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Old 08-06-2020, 12:28 PM   #1
Chris Hill
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Default Physics of Racing Torque Converters

Can anyone share the main governing equations for torque converters?

I think Russ Abrahams (sp) had something, but I can't remember them at this time.
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Old 08-06-2020, 02:53 PM   #2
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Default Re: Physics of Racing Torque Converters

One of the formulas is K=n/square root T

K is number that is the looseness of the converter
n is the stall speed
T is the engine torque



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Old 08-07-2020, 09:53 AM   #3
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Default Re: Physics of Racing Torque Converters

some years ago Brandon with BTE did an extensive and informative series about a - z on the subject. Maybe that post is somewhere in the archives.

If it can't be found, maye Brandon would repost the series.
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Old 08-07-2020, 10:05 AM   #4
Chris Hill
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Default Re: Physics of Racing Torque Converters

Russ, thanks for the reply.

Units are rpm and ft*lbs?

But there must be something about torque at an rpm.

Say you have an electric motor with a flat torque curve of 500 ft*lbs and you want stall of 6,000 rpm.

What additional info is needed?
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Old 08-07-2020, 11:21 AM   #5
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Default Re: Physics of Racing Torque Converters

That is the whole point of that formula . You have to develop a K factor that gives you the rpm you want with the torque you have at that rpm . In general you have different stators and different pumps that will give you a combo that matches the K factor desired . units are in rpm and ft.lbs.

Last edited by ss3011; 08-07-2020 at 11:23 AM. Reason: added info
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Old 08-07-2020, 01:01 PM   #6
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Default Re: Physics of Racing Torque Converters

If you can find a copy, "design of single stage, three element torque converters" by V. J. Jandasek explains torque converter function very well, including K factor. You might be able to get a copy from the SAE or it is in the third edition of "design practices, passenger car automatic transmissions", published by the SAE.

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Old 08-08-2020, 12:28 AM   #7
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Default Re: Physics of Racing Torque Converters

It might seem insignificant to most, but when you try to do math without using the correct units one will get incorrect answers.Torque is a twisting force and is typically expressed in lbs-ft while work is typically expressed in ft-lbs (energy). Yeah I know that seems to be nit picky but it makes a difference when you practice unit cancellation in the mathematics on the subject material.
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