Been trying to sort my boost controller lately but when doing so, I noticed the vac/boost piping that goes to the controller is 6mm but the piping that goes to the external wastegates is 8mm. So there's a reducer/expander in there. I'm just wondering if this matters at all or if it's too small to make much difference.

It won't matter.

The controller is reading vacuum, not the flow rate of vacuum.

You will obtain a steadier reading with a smaller diameter hose than a larger one.

The controller is reading vacuum, not the flow rate of vacuum.

 

How does a vacuum flow?

Sorry, maybe I just have been clearer here. The piping in the the solenoid of the boost controller is 6mm. It the comes out of the controller as 6mm and then changes up to 8mm before it reaches the external waste gates.

What does the manufacturer of your EBC specify - installation instructions?

 

My HKS EVC install uses 6mm piping from the EVC solenoid to straight coupler to the stock piping to the wastegate actuator.

(I don't know off hand what diameter the stock piping is). HKS specify 6mm for external wastgates as well.

Thanks Andrew. The Greddy profec bspec 2 says 6mm piping. The turbos are Greddy TD05 16G with the Greddy/Trust external wastegates waste gates. The start of the manual for them is foreign but looks like its saying 8mm and that's certainly what's fitted which is why I had to use a reducer/expander thing. I'm just wondering whether the wastgates will be getting enough or the right pressure through the solenoid or whether it'll be hardly noticeable different etc

c)

c)

 

What do you mean? Or is something missing?

Sorry, I'm suggesting your third option - "it'll be hardly noticeable different"

How does a vacuum flow?

 

Well.........

 

A vacuum is relative to ambient air pressure also known as Gauge pressure. Ambient air pressure is 1 bar when referenced against a perfect vacuum also known as Absolute pressure.

 

So if you have 0.6 bar vacuum on you gauge, relative to Absolute pressure you still have 0.4 bar of pressure to flow.

 

So it’s correct to say that a vacuum can flow.

 

Hope this make sense :wacko:

Sorry, I'm suggesting your third option - "it'll be hardly noticeable different"

 

Pmsl... I thought that was possibly what you mean but... You know I'm dumb right

Hope this make sense :wacko:

 

Perfectly! Thank you.