Miata Mailing List: November 1997, Message #31
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From: 	becalizard@earthlink.net (Rebecca Zook)

Subject: Re: horsepower increases from 94 to 97

Date: 	Sat, 1 Nov 1997 10:18:13 +0000



>There's something that I just haven't been able to figure out.  The stock

>1994 to 1997 Miatas all have a 1.8 liter engine, but each year there is a

>horespower increase over the previous year.  How do they do this? What

>changes are made to the engine each year?



94-95 128hp

96-97 133hp - due to the OBDII computer system.  It has more sensors and

controls which allowed Mazda to tweak the fuelmap in the computer more

efficiently, hence, an extra 5hp.

99    140hp - 1.2 point higher compression pistons, maybe more small

tweeks, gaining another 7-10hp.  Final official hp will be determined when

emmision testing is complete.



Merv







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WHO:

  Rebecca 'the blue' Zook - Newsletter Editor (LSC)

  'Mad' Merv Stauffer- Competition Information (LSC)

MIATAS:

  '94 Laguna Blue R  -'Shelby'- LIZRD

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