Intake piping volume calculator? Proper length and volume intake - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-18-2017, 10:27 AM   #21
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that setup sounds cool, and probably adds a few ponies up top, but does lose midrange iirc. someone here dyno'd it. probably not enough to "feel" though
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Old 05-18-2017, 10:30 AM   #22
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Yeah that's my point and yours as well......the power is marginal, hard to even measure. Depending on what application you're building the car for there a ton of other items that are worth your time.
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Old 05-18-2017, 10:47 AM   #23
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I'd be curious to see him route an intake down just like we normally route IC piping, and then into the bumper, to draw from the passenger front side of the car.
I vaguely recall someone on mnet doing this many years ago, with decent results. Would have to heat wrap the thing though, to keep the radiator air off it
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Old 05-18-2017, 11:01 AM   #24
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You need this.
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Old 05-18-2017, 11:05 AM   #25
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In response to 18psi - That's the way I've always wanted to route the intake, that way it gets the freshest air. It would be longer than Emilio found to be the ideal length, but might be offset by getting much cooler air.

Also, it would be neat to convert the passenger headlight into an air feed for a custom air intake box.
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Old 05-18-2017, 11:06 AM   #26
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I pretty much did that with my turbo inlet piping.




The key is the ducting, seal it to the nose so the fog light hole can feed air to the filter while keeping water off of it from the tire. I've driven it in rain a few times with no I'll effects.
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Old 05-18-2017, 11:10 AM   #27
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that's real neat looking, nice job
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Old 05-18-2017, 11:59 AM   #28
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Im pretty sensitive to whats going on with my car. If I drive to a 1000 ft different elevation, its only a difference of 4whp, but it feels significant. (General rule of thumb is 3% difference per 1000 feet)

thats why i know ill be happy (if i gain any power with this intake) because i can feel it baybeee!
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Old 05-19-2017, 12:27 PM   #29
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Anyone know how resonance/harmonics work?

If I maintain the same ratio of volumes (total effective intake volume to resonating chamber volume) will the Helmholtz effect be preserved in the new intake?

What I'm planning to do is seal up the oem intake, and completely fill it with water (with the resonator removed?) to get the volume, then do the same with the resonating chamber.

This ratio will be used to solve for X, X being the volume of the new resonating chamber on the new intake. (I'll first need to find out what volume my 19-21inch intake will be)
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Old 05-19-2017, 12:36 PM   #30
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resonant frequency is:

So you're messing with l and V, so you should be okay. Realize you are working under a square root. Idk how it relates to intake, but I had a lecture on it like 2 months ago.
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Old 05-19-2017, 02:23 PM   #31
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Oh, so it doesn't matter what volume the intake is, I just make sure the new chamber has the same resonant frequency as the oem one. Seems easiest to just use the oem resonating chamber somehow.

Any ideas on how to affix it permanently onto an aluminum 2.5" tube?
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Old 05-19-2017, 02:25 PM   #32
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Old 05-19-2017, 05:13 PM   #33
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^doesn't seem that vibration resistant, I just sent an inquiry to MasterBond, to see what they recommend in a high vibration, underhood application between plastic and aluminum.
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