Finally turned in the set screw on the STS oil pump pressure switch.
Works good as of now. Got her up to 8psi last night with no screaming peizo buzzer freaking me out.
So let me get this right now, the switch will now act as a 5psi with it turned all the way in and backed out a 1/4 turn?
If thats the case then its letting me get higher oil pressure into the turbo bearings or is it pumping the oil back into the return line quicker/better/higher pressure??
Will doing this to the swith increase the likelyhood of puking oil into my exhaust or decrease the likelyhood?

For those of you who are going to do this be carefull with this screw adjustment, the thing is plastic and its hard to tell when it bottomed out. Just don't gorrila grip it and you'll be ok.
Oh ya, mine is a 7/32 allen so you don't have to go searching after you get under your truck. There is a little rubber cap over the screw to keep debris out as well, make sure you put that back!

Thanks for the help all.

 

Glad to hear it is not freaking you out anymore.
I am not sure what pressure the switch adjusts to but go with what STS told you.
All that Hoobs switch does is warn you when the return oil pump is not working or is not returning the oil back to the valve cover fast enough. It does not control the flow in any way. Now your return oil flow will have to back up to whatever pressure the switch is set to before it will warn you that oil pressure is building up in the return line. This may force oil by the turbo housing and into the intake or exhaust before it warns you that this is happening.
Did you test your system to see if it is putting the return pump in high speed mode when you are under boost? With the truck running jump the connections on the Hoobs switch that is under the hood by the intake manifold. You should be able to hear the return oil pump switch onto high speed. Ask a buddy to help listen for it if you cannot hear it from the front of the truck. You should be able to hear the pump speed up. Make sure the base of the solenoid next to the Hoobs switch has the ground wire properly attached to it so that your PCV system is bypassed under boost as well.

 

Will do. Thanks for the reply.

 

I agree with Mort, the switch on the oil pump assy is for the alarm in the cabin, not the pump speed. Definitely check whether you are going into high speed else you will get the oil spew into the exhaust and intake.
If you are not getting spew then it could have been as simple as the Hobbs switch at the pump being stuck...

 

Guys I jumped the terminals on the switch and I can barely tell the difference in the sound of the pump when its in high speed mode.
Maybe because the truck was warmed up, and maybe since I was 2 feet awat from the tailpipe while it was idleing.
I know it should sound quite a bit different from low-high speed, I used to hear that before cutting off my cats.
If I turn the ignition on the pump does come on for a second, this is how I've purged the line of old oil after doing an oil change.
Maybe do the same thing and see if I can notice the difference in the pump's sound then?
Does anyone know how many turns out for the hobbs switch to get it back to STS's base setting of 1 psi?
Thinking about going back to the 1 psi setting and putting a switch to manually put the pupmp into high speed mode when I'm thrashing the truck and just click it off while crusing.
I'll post back again if I do this.

Also another thing, everone says the turbo bearings should not be subjected to high oil pressures, how much pressure does anyone think comes out of the oil supply line? Would that pressure be low because of its location, or would it rise and fall with engine load like the location the dash gets its signal for the stock gauge from? 40-65psi I see on my gauge.

 

STS does have a kit to turn the pump on high from a switch in the cab. They make it for vehicles in cold climates because the buzzer goes off due to thick cold oil and the pump on high speed cures that problem. You don't need the kit it is just a switch and some wire unless they will just give it to you because you live in a cold climate in the winter. PM me and I will email you a copy of the instructions if you like.

Adjusting the Hoobs switch may be a trial and error process at this time. Try to remember how may turns you put on it from the original setting. Maybe a call to STS will help out?

I flushed my oil supply line when I installed it and at idle the flow is steady but did not seem to be under high pressure. I was told a nice steady flow is all you want or need. I am not sure how the flow increases with engine rpm.

 

I now do the same thing to purge the old oil, just uncap the engine oil fill with the STS return and let the cap sit in a catch container until it dumps about a quart or a little less just to make sure all the old dirty stuff is out of the lines. I think I'll hook up another switch for the pumpto go into high speed, just for peace of mind. I may be taking off my solenoid valve today and see if that helps or hurts my oil puking issues.
I'll pm you my e-mail, it would help if I could get that from you, appreciate it!
-Tim

 

keep us updated man!

 

How about taping the oil pan for the return oil line.

 

take off the oil filler riser and put your cap right on the valve cover. It seems that the riser didnt seal very well on my truck. But i did keep it on and put rtv silicone arond the base of the filler and it worked great, but i got rid of all that plastic when i got that billet oil cap and have had no problems whatsoever. just stay out of boost till you get home tomorrow night. Pm me for my phone # if i can help you-TIM