Manual Boost Controller (External WG) hookup

Sean Krupa

Sean Krupa

Moderator
I hooked up my MBC according to what Precision said in their instructions. I have a 10-12psi Base spring in the Wastegate. Without the Controller, I get 12psi exactly. With the Controller hooked up the way I have it, it shot up to 20+psi. The controller is all the way out.

Wondering if I have the Hoses hooked up correctly, or if turning in the Knob would make a difference which I doubt, since that would raise boost.

Any suggestions?

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VIPERRACING

VIPERRACING

New member
Re: Manual Boost Controller (External WG) hookup

Sean Krupa said:
This is how I have mine hooked up.
http://photos.imageevent.com/speedywrx/tialgate/websize/ewgsetup3.jpg
Click to expand...

According to your diagrahm, if you have the regulator turned all the way up(turned counter clock wise) you should be running on stock spring pressure. turning the regulator down(clock wise) will increase boost pressure. If you just run it to the side of the gate (nothing to the top) you would have to have the controller turned all the way down which would give you stock spring pressure then turning it cc wise will then increase your boost levels. Hope this helps.
 
nallj92

nallj92

Active member
Re: Manual Boost Controller (External WG) hookup

your spring in the MBC could be too stiff, pull it off and check with compressed air and regulator.
 
blacktyaffair

blacktyaffair

Donating Member
Re: Manual Boost Controller (External WG) hookup

Not sure which way is open or closed, cw or ccw. I would assume open, all the way out, would be ccw. All the way in should give you base boost. Open, or ccw, should give you max boost whatever that is. I am going by the diagram you provided. Hope that helps.
 
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Sean Krupa

Sean Krupa

Moderator
Re: Manual Boost Controller (External WG) hookup

It's a Precision 39mm WG. I have a 10psi spring which gets my 12psi base boost with the Line from the Turbo to WG. The Boost controller is all the way out, which should get my Base boost. It just spikes to 20psi at like 50% throttle.

I've heard nothing but good reviews from the Voodoo 0-30psi MBC which I have. Not sure why it's spiking like this. I mean, how can you mess up a simple ball and spring devise. All the base model MBC's are bascially the same concept.

I have the hoses routed exactly like Precisions instructions.
 
blacktyaffair

blacktyaffair

Donating Member
Re: Manual Boost Controller (External WG) hookup

All the way open would put boost pressure plus spring pressure on the top side of the wastegate which would yield higher boost. Try running in all the way.
 
Sean Krupa

Sean Krupa

Moderator
Re: Manual Boost Controller (External WG) hookup

I just read PTE's instructions again.

With the MBC closed, so that no boost signal pressure passes through it, the wastegates spring rate should control boost levels. Opening the MBC applies pressure to the top of the WG, delaying the valve from opening, effectively raising boost levels.

So it sounds like your right blacktyaffair, I will try that soon.

I'm already getting a taste of Higher Boost. Feels like an animal. I'm keeping an eye on things with Datamaster as I go along with this Boost issue.

Thanks,
 
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blacktyaffair

blacktyaffair

Donating Member
Re: Manual Boost Controller (External WG) hookup

I was trying to find installation and user instructions online but had no luck. I hope you have this thing figured and just take it slow. You should be alright. :tup:
 
Aeroking

Aeroking

e.i.
Re: Manual Boost Controller (External WG) hookup

just do turbo to controller. and controller to bottom port on WG.

images


The diagram using the tee works better for electronic boost controllers with duty cycle.
 
VIPERRACING

VIPERRACING

New member
Re: Manual Boost Controller (External WG) hookup

With the way you have it set-up now, the controller turned all the way up(allows no air to travel through the controller, this goes for any regulator) which should let your truck run on the stock gate spring since your still getting a striaght line pressure fron the compressor housing via the tee that you have installed(regulator on other side of the tee is closed now which is not allowing any air to the top of the gate yet unless you have a bad controller). Once you start to turn down the regulator(turning down"clock wise" on regulator allows air to start flowing through the controller)air will now be sent to both the top & side of the gate. The more you turn it down the more pressure it puts on top of the gate spring which interns increase's boost pressure. I dont think that you need to run it this way. Just run a line from the compressor housing to the side of the gate and put your regulator somewhere in between the compressor and gate. Now with the regulator inline, you will need to have the regulator turned all the way down(controller completely opened) to allow unrestricted air flow to the gate as if it was hooked up without a controller at all(stock air flow=stock boost pressure). Now to increase the boost with this setup you would need to turn the controller"counter clockwise" which will shut the air flow off to the gate which will cause it to increase boost pressure because its not seeing actual air flow. Be very careful and no matter which way you have it set-up, turn it a little at a time, It would also be much easier if you mounted it inside the truck away from all the heat. What you really need to do is take your regulator or get another one thats not hooked up to anything and start turning it in & out and see how it actually works. Its not that difficult. Hope this helps, Good luck and Have fun
 
Sean Krupa

Sean Krupa

Moderator
Re: Manual Boost Controller (External WG) hookup

The way I have it now is like in my 2nd post above from another vehicle. I'm realizing that the pressure source or (helper air) as Jeff calls it is going to the side of the wastegate and also the top of the wastegate and with the MBC open all the way, the pressure source is going up through the ball being that there is no pressure from the spring being that I have it all the way CCW open allowing equal pressure on the top and side of the wastegate hence, causing it to overboost.

I'm going to try and close CW the MBC to not allow any pressure to the top of the wastegate and crack open allittle at a time to reach the boost I'm looking for.

The inlet for the Voodoo is on the bottom opposite side of the adjustment.
 
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Sean Krupa

Sean Krupa

Moderator
Re: Manual Boost Controller (External WG) hookup

Got the Issue resolved. We turned the MBC in all the way, and I got base boost, about 12-13psi. I turned out the Knob 1/2 turn from closed and I got 14psi. We are slowly turning it out with 1/4 turn increments. I'm aiming for 16-17psi and I'll see if that satisfies my needs :lol:.

So far no Knock and the AFRs look good.

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Thanks for all the suggestions!
 
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