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Boost reads in the negative?

h0wl0ngcanitbe

h0wl0ngcanitbe

Lifer
So I just hooked up my boost gauge and it reads in the negative -20 -10 range? It sweeps about 10psi in the negative but I just cant figure out what could cause this. I bought the gauge from a member and it was said to be new so maybe I have a bad gauge?

Its late and dark now, ill post a vid of it tomorrow, I taped the line under the snout and bought nice couplers for the T but it just reads in the negative. :th_scratchhead:
 


Where did you hook it up? Needs to be on nipple by the coolant elbow underneath the supercharger snout.
 
When idling you should pull around -20 VACUUM. You don't want to see boost until you get on it. That's completely normal.
 
Sandman said:
When idling you should pull around -20 VACUUM. You don't want to see boost until you get on it. That's completely normal.
Click to expand...

Ok that makes sense I guess ill rip up the freeway a bit and see how it goes. On a side note, and this could be unrelated. My MPGs went down the tubes? Car is running just fine and it could be cause its a fresh tank and I havent had a chance to take it on the freeway but my MPGs is in the 16s and its typically 20-23 range mixed. Could these be related?
 


Well that makes sense, the car is a 97 and im assuming its stock. What else is weird is I cant seem to floor it while in the 65mph range the pedal feels hard could these be linked? Or is that maybe while I was rooting around under the dash cause a kink?

Im assuming replacing the specific vac line I taped into isnt too tough?

My MPGs are somewhat back to normal. I drove it on the freeway and she was climbing up back towards the 20s, Havin an aeroforce is trippy!
 
see now i have mine tapped into the right spot, but will only ever read max +2psi boost
not sure if the gauge is shot or not, but i don't even have any kinks or anything in my line either....
 
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