Idle in the SS is about 18 psi (vacuum, meaning below zero). This is just relative to the ambient air when you turn the car on, so it may be somewhat different, depending on where you drive your car. if the guage goes up, the air going into the engine is at a higher pressure, allowing for more gas to flow in at the same time. More gas that can be burned (as a result of the increased pressure) leads to more power produced, and as a result, a car boosting at 12 psi is producing a lot of power compared to a 18 psi vacuum. As the SS is supercharged, you will notice an immediate change in the psi reading whenever you hit the gas pedal. I've noticed that if i'm in gear without my foot on the pedal, the engine will produce a vacuum greater than the idle vacuum, but i'm not exactly sure what that means or why it happens... like SVT said, at WOT, the boost will increase to 12 psi, but it probably won't start at 0 - from experience, anywhere from 5 to 10 psi, depending on the rpm and the gear you're in. Anyways, hope that helped!stiggonometry15 said:when the car is at idle what should the guage read. and what does it mean if the guage goes down or up. whats the difference between the two...please explain, im lost. thanx for any feedback
Agreed. You'll see boost as soon as you step on it. You shouldn't see 0psi at WOT.GoofyGuy said:No you wont ever see 0 at WOT. the car does not build boost its not a turbo. Get some supercharger knowledge. I have installed gauges in Redlines at 1500 rpm in 5th gear so you can watch it climb. The boost is at 3psi that low and its instant. There is no LAG. If you disagree then drive any Supercharged vehicle with a gauge you will see that you are wrong.