My aftermarket boost gauge

eclipse
mitsubishi

#1

i have a 1996 eclipse gst with a 16g turbo and i have a aftermarket boost gauge and the needle on the gauge is in the vac. side and it does not go in the psi side what does that mean


#2

IF the gauge is correct, it means you have a dead turbo, giving no boost.


#3

If it’s stuck in the VAC, then it’s probably a problem with the gauge itself, either it’s defective or it’s not hooked up right. Under normal acceleration, even in a non-turbo car, you should not be pulling vacuum.


#4

Does it read 0 with then engine off, then go to the vac side with the engine on? Does it vary as you give it gas?

Here’s a good site with a demo: http://www.secondchancegarage.com/public/186.cfm


#5

The ONLY time you will see any boost is at WOT…At all other times, the throttle creates manifold vacuum… With a turbo, at WOT, the vacuum should drop to zero and then slowly build pressure as the turbo spins up…