Can you explain stall converters to me? how they work and how they feel when driving the car? do you have to drive the car differently?
Stall converters, are a replacement for your standard torque coverter on an Auto.
In an Auto with standard converter, when you take off from standstill, the engine is able to rev slightly higher or slip, (maybe 1500 revs), to allow the engine to develop a little more power/torque that what is available at idle. (otherwise the car would struggle to move).
In a performance engine, the power is shifted up the rev range, so the the standard amount of slip in the converter is not enough to reach the into the engines power/torque area.
The engine needs to be able to rev higher, and that is what the stall converter does. You must match your converter to your engine characteristics, ie a 2000 rev, 3000 rev etc. depending on where on the rev range you start to make power/torque.
The result of this is when you accelerate hard off the line, you dont have to wait to gather enough speed to get the engine into its power range. Its there right from takeoff.
One other feature of stall converters is that on a really high performance engine, it allows a higher idle rev without trying to take off down the road. (fast)
In terms of driving, ive found that unless you have a diff ratio like 3.5 or more, when driving in 50-80 speeds, when you increase throttle slightly, the engine tends to rev up to the stall speed which gets quite annoying. But again it depends on what sort of driving you want to do, and how much power you want.
I don't know how clear this is. A lot harder putting it into words than I thought.