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Author Topic: What is a good gear ratio for a 1600lb 400hp fed car is just for fun  (Read 11267 times)

Offline ricci32

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What is a good gear ratio for a 1600lb 400hp fed car is just for fun
« on: February 18, 2014, 06:10:33 AM »
 Looking to stay around 10 sec the car was used for 1/8 mile drags it has a 9" ford rear and worked turbo 350 trans motor is 400hp looking to have fun what would be a good ball park gear and keep rpm under 7k. car is 1600lbs
 
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Offline ricci32

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Re: What is a good gear ratio for a 1600lb 400hp fed car is just for fun
« Reply #1 on: February 18, 2014, 06:11:28 AM »
Looking for a 1/4 mile gear.

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Offline George

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Re: What is a good gear ratio for a 1600lb 400hp fed car is just for fun
« Reply #2 on: February 18, 2014, 07:18:11 AM »
Start with some online calculators. http://www.wallaceracing.com/Calculators.htm
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Offline George

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Re: What is a good gear ratio for a 1600lb 400hp fed car is just for fun
« Reply #3 on: February 18, 2014, 07:19:47 AM »
Tire size and rim size will be needed.
« Last Edit: February 18, 2014, 08:50:56 AM by George »
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Offline ricci32

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Re: What is a good gear ratio for a 1600lb 400hp fed car is just for fun
« Reply #4 on: February 18, 2014, 08:31:37 AM »
will check tire and wheel size tonight
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Offline ricci32

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Re: What is a good gear ratio for a 1600lb 400hp fed car is just for fun
« Reply #5 on: February 18, 2014, 09:36:28 AM »
M&h 29.5  15x7 rim.
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dreracecar

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Re: What is a good gear ratio for a 1600lb 400hp fed car is just for fun
« Reply #6 on: February 18, 2014, 10:48:37 AM »
1600# w/ 400hp direct(no loss) ET is between 9.5-9.80
general assumtion is that its around 140-145 mph
30" tall tire @7000 running @ 145mph  would put you at a 4:30
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Offline PSweeney

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Re: What is a good gear ratio for a 1600lb 400hp fed car is just for fun
« Reply #7 on: February 19, 2014, 09:19:16 AM »
I'd put wheelbase and trans braked box in the mix to.   A short car with a braked 3sp box on 4.30's will be lively.   Also depends what the useage of the car would be.  For a bracket car, I'd run taller ratio to tame the launch and give you the legs for a big end charge.   
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dreracecar

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Re: What is a good gear ratio for a 1600lb 400hp fed car is just for fun
« Reply #8 on: February 19, 2014, 09:47:08 AM »
Its a bracket car, dial in for consistecy and leave first ---hard to beat
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Offline hotrod316

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Re: What is a good gear ratio for a 1600lb 400hp fed car is just for fun
« Reply #9 on: February 19, 2014, 02:55:47 PM »
we run 33" x 10.5, 456, gear 8 3/4 rear, with a  sb chey very stock, hyd cam 6000 at the big end, 138 mph 9:50 on a 9.50 index. 1450 lbs race ready.
 33% pure fun 8) about 2 tens more
50% it will go FASTER OR BOOOOOOOOOOOOOOOM!!!!!!!! :D   
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Offline ricci32

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Re: What is a good gear ratio for a 1600lb 400hp fed car is just for fun
« Reply #10 on: February 20, 2014, 03:18:24 AM »
thanks guys the car has a scat balanced rotating assembly and a hydraulic roller procomp aluminium heads. The car has a 120" wheelbase and is on 29.5 x8 tires the guy prior to me ran only 1/8 drags and shifted all three gears. I want to use the car for nostalgia events and don't want to get to crazy. car has a foot brake and currently launches in low.
 
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Offline ss4

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Re: What is a good gear ratio for a 1600lb 400hp fed car is just for fun
« Reply #11 on: November 21, 2014, 08:47:11 AM »
Quote from: hotrod316 on February 19, 2014, 02:55:47 PM
we run 33" x 10.5, 456, gear 8 3/4 rear, with a  sb chey very stock, hyd cam 6000 at the big end, 138 mph 9:50 on a 9.50 index. 1450 lbs race ready.
 33% pure fun 8) about 2 tens more
50% it will go FASTER OR BOOOOOOOOOOOOOOOM!!!!!!!! :D

hey there hotrod316   I am running the same combo but motor will turn 7000 to 7500.  any thoughts on gear for this one?  currently running 9.0 at 158 and 5200rpm
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