Quote:
Originally Posted by mike100
Ok, there is some reference to the 2nd MAP sensor- that was meant for another non-ZR-1 forum where people aren't aware of the function of our vacuum secondaries (for those of us who still run them anyways  ).
To clarify, manifold vacuum closes the muffler flap- they are open at rest.
-To have run the valve straight from the secondary pump would have had the logic 180 reversed- plus they draw too much air and would have messed up the function probably.
So what I did was use the normally open contacts on that adjustable vacuum switch that triggers another vacuum source (through a GM EGR solenoid) when the secondary activates. What it actually does is release the actuator vacuum to the vent(when u step on it) as the solenoid is allowing vacuum through in the off condition (during cruise conditions). It is sort of reverse logic.
The vacuum source is NOT plenum vacuum. it is an is a check-valve isolated source (the vacuum ball under the d/s headlamp. |
OK, I got a clear picture now.
Your approach is interesting, and I suspect has very "digital" (read: either ON or OFF!) characteristic, compared to the direct vacuum line from the plenum to the NPPs (i.e, the FBI approach).
Simple and elegant vs. complex and wonderful?
I don't have a feeling either way, far as which is a better solution. From a simplicity view, the FBI approach is as simple as it gets. However, I think your method has potential to sharpen the NPP operation considerably - especially if dual, electrically triggered solenoids were used; one each for each NPP were to be employed.
Yours is an interesting approach, "fer sher". Thanks for sharing!!
