RESTRICTOR VALVE
Turbo Mini Forums

Hi All
During the time I have been studying the ERA microfiche I have seen a couple of things I am not clear about.
It shows a restrictor regulator valve to non return valve (TAM 1107 part number)
This is a small plastic restrictor that sits in the neck of the vacuum valve in the inlet manifold. This valve allows the vacuum for the brake servo and it pulls in fumes from the crankcase breathers it is also connected to the inlet pipe to the turbo.
Now.
What is its effect on the engine/carburation?
What happens if it is removed on a normal set up?
What happens if it is removed on a performance set up?
I have my own ideas but they are probably wrong.

It allows the breather system to function without the breathers being pressurised when the engine is on boost (positive pressure in inlet manifold).

The one way valve allows extraction from the crankcase when the engine is not on boost (vacuum in inlet). When the engine comes on boost, this one way valve stops pressure getting back up into the breather. Then the red valve allows extraction from the breather by the pipe going into the inlet to the turbo.

All this works well if all components are healthy, not sure really why you want to alter it if its working, I would leave it alone personally.

No I haven't made it clear sorry.
It is the restrictor regulator valve to non return valve (TAM 1107 part number)
My car doesn't have one fitted,The restrictor that is. Someone probably took it out.
Wouldn't that weaken the mixture because without the restrictor more air will be drawn in and cock up the standard setup?

Mine was missing this very item, so I made one out of brass. Fitted it, and noticed not a jot of difference in the way the car drove. I suppose it could have altered the mixture in a way that was undetectable to my backside dyno, but I didn't have an wideband fitted at the time so I couldn't say for sure.

http://www.triple-m.co.uk/phpbb/viewtopic.php?f=7&t=2751

So then removing the restrictor allows the mixture screw to be turned richer for boost.
When not under boost a normal mixture because more air is being drawn in.
Have I got that right

As my car didn't have one and if I build it to normal spec and don't use one, for a little more power it needs to be a little richer.

Hmmmmm Not sure.