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Miata NA flow restrictor - image
Mechanical/Functional

Miata NA flow restrictor

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Use the part context as a starting point, then confirm geometry-dependent values in your slicer.

Files

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Material start

PETG or ASA for durability and heat resistance

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Strength start

20-30% infill for a balance between strength and weight

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Orientation / supports

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Exact totals

Slice for grams + time

Model geometry and final settings determine both

Vehicle exposure

Cabin/interior use; avoid high-heat zones

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Description

This is a flow restrictor that normally resides between the valve cover and chrome tube. If you replaced the hose due to age, and didn't swap over the restrictor, you probably need this. Not sure if this restrictor is on the latter cars or not. It will affect your idle, so make sure to do the TEN and GND and set base idle again after installing. If you have been experiencing the dreaded idle droop, this is a good first place to look.

Compatible Cars

Published Jun 26, 2026Updated Aug 10, 2026

Originally published on thingiverse.com by jeff greenfield (underthetire) · License: CC BY-NC

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