Well I have had a chance to tinker with my timing a littl ebit and here are the results:
first I bumped the initial setting up 4 degrees to 22. This was an improvement at WOT but the engine didnt seem to like it at idle (manifold vacuum advance). Not so much of an improvement part throttle around town etc....
So I pulled the vacuum can and opened up the "slot" a bit, adding about 10 degrees vac advance. The engine did not like this at idle on Manifold vacuum, so I teed into the egr ported vacuum line - this was the ticket.
The engine idles at 750 rpm 22degrees and smells, sounds and idles great!
just off idle the vacuum advance kicks in and really has enhanced the response of the car to throttle.
WOT runs are a blast, simply put.
I run 3.08 gears so around town I am not way up in the rpms. I am typically cruising at 1500-1750 when the vac advance is all the way in.
My one concern is how this setup will fare on the hiway for extended driving. Lets say I am at freeway speed, maybe 2500 rpm with mechanical advance all the way in and high vacuum cruise....66 degrees is a lot of timing. I wonder if it wont run overly hot or have some other issue. Time will tell.....
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Ken G
1979 Trans Am 403
Black/Gold Ttop
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