Installation Notes:

• Warning: The "3/4 RACE" Twister series converters are NOT designed to be used with Nitrous Oxide or Trans-Brakes
• HAYS recommends an external transmission cooler for all Twister 3/4 Race Converters (A minimum size of 18,000 GVW or 15,000 BTU Rating.)
• Note: Stall ranges will vary depending on engine set-up, weight of vehicle, and gear ratio (Please see converter selector below for more info)

** ADVERTISED stall speeds are based off of a 3600 lb. car with 200 HP/275 ft.-lbs., 3.42 gear, and a 26 inch tire.**

With this in mind, to achieve a DESIRED or ACTUAL stall speed for your application, it may require a converter with a substantially different ADVERTISED stall speed.
Example: A Street Rod that weighs 2,000 lbs. with a DESIRED stall speed of 1800 RPM. The lighter weight of the vehicle reduces the stall of the torque converter. To achieve a DESIRED stall of 1800 RPM, you would need a converter with an ADVERTISED stall speed of 4200-5000 RPM.

• Weight: Like the example shows, a vehicle lighter than 3600lbs. will reduce the stall of a converter. A vehicle heavier than 3600 lbs. will increase the stall of a converter.
• HP/Torque: A vehicle with an engine producing more than 200HP/275 ft.-lbs. will increase the stall of a converter. A vehicle with an engine producing less than 200HP/275 ft.-lbs. will decrease the stall of a converter.
• Gear: A vehicle with a numerically higher (lower) rear gear will reduce the stall of a converter. A vehicle with a numerically lower (higher) rear gear will increase the stall of a converter.
• Tire Size: A vehicle with a tire shorter than 26” will raise (numerically) final drive gear ratio, and reduce the stall of a converter. A vehicle with a tire taller than 26” will lower (numerically) the final drive ratio, and increase the stall of a converter.
• Exhaust: Open headers will decrease the stall RPM of a converter when compared to a full exhaust system on the same vehicle.