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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Tune plus downpipes, worth it??
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<blockquote data-quote="FORZDA 1" data-source="post: 1290925" data-attributes="member: 26637"><p>If referencing the cat then, in pure mathematics, yes. But in reality no, because the OEM turbo isn't moving enough air mass to result in any "restriction" to effect a reduction in the mass flow.</p><p></p><p>If we were to blow enough air through the cats/pipe(s) to produce a measurable reduction in the "air mass" going in vs the "air mass" coming out then there would be a true restriction. Otherwise it's just someone looking at shit on their desk...</p><p></p><p>The killer of exhaust "flow" is the turbulence within the pipe that forces the air mass to turn tight (90 deg)corners right near the peak mass flow. That is why the pipe shape right out of the turbine is the most critical to maintain the mass flow rate. If the OEM down pipe wasn't straight through to the cat and fairly straight out of the cat, then we would have issues.</p><p></p><p>If designing a "race" pipe then short and straight is the "best" where the diameter isn't as critical unless exaggeratedly smaller than the turbine outlet. 2.5" vs 3" isn't a big deal on the STOCK size turbine.</p></blockquote><p></p>
[QUOTE="FORZDA 1, post: 1290925, member: 26637"] If referencing the cat then, in pure mathematics, yes. But in reality no, because the OEM turbo isn't moving enough air mass to result in any "restriction" to effect a reduction in the mass flow. If we were to blow enough air through the cats/pipe(s) to produce a measurable reduction in the "air mass" going in vs the "air mass" coming out then there would be a true restriction. Otherwise it's just someone looking at shit on their desk... The killer of exhaust "flow" is the turbulence within the pipe that forces the air mass to turn tight (90 deg)corners right near the peak mass flow. That is why the pipe shape right out of the turbine is the most critical to maintain the mass flow rate. If the OEM down pipe wasn't straight through to the cat and fairly straight out of the cat, then we would have issues. If designing a "race" pipe then short and straight is the "best" where the diameter isn't as critical unless exaggeratedly smaller than the turbine outlet. 2.5" vs 3" isn't a big deal on the STOCK size turbine. [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Tune plus downpipes, worth it??
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