Miata Mailing List: January 1998, Message #5546
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From: 	dakeen@cybermedia.com

Subject: timing advance & horse power on Dyno

Date: 	Thu, 29 Jan 1998 21:37:56 +0000



To establish a baseline for future modification I dyno'd my 1997 Miata at

the stock advance and at 14 degrees BTDC. The car has no AC and is totally

stock except for a custom exhaust from the catalytic converter back(to

allow the spare to be mounted under the car).



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.



I only get the "weekly digest" of this mailing list so my responses will be

delayed accordingly.



Rear wheel hp at 2 different advance settings:



	advance:

rmp 	stock	14BTDC

2500	42.4	46.6

3000	52.5	56.2

3500	61.3	64.6

4000	69.5	72.9

4500	78.5	81.7

5000	92.3	94.4

5500	103.1	105

6000	107.9	109.7

6500	112.5	110.9 (wierd dip???)

6900	108.2	109.2 (this dyno does not behave well at 7000 so we ran at 6900)



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.



dk