Hi welcome to monster transmission your With Curt here in Curt's corner we've got
a lot of questions about stall speed stall speed what does it mean how does
it work so I'll give you a quick overview on exactly what stall speed is
and what it means to your application so in a factory vehicle. Whether it's Ford GM
dodge or even other vehicles when you have an automatic transmission and that
the engines idling let's say it's idling at a thousand rpms for example when you
put it into gear to drive whether it's reverse or drive the RPMs will go down
but the engine will not shut off will not stall out like on a standard
transmission if you were to release the clutch all the way without accelerating
and raising the RPMs the intial will just leap forward and stall out
well on an automatic to prevent that from happening all the energy is spooled into
the converter so the engine will reduce rpm about two to three hundred rpm so
your idle will jump down anywhere between 800 to 600 rpms
but it will not stall out and what is happening is all that energy or the
stall speed the converter has now kicked in is spooling that energy and so the
stall of the converter is around anywhere we'll take it at least 800 rpms
of your engine down so for example you want a a 2,000 stall converter a lot of
people assume that you have to raise the RPMs of the vehicle up to 2,000 before
the transmission engages and that's inaccurate the correct way to calibrate
your stall speed if you had a factory cam factory engine and you want what a
2,000 stall and the factory will say 1600 so it would just take 400 more rpm
to actually engage the actual converter engage the drivetrain of a transmission
so it is not exactly -to the RPM spec because it's based on a lot of factors
and the factors are also the horsepower and torque of your engine the size the
lift and duration of your cam your tire size and your rear rear end
gear ratio so all those play factors on the actual
stall speed of the converter and that's why they offer a range of stall speeds
because of all those variables so it's important when you give us the
information on your engine and your cam and your rear end those are critical
items we need to calibrate or dial in the converter to the correct stall speed
that you need for your particular application so this happens to be a
Dodge converter here so actually it's a very low stall something around 1300
stall because it's going on the diesel application it's a more beefed up unit
but when you get inside the unit you notice there's an array of turbines so
the angles of the fins will determine part of the stall rate as well as the
stator itself the stator fin angle the angle of these fins will also determine
the stall rate so and also the diameter of the converter you know the
circumference of the converter also has a factor on the spooling or the ratio of
determining your stall speed so all these play factors in determining your
stall speed so the stall of a converter is relative or directly tied to the
cubic in size of your motor the horsepower rating your cam so we need to
know the gross lift and duration that the valves are held open so we need lift
and duration of your cam as well as your rear-end gear ratio and your tire size
all those are important factors to dial in the stall speed for your converter so
stall speed basically spools the energy of your of the transmitter of your motor
to the torque converter before it releases it to the transmission so
that's how stall speeds work and how that's important on the performance of
your vehicle you have any further technical questions you see us at
monster or go to our website or call our number to ask for a tech and it's
800 708 0087
Talk to you then