Advertised Stall Is Not A Fixed RPM
Hughes Performance explains that advertised stall ratings are nominal. Actual stall changes with engine torque, vehicle weight, rear axle ratio, tire height and converter design. In other words, the same converter can behave differently behind two different engines or in two different trucks.
Match The Converter To The Powerband
The goal is not “the highest stall you can tolerate.” The goal is to let the engine reach useful torque without making normal driving, heat control or lockup behavior worse than the application requires.
| Published example | Converter guidance |
|---|---|
| Texas Speed L92 Truck Stage 1 — 216/228, .600/.600, 113 LSA | Factory-converter compatible. |
| L92 Truck Stage 2 — 220/232, .600/.600, 112 LSA | Texas Speed recommends 2800+ stall. |
| L92 Truck Stage 3 — 224/236, .600/.600, 112 LSA | Texas Speed recommends 3200+ stall. |
Those are vendor-specific recommendations, not universal rules, but they demonstrate the relationship: as the cam pushes useful power higher, the converter requirement generally rises too.
Information A Converter Builder Actually Needs
- Engine displacement and real torque characteristics.
- Cam specs and intended RPM range.
- Vehicle race/curb weight.
- Rear gear and actual tire height.
- Transmission type and lockup strategy.
- NA, nitrous, turbo or supercharged use.
Sources & Further Reading
These links are here so you can verify the numbers and go deeper into the original technical material.