GEARING OPINION

Everything from the motor to the wheels

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wfw70ss
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GEARING OPINION

#1 Post by wfw70ss » Sun Mar 23, 2008 8:02 pm

I HAVE A 71 NOVA FOOTBRAKE BRACKET CAR THAT JUST REPLACED A BASICALLY STOCK 350 ENGINE WITH A 385 INCH THAT NEEDS TO TURN 7300 RPMS.I RUN A GLIDE WITH A 1.76.I TOOK THE CAR TO THE TRACK FRIDAY AND THE MOTOR TURNED 6000 AT THE TRAPS.IT HAS A 4.88 GEAR NOW WITH 30X10 GOODYEARS.CAR RAN 6.85 AT 100.5 MPH.ANY SUGGESTIONS ON A GEAR?IM THINKING A 5.57 MIGHT BE THE RIGHT GEAR BUT I ONLY WANT TO SPEND THE 350.00 ONCE.THESE CALCULATORS ONLINE ARE KINDA CONFUSING.THANKS TIM

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vegaracer
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#2 Post by vegaracer » Mon Mar 24, 2008 7:22 am

To turn 7300 rpm, at 100 mph, using a 30 inch tire, you're going to need to run a 6.35 rear gear.

A 5.57 will let you run 6400 rpm through the traps.

I don't know how accurate these numbers are but here's where they came from:
http://www.ringpinion.com/Calc_RPM.aspx
Feenstra's Towing

1973 Vega
434 SBC, N.A.
Powerglide
9.01 @ 146

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moeraces
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gear

#3 Post by moeraces » Mon Mar 24, 2008 11:51 am

i ran a 6:33 in my truck with a 32 tall tire it was abt 7800 thru traps , most of the guys arnd here running close to that setup, run 6:30-6:50 gear for 1/8 mile

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Coonass On Gas
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stall

#4 Post by Coonass On Gas » Tue Mar 25, 2008 3:59 pm

what is your stall?
Treat Every day as it were your last.

WWW.COONASSONGAS.COM

77 corvette backhalf
weight 2950 w/o driver
482 735hp na 300shot out of the hole
1/8 th mile racing 5.77 121mph 1.29 60ft

wfw70ss
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#5 Post by wfw70ss » Tue Mar 25, 2008 7:29 pm

moeraces,ive seen your truck run at either n.e dragway or outerbanks or both!i run at n.e.the stall is an 8 inch tci stalls about 4600.i called richmond gear they recommended a 4.88 for 1/4 mile i told him i only run 1/8 they recommended 15% more gear so it would be a 5.57.
tim

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