I have a t4 Garrett that is off of my car right now for rebuild and I wanted to drill and tap the compressor housing for a barbed pipe fitting. Problem is that there is no boss or pad to drill into. Its just plain casting thickness all the way around. I don't have calipers that can measure where I want to tap it but my fingers tell me its between .150"-.200" thick (prooly closer to .150"). I don't wanna drive a fitting into cast aluminum and it turn to mush... Has anybody drilled/tapped their housings out with any luck? Any vendors wanna chime in here ?

 

I did my master power that way without hesitation(drilled and pipe tapped). I blended the fitting on the inside of the housing as well.

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yea i tapped/drilled mine without any hesitation

 

Went ahead and drilled and tapped that housing. Pretty damn beefy in that area.
You guys were right. Definitely plenty thick.

 

i was just thinking about this thread over the weekend, i was polishing my comp housing and it was like midnight when i was putting the fitting back into it. so i got it started and looked down at it and it was all cross threaded! i did manage to get it out and fix it put, but geez

 

I used a loc tite pipe thread sealant on mine and kinda wish I would of just used tape. I don't know how hard that sealant gets. I hope it doesn't pull the threads out!

 

what is the reason for putting a fiting on the comp housing?

 

To run wastegate signal off of it. I was running it off of intake manifold.