The Correct practice of a stall converter for racing is to sheet the vehivle and grasp the brake pedal just prior to launching, and flash the engine to the stall before releasing the brake. Do not flash the stall in the first staging lights. As you set of the first set of lights, ease the RPM up close to flash, bump-brake the car into the final staged lights, then immediately flash and hold.
Other earnest considerations are the grind of the camshaft as to the lift, continuance and efficacious compass and the type of induction if accustomed aspiration or forced induction. The forced induction comes into play individual whether it is turbo charged as opposed to super charged considering of the delay inherent in the turbo.
About Stall Converters
A general stall converter has a stall, depending on vehicle, from Nine hundred to 1,200 RPM. As the stall velocity increases, the lockup increases, nevertheless with ordinary driving the vehicle Testament accelerate with mini load quite usually as elongated as the stall does not exceed 3,000. When max potential is called for, the stall Testament light to the stall precipitation before lockup occurs. For instance, provided a vehicle is doing Thirty mph at 1,500 RPM in moment gear, when floored, the RPM Testament illumination to 3,000 before blastoff to pull adamantine. The Advantages and disadvantages to this are primary considerations. When the stall flashes, it Testament hurl the engine into the efficacy band and pull still harder than a conventional converter. The con is that, with the inventory converter, top quickness in moment may be Fifty mph at 5,500 RPM, and with the stall converter it Testament be enclosing 7,200 at the corresponding rush. The shift points Testament hold to be considered as to precipitation to stay within RPM limits.
A stall converter is a necessity in racing to receive to max torque as breakneck as likely. For hauling, such as getting a ponderous boat elsewhere of the imbue, a stall of 2,500 max is recommended. Anything higher would assemble driving problems while hauling, and Testament drown the fuel economy. Don't forget that going down the course every period the foot is lifted off the Gauze, or when the vehicle is cruising and a mini augmentation in celerity is desired, the RPM Testament leap to 2,500. In this circumstances, before it Testament accelerate and when the precipitation is reached, the RPM Testament Blop lower while cruising. It is nearly comparable the transmission is slipping until the stall is reached.
Introduction
There are many considerations for determining the equitable stall celerity for a converter. An aftermarket stall converter is used for good two things--towing and racing. The most important considerations are the weight of the vehicle, the gearing, the amount of the engine, and the influence and torque available at a decided RPM. Flashing early heats up the converter and the transmission fluid if held too long.Stall Converter Combinations
There is a lot of technical jargon involved, but for the sake of getting to the point, here are some professional suggestions.
A vehicle weighing around 2,800 lbs. with a highway gear of no lower than 2.70 and a 4-speed overdrive that does around 2,000 RPM at Sixty with no more than One hundred eighty bhp, uses a 2,500 RPM stall converter.
The same situation as above, but with a modified engine with Two hundred forty bhp or better and an RPM limit of 7,500, uses a 3,500 stall to get into the preferred RPM band quickly. Use a wider, stickier tire.
A vehicle weighing 3,600 to 3,800 lbs. with a highway gear and an overdrive and Two hundred forty to Three hundred fifty bhp and Three hundred foot-pounds of torque uses a 3,500 stall. This will produce the best ET for the hp rating.
Same weight class, lower gear such as 3.73 to 4.11, horsepower rating of Three hundred seventy five to Four hundred fifty with Four hundred twenty plus torque rating, uses a 3,000 street and strip or 3,800 strip stall.
Same weight, low gear 3.73 to 4.11, horsepower rating Five hundred to Six hundred eighty five with Five hundred fifty plus torque, uses a 2,500 to 2,800 stall. This will give a much better controllable Sixty foot time without just spinning the tires with this much torque. With the right rubber, this can give a 1.2 or better Sixty foot.
A 3,000 lbs. car with a modified suspension (4-link rear with 4.11 to 4.56 or lower gear), a modified 200R transmission and a modified engine with overhead cams, or using stud girdles on a conventional cam with a large turbo putting out in excess of Eight hundred fifty horsepower and about the same in torque, uses a 4,000 to 4,500 stall. For a super charger, use 1,500 to 2,200 stall.
