EFR 6258 315whp, 251wtq @ 12psi
#14
The work I did on the intake ports was smooth the surfaces and removed the casting flash and remove the ridges from behind the valve seats. The exhaust ports were smoothed and the ridges behind the valve seats were also removed like the intake ports and they were polished. The combustion chambers were smoothed and polished and I removed the machining ridges from around the valve seats. Pics are in my build thread.
https://www.miataforumz.com/showpost...7&postcount=79
https://www.miataforumz.com/showpost...578&postcount=
https://www.miataforumz.com/showpost...7&postcount=79
https://www.miataforumz.com/showpost...578&postcount=
#16
Allegedly this turbo spools like a 2554 and is capable of 400+ rwhp.
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