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The new JMM-3000 series Performance Stall Converter.
Launching a Falcon fitted with a trusty 4 speed BTR automatic transmission off the line has always been a daunting task. The high ratio first gear in the BTR 4 speeds never gave Ford fans a chance against the low ratio thunder of the Holden TH700. The task of launching a falcon off the line has been left up to clumsy diff ratio changes, which is great for the drag strip but only leads to huge fuel consumption on the Street. Matched with the cost of re-calibrating the speedo and altering speed limiters to get your vehicle running correctly, only makes diff ratio changes a very expensive and stressful task. After two years of research and development, Jim Mock Motorsport has come up with the answer. The new JMM 3000 Progressive Performance Stall Converter for 4 speed BTR transmissions will transform the Falcon owner’s high ratio BTR 4 speed slug into a line munching machine. JMM designed the converter to aggressively stall to the desired lockup speed and launch. Quite often tyre smoking is a result of heavy throttle application, but we wanted to keep the street ability of the auto as well, so light throttle driving is still as per normal and the overdrive lockup plate takes over while cruising or on the highway, keeping fuel economy to the max. Matched with a JMM-DEV5 Engine Performance Kit and a 3.45 ratio limit slip diff, the JMM 3000 Series Converter will flash to 3100 rpm instantly. If fitted behind a stock engine, the stall speed of up to 2500 rpm is normal. In Basic, the more power you make the higher it will stall. If used in conjunction with a turbocharged setup stall speeds of well over 3000 rpm are an easy task. Jim Mock Motorsport state “The main aim of the converter is to keep a sensible diff ratio and be able to launch the car hard off the line. At the same time, having a torque converter that actually works and doesn’t continuously slip once past the stall speed was a big task. Some modified converters will stall and then slip their way thru the rev range basically chewing the fuel and loosing power. We also modify the lockup in the converter to ensure good economy and drive ability”. We now have many of our Customers using the JMM 3000 Stall for casual Drag Racing in their Street-Strip vehicles, with improvements in ET of around half a second being reported. “Next thing to do is fit the stall converter with a lower diff ratio, a setup suitable for full time racers, and hold on”. |
Updated:
18/05/07