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zero boost on aftermarket guage

hourang

hourang

New member
so i finally hooked up my boost guage on friday. its an Equuis from oreillys. so it reads zero when not running, -15 to -19 at idle, -10 and normal throttle, and ZERO and WOT... DIC guage reads all bars full boost. and i know im getting boost because its fast and feels like the boost is kicking in and the blower is loud. did i hook it up to the wrong vacuum source? i figured any vacuum source would get boost, maybe not. i hooked it up to the easiest spot to reach since i was being rushed to leave by my wife. its that 3 connecting thing on top of the blower, its connected inline of the middle one, the one next to the line that goes to the bbv. im thinking of trying the bbv line and if that doesnt work then the one by the map sensor?
 


hourang said:
did i hook it up to the wrong vacuum source? i figured any vacuum source would get boost, maybe not. i hooked it up to the easiest spot to reach since i was being rushed to leave by my wife. its that 3 connecting thing on top of the blower, its connected inline of the middle one, the one next to the line that goes to the bbv. im thinking of trying the bbv line and if that doesnt work then the one by the map sensor?
Click to expand...

Think this through, don't just try this and that. That vacuum manifold you connected to is before the blower rotors, so how's it supposed to see boost?
 
Scimmia said:
Think this through, don't just try this and that. That vacuum manifold you connected to is before the blower rotors, so how's it supposed to see boost?
Click to expand...

im too new to these cars to know the routing of the lines, havent messed with it much besides the air filter. its right before the bbv, so the bbv doesnt see boost? i knew this was most likely the problem and would have fixed it but i wanted more information on why so i can learn more about the complex vacuum system on these cars.
 


hourang said:
im too new to these cars to know the routing of the lines, havent messed with it much besides the air filter. its right before the bbv, so the bbv doesnt see boost? i knew this was most likely the problem and would have fixed it but i wanted more information on why so i can learn more about the complex vacuum system on these cars.
Click to expand...

The black canister is just the actuator for the BBV, so no, it doesn't see boost. It's really not that complicated, you have the inlet for the supercharger, the rotors, and the outlet. You're connected to the inlet, which is before the air is compressed. You need to connect AFTER the rotors.
 
Scimmia said:
The black canister is just the actuator for the BBV, so no, it doesn't see boost. It's really not that complicated, you have the inlet for the supercharger, the rotors, and the outlet. You're connected to the inlet, which is before the air is compressed. You need to connect AFTER the rotors.
Click to expand...

ah i see. thanks!
 
stupid t fittings. tried to tap into the t fitting under the snout and the t fitting just broke like it was plastic. have it rigged with electrical tape right now, but will need to replace them. anyone replace all their plastic lines and know what size t fittings and hoses you need? i know there are 2 different sizes i need because the connector under the snout is big and the one on the fpr? is small.
 


No, i used some small rubber hose... maybe 1/8" ... stuck it over the nipple under the snout... then using the plastic, barbed T... used two more pieces of rubber hose to connect to the plastic lines.

Would it help better if I got you a picture?
 
Lawngoose said:
No, i used some small rubber hose... maybe 1/8" ... stuck it over the nipple under the snout... then using the plastic, barbed T... used two more pieces of rubber hose to connect to the plastic lines.

Would it help better if I got you a picture?
Click to expand...

oh im saying i want to replace all the plastic lines with rubber and brass Ts.
 
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