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Size of Intake Piping

961 Views 8 Replies 6 Participants Last post by  TheBlade
Part of the Grassroots Motorsports article on the Protege/EscortGT caught my eye. According to David Avard, "most of the intakes sacrifice torque...besides the stock VAF is restrictive enough to limit anything you might do with intake piping."

My question then is whether there´d be any benefit to going with a slightly smaller diameter than stock for the intake pipe. Keeping the stock VAF, but a 1/4" less sized pipe might yield greater airflow speed, better filling of cylinders, etc. Don´t know if there´d be any measurable horsepower reduction at high rpms. Has anyone tried using a smaller diameter pipe in order to maximize torque over horsepower? Or anyone want to discuss the merits of such an effort?
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After everything I´ve done to my car I´ve come to the conclusion the more pressure I run...the more power I get :-D Sorry guess that doesn´t help anybody...but boost is fun.
actually the best thing to use is a MAP sensor. then all you need is a filter and that´s it. calculating manifold pressure will account for temperature, air density, all aspects of sensors for air flow/fuel calculation.

Problem is you need an ECU designed to use manifold absolute pressure....like a Haltech.
yeah, I lived with a guy that had a turbo´d civic. He ran like 2.5" IC piping. The piping was WAY too big, so he had horrible turbolag and in-efficient boost.

After seeing that happen to him, I chose to go for 2" piping. The 2" piping seems kinda big for 5psi or so, but I think it will be needed when I go for 12-15psi.
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