BigRedVert

I've got a 88 vert that has missing exhaust components and I want to swap the whole thing out for a Rb one And I can't find any information on running an airpump with no Cats on these cars

Cardinell

The air pumps in our cars don't go directly to the cats, like in most cars. The air pump feeds the ACV on the LIM. The only thing that connects to the cat is the back pressure tube for the 5/6 ports

rlynchster

I think it connects to something else besides just pressurizing the 5th and 6th port actuators.

I believe it also goes to the (ACV) Air Control Valve but don't quote me. . . .I gotta poke my head down there to remember where it lands.

I posted a pic out of my pic folder showing the two lines and check valve.. . .Normally that check valve is part of the metal tube assy that runs to the cat on the other end... (the big cat should have a port off the side). .I cut a working check valve off an S5 version I found and clamped it in as you see using silicon rubber hose.. . . Finding a working check valve was hard.

You'll need that small 6mm line running back to the engine bay to power the actuators. . small line in pic. .. .Make sure the new exhaust has it if you are doing cat delete. .. . I have a bonez single cat 2.5" setup and it works good.. . .Having 1 cat keeps the fumes down.

Believe it or not I think the diagram is wrong. . . .The small line tees off prior to the check valve but honestly I don't think it matters.







single bonez vs 3 cat OEM CA emissions.. . . Notice the port on the end cats on both . .. .this gets ran back to the point in question.

exhaust pipes and leaned against the wall opposite to each other. up/down/flow