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GM-3 turbo question on my 1993 3500

Weasel

Weasel

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Location
North Idaho
I installed the DE 4" exhaust and have the 2.5" xover. The turbo is a GM-3 and the arm that hooks to the WG shaft is tack welded on to the shaft. It seems that the counter clockwise movement of the arm closes the WG and when I clockwise the arm if open, but the arm is horizontal toward the firewall. See second picture.

I don't know if this is correct in my guess on its operation, but the WG actuator can't move the WG hardly at all. It has a hose from the manifold to the actuator dashpot to push the rod attached to the WG shaft arm toward the firewall.

Can one run the turbo with the WG wired open?? Do the GM-3 units make too much boost? I am saving for a ATT kit and my have to do a early replacement if the stock turbo becomes troublesome.
Thank you for advise on the operation of the WG.

Weasel

CIMG03050001.jpgCIMG03040001.jpg
 
They only move 1/16" in operation.
The dashpot is a spring can - nothing more.

Leave it alone unless you are putting a TM on it. Open and it will not build boost. Wired shut and it will build boost, overspeed the turbo and become a restrictive intake heater costing you MPG and other issues like mushy headgaskets.
 
Humm your saying that the actuator has a vacumn line to it? The '93 is totally mechanical with a spring in a "tuna" can, no vacumn at all involved. On my '93 i installed a boost guage and modified the original actuator to create a home made TM. The rod doesn't move much open/closed on those. I wound up eventually replacing the GM-3 with a GM-8 and fabbed another TM. lol
Don
 
daustin said:
Humm your saying that the actuator has a vacumn line to it? The '93 is totally mechanical with a spring in a "tuna" can, no vacumn at all involved. On my '93 i installed a boost guage and modified the original actuator to create a home made TM. The rod doesn't move much open/closed on those. I wound up eventually replacing the GM-3 with a GM-8 and fabbed another TM. lol
Don
Click to expand...
x2, Mine had an SSD one on it. I chucked it for a Heath TM.
 
I will take a pic of the actuator so you can see it. It must have came off another rig. I can't tell how much air pressure it takes to move the rod, and I will see the movement when back together.

Thanks to all of you for help

Weasel
 
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