I've read a lot about the MegaSquirt controller:

http://www.bgsoflex.com/megasquirt.html

I'm also on "The" Scirocco mailing list, and there is about one thread
a month about it.

On 3/15/06, steve vitale <steve@newsie.net> wrote:
> has anyone thought about replacing the ECU entirely with an open design like
> EPIC:
> http://thedotcommune.com/oepec/index.html
>
> also, I'd be interested in hearing about experience with using or building
> the Digitool described here:
> http://www.loam.org/vw/Vanagon/DigiTool/
>
> or other ECU hacking related goodness the list would like to share.
>
> Steve
>