Nordskog boost guage
03-21-2003, 07:20 PM
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Car: 87 Z-28
Engine: 383 HSR w/supercharger, AFR heads
Transmission: 700r4 w/2500 stall
Axle/Gears: 3:73
Nordskog boost guage
I hope this is the right place to post this.
I am using a Nordskog digital boost pressure guage (0-16 PSI). I can't get this thing to work. The sender is installed in the upper plenum. I have power and ground at the guage, and 225 ohms resistance from the sender with the car off. When the car is running I get a .25 volt back feed from the sender. I have isolated all the wiring and know that there is no cross feed. I think I made be picking up electromagnetic interference from the ingintion. Anyone with the same guage encounter similar problems? Any suggestions?
I am using a Nordskog digital boost pressure guage (0-16 PSI). I can't get this thing to work. The sender is installed in the upper plenum. I have power and ground at the guage, and 225 ohms resistance from the sender with the car off. When the car is running I get a .25 volt back feed from the sender. I have isolated all the wiring and know that there is no cross feed. I think I made be picking up electromagnetic interference from the ingintion. Anyone with the same guage encounter similar problems? Any suggestions?
Last edited by Blown87; 03-22-2003 at 10:06 AM.
03-22-2003, 10:05 AM
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Car: 87 Z-28
Engine: 383 HSR w/supercharger, AFR heads
Transmission: 700r4 w/2500 stall
Axle/Gears: 3:73
Here is an update:
I was convinced that I had a back feed, but could not find any. Well, the battery negative was grounded through the supercharger, I only had .2 Ohms resistance at the ground so I didn't think moving the ground would help, but I was planning on relocating the battery to the trunk anyway.
So I went ahead and moved it, thus moving the battery ground to the chasis. Low and behold the back feed is gone! The guage works properly now.
The moral: Good grounds=happy circuits.
I was convinced that I had a back feed, but could not find any. Well, the battery negative was grounded through the supercharger, I only had .2 Ohms resistance at the ground so I didn't think moving the ground would help, but I was planning on relocating the battery to the trunk anyway.
So I went ahead and moved it, thus moving the battery ground to the chasis. Low and behold the back feed is gone! The guage works properly now.
The moral: Good grounds=happy circuits.
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