Adjustable electronic ignition

[Mark Boxsell]

>Just a quick question,
>                                My Holden Commodore runs a Buick 3.8 litre
>V6 and uses a crankshaft sensor for the ignition timing. What I want to do
>is vary the timing, preferably from inside the car. One way to change it,
>although being non-variable, would be to offset the sensor slightly to
>obtain a fixed advance or retard in the timing. What I would prefer however,
>is to intercept the signal before the ECM, and somehow modify it
>electronically to make it appear that it is advanced slightly. 
>
>Can I do this with a simple capacitance type delay, or would I need to use a
>specialised circuit? Also, any ideas what the delay would have to be -
>milliseconds, nanoseconds ? Ideally I would like to have some sort of dash
>mounted box with an adjustable dial or something along those lines.
>
>All input is most appreciated.
>
>Adam Tate.
>[at at multiline.com.au]
>http://www.multiline.com.au/~atate/index.html
>
>

Adam,
       you can use a Haltech IG4 programmable ignition timing computer to
control the timing on your Commodore. It will give you even more load points
than the factory! plus data logging, etc. I guess it's not exactly a DIY
solution but I thought I would let you know it can be used in that way. 
                regards,
                         Mark Boxsell
                         MRB Design