Miata Mailing List: May 1993, Message #97
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   From: (none)
Subject: Re: Power Chips?
   Date: (none)


On Thu, 13 May 1993, The Terror That Flaps in the Night wrote:

> 	I've been reading the postings about Auto-Cross, modifications
> and the like.  I was wondering if anyone company makes those nifty Proms
> for extra performance.  I'm not sure I'd use them myself, but I haven't
> heard anything about them at all, so I got curious

Yes, ther are companies that can supply you with such a thing. Personally,
I wouldn't use one. First of all, they are *certainly* not legal for Stock
classes. Second, they do awful things to your emissions in the name of
mild performance increases. You see, all they can do is change the
mixture. They don't change the *size* of the fuel-air charge in the
cylinder. The only way to get a big performance boost is to increase the
amount of fuel+air in the cylinder at ignition time. Thus, intake mods,
exhaust mods, and recamming all allow more charge in naturally. A
turbocharger just compresses a large charge so it fits in a small
cylinder. :-{) Superchargers likewise.

In the Miata, mild bolt-on performance (new cams, intake and exhaust) are
good for about 20 horsepower total, it seems. After that, you go to
turbochargers, superchargers, and the like.

Does that answer your question?

--
Ken

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  Ken Warren             |"Nothing good has ever been reported about the
                         | full rotation of a race car about either its
  E-Mail: kenw@netaxs.com| pitch or roll axis."            Carroll Smith
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