Results of torque converter research

[Hypsi87]

I know enough about this to be dangerous. It appears that stall and slip are two different things (I kind of have a hard time understanding this). There are efficient and inefficient ways to to make a higher stall convertor. It appears that the larger diameter the convertor the more inefficient they have to make it to get the stall. The convertor is a viscus coupler. Its trying to transfer power though a non solid connection. The fins of one side of the convertor are acting on the tranny fluid and that fluid then tries to "grab"/ force the other fins to move. Now it pretty much is easy to see that fin angles are going to affect how hard the one side pushes on the fluid and also how easily the fluid can transfer the power to the other set. Now from that you can see that there are efficient and inefficient fin angles. Now you got to start addressing the size of the convertor and the fins. Basically since where not solidly transfering the power we are going through (for lack of better words) some kind of squishy / flexing / twisting / slipping kind of deal. Well if your trying to pass lets say 500 hp through this deal it only makes since that a larger one will do a better job because its physically bigger and can handle the power better. Maybe like tires in mud. Tires with small tread blocks can grab mud but it cant grab enough of it to transfer much power. Now you take a nice set of big old mudder tires with the bigger tread block, its going to be grabbing much more mud and therefore do a much better job of transfering the power. This is where the big convertors down fall comes. It grabs to good so you got to put crappy angles on the fins to get the stall speed up. This same crappy fin angles makes the convertor less efficient and makes it slip. This slipping is a total waste of power. Its converted to heat which takes out your tranny, and slows your car down. Yes it allowed you to build boost quicker but then bit you in the ass the whole rest of the track. Now your smaller diameter convertor can use better fin angles more more efficient power x-fer, but they will still stall because like the smaller tires they can't grab enough. This is the better of the two senerios. You can start running into problems if the convertor is too small because even with good fin angles it just its just too small to try to x-fer that much power through it........

I have too much time on my hands

Andy

[4onFloor]

i didn't see anything about lock up converters in there

[89IROC&RS]

lol, dude, you do have a female in your life right??? i suggest, especially seeing as its valintines day, you make better use of your time lol. and yeah with lockup, you can build a high slippage, large diameter converter that will shit and git out of the hole, and then lock up at freeway cruizin. also, ill have to go back to my magazines, but i read something about a manual valvebody modification that alters the trans fluid pressure to alter the stall speed of a converter for launch, allowing it to stall higher, then drop the stall back down for cruizin. not fully up to speed on it, but very interesting none the less.

[Hypsi87]

Originally Posted by 89IROC&RS

lol, dude, you do have a female in your life right??? i suggest, especially seeing as its valintines day, you make better use of your time lol. and yeah with lockup, you can build a high slippage, large diameter converter that will shit and git out of the hole, and then lock up at freeway cruizin. also, ill have to go back to my magazines, but i read something about a manual valvebody modification that alters the trans fluid pressure to alter the stall speed of a converter for launch, allowing it to stall higher, then drop the stall back down for cruizin. not fully up to speed on it, but very interesting none the less.

To go form a high stall 3500 or more to a stright lockup is crazy. converter will explode. I have seen this happen. Anyway I was doing research on a turbo 400/350 trans. 200/700-r4 is no good for serouis power. the TH transmissions won't lockup. As far as the valvetrain modifications. You are talking about is a switchpich transmissions. My uncle has one. 4000 RPM launch stall then when it shifts into 2nd it locks down to 1000RPM stall.

Oh and no womon for me. I think the Buick repels them. I dono maybe it takes a camaro

[89IROC&RS]

awww comon hyps, the GN is buicks camaro if you really think about it, maybe even its vette. aside from the fact that it was affordable