torque converters..

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Turbo6Smackdown

Well-Known Member
Joined
Dec 31, 2005
Messages
6,110
I hear this 'put a higher rpm stall converter in there' for a quicker spool... how. the transmission and its components dont spool turbos. exhaust gas does. im lost. do these higher stall converters let the rpms build up a little more or something?
also, how does a boost controller spool turbines faster. it may FEEL faster, but the elapsed time, from when you physically mash the throttle, to the time the boost comes on, cant be any quicker. it just lets it all come on at once doesnt it? exhaust gas velocity is exhaust gas velocity. a simple brass valve or two, cant make the engine rpms rise any quicker, thus making the exhaust gas come out quicker, spooling the turbo faster can it? im lost.
Im assuming these items AID in the turbo being able to do its job a little better, but not physically increase the rate in which it spins.
 
Well the boost control just aids in controling the boost of the trubo by changing what the turbo sees as boost. I believe it restricts the flow to the turbo to make it think the turbo boost pressure is actually less than what it is, therefor it could boost more before the wastegate opens up.

A stall convertor is used to transffer the rotating power of the engine via the crank to the transmission to get the wheels moving)via trans fluid in the convertor). It takes the place of a clutch (found in manuel transmissions) So at a giving "stall" speed the convertor will start to turn the transmission input shaft to get the car moving. Usually @ idle the crank does not spin the torque convertor fast enough to overcome the brake force (applied by you) to move the car via the transmission. Once you let off the brake, and hit the gas, the torque convertor can then move the car via the trans. If you get a higher stall convertor, say a 3K stall, the stall convertor has to spin higher before it can actually engauge the transmission (using tranny fluid inside)to move the car. If , for example, you have a convertor that wont "engage" the transmission untill 3K rpm before the car will move, well the the engine has to rev to 3K RPM's (thus the exhuast gases are now flowing faster than a engine at idle, also increasing turbo speed) now the turbo is beeing spooled up, the car isnt really moving (especially if your apllying the brakes) your building boost and the car will launch a lot harder and you will be in the sweet spot for the turbo. If you have a stock convertor, the car will start to move @ 1-2K RPM and the engine will take a bit longer to reach 3K rpm , and thus the turbo will take longer to spool and increase boost..... hope this helps!
 
I know it helped me and I already had a basic understanding of it all :cool:
 
so i was basically right then. its the 'slipping, untill it hits the turbos sweetspot' deal goin on then. none of those devices actually MAKE the turbo spool faster, they just HELP it get it going, and quicker. I see said the blind man.... then that makes sense, cuz my converter is really 'loose' then. when crusin at about 30-35, and i let off the gas for a second to let the rpms momentarily fall down a little, then slightly re-apply the gas again, (to get the rpms caught back up with the actual mph of the car) you can hear the rpms have to rise up a little, before the car gets movin again. i dont like that. I was wondering if there was anything wrong with my car :(

I was told that it had a 2800 stall converter in it. does that sound right guys? i was also told that the stock d5 converter, with the stock turbo and injectors is actually kinda good. was that correct info? anyone?
 
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