Is my 914 retarded?, Decel issues Options

[OU8AVW]

I have a built 2056 with stock D-Jet set up based on a 1974 motor. I have it pretty dialed in and my air-fuel ratios are pretty sweet. I'm happy with how it runs, pulls and how fast it is. (It's pretty quick (IMG:style_emoticons/default/biggrin.gif) )

My next challenge is to sort out the deceleration issues. I have a decel valve installed but I am not sure that it's working or even plumed properly. I have a vacuum gauge on the way so I can test it accurately.

I understand that I should test the valve by revving to 3k and dropping back to idle while looking for vacuum to happen for a short period when the air intake closes.

I also see a vacuum fitting on the retard side of the distributor. I think that the die-on-decel issue comes from the AF mixture changing too quickly when the air intake is closed while the dizzy is still advanced from being revved at 3k. Is the retard side vacuum fitting used to counter act this tendency? Right now it's left open....

Thanks in advance, or retard, whichever is applicable (IMG:style_emoticons/default/blink.gif)

[r_towle]

So, the advance and deceleration in the distributor are for emissions.

Try plugging both ports on the throttle body and leaving both ports on the distributor open to the air.
See how you like it.

Advance gives you a slightly better slow acceleration off the line without you needing to rev it up to 3k to pull away from a light...which most of us do anyways.
The main advance is mechanical and happens at about 3k Rpms.
The advance pulls the plates slightly advances as you pull away from a light, it has some positive affect, but not loads.

The decal valve is to prevent over run as you slow down, it helps keep yr mixture lean.
It pulls the plates back from full advance as y slow down, burning less fuel.

The car runs perfectly fine with no Deceleration valve hooked up
It runs slightly worse with no advance hose hooked up, but it's negligible if you are an aggressive driver...

Rich