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08-21-2020, 09:49 PM | #1 |
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Join Date: Dec 2010
Location: KY
Posts: 33
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RPm on open road
What is preferred rpm when on open road? Fresh 37, 21 stud engine 3:55 gears . Choice of tires open. Shift at 25 and 38 mph. Expect lots of open road driving. Don’t want to over rev it on long trips.
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08-21-2020, 10:02 PM | #2 |
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Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: RPm on open road
It is somewhat a matter of personal preference. 2500 isn't a bad starting point.
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08-21-2020, 10:14 PM | #3 |
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Location: Orcas Island Washington
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Re: RPm on open road
Do you have a tach?
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08-22-2020, 03:44 AM | #4 |
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Join Date: Feb 2011
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Re: RPm on open road
Here is a calculator to give you an idea where you are with your car RPM.
600-16 bias tires are about 28-28.5” tall. With 3.55 gears you will turn abt. 2350 @ 55, your engine should be happy. The Columbia chart gives a close comparison too. http://www.csgnetwork.com/multirpmcalc.html
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Tim Downtown, Ca Last edited by CA Victoria; 08-22-2020 at 04:05 AM. |
08-22-2020, 05:28 AM | #5 |
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Re: RPm on open road
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08-22-2020, 06:56 AM | #6 |
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Re: RPm on open road
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08-22-2020, 08:41 AM | #7 |
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Join Date: Nov 2012
Location: Wichita KS
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Re: RPm on open road
I think it is easier to just run the numbers.
RPM = (Axle Ratio x MPH x 336) ÷ (Tire Dia) Last edited by JSeery; 08-22-2020 at 09:38 AM. |
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