if I tell a company I want a 3600 stall converter for my H/C car that makes 400rwtq and the next year I put a supercharger on the car making 550rwtq, will my stall still stall at 3600? Or will it be more like a 3800 ? Or 4000?

 

How does a Torque-Converter affect a Torque-Converter...

Really???

 

wtf are you talking about? Learn how to read before you come into someone's thread making stupid *** comments.

 

Well you changed the Thread Title...

Now it says: How does Torque affect Torque-Converter size.

It does not.

The size of the Torque-Converter can not be changed by the Engine Torque production.
...Unless the Engine produces enough Torque that the Centrifugal Forces rip-apart the the Torque-Converter.

 

Happy now?

 

The title never said "how does torque converter affect torque converter" like you said.
It said " how does TQ, aka Torque, (engine torque) affect the stall converter and I added the word "size" to the title. Maybe I should have wrote stall speed RPM.
anyways...

so just another example because the guy at FTI is disagreeing with what your saying.
If you got a 3600 stall behind your little 346 and you drop in a 427 stroker....your saying it will still stall at 3600rpm?

thanks

 

First, your original title IIRC was "How does TC affect stall", which made no sense, but I did understand your question in the text of the post.
Second, don't try to head-butt a highly respected member of this forum, who was designing torque converters and transmissions for GM before some other members here were even born. And you completely missed his joke about "size" being the physical diameter of the converter and not the stall speed. (Granted when someone says they have "a big cam", they don't mean the diameter of the cam is bigger.)
Enough of that!

Despite my limited knowledge of converters and how stall speed is related to supercharging, I'm going to stick my neck out in order to move this thread and your question in the right direction.
The purpose of a higher stall is to keep the engine operating in its best torque range and not be lugging at low RPM under WOT.
A supercharger (and especially a turbocharger) expands the high torque range of the engine; therefore (in my limited knowledge), I would expect that a lower stall speed converter would be best with a supercharged and especially turbocharged engine.
This is similar to how supercharged and turbocharged engines often work better with "smaller" <grin> cams.

I'm happy to be corrected on all this in the interest of creating a useful thread.

 

It is my under standing that if you change to an engine that has more torque than the previous engine you will get a higher stall speed from the same converter.

 

I am just going to say, Call FTI Performance and ask them all the questions that need be.

I really feel that there is an ever increasing difference between a TC from a Company like FTI...
that is up to date with TC technology, and can build a custom unit for an individuals needs.

-VS-

An inexpensive, out dated, off the shelf, stock diameter TC from a place like B&M.

I say all of this because the behavior of modern TCs is often different from what people have experienced with older, cheap TCs.
The little amount of discussion about TC technology that I have had with Neal-Chance (and even Dalton @FTI)...
Tells me that many assumptions as to what a TC might do or not do with a certain change... are just wrong.
The technology today is different and really impressive!!!

 

Don't get size(physical diameter) of a converter confused with stall speed(RPM in which conv holds the engine at given a certain environment/scenario).

The short answer is to your question is yes it affects stall speed. If you take a converter that stalls 3000 behind a 400hp engine and put it behind a 600hp engine, it's going to stall higher.

This is all of course speaking on "true stall" not foot brake stall or flash stall where other variables are introduced.

-Dalton