro shifted toploader and 4.56 rearend. the car ran a 10.85 at 127mph. do you guys think it would et better with say a 4.88 gear? thanks ron
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10-11-2011, 09:57 AM
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#2 |
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VIP Member
Join Date: Oct 2008
Location: Somerset,Ky
Posts: 1,364
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Re: gear ratio
Use formula to gear for rpm you want @ finish line MPH X Gear ratio X 336 divided by tire height=RPM
Mike Taylor 3601 |
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10-11-2011, 10:15 AM
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#3 | |
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Senior Member
Join Date: Aug 2007
Location: California, Ky
Posts: 669
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Re: gear ratio
Quote:
But Yes you need a 4.88
__________________
Kris Rachford 69 Cobra 428CJ 4 Speed C/S 3032 |
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10-11-2011, 08:37 PM
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#4 |
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Member
Join Date: Aug 2009
Location: howell,nj
Posts: 124
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Re: gear ratio
if you where to use radial tire or bis ply tire is it the same formula????
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10-12-2011, 02:48 PM
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#5 |
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VIP Member
Join Date: Oct 2008
Location: Somerset,Ky
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Re: gear ratio
you would change tire height in formula,if you were trying to get that precise,but I don't know how tell how much tire growth would happen, rim/tire width,mph, sidewall etc. would all have to be factored.
I always have just used height on sidewall or mearsured and is close enough,any growth that happens is just a little cushion that keeps you from going over. I have always geared by this formula IE if want to go through @ 8K gear so I get as close to that # as can. Mike Taylor 3601 |
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