I'm running a -4an line straight to my t3/t4 and I need a restrictor. Im gonna make one out of 1/8 npt coupler and female part. Im gonna weld it solid through the coupler and then drill out the right size of restriction. I've read that .055-.065 is where it should be. What would be the conversion for standard or metric drill bits??

 

if the turbo isnt BB u shouldnt use a restrictor. u can ---- the turbo up if you do.

only if its like 10 years old and smoking like a bitch should you use it..

 

It's only 4 months old and non-bb, but I can see where oil is starting to coke on the exhaust side where you clock the turbo. It looks like oil is starting to push past the seals.

 

i drilled mine with a 1/16 drill bit...

 

I personally took my fitting that had a .171" size openning, bashed it a few times with a small mallet until the hole was pretty much closed and redrilled it with a .050" drill (7/64th I believe)

Got rid of my turbo smoking

This was from running on a d16a6 with 70+psi through a -4 line, my new turbo just didnt like it and smoked, i closed the fitting and it stopped smoking

BTW- I didnt use a "restrcitor", I simlpy bashed in the fittng that connects to the turbo

Pretty dam easy, and your snail doesnt need a heck of a lot of pressure to keep cool, probably 12-18psi

 

yea with mine i tapped my fittin..then threaded in a machine screw...drilled a 1/16 hole in the middle of the screw then grinded the head of the screw off and threaded my oil line back on...home made oil restricter