Internally gated turbo, External gate

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12-15-2007, 09:58 AM

#21

Ben

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Nice. Mine will be the same thing, but with an ugly weld. This explains your EWG question.

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12-15-2007, 10:03 AM

#22

soflarick

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Yup, still quite a learning curve for me with this turbo stuff. My experience has been with centrifugal and positive displacement blowers.

How much can RC 550s support, 300rwhp? I've got the fuel pump and rail to support things, so I figure if I need a bit more I'll invest in an adjustable fuel pressure regulator to bump the base pressure a little.

12-17-2007, 07:40 AM

#23

fmowry

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I used flat stock and drilled a hole for the flapper nub then bent it to bolt it to the WG bolt holes on the back side of the compressor housing. Worked fine. This was on my Forester running a slightly bigger than 20G turbo.

I vice and a drill and 15 minutes. Doesn't get easier than that and is fully reversible.

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12-20-2007, 08:24 PM

#24

Ben

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Quote:

Originally Posted by Ben

[Y]ou mean like a bolt that threads into the flange on the downpipe and contacts the flapper? If so, that's makes things easy[.]

Well, what do ya know? Note the big 14mm bolt that threads through the turbo flange on the downpipe, and contacts the internal wastegate flapper, preventing it from being able to swing open.

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12-20-2007, 08:45 PM

#25

Aaronblue05

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Quote:

Originally Posted by magnamx-5

A disconnected WG boost source will do what you want there ben the Can will keep it shut well into the 20 psi range or until you get a real non internal WG turbo.

He's actually right. The reason an internal "creeps" is because of the actuator. If its hooked up, its going to see pressure and sometimes 'creep' open a little early. If its not hooked up to a positive pressure source, you have a spring holding it shut, and the more pressure in the turbine housing, the more tightly it is pushed shut.

Imagine a front door that opens INTO your house. Now pump your house up to 5psi. You are not going to be able to open that door.
Kinda weird analogy I guess, but shows what i mean?