Forced Induction Systems

Last updated: 27 August, 2002

Jyri J. Virkki

Welcome to the *charger section of the Miata Tips From the Garage. There seems to be quite a lack of hard data on all the various super and turbocharger systems for the Miata. This page will attempt to collect as much information on the various products into one convenient location as possible. It is very incomplete at this time though, so I will really appreciate any input on any of the systems. If you have direct experience with any of these products and have any information to add to what is here, please let me know!!

Disclaimer: I have not installed any of these systems (yet). That's probably good: even though it means I have no direct experience with any of these kits, it also means I have no preference towards "my system", as I don't own any of them. All the info is gathered from the Miata mailing list, various magazines, and advertisements (and hopefully from all you *charger owners who will now rush to send me more info ;-). Wherever possible, I've noted the source of the various claims. Note that sometimes there are more than one conflicting values from different sources!


Both a supercharger and a turbocharger perform the same function - push much more air into the intake. A supercharger is driven by a belt off the crankshaft pulley, while a turbo is driven by exhaust gas pressure.

Some selection criteria for forced induction systems (based on article by Corky Bell in GRM)

Some generic notes on Miata installations

[Superchargers] 3 basic styles: roots, centrifugal, twin-screw

Bell Engineering - BEGI Supercharger

[1] Dyno testing, (email address no longer valid.)  [2] Dyno results, Brian Goodwin

Sebring Supercharger

[1] GRM testing MCA 1.6L car. With JR header, Genie turbo muffler, NACA duct. [2] Dyno testing, [3] Dyno testing on 1.8L car with JR header and Borla exhaust, Jim Rich. [4] Dyno results reported by Brian Goodwin [5] On a 95 with J&S knock sensor, JR header, cat & catback, on the JR dyno. [6] Reported by Bob Krueger, on a 1.6L on the JR dyno.

Nelson Supercharger


Bell Engineering Aerodyne Turbo

Stage I


[1] Dyno testing,

System III

BBR Turbo

Greddy Turbo

[1] Norman Garret, @5psi

Here's the Answers!

All right, all right... actually you won't find the answers here. That's because there actually is no One True Answer on this issue, and that's probably the only "true answer" to keep in mind. As on everything else in life, there is a range of solutions, none of which can be perfect, so they each implement their own unique set of compromises. Which one is the right answer depends on which set of compromises you decide to live with and which you won't.

This section collects some postings that have been made to the Miata mailing list that I found interesting and informative.

Tech Tips

One constant with all the units is that some extent of tuning and experimenting will usually be required to get it just right. This section is intended to collect troubleshooting experiences from owners who have been through it.


  1. Grassroots Motorsports 3/95, 7/94, 9/96
  2. Turbo Magazine 1/95, 9/95
  3. Sebring Supercharger advertisements/web site
  4. Bell Aerodyne advertisement/web site
  5. The Miata mailing list

Addresses/Phone numbers

Pointers to miscelaneous items of interest...

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