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4,731 Posts
turbo's kick ass... end of story... torque, topend all around.
once you select the right turbo for your situation, spool up isnt much of a problem
your a/r on the exhaust side is really the key... in a typical T4 open, and for a 4.6 engine, I would recommend a .81 in a stock-ish motor and a .96 in a "hotter" engine capable of a wide rpm range.
also, running a larger compressor than is needed (such as my case, NO reason I need a 78mm turbo on a 293cui motor) creates the same power at lower boost level.. reason? your flowing more air!! so, with that said, you can deduce that for a small motor, a small exhaust housing (not to small as this will be detrimental to TOPEND).
once you select the right turbo for your situation, spool up isnt much of a problem
your a/r on the exhaust side is really the key... in a typical T4 open, and for a 4.6 engine, I would recommend a .81 in a stock-ish motor and a .96 in a "hotter" engine capable of a wide rpm range.
also, running a larger compressor than is needed (such as my case, NO reason I need a 78mm turbo on a 293cui motor) creates the same power at lower boost level.. reason? your flowing more air!! so, with that said, you can deduce that for a small motor, a small exhaust housing (not to small as this will be detrimental to TOPEND).