[Gmecm] IAC / AIS Setup - $8D/7730

[Clair Davis]

My current ignition map is very similar with respect to the idle advance.
In the closed-throttle idle curve, I've got a fairly high advance for my
normal idle range and that corresponds to a localized flattened peak on the
Spark Main table.  From a stall-saver perspective, maybe I should draw it
out towards the higher vacuum end a bit more than the +/- 10kPa and +/-
200rpm around my target idle that I have now.  So far, I've just been
focusing on making the engine idle well with the cam I have.  I haven't
really driven it enough to find any stalling problems, but the VSS function
seems to be doing its thing.

Clair

----- Original Message ----- 
From: "Robin Handley" <Robin at FuryWorld.fsnet.co.uk>
To: <gmecm at diy-efi.org>
Sent: Friday, April 06, 2007 1:19 PM
Subject: Re: [Gmecm] IAC / AIS Setup - $8D/7730


> FWIW I find that I don't miss not having an IAC to keep a stable idle.
I've
> manipulated the ignition map so that there's a localised SA peak at my
> desired idle RPM (e.g. 1000), and the SA drops at RPMs below and above
that.
> The idea is that increased SA lifts the engine speed up to 1000, and if it
> goes past 1000, then the reduction in SA causes it to drop back. Seems to
> work quite well, and doesn't compromise the driveability of the car. Not
as
> sophisticated as IAC, but easier to set up!
>
> http://www.furyworld.fsnet.co.uk/Images/XE_Ignition_Map_8Jul06.gif
>
> Robin
>
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