AFM measurement/backpressure (was Turbo speed sensor)

[Mike (Perth, Western Australia)]

At 11:44 AM 8/03/2000 EST, you wrote:
>Hi Grumper,
>waaay back in the early 60's, drag racers would cut a slot in the firewall,
>and stick and "arm" off the dissy, which they would move
>to retard the timing at high rpm, after they hit high gear.
>Crude but effective.  The only caution, was exhaust temps
>increased noticably.  Not a big deal for a few seconds..

Thats very similar to what I had in mind, as its quicker and easier then
an ECU update (at the time).

Run a diaphragm off the boost to a link which rotated the dizzy, the linkage
is real simple and a lever arm of varying lengths would give varying
amounts - my ECU apparantly doesn't retard timing at all. It was only
meant for 7psi boost (3L, six T3 standard 60trim) so the simple mechanical
setup would be ideal - though it would look strange on that model ~`:!

Trouble is I really don't know how much retard I need for what boost :(

Any idea (as a starting point) how much retard I should have from say
7psi to 10psi on a 3L six ?

Tah

:) Mike

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