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07-26-2001, 04:04 AM | #1 |
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How do torque converters work?
I know this is a great mod for automatic cars and I always suggest it to people to have it done, but im not sure how they work. Could someone explain how they transfer torque and why higher stall speeds are better for higher powered cars. Also what "locks up" in them?
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07-26-2001, 09:31 AM | #2 |
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check out www.howstuffworks.com and do a search. It's a really good site for stuff like that.
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07-26-2001, 10:51 AM | #3 |
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they're not a "mod". They are the clutches in an auto. Basically, they use fuild, which heats up when the plates inside (one attached to flywheel, one to tranny) spin at different speeds. The hotter the fluid gets, the thicker it gets, which makes the plates spin at the same speed.
but yeah, check out the howstuffworks web page. |
07-26-2001, 05:34 PM | #4 |
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i meant "mod" only as to upgrading the stock one. not something you would just add because it doesnt have it...
thanks for the site, ill check it out later tonight |
07-26-2001, 10:12 PM | #5 | |
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Quote:
Most fluids, such as automatic transmission fluid, tend to become more viscous (easier flowing) the hotter they become. The wisdom of utilizing a torque converter with a HIGH stall rate is to assure that the engine is in its correct 'powerband' when the car starts moving forward. Most typical Automatic transmission vehicles suffer from a brief delay period when first starting out from a dead stop. Many amatuer 'Drag Racers' will resort to 'brake standing' (nailing both the brakes and the throttle) before starting there runs in an effort to thward this tendancy. Installing a High stall speed torque convert also helps in this regard. |
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07-26-2001, 10:49 PM | #6 |
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Jonathan: I would say we're both correct. The torque converter works in the same exact way the viscous center diff. works, just with a different fluid, and different number of plates.
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07-26-2001, 11:17 PM | #7 |
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Viscosity
Most fluids become less viscous (flow easier) as they heat, although some behave in the opposite fashion. The AWD may also work off of the fact that viscosities can change as the fluid is pumped, irregardless of heat. A great example is blood; as long as blood is being pumped, it flows fairly easy. When blood is allowed to puddle though, the viscosity increases because it is not being pumped. And some plastics/polymoers thicken as they are circulated, which may be similar to something in a torque converter/AWD linkage. I know little about cars/car parts, I just remember some of this from a fluid mechanics course.
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07-26-2001, 11:54 PM | #8 |
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Corn-Picker -
Good point. Yes the Viscous coupling employed in Subaru's AWD set up does indead get thicker as it gets hotter. When the front and rear axles are turning at approximatly the same speed the coupling fluid is cool and flows fairly eaisily, allowing a certain amount of minor slippage (such as when taking a tight corner, for instance), however when one set of wheels begins to loose traction, very quickly this causes the fluid to heat up, and not allow much slipage, fourcing both axles to turn at the same speed. |
07-27-2001, 12:16 PM | #9 |
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Someone suggested www.protorque.com. Once I have all the data needed to have one made I will do just that. If we were able to bring the RPM's up a little higher (instead of brake standing) the auto's would jump off the line pretty well. This is a common upgrade for the Aus/Europe WRX gents. They also run one to two tranny coolers. There is/was a forum out there for Auto WRX's. It was very very informative.
Shawn |
07-28-2001, 11:14 AM | #10 |
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Hello Moderator, please pardon my impudance for not agreeing with you. Torque Convertors consist of an Impellor, a Stator, and a Turbine as their major parts. There are no friction plates in a Torque Convertor.
Subaru also uses a computer controlled Lock-up mechanism in the Torque Convertor. Last edited by SubyTechMaster; 07-28-2001 at 11:17 AM. |
07-28-2001, 11:37 AM | #11 |
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hey, I don't claim to know it all
that was just the understanding I had about them...I was wrong. |
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