Miata Mailing List: January 1998, Message #5563
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From: 	"John Freas" <jfreas@gte.net>

Subject: Re: timing advance & horse power on Dyno

Date: 	Thu, 29 Jan 1998 23:01:21 +0000



Previously on timing on dyno, dakeen@cybermedia.com said...



> I can't speak for the absolute accuracy of the dyno but the relative

> numbers here should prove interesting to those contemplating changing

their

> advance. Any higher advance pinged terribly in upper RPM's on the premium

> gas I was running and the power was no better in the lower RPM range.



[dyno data snipped]



> So is a few hp worth always running premium? I don't know but no matter

how

> you look at it, it is cheap horse power.



Thanks for the information.  I've always figured the timing bump was worth

about 3 or 4 hp, and that seems to be the case.  It is interesting that

your car requires premium at 14 degrees.  Mine runs fine on 87 octane at 14

degrees except under hard acceleration on summer days.  89 octane is enough

to keep it under control.  True that different Miatae respond differently

to timing changes, but yours seems a bit extreme.



In any case, the hp gain is worth it IMHO, even with premium gas.



	-John



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John Freas (jfreas@gte.net)

Red '90 Base-ish #7690

Deer Park, Long Island

Team Laguna Seca

Team dlralt

Team PBC

Team Roebuck

Team Voodoo

"I have no idea what those dimple things on the windshield frame are for."

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