That little hole on the compressor housing - wastgate?

[4felix20]

i've noticed on some garret compressor housings, they come already tapped near the outlet/discharge hole. does anybody know what size thread or hole that is? i know for a fact that 1/4in is too big. i'm gonna try 1/8inch next..

what i'm trying to do is find something that i can screw into there so i can feed my wastegate the vacuum signal. is that signal too close? should i get vacuum from farther down the piping?

basically, i need something like this little brass fitting in this pic.

[scarboroughdub]

its 1/8 npt

[4felix20]

thanks!

[98240]

Are you using external wastegate?

[4felix20]

yeah

[98240]

That would be cool if it would work because then I could use the same place for my wastegate.
Modified by 98240 at 5:33 PM 2/26/2006

[emperor_lunchbox]

is that a viable option?I am not questioning your idea, I was just wondering if that would be a good option.

[4felix20]

well, i know that little fitting is used for internal wastegates. i don't see why it wouldn't be a good option for external wastegates...but that's why i'm asking here. i just wanted a 2nd opinion.

[Chezedik]

Yes, it would work, but then your WG is going to run lower gauge pressure than you want due to drop across your intercooler.

[C-Kwik]

This is the safest place to source the boost signal for a wastegate. This is the reason OEM uses it. It pretty much eliminates boost spikes and the resultant heat. But, it also increases boost response time (slower - it will hit max boost slower) as it will cause the wastegate to start opening slightly sooner.

[4felix20]

i see. thanks guys. that slow boost response can be cured with a boost controller though, right?