General Boost Controller

[spyderdrifter]

I'm not really sure if this should go here, but it sorta makes sense to me. I just bought Ace Hardware parts to build my own manual boost controller based on this diagram...

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My parts...

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How can I determine how much to shorten my compression spring? I don't want to cut it too much and then make it worthless. Only bought one, should have thought about that and bought several. Same question for the bolt.

Thanks.

 

[ThunderChild]

Personally I'd have done a straight fitting and tap for the wastegate nipple, instead of a 90* fitting. Aside from that, the bolt can be as long as you want, the springs I'd set up a crude spring pressure tester with a gram scale and find length/pressure that works for you. Or buy more springs and experiment.

This is another reason why a straight fitting tapped for another npt fitting would be nicer, so you can utilize the longer spring and bolt to its full potential.

Edit: also, they have the one port labeled as going to the bov, when it should go to the charge pipe directly, either at the compressor cover or j-pipe etc.