Dual Stage

d3x

d3x

Member
The instructions says connect it up as per the left image. However the bleed valve will remain open when running low boost which is a insignificant but unnecessary air leak. I connected it up as the right image which eliminates the air bleed when running low boost. What I want to know is there a reason not to use my schematic?

Black = pipe layout
Orange = High boost flow
Red = Low boost flow
Square = 3 port solenoid

20-05-2012%207-44-56%20AM.png
 
i read it and i was like yep..........

maybe label the things the pipes are going to, i can tell 1 is a turbo, one is a waste gate, thats about it
 
I am one of the 28 that read it but I don't know the answer, no point giving you incorrect or useless information just for the sake of it.
 
Res said:
i read it and i was like yep..........

maybe label the things the pipes are going to, i can tell 1 is a turbo, one is a waste gate, thats about it
Click to expand...
The rectangle is the solenoid with 3 ports in, out1, out2. the other item is a manual boost controller or 'boost tee'
 
Hook up the manufactures way, and port the bleed into the intake pipe (that comes off the compressor housing)

Thats how mine is
 
Surely by tapping the bleed valve back into the pressure source it won't bleed hence defeating its purpose.

Can you see anything wrong with my layout
 
I think that is a different kind of setup to mine. That/urs bleeds air going to the wastegate in order to alter boost. Whereas a mbc will use a spring to delay the signal to the wastegate. The purpose of my bleed valve is there only to increase the sensitivity of the mbc slighlty improving turbo spool response.ie keep the mbc valve only open at the threshold of the designated boost setting.
 
oem 2 port solenoid (bleed type) is rubbish.

3 ports are a lot better.

Ill look at this diagram of yours later.
The drawing gives me a headache.
 
Can you explain what parts you are using?
your diagram is not clear.
I dont even know the the hell im looking at so you think anyone else on here can help you.
I suspect you are using some kind of ball and spring boost controller with a vent hole.
If you are using a good 3 port solenoid, most have good control, some better than others then throw the MBC in the bin.

What are you using to control boost?

Edit:
seriously mate if you are using a 3port solenoid.
Why the fudge are you using a manual boost controller as well.
A 3 port solenoid can be controlled perfectly with the right device. With a good ecu that is all you need.
Using an MBC creates problems that a good EBC setup is there to solve.
Things like high rpm boost taper (boost drop off at high rpm) and higher boost in higher gear.
If you want flat like a ruler boost control and consistent boost in every gear you using a 3port in a closed boost boost control setup.
If you dont want to tune the ecu to control boost parameter etc then go guy a good off the shelf EBC like Turbosmart eBoost2.
 
-.-


I am NOT using an ebc, or any form of pulsing closed loop boost control system. I am using a DUAL stage boost controller....surely you know what that is. If not google dual stage boost control


Yes its a ball and spring...the whole boost control is controlled via springs for both settings. Reasons being it is cheap (less than 100) and allows me more flexability at what boost levels to run (I.e low/standard boost during break in only and then controlably ramping it up)......

I'm not concerned about boost taper and fancy control systems as this turbo will def not rut out of puff well I'm getting started. Moreso just looking for adjustability
 
So what Dual Stage boost controller are you using? Turbosmart?

How is high and low boosr selected?
 
I'm using turbotech solenoid and tee. Low boost is the 8psi ewg spring. High boost is whatever I set the tee at. The vent/bleed valve in my tee as said increases sensitivity and as a result helps flatten the boost level/taper a bit
 
Yes ive used the turbotech boost controller more than once on many turbo builds so I know all about the boost controller you are using. Ive seen that article when it came out 7 or 8 years ago.
Its a good boost controller but like I said if you ecu can control boost you have an electronic boost controller right there for the price of a solenoid, hoses, and a few wires. thats still within your budget and has better control.
Then use the ecu to adjust the duty cycle of the solenoid at rpm intervals.
Even if you dont use closed loop you can use open loop electronic boost control.
You see the spike you get using an the MBC which is normal. This can be quite annoying once you start running higher boost. If you want 16psi at 6000rpm expect it to spike to 20psi.
You can control the spike, taper and boost level so you are getting the features of a $600 EBC for under $100.
Im still a fan of that Turbotech ball and spring boost controller since it it so cheap and ups the boost on a stock turbo car with ease.

All I can say is the Megasquirt ecu and a 3-port boost solenoid will piss all over any control of a MBC.
But requires more time and ecu tuning for initial setup but thats easy.
I run a 3-port solenoid to replace the 2-port solenoid. Control is awesome and using the stock EVO6 ecu retuned to what ever boost level or charactistics I want. If i want boost to come on at 5000rpm you can tune it to do that.

But hey whatever floats your boat if you think its better or suits your needs, or easier to setup then what can i say.
You have excellent features of the ecu at our doorstep. Up to you to use them.
 
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