Weber 32/36 Venturi Vacuum Port? (EGR with Weber Possible?)

[heyman421]

I'm trying to reconnect the EGR valve on my z22, which uses a "venturi vacuum transducer" for control.

Apparently, it's attached to the exhaust manifold by means of a pipe (similar to the EGR itself) and uses a combination of exhaust backpressure, vented, and venturi vacuum to control the amount of vacuum that the EGR valve sees.

The weber has at least 2 vented signal outlets (for the timing advance and EGR) but i don't have any idea where to tap in for venturi vacuum.

I tried going the no-EGR route, but I really didn't feel safe. Especially with hot summer days coming up.

Any assistance would be appreciated.

[PEZi]

I'd have to take a look at my old stock vac line diagram to give you a legit answer, but why do you feel its not safe? If you don't have emissions testing, there is literally no problems with running no EGR mins the NOX gases, which are not a problem unless hooked up to an actual meter.

[heyman421]

Any car with an ECU will pull quite a few degrees of timing when disabling the EGR. I don't fully understand how an EGR effects ignition timing or how to compensate correctly with a mechanical advance curve so I'd rather not have to worry about it.

Also, after my recent head gasket replacement went awry in every possible way, I'm all in favor of anything that will drop my cruising EGT's this summer. Other than that, I never saw a dramatic difference power-wise with it on or off, so I figured I may as well put it back on.

Removing it was more or less a gut-reaction to poor idle. It ended up being a combination of exhaust leaks, tired carburetor, 30-year old plugs and wires, failing head gasket, and a clogged cat (from a combination of the others.) Now that i've got the truck running as well as it's going to, I'm not opposed to reconnecting some of the vacuum-driven accessories one at a time.