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Slightly restricted wastegate opening

Boost Control

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I've made an downpipe adaptor plate which unfortunately interferes with the full travel of the wastegate arm. Have milled a clearance channel which improves the situation but the flapper can still only open 30 degrees. I've got a feeling that will be enough and probably doesn't open much more than that in normal use (and probably pretty close to max flow too). Anyone experienced similar and had favourable result or mega boost creep? And of course there are lots of other variables. I'll find out soon enough!

Unfortunately the only way to find out will be to run the engine and test the boost control. The amount of wastegate opening you'll need will depend on the whole turbo and engine setup as well as the size of the wastegate.

Hey Andre, What are the pros and cons for welding a wastegate flange or installation of the wastegate onto the turbine housing of the turbocharger?

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Hi Kevin, the upside with this approach is that it can provide quite a simplified installation in some instances and the flow off the turbine housing is pretty close to ideal so boost control should be excellent. the downside is that you will need to weld to the exhaust housing and there can be some complexities around material compatibility and filler rods. While it can be done reliably, you need to use a welder who knows what they're doing or you're likely to have cracking issues down the track.

Hi Andre, thanks for the reply.. This helps a lot.

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