D-Jet Ignition Ideas

[pbanders]

The discussion on timing has me thinking of a couple of ignition system ideas that may improve performance. Both may be applicable to L-Jet with some modifications.

First, 75-76 (74, too?) 2.0L cars would likely benefit from retrofitting the 73 throttle body and connecting the vacuum advance. It was disconnected to reduce NOx and HC emissions at the expense of higher fuel consumption and less part-load torque.

Second, idle performance might be improved by reducing or eliminating the vacuum retard. The idle has always been pretty load-sensitive, and turning on the headlights or blowers can drop the idle significantly. I suspect this is due in part to the low idle power output caused by the retarded ignition (again, an emissions reduction approach). If the retard is eliminated by plugging the hose, it may impossible to set the idle to specification (too high). You may (or may not) be able to fix this by blocking the bleed port that is drilled in the throttle plate. Note - I haven't tried this modification and cannot prove it would work.

The extent of the retard may be reduced by shimming the mechanical stop in the cannister. Bosch shows some canisters with a cam for the stop that's adjustable, but the 205A dizzy I have has a fixed stop.

[mikester]

that is the sweetest garage I've ever seen in my entire life...

[nutzforporsche]

Wadda nice garage!!!!

OK I'm Jealous! LOL