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Old 07-23-2011, 07:15 PM   #1
Joe DeMarzo
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Question Weight and the converter

Does the weight of a car change the stall of the converter? For example if a converter stallls at 4800 in a 3400 lbs car and you remove 200lbs does it change or stay the same?
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Old 07-23-2011, 07:56 PM   #2
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Default Re: Weight and the converter

The stall of the converter has to do with the horsepower supplied by the engine to the converter and nothing to do with the weight of the car until the car is launched when the converter starts to do its work.
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Old 07-23-2011, 08:19 PM   #3
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Default Re: Weight and the converter

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Originally Posted by 63corvette View Post
The stall of the converter has to do with the horsepower supplied by the engine to the converter and nothing to do with the weight of the car until the car is launched when the converter starts to do its work.
My 2 Cents
Rick Cates
Yes, but even though the flash rpm would stay the same, once the car is moving the converter would "act" tighter in the lighter car.
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Old 07-23-2011, 08:33 PM   #4
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Default Re: Weight and the converter

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Yes, but even though the flash rpm would stay the same, once the car is moving the converter would "act" tighter in the lighter car.
Sho 'nuff!
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Old 07-23-2011, 09:07 PM   #5
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Default Re: Weight and the converter

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Originally Posted by billy nees View Post
yes, but even though the flash rpm would stay the same, once the car is moving the converter would "act" tighter in the lighter car.
x2
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Old 07-24-2011, 11:00 AM   #6
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Default Re: Weight and the converter

Billy, Well said!
It will also change the way it works if you change gear ratios. A deeper low gear will make it act like it is tighter.
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Old 07-25-2011, 04:10 PM   #7
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Default Re: Weight and the converter

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Originally Posted by Billy Nees View Post
Yes, but even though the flash rpm would stay the same, once the car is moving the converter would "act" tighter in the lighter car.
Is this because the weight of the car affects the 'force' the converter 'sees'? Or that if the car is heavier, the converter is 'forced' to work harder and will therefore be looser?
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Old 07-25-2011, 04:43 PM   #8
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Default Re: Weight and the converter

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Originally Posted by Todd Boyer View Post
Is this because the weight of the car affects the 'force' the converter 'sees'? Or that if the car is heavier, the converter is 'forced' to work harder and will therefore be looser?
The converter would be loaded for a slightly longer period of time in the heavier car. (200 lbs heavier, same car)
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Old 07-25-2011, 05:33 PM   #9
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Default Re: Weight and the converter

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Originally Posted by Todd Boyer View Post
Is this because the weight of the car affects the 'force' the converter 'sees'? Or that if the car is heavier, the converter is 'forced' to work harder and will therefore be looser?
If I understand what you're asking, the answer is > both.
A good running Powerglide car does so, in spite of having such a high 1st gear ratio, because the converter is forced to "work harder".

As another example pertaining to weight; A street and strip car with a high stall converter,cruising along on the freeway, comes to a hill or rise in the road.
The effect of the hill is that the car thinks it's "heavier" and the RPMs will rise, while maintaining the same MPH.
You've got to remember,unless it's got a lock up clutch it it, it is a fluid coupling
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Old 07-27-2011, 03:33 PM   #10
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Default Re: Weight and the converter

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Originally Posted by Mark Yacavone View Post
You've got to remember,unless it's got a lock up clutch it it, it is a fluid coupling
This is something that has always made me wonder. What are the actual physics involved to cause a converter's stall?

At least in our cars, the engine goes past the torque peak then settles down at a lower torque value for flash/stall. And keeping everything equal with gearing and weight, in good air it will flash at a higher rpm with increased torque.
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