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07-19-2021, 05:52 PM
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#1 |
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Senior Member
Join Date: Jun 2006
Posts: 541
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gear change
Is there a formula that tells the rpm drop at the finish line between different rear gears ? 5.11 to 4.88 to 4.56 etc.
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07-19-2021, 05:55 PM
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#2 |
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Member
Join Date: Apr 2010
Posts: 266
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Re: gear change
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07-19-2021, 06:25 PM
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#3 | |
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Senior Member
Join Date: May 2020
Posts: 517
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Re: gear change
Quote:
not as neat as that one but usable. |
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07-19-2021, 08:14 PM
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#4 |
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Senior Member
Join Date: Feb 2002
Location: Southeast Michigan
Posts: 909
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Re: gear change
The only iffy part of the calculation is what you use for converter slip . The higher you rev the engine the less slip you get with the torque converter .
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07-20-2021, 06:40 AM
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#5 |
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VIP Member
Join Date: Dec 2001
Location: Texarkana Ark/TX
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Re: gear change
old fashion way
4.88 divided by 5.13 =.9513 4.87% difference 4.56 divided by 5.13 = .8889 11.11% difference Original RPM + or - the % difference The real life number change may vary due to converter slip and/or tire growth.
__________________
Adger Smith (Former SS) Last edited by Adger Smith; 07-20-2021 at 06:43 AM. Reason: sp |
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07-20-2021, 07:27 AM
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#6 |
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Junior Member
Join Date: Feb 2019
Location: Lake City, Fl.
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Re: gear change
RPM X C
_______ = MPH G X 1056 MPH X G X 1056 ______________ = RPM C MPH X G X 1056 _____________ = C RPM RPM X C ____________ = G MPH X 1056 RPM = REVS PER MINUTE C = TIRE CIRCUMFRUNCE (UNLOADED) G = GEAR RATIO MPH = MILES PER HOUR You can move the numbers around in the formulas to tell differences of changes. Has worked great for me. Not real scientific but fun. |
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