Miata Mailing List: August 1993, Message #47
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   From: hazmat@motor.arl.army.mil (Matt Bennett)
Subject: Re: performance mods
   Date: Mon, 9 Aug 1993 11:43:38 -0400


>From:	bob@aztech.ba.md.us (Robert V. Meushaw)

>I would like to know if anyone has made the low cost performance mods
>made in past issues of Miata mag.  The mods I saw included advancing the
>timing to about 14 degrees BTC, using Spitfire plugs, changing to a
>better air filter, and perhaps a few other minor things.  I'd like to
>know if anyone can comment from experience on these changes.

>I am particularly interested in the timing change.  What are the disadvantages
>of making this mod?

If you advance the timing you will have to move to high octane gas to prevent
engine knock.  This is a pretty popular change on most vehicles,  I know it
is also really popular with Mustang 5.0 engines.

On a related topic:

What do these performance mods do to the economy?  What would be good would
be something that is roughly the same for sane driving and only starts hitting
the mileage when you push it.  The Jackson Cold Air kit looks like it might
help in that respect.  I saw the CAI advertised in the Summer Magazine, but
they left off the price.  Anyone know how much it costs and any other
disadvantages to it?

--
Matt Bennett                           hazmat@motor.arl.army.mil
92 Mazda Miata, Red
83 Yamaha Seca 550 --- Sold            79 Yamaha RD400F Daytona Special
81 BMW R100RS                          72 Yamaha R5