Miata Turbo Forum - Boost cars, acquire cats. - How much hp gain with +1mm valves?

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Halcyon

Jan 12, 2010 07:18 AM

How much hp gain with +1mm valves?

Anyone have before and after results?

JasonC SBB

Jan 12, 2010 11:45 AM

FWIW according to Rebello +1 on the intakes takes a lot of extra porting work to make em flow. +1 on the exhaust OTOH requires little extra work.

They claim something like +5% flow over stock size valves if the latter is ported. Porting by itself gains more.

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