Trying to figure engine rpm's - FSB Forums
 
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post #1 of 5 (permalink) Old 11-16-2012, 10:58 PM Thread Starter
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Location: Forest, Ohio
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Bronco Info: 1981, 302, c6, 9" rear code 16. Warn lock out's. Edelbrock carb/intake. Sitting on 32's
Trying to figure engine rpm's

I maybe am searching for the wrong things I don't know. I have searched all over Google and many forums and I haven't found what I'm trying to figure.

I am planning on swapping a 1990 7.3idi into my bronco, I am going to use a ZF6 transmission out of a 2000 powerstroke.

I'm trying to figure what my engine rpm's are going to run. It is mainly going to be a road vehicle with limited off road use *Hopefully it will see moab a couple times*.

The zf has a 0.72 6th gear ratio, my Bronco has a 3.50 geared 9" rear end and 32" tires. If I swap it right now using all this what will my rpm's be at 55 mph or 60.

If I overlooked something let me know I cant find anything right now though......
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post #2 of 5 (permalink) Old 11-16-2012, 11:33 PM
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post #3 of 5 (permalink) Old 11-16-2012, 11:56 PM
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for reference, mine turns about 2k @ 65mph. 3.73's and 32" tires.

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post #4 of 5 (permalink) Old 11-17-2012, 11:52 AM
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Bronco Info: 1981 300ci 6cyl w/4bbl conversion. 4spd NP-435 manual. 32" tires.
Here's all the formulas you'll need. You can figure out any of the following if you have the necessary information.



Tire Diameter = (Speed * Transmission Gear Ratio* Final Drive * 336) / RPM

Speed = (Tire Diameter * RPM) / (Transmission Gear Ratio * Final Drive * 336)

Transmission Gear Ratio = (RPM * Tire Diameter) / (Speed * Final Drive * 336)

Final Drive = (RPM * Tire Diameter) / (Speed * Transmission Gear Ratio * 336)

RPM = (Speed * Transmission Gear Ratio * Final Drive * 336) / Tire Diameter


1981 Bronco. 300 I6. 465cfm Holley 4bbl. BFG A/T KO2 32x11.5" tires. NP-435 trans. EFI exhaust manifolds. 2.5" Exhaust. DUI performance ignition.
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post #5 of 5 (permalink) Old 11-17-2012, 12:07 PM Thread Starter
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Bronco Info: 1981, 302, c6, 9" rear code 16. Warn lock out's. Edelbrock carb/intake. Sitting on 32's
Quote:
Originally Posted by AbandonedBronco View Post
Here's all the formulas you'll need. You can figure out any of the following if you have the necessary information.



Tire Diameter = (Speed * Transmission Gear Ratio* Final Drive * 336) / RPM

Speed = (Tire Diameter * RPM) / (Transmission Gear Ratio * Final Drive * 336)

Transmission Gear Ratio = (RPM * Tire Diameter) / (Speed * Final Drive * 336)

Final Drive = (RPM * Tire Diameter) / (Speed * Transmission Gear Ratio * 336)

RPM = (Speed * Transmission Gear Ratio * Final Drive * 336) / Tire Diameter
Awesome thank you so much for the help
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