Ecoboost water pump
For some reason Mazda MZR and Ford Duratec engines uses an archaic stamped steel impeller in their water pumps.
The later Ford Ecoboost engines in the Mustang 2.3 has a compatible pump with a different design and material.
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I’m no fluid dynamicist.., but that sleek curved vane design and the fully closed back plate hopefully will increase flow rate and efficiency.
Initial testing on the street in ~ 20C ambient seems to indicate the car runs cooler. But as with any performance part the real test is on the track.
And.. it’s also dirt cheap at $29 ( GATES 41211, Rock Auto) at the time of writing.
My new best friend gave me a primer on how coolant flow rate will affect cooling:
Science!
UPDATE: 2026.10.22: After running this pump both on the old 2.5l and the new L3-VDT/L5 block/head combo I have observed that during normal driving and road tuning the coolant temps are ~10C lower than before… Thermostat is the same.
This is actually a problem now when ambient temps drops below 10C as the CLT during cruise drops below 80C and I had to block off the oil cooler and hood vent.
Not tested on the track yet due to the L5 letting go end of 2025 season.
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