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Message: [QUOTE="Mark Kovalsky, post: 340668, member: 1654"] Stall speed is the maximum engine speed at full power with the truck not moving. If you try this on your truck, I'm not responsible if you break it! With the brake pedal pushed as hard as you can, trans in drive, mash the go pedal to the floor. The maximum engine speed is the stall speed for that torque converter. If you do this for more than 5 seconds I can promise you it will get expen$ive really fast. In many people's opinion, including mine, the factory diesel torque converters have too high of a stall speed. Stall speed ideally should be close to the RPM where the engine makes peak torque. The 7.3L makes peak torque at 1600 RPM, but the converter stalls around 2000-2100 RPM. Why did Ford do that? When upper management drove the early prototypes they liked the way a higher stall speed drove. It doesn't make sense to me, don't try to understand it yourself, we're professionals! :clapping: Lower stall will also produce better fuel economy. The converter has less slip whenever it's unlocked (except when stopped, where it's the same) so there is less heat generated in the torque converter, and the engine runs slower. Both use less fuel. [/QUOTE]

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