Spark Plugs - pre ignition issue

[jason at scirocco.org (Jason)]

Okay -- glad you just pointed that out:  36' of Advance at 5500rpm is one 
thing.  We're talking about 6-8' advance at *idle*.  My CIS-E Mercedes 190 
used 42' advance at 4000rpm.  36' of advance at idle would cause the car to 
not run. :)

Jason



At 11:14 AM 7/25/2003, Bradley Peet wrote:
>Right, there's a point at which too much advance will hurt power and/or
>cause detonation (ping).  So the only reason I'd want to crank it past 36
>degrees advanced is to find out where that limit is.  Per the SDS website
>(sdsefi.com) the rough guidelines for ignition advance were between 30 and
>40 degrees, so - even though I'm not running SDS - I wanted to explore that
>range.  Frankly, I was amazed that I'm not getting any pinging and the motor
>is pulling so well with 36 degrees advance (at 5500 RPM).  Much better than
>at 24 where I had it initially (trying to be cautious).  Hoping to get it on
>a dyno soon to get some objective measurements before tearing it apart again
>to bolt up the turbo.  Only put down 118 WHP with CIS-E so I'm anxious see
>what the programmable engine management will so.
>
>Bradley
>88 S16V 2.0L EFI
>02 S4 Avant
>FOR SALE: 97 CBR 1100 XX http://s16v.com/xx
>
> > From: Dan Bubb [mailto:jdbubb@ix.netcom.com]
> > Sent: Friday, July 25, 2003 5:58 AM
> > To: Bradley Peet; Scirocco List
> > Subject: Re: Spark Plugs - pre ignition issue
> >
> > 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.
>
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