Throttle Body advice

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Oct 30, 2019 | 08:28 AM

4wheelfurry

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Joined: Jul 2006

Posts: 209

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From: Deep South Louisiana

Throttle Body advice

So I'm doing a Navi dohc 5.4 swap into my old F7 and will be running the coyote Boss 302 intake. My issue is the Navi TB is a oval twin blade 57mm (ea) for a 114mm total TB. The Boss intke runs a round TB so I will be swapping to a round TB but I don't know which size to run... The internals are stock, headers and the intake will be my only mods, the PCM is flashed to run standalone and adjustments were made for the headers and a cooler thermostat. So what I want is to keep my throttle response snappy but also make my WOT perform as good as the twin blade all while playing nice with the PCM (good drivability)... Any recommendations? 70.. 75.. 80.. 85.. or 90mm..

Oct 30, 2019 | 01:52 PM

xlt4wd90

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Joined: Sep 2003

Posts: 7,013

Likes: 205

From: SoCal

Remember that the area goes up with the square of the diameter, so two round 57mm openings have the same area as a single round opening of about 80mm (not 114mm).