( US Patent No. 6,564,546 B2 )
The high performance and racing torque converters being produced today have to provide both a sufficient stall RPM and at the same time maintain a reasonably good coupling efficiency. In many situations the need to also change the stall rpm becomes necessary. Up until now, that required some tedious work and time for sending the converter back to the manufacturer. That's because all the mechanical components in the converter are set up to operate at one stall rpm and one coupling efficiency for each combination. In order to make any change, these components have to either be modified or replaced. Variable Stall Control uses a different approach to make the converter more versatile and efficient. This flexibility makes life easier for both the racer and converter manufacturer.
Variable Stall Control (VSC) is actually built into the valve body of the transmission. This innovation is now completely changing the approach to building racing torque converters; primarily because it reduces the compromise in trying to achieve both a high stall rpm and a high coupling efficiency at the same time. It's so unique and works so good, that it has been patented.
Since its inception, the automatic transmission has relied upon the torque converter as the means to couple an engine's power as well as multiply its torque. In operation, the torque multiplication occurs during the stall phase when a vehicle is being launched. As a vehicle starts to move, the stall phase diminishes and the coupling phase begins. The VSC is a new perfected method to optimize both a torque converter stall rpm and coupling efficiency. This translates into a better (60) foot and elapsed times, as well as optimum mile-per-hour, and over-all performance in terms of converter life.
Do you have a turbo-powered car? Is it difficult to get the right stall rpm for the desired boost level? If the converter does stall properly, are you burning it up because the high engine torque is forcing it to slip all the way down the track? How many converters have you burnt up already? (Converter overheating leads to Transmission failure).
Do you have a nitrous powered car? Would you like to run without the juice once in a while? But how can you get that tight converter loose enough to let your engine get into its powerband without changing to a higher stall converter? Would you just like to run a tighter converter? ( VSC )
Do you still have problems getting the right converter and stall for your combination? Are you tired of sending your converter back-and-forth to achieve the right stall?
Did you ever want to effectively launch your car at a different stall rpm due to varying track conditions? But how can your engine get into its power band without bogging? ( VSC )
Have you made some changes to the motor? Or is it getting a little tired or down on power due to weather conditions and you can't get the same stall out of your converter?
Do you have a high-powered street car? Are you using a converter that's great for launching but slipping away while driving around town, converting all that power to heat?
A "yes" to any of the above indicates the VSC is right for your combination. This system is currently available for use with the Powerglide, Turbo 400, and 4STB transmissions equipped with an FB trans-brake valvebody and front pump. It will provide an instant stall increase of 600 to 1000+rpm; depending upon the amount of engine torque at the preset stall rpm of the converter being used.
The torque converter has always been considered a "fixed" fine tuning element of a car's driveline. Now it's remotely "tunable" with the VSC system! For more details please contact:
FB Performance Transmissions at (631) 242-0008 in NY or (800) 769-1118.