i didn't build this converter for his application i built it for a friends car and they decided it was too much for their daily driver so i built them a 12inch converter instead .
i could spend hours explaining torque converters to you and still most would not understand what i am saying without seeing it so i'll start and finish it up later.
the parts of the converter.
pump or impeller pictured here on the right.
and the stator is on the left on top of the turbine.
these components control stall and efficiency this particular model is built for the 4r70w and aode transmissions.
the pump has a few factors controlling stall and efficiency
the angle of it's blades (this is a very high stall unit) control stall alot .
if the blades are straight stall will be less and if they are pitched the opposite direction they will be even lower.
also it's diameter and depth control stall this is a deep converter which will become very efficient (90%)at high rpm but is not very efficient at low rpm.
the stator is the aluminum piece you see it has a sprag inside of it that turns freely one way and not at all the other.
when the sprag is locked the converter is on high stall.
when it is unlocked the converter is as efficient as it can be.
the fin angle of the stator greatly increases stall as well as the distance the stator is from the turbine and impeller further away from the impeller will decrease stall and further away from the turbine will increase stall.
the turbine is the other set of fins you see it drives the input shaft of the transmission.
the depth of the turbine also helps control stall and efficiency as well as brazing of the components as you see here improves efficiency.
the distance the turbine and impeller are away from each other greatly controls stall and efficiency
normal clearance is .100thousandths or 1/10th of an inch
converters can be built as close as about .060 thousandths but they have to be very precision parts and usually the brazing process time and use and even factory standards don't much allow for these clearances the easy way to make a converter stall is to add clearance between the halfs at 3/10ths of an inch a 1500 stall 90% efficient converter will become a 2500 stall 75% efficient converter compared to the 1/10th of an inch normal clearance
however making stall this way has the most dramatic influence on efficiency so is not desirable the best ways to increase stall and to machine the stator to allow more flows but redirect it away from the turbine or just use a stator that is already the way you want it
and changing the angle of the pump or impeller fins is a good way to increase or decrease stall that is the most common thing to do to get a mild change the stator generally makes a major change
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