FW: Electronic timing advance

[Tom Parker]

HADJIASLANIS ARIS     1260 800 <aris at exmail.panafon.gr> wrote:

>after following your inputs and using the web as much as I could, I have
>now found and ordered a XR 700 ignition unit from Crane Cams which WILL

I have one of these in my Mini, they are pritty good.

>My original posting to which you replied most kindly was ...
>"... 3. Feed the optical pick up output to a digital advance / retard
>unit
>implementing a simple, programmable advance curve capable of at least 16
>sites.
>4. Optionally add an imput for a detonation sensor to provide a few
>degrees of detonation induced retard.
>5. The unit should just provide an output emulating a normal contact
>breaker, to drive a separate high energy electronic ignition unit
>(already fitted in my car)...."

I am attempting to build the system that is on the diy_efi web page. However,
due to lack of funds, and the fact that my brakes don't work right, I haven't
made much progress beyond deciding to use an off the shelf single board
computer and a custom interface board to go with it.

I plan to extend the design to take note of a MAP sensor, maybe a TPS sensor
and maybe also a knock sensor.

I looked at the picknpoke design (this is the kit that Jaycar in australia
sell). It has a two stage advance curve. You can specify the steepness of the
advance in two lines. It doesn't have a very good (IMO) vacuume advance
system, and the biggest problem is that you can't change the program without
reverse engineering it.

Having said that, it is cheap, and it is available now.

--
Tom Parker - tparker at nznet.gen.nz
           - http://www.geocities.com/MotorCity/Track/8381/