"What stall speed do I need?" is the most common question we get — and the honest answer is that stall speed is never chosen in isolation. It's the result of your whole combination working together.
What stall speed actually means
Stall speed is the engine RPM at which your torque converter begins to efficiently transfer power to the transmission. Below that RPM the converter "slips" on purpose, letting the engine rev up; at stall it starts to couple and put the power to the ground. A higher-stall converter lets your engine climb further into its powerband before the car takes off.
The five things that decide your stall
- Camshaft & powerband — a bigger cam makes power higher in the RPM range, so you generally need more stall to get the engine into that range off the line.
- Engine power and torque — how hard the engine pulls at low RPM.
- Vehicle weight — heavier cars want the converter to couple sooner to get moving.
- Rear gear ratio — steeper (numerically higher) gears effectively multiply torque and change the stall you need.
- Tire height — taller tires act like taller gearing and load the converter differently.
Rough starting points by use
These are general ranges to set expectations — your exact number depends on the combination above:
- Daily/street, mild cam: roughly stock to ~2,400 RPM
- Street & strip, healthy cam: ~2,800–3,200 RPM
- Serious bracket/heads-up: 3,500 RPM and up
- Towing: keep it tight to control heat and keep the converter coupled
Too much stall on the street means a loose, revvy feel, worse mileage and more heat. Too little for a big cam means the engine bogs below its powerband. The goal is to match the converter to where your engine actually makes power.