Miata Mailing List: December 1997, Message #32
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From: 	Dan Scolnick <dans@dmscomp.com>

Subject: Re: Setting timing at 21 

Date: 	Mon, 1 Dec 1997 11:09:52 +0000



Michael,

	I tried 20 on my '94, then backed it off to 17 degrees.  You'll see an

improvement on the very bottom end and it will hurt you everywhere else

(like from 3000rpm up).  

	Another interesting thing i've noticed is there seem to be a few variables.



1.  High initial >14 degrees advance gives you better bottom and worse top,

up to about 18 degreeds.

2.  14 degrees gives you more oomph above 6000rpm (and less off-idle)

3.  If you have too much advance the throttle response flattens out at

higher rpms

4.  If you have way too much advance you'll get ping or knock.

5.  The gas available in your area seems to have a great deal to do with

how much initial advance you can carry.



	my NY car can run more advance (17 degrees) than my CA car (14 degrees).

While both areas use oxygenated gas, and both areas are at sea level, Shell

Premium is 93 octane in NY and 92 octane in CA.  NO knock or ping at either

setting (14 or 17) but the CA car has flat throttle response near WOT at

lower and mid rpm.



	in any event 21 degrees is probably way too high to be a good comprimise

for initial timing.



/^\dans







At 01:07 AM 12/1/97 +0000, Michael P.McDonald wrote:

>

>

>        I was wondering if anyone had set their timing at 21 degrees.

>

>        I was talking to my miata mechanic, I told him that I had the timing

>set at 14, and was considering putting it up to 18 since I am using 93

>octane all the time anyway, he said as long as I was going to run 93 octane

>gas then I could just go ahead and put it to 21, in his words, " You'll be

>amazed"

>

>        So I'm wondering if anyone else has done this. Any second opinions,

>could it hurt anything

>

>        Thanks

>        

>        Michael

>

>

>

>

>Michael P. McDonald and VENOM

>90 Base Phredd 

>Covington, Louisiana

>EUNOS_ROADSTER@Mindspring.com

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