[Diy_efi] Ignition Timing

[Becker, Damon Damon]

I'm using an aftermarket EMS.  The stock ECU can't control my
combination of cams, injectors, turbo and various other things I have
done.  

  _____  

From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
On Behalf Of Jim Butterfield
Sent: Tuesday, July 26, 2005 3:36 PM
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] Ignition Timing


Hi Damon
Glad to see your looking into all aspects of making big HP, its a bigger
concern today with these new power plants... ive a 3800 SC engine and we
really have to watch the knock as we drop in pulley size.... our engines
have knock sensors. What we do is just drop a pulley size and scan the
engine computer.. we can then look at the log and find out how much
knock retard we get.. two choices there... get the exhaust to flow
better or lower the boost... If you have a newer car and it has a knock
sensor as yousay, get a scanner  for your pcm and drive and check the
logs... 
 
whats the MBT you talk of???
 
jim

"Becker, Damon (Damon)" <damonb at avaya.com> wrote:

	I have a turbocharged 4-banger making around 350 crank hp.
Knock is clearly a concern in this setup as I map my EMS.  This
discussion is for the knock-limited range, not the off-boost cruise
range.  Since I'm knock-limited, I won't hit MBT timing before I hit
knock, right???

	I have read many books that advocate reading the plugs as a
great way to set the ignition timing.  I have read other places that
using a stethoscope against the block and listening for knock under
heavy loads while doing the dyno runs is the best way.  I have yet
others say it's best to use the stock knock sensor (unmodified
internals, stock knock sensor still valid) to listen for knock.  

	What's your best way?  

	Thanks for your time, 
	Damon 

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