External wastegate

[haggis]

Thinking about designing external waste gate / relief valve for my glanza. Do you block off internal waste gate ? Also where abouts is best place to fit wastegate?

[AdamB]

Yes you need to block off the original internal wastegate.

Best place for them is off the merge collector on the manifold, no sharp bends it should have a nice radius flow to it, otherwise it will cause all manor of boost control issues.

[haggis]

In terms of boost control could you not just plug a relief onto the same pipe as BOV? If your venting to atmosphere is it not the same thing

[AdamB]

That's what race engines do is actually use BOV's to control boost pressure. That's beyond the scope of a road motor though tbh.

[haggis]

How come ? I think it would be easier to tap into the intake with a relief

[TrisK]

Because it can cause issues with over spinning the turbo

[haggis]

Oh okay I thought it was mabey to prevent overpressure of turbo as the engine must also create pressure on ignition and to expell the hot air rather than intercooled air.

[haggis]

How do you block of internal waste gate?

[AdamB]

Weld it.

[haggis]

Sound

[Androo26]

You dont have to weld it.... you may want to use it again or on another project. Here is what I did.

Weld a nut on the back side of the flange and use a bolt and locking nut to hold the door closed.

Here is the external gate setup that I made for some inspiration.

[haggis]

That is sick work my friend