Secondary Vacumm Pump question???

[Dynomite]

Originally Posted by weldbead

what would be the down side of physically tying the butterlies open but leaving the the ailing vacuum system alone?

Not much except removing the secondary butterflies gives you totally unrestricted air. And the logic for secondary
Injector firing should be changed. I have no clue why one would leave stuff not used in the valley.

[Roadster]

Originally Posted by weldbead

what would be the down side of physically tying the butterlies open but leaving the the ailing vacuum system alone?

Originally Posted by Dynomite

Not much except removing the secondary buttrrflies gives you totally unrestricted air. And the logic for secondary
Injector firing should be changed. I have no clue why one would leave stuff not used in the valley.

Other that what Cliff has mentioned above, it seems like they were just lazy with that particular function. On a side note, the PO did mention that this was the best running ZR-1 that he owned. He add 2 others before this one, a 91 and I think a 95, he really liked the way it performed, but he was hot on the trail for a Cobra Replica car, so the 94 had to go.

[Hog]

I would be interested to see the complete torque curve difference between installed but non-functioning port throttles compared to completley dissected port throttles.