stupid question
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
stupid question
This may sound stupid, but I've been a manual car guy all my life with absolutely no experience with autotransmission cars.
What happens when you put your one foot one the brake hard and rev the engine to say 5000 rpm the same time ?
What happens when you put your one foot one the brake hard and rev the engine to say 5000 rpm the same time ?
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Stock converter stall speed is around 2000 rpm (+/- 500 rpm), so that's all the higher it will rev...unless you've beefed-up the engine HP. Then, the stall speed wwould be higher. What you are doing is exactly why most 'stock' automatic cars will be a bit faster than their manual tranny counterparts...a very quick launch in the power band of the engine.
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Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
Might sound stupid, but if a converter will not allow an engine with the trans in drive to go over its stall speed, this means that it can apply more load on the engine than it makes it possible to rev higher.
This proves that my thinking is right and one can use a torque converter as a brake in a home made dyno.
That's all i needed to know.
Thanks
Yves
This proves that my thinking is right and one can use a torque converter as a brake in a home made dyno.
That's all i needed to know.
Thanks
Yves
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Stock converter stall speed is around 2000 rpm (+/- 500 rpm), so that's all the higher it will rev...unless you've beefed-up the engine HP. Then, the stall speed wwould be higher. What you are doing is exactly why most 'stock' automatic cars will be a bit faster than their manual tranny counterparts...a very quick launch in the power band of the engine.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
It has been a 'while' since I followed any stock car drag racing. But, most of the fastest cars were automatics (not by a dominating percentage, however). Besides 'massaging' the torque converter to get it up to the max. allowed for each engine set-up, the converter also provides some torque multiplication at take-off RPMs. That is an additional benefit over the manual boxes. I like to drive both; but at my age, an automatic is much more pleasant.