im having a smoking issue with my new turbo and i read somewhere it could be related to the -4an line i ran.

the oil drain has already been custom made and is directly pointing down. has anyone ran into this, and what could be used for the resrictor.

Is your turbo BB? If so, then you should be using a restrictor. The BB type turbos don't require as much oil flow as standard ones. We had this issue on the Falken FD when we went from the KKK bushing turbo to the Garrett GT35R. Garrett says to run the restrictor for all their GT series turbo's.

atpturbo.com sells the restrictors.



you should buy a couple, and work from the biggest size down, once it stops smoking itll be fine. you dont want to over-restrict it, thats why thats the safest way to do it, unless you know the exact size you need.



kevin.

yes it is a turbonetics bb 60-1. is there any way to tell if it is not getting enough oil?

if it blows up early.



kevin.

Not sure but i think he wants to find out before that happens, maybe its just me.

I completely agree with Kevin. Gradually reduce the oil flow until it stops smoking. I can't imagine there's a reliable way to predetermine what size restrictor to use.

The best thing to do is to call Turbonetics and ask them what they recommend.

Funny thing about that, I had called Turbonectics numerous times and asked them about what size restrictor to use with my BB t66.



Each time, there was a different answer...Either it was



"don't use one" or

"you will just have to test it" or

"We have no idea" or

"See what other RE guys are doing"



https://www.nopistons.com/forums/pub...1047683664.gif

yea see the only way to do it is with a gradual decrease in size.



sucks but hey gotta do what ya gotta do.



unfortunately theres no way to know if its too small unless it overheats (if its oil cooled) and well then its garbage.



kevin.

Seriously? Wow...another reason to add to my list of why we use Garrett products I guess.



I'll talk to my friend that runs the Turbonetics R&D dept tomorrow if I can get ahold of him to get a straight answer. That doesn't seem right to me to give different answers LOL.

it sorta relies on the car and what oil pressure its pushing, so theres not always one specfici size, sorta gotta see how it goes.



altho mos tpeople dont up their oil pressure it seems so maybe they have a general rotary one for him.



kevin.

i contacted atp turbo and they only have one restrictor for a t-series turbo, and it does not say what size it is.

it really depends on where the feed line is coming from, if your running a sandwhich plate or something, its seeing full engine oil pressure, which is like what 50-60 at ilde and maybe 80-95 at wot. BB turbos typically like no more than 45psi before it starts pushing its way past the seals. JGSturbo.com has them with a -4an to 1/8npt and it comes with three jets .05 .042 .035