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Discussion Starter · #1 ·
what ya think a first gen could put down 380hp 511 lbs at crank 400sbc 5600redline 2.73 rear th350 tranz lowered 4 inches z rated tires 17 inch 2454517 front 2953517 rear with a 125 pill just if needed im thinkin bout switching from street strip to hi speed driver moving to nevada long roads out there hehe
:D
 

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Big Engine, Little Truck
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I'm sure there is a calculator out there to compute HP/weight/gear ratio to top-end speed, but I would bet around 150 mph. I think the TH350 would hurt you, though. Eventually you will run out of gear, even with the 2.73. I would think an OD tranny would be very helpful for competitive top-end jaunts.

Of course some scientist type will reply with something about aerodynamic drag co-efficients and such that none of us will understand.
 

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Big Engine, Little Truck
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I found a few calculators on-line. Here is the link to one:
http://www.juric.org/mopar/tools/topspeed.php

There are a whole bunch of them. I typed "top speed calculator" into google and got them. Here is the text from one of them:



you can calculate your car's top speed in this following way:

you will need to know your car's final drive ratio and final gear ratio, size of your tires, and your engine's peak power rpm.

on a d16z6 engine the final drive ratio is 4.25:1 and the overdrive 5th gear ratio is .702:1

multiply the ratios together to get the absolute final drive ratio
(4.25 X .702 = 2.98:1)

to calculate the tire diameter have your tire size. ex: 185/65 14
multiply sidewall (185mm) by the aspect ratio (.65) to get 120.25mm. this is the sidewall on one side so multiply by 2 to get the top and bottom sidewall (120.25 X 2 = 240.5)
divide this number by 24.5 to convert mm into inches. (240.5/24.5 = 9.47)
add this number to the wheel diameter to get a total rolling diameter of 23.47 inches. (9.47 + 14 = 23.47)

here, i'll brake it down again: 185/65 14 size tires
185 X .65 = 120.25
120.25 X 2 = 240.5
240.5/24.5 = 9.47
9.47 + 14 = 23.47 this is your rolling diameter in inches.

for the d16z6 we'll use 6600 rpm instead of redline for peak power

now that you know the absolute gear ratio, tire diameter and maximum engine rpm you can apply this formula:

mph = (rpm X tire dimeter) / gear ratio X 336

(6600 X 23.47) / (2.98 X 336) = 154.7mph

but we all know a stock d16 wont go 154mph, its because of the gearing. top speed is done in 4th gear. the 4th gear ratio is .909:1. so that works out to be an overall gear ratio of 3.86:1 (.909 X 4.25 = 3.86)

so this works into the formula to equal 119.43 mph top speed on a stock engine (on level ground)

now you can play around with tire sizes and gear ratios to see how it will affect your top speed.
 

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Discussion Starter · #4 ·
cool thx for link i agree that the th350 will be a problem but i dont think any of the overdrived will hold od at full throttle i guess ill be lookin for a man tranz i would love to get 175 out of it ide piss off some of the euro trash in thir bmws lol
 
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