Less Parasitic Loss

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Old May 31, 2009 | 10:23 PM
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Less Parasitic Loss

How would you go about building a 4R70W transmission so it has less parasitic loss than a stock one?
 
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Old Jun 2, 2009 | 10:52 AM
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Guess no one knows the answer to this one...
 
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Old Jun 2, 2009 | 11:29 AM
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I know, but I wouldn't advise it. You end up with a much weaker unit.

Darrin
 
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Old Jun 2, 2009 | 12:08 PM
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Just advise it. I'm probably not going to do it, but give me something.
 
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Old Jun 2, 2009 | 12:22 PM
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First of all I have to ask why...

Darrin
 
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Old Jun 2, 2009 | 12:46 PM
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Curiosity?
 
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Old Jun 2, 2009 | 12:49 PM
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If there were a valid circumstance I might be able to provide a somewhat reasonable means to achieve a desired result. Curiosity gives me no parameters within which to work other than to say that it will kill a transmission even more easily than a cat.

Darrin
 
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Old Jun 2, 2009 | 02:16 PM
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Ok if you really want to know... I'm currently in the process of building a high powered 4.6 engine and want to build the transmission so it has less power loss. It was supposed to be a secret but you just blew it out of the water!
 
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Old Jun 2, 2009 | 02:30 PM
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LOL

The thing is that you wouldn't ever want to build one of these transmissions for less parasitic loss for that purpose. The only time you would ever want to do what it woudl take to do that would be on a very low powered setup for fuel economy purposes only. And then the results would be about nil.

For a high power setup you want a build that will get your power to the ground without wasting it in heat from slippage anywhere. The above transmission could never do that because you would have raped out all of it's capability to.

And, in all honesty, a transmission to handle higher power is likely going to have more parasitic drag from all the extra clutches.

Darrin
 
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Old Jun 2, 2009 | 02:35 PM
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Oh, well now I know. Transmissions have always been a mystery to me, and I've always left them to the professionals. Guess this is one more thing I can erase from the "to-do-list".
 
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Old Jun 2, 2009 | 03:04 PM
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Jmod it, less restrictions means the oil pump is happier, and will last longer. Also with the oil pump having less resistance, it wont rob as much power from the input shaft.

Another food for thought is higher volume (less restriction) will mean stronger holding power applied to the clutches.
 
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Old Jun 2, 2009 | 03:25 PM
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Tell me more about this "Jmod".
 
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Old Jun 5, 2009 | 05:34 PM
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Originally Posted by 4.6 Punisher
Tell me more about this "Jmod".
Item 3# on the list.

http://www.tccoa.com/articles/tranny/index.html#
 
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Old Jun 9, 2009 | 08:29 AM
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Originally Posted by Patman03SprCrw
Jmod it, less restrictions means the oil pump is happier, and will last longer. Also with the oil pump having less resistance, it wont rob as much power from the input shaft.

Another food for thought is higher volume (less restriction) will mean stronger holding power applied to the clutches.
A j-mod isn't going to provide any less parasitic loss. It will definitely help the trans live longer though. But, you can't do one on a lot of the trucks because of the differences in internal springs and the plate itself. Jerry even says this on page 12 of his 'thesis'. He clearly says to use a main control (valve body) from a car. The reasons for this are as I just explained and the setup he gave for a j-mod are not designed for the truck valve body.

Be careful with that. If you mess up the plate you cannot buy a new one without getting the whole rest of the valve body to go with it and those are over $300 from Ford.

Darrin
 
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Old Jun 9, 2009 | 11:08 AM
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Wow, that looks pretty daunting. Maybe I should leave this to the performance shop down the road.
 
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