Do I need an oil line restrictor

[Pasquin]

Do I need an oil feed line restrictor on a mitsu 20g, I want to run my feed line from the filter housing. I ran my 14b just fine from the filter housing with no restrictor i just wanted to be sure I'm not going to mess the new turbo up.

 

[Pasquin]

Ya I'm going to try it from the head because I'm having the same problems I had with my 14b it will spike 15 and then drop back down.

 

[dsmmike50t]

No. You only need a restrictor for the hx40 if you're not running b-shafts. the hx tubos can handle any pressure a *journal bearing* garrett can handle. I'm feeding my h1c and several others are feeding their holsets with no restrictor and b-shafts.

If you have no b-shafts is when you need to look at getting a restrictor. MHI turbos don't mind oil from the oil filter housing as long as pressure isn't over stock. They are designed to operate on oil pressure from the head; much lower than at the filter housing. I've had more than several MHI turbos blow oil past the shaft seals with a 4g63 with b-shafts removed.

Your spool can suffer from more oil pressure. . . Don't you have a stock 14b oil feed line?

I have a b-shaft removal kit installed but I didn't know that a restrictor was only required when the b-shafts were removed.

 

[dsm-onster]

I've blown oil out of my 18g seals with a 7bolt with the b shafts removed and feeding from the oil filter housing. A restrictor is not neccesary because you should feed your MHI turbo oil from the head. Some may not have a problem, but that doesn't mean that its the right way. It failed to work properly for me and others. Yet, if you feed an MHI turbo from the head there will be no chance of that issue.

 

[JusMX141]

I'd feed Garrett Hybrids from the head as well if I were running one of those.

It's my firm belief that certain turbos were designed with a certain oil source in mind. If you look into the oil supply for a Mitsu CHRA (designed to pull from the head) you'll see a hole that is barely big enough for the tip of a ball point pen to fit through; if you look into a Garrett T3 CHRA's oil supply you'll see a hole about the size of a drinking straw at the bottom.

Now I don't know much, but if you go pulling your oil supply from the filter housing for a Garrett, then at wide open throttle you'll be blasting oil into it not unlike a fire hose would extinguish a warehouse fire. There's no restriction....so I've been telling my Garrett customers that if they plan on pulling their oil supply from the filter housing they'll NEED a restrictor- not necessarily a pressure restrictor (as would be needed for a Ball Bearing application) but a volume restrictor. This after I've had a handful of guys return their freshly-rebuilt Garrett T3 turbos to me complaining of oil useage....all being pulled from the filter housing.

I started a thread regarding this issue on the "Turbo Tech" forum simply because I've heard so many different things mentioned about where to get your oil supply for various turbos.