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Old 06-28-2006, 05:35 PM
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1/4 Mile times

I have a 28 Ford 5 Window coupe with a 283(.030 over), T-10 4 Spd, 10 Bolt rear (2.73) coil overs with ladder bars and 26 inch diameter 9" wide tires.

The motor has stock heads 9 1/2-1 compression(mild port 1.94/1.60 valves) 510 lift Competition cam and springs, Edelbrock performer RPM intake manifold w/600 CFM Holley 4 barrel carb and roadster headers(1 3/4 primaries).

My question is does anyone have a guestimate as to the times it would turn in the 1/4 mile just as it is and what would it take to put it into the 13's. I would like it fast but not unreliable to drive. It is primarily a cruise machine with occasional drag outings.

I know the common answer would be to go to a bigger motor but I would like to stick with the 283. Also money is of a concern as it is to all of us. The car has been put together with old parts found and donated along with help from EBay.

Thanks in advance for your help - Jerry

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Old 06-28-2006, 05:46 PM
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Who cares how fast it is as long as you like driving it. Speed is over rated. My idea of a cool street rod is that it has a lumpy idle, good sounding exhaust, and the ability to smoke the tires. (and the ability too drive and stop safely). On the street you will never see a 13sec 1/4 mile with out getting in trouble.

Just my .02

Steve
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Old 06-28-2006, 08:10 PM
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As light as your Model A is ... and with a 4 speed & 283, I do not believe you are far away from the 13's A different rear end ratio would HELP A LOT ... without really hurting the drive manners. I would go to a 3.25 or a 3.50 gear ratio in the rear ...

My Roadster weighs 2240 lbs, has a Turbo 400 transmission and has gone 12 flat a bunch of times ( has been lower on a few times ) but I have a fairly warmed up 350 ... Aluminum heads, aluminum intake, Hydraulic roller camshaft, roller rocker arms ect ...


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Old 06-29-2006, 10:21 AM
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Into the 13's

I'd start with gears & tires.

You have a pretty light car, but 2.73's are real granny gears with a stick.

Higher gears (3.73's, 4.11's) will give you a whole new gear to start with, and make your need for traction really apparent. It's where I'd start.
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Old 06-29-2006, 07:06 PM
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I'd guess 101 at 14.3 with the present setup. With a 4.11 rear gear, about 104 at 13.2 seconds.

Let us know how you do. (I'll hedge my guess a bit by saying that I've probably been a bit conservative on ET and I wouldn't be surprised if you were a little quicker. When it comes to estimating performance, the speed part is a whole lot easier than the ET. There are just too many variables!)
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Old 06-30-2006, 12:37 AM
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Check out this site for various calculators for drag racing:

http://users.erols.com/srweiss/#jcalc
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Old 06-30-2006, 05:13 AM
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Pages 2 and 3 of my blog:

http://home.earthlink.net/~whshope

contain spreadsheets for quarter and eighth mile performance. These are not just "estimators," but actual calculators. Using a generic torque curve, which you "tweak" with the values you input for your particular car, calculations are made every foot travelled, making it very easy to determine the effect of a change in axle ratio, transmission ratios, shift points, etc.
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Old 06-30-2006, 08:55 PM
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1/4 Mile times

Thanks for all the information. I'll post my times when I run the coupe(with the 2.73's) next month.
Thanks - Jerry
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Old 06-30-2006, 10:30 PM
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BillyShope - Thanks for the link, much more detailed than the other one.
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