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General Car Related Discussion.To discuss anything that is related to cars and automotive technology that doesnt naturally fit into another forum catagory.
We recently installed my emerald management in my track car but I have now found what I believe to be a boost control valve of some sort in my many boxes of bits (pic below) as I remember removing it from the previous car and I know it was plumbed in.
My questions are I don’t remember any additional switches in the car that would control the valve so would it just be 1 setting that’s run straight to the ecu? I have the wiring diagram for the ecu and it shows where the boost controller was connected but I don’t know if it went straight to the boost valve or if there would have been a switch or something. I intend on running some sort of 2 stage boost so don’t know if this will or would do the job.
On the ports it has NC, NO, COM and I know only the turbo and actuator where connected to 2 of these.
Really, unless you know what was there before, or what was controlling it...there is no sense guessing.
You need to find out if the ecu was controlling boost in the past or if someone had fitted a boost controller that is no longer there etc etc. But the simple/easy thing to do is use the ecu to control boost, although obviously this will need setup/tuned within the ecu and the engine tuned at all boost levels you will use.
If for whatever reason that is not possible, there are dozens of aftermarket controllers on the market, although most will come with a new valve anyway. The connector etc on yours does look more akin to a Greddy unit.
Connection here shows for a typical 3 port MAC valve. As to whether numbering on your valve is identical, would be up to you to determine. Ignore the block off unused port part. 2 port internal actuators like that arent that common anyway.
Last edited by stevieturbo; Oct 11, 2018 at 09:05 PM.
Thanks stevie. I think it was an aftermarket unit like Greddy as you say but I don’t want to run this so think my best option would be to re install the Amal valve and switch it as this seems to be a popular setup.
Who I’m getting to map it put there own kind of boost controller on it and it’s wired back to the ecu where they adjust it from there so maybe best for me to leave it for now as it won’t hurt to get the car running without any of that.
From what I understand, the Amal valve is a simple fixed bleed via an off/on strategy ( whether manual switch or via ecu ), so it is very limited in what it can do vs a properly controlled solenoid/PWM control where you can map it throughout the operating range of the engine.
So with a suitable controller you could have boost by speed, rpm, gear, etc
But your statement above suggests there is already a form of boost control in place via the ecu, so surely you would have no need for this valve nor an Amal valve ?
Of course...simple can work well too ( with no valves at all, gate only )...really just depends what is wanted or needed.
Last edited by stevieturbo; Oct 11, 2018 at 09:37 PM.
Ok that’s interesting. I’m really struggling to remember how it was set up in the car I removed it all from. There must have been an aftermarket boost controller but I guess unless I remember that’s no help. I think I will leave it for the time being and get the mapper to sort it out. I’m only looking to fire the engine as we have just installed all the new loom and fuel system.
Regarding the text near the ports, the COM will probably mean Common, so it will be the supply line of air (compressor). The NC will mean Normally Closed and the NO Normally Open.
To connect it in a safe way I would expect the NO should be connected to the wastegate and the NC should be open to atmosphere. In that case the valve needs to be actuated to bleed off air in order to increase the boost. Of course the question is also whether the valve is controlled in this way by the ECU. But it probably also needs some restrictors just like the amalvalve in order to set the boost levels.
Emerald ECU does control the boost; Same as my VIPEC, I do not have anything in terms of the solenoid, amal valve, air injectors etc....I also do not have a dump valve, not that this is exactly related.
Regarding the text near the ports, the COM will probably mean Common, so it will be the supply line of air (compressor). The NC will mean Normally Closed and the NO Normally Open.
To connect it in a safe way I would expect the NO should be connected to the wastegate and the NC should be open to atmosphere. In that case the valve needs to be actuated to bleed off air in order to increase the boost. Of course the question is also whether the valve is controlled in this way by the ECU. But it probably also needs some restrictors just like the amalvalve in order to set the boost levels.
With proper boost control via ecu/controller and solenoid/PWM valve, there is rarely any need for restrictors or anything like it, unless there is something badly wrong or mismatched with the parts.
Emerald ECU does control the boost; Same as my VIPEC, I do not have anything in terms of the solenoid, amal valve, air injectors etc....I also do not have a dump valve, not that this is exactly related.
you have a dump valve and solenoid on the nose of the turbo.
Cosworth boost controller help?
