Spark Plugs - pre ignition issue

[jdbubb at ix.netcom.com (Dan Bubb)]

I'm a little skeptical here.
Why are you running 36 degrees advance and wishing for more?
Advance at WOT above 3500 RPM should be in the low 30's.

Ignition advance is not a case of more is better. If you're using low octane
gas (you're not) or have a really high CR (you don't) then you may want as
much advance as you can get. But, you've got good gas and a relatively low
CR so you should run the advance that is optimum for power. In the low 30's
(unless I'm totally mistaken and the 8V has a great combustion chamber that
is best at 32 degrees and the 16V chamber sucks in comparison).
I'm just harping on this cause there are way too many people that think more
ignition advance and more fuel is always better. In both cases there is an
optimum amount that is not necessarily the most you can get.
If you know you will make more power at 36 or higher that's fine. But, don't
just crank in more advance cause "more is always better!"
just my .02
Dan

----- Original Message -----
From: "Bradley Peet" <btpeet@effervescent.com>
To: "Scirocco List" <scirocco-l@scirocco.org>
Sent: Thursday, July 24, 2003 11:22 PM
Subject: Re: Spark Plugs - pre ignition issue


> Hey, Ben.  I'm surprised you're having an issue with detonation
considering
> the 93 octane gas and somewhat conservative factory ignition timing.  I'm
> running 36 degrees of advance now on my 16V with approx 9.3:1 CR and 92
> octane pump gas and no pinging at all.  I'd crank the timing up more if I
> could but I'm maxed out right now due to my crank position sensor.
>
> Sounds like you are right on the threshold, though, and -- I know it's
> frustrating -- but 2 degrees of timing should not be a night and day
> difference.  Is there any possibility the timing is not set where you
think
> it is or the advance is somehow too aggressive?
>
> Good luck.
>
> Bradley
> s16v.com
>
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