Drag Strip Stall Basics: Diameter and Fluid Fill for Launch Grip

Match converter diameter and fluid volume to target stall for consistent drag strip launches using ATI capacity data.

Updated 2026-09-22

Drag strip launches live or die by stall speed. Converter diameter sets the baseline stall range while fluid fill fine-tunes the final number before the green light.

ATI charts list exact fluid volumes by diameter: 13-inch units take 5 quarts, 12-inch 4 quarts, 11-inch 3.5 quarts, and 10-inch 3 quarts. Always fill a fresh converter before install.

Smaller diameters raise stall for quicker spool on light cars. Larger diameters lower stall for heavy chassis or high-torque combos that need more lock-up under the stripe.

Match the transmission first. TH400 with stock pan holds 6 quarts while Powerglide holds 4; add converter volume and verify total on the dipstick after the first heat cycle.

Deep aftermarket pans increase capacity. Recheck level hot, engine running, in park, then log 60-foot times to confirm the stall target is hitting the powerband.

Further reading: https://atiracing.com/tech/

Topics: drag racing · torque converter · stall speed · converter diameter · fluid capacity · Powerglide · TH400

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