Hi, I have a mk1 eunos and im installing a TD04L from a subaru on my 1.6. I have a -4AN steel braided oil feed pipe but was unsure whether it needs a oil restrictor.
do TD04 turbochargers need a restrictor, I was told journal bearing turbos wont need them but it wasn't a reliable source
can anybody help me?
thank you in advance

 

Can't speak to that specific turbo, but the TD04H-15 used to be quite popular on the Miata (it was used in the Greedy kit) and we ran them without restrictors.

 

Sturovo, who supports lots of TD04 installs, counseled me to do so. I used a 1.5mm restrictor built into the -4AN adaptor at the CHRA and have had no issues in about 3k miles.

 

yes, oem subaru td04's do use a restrictor

 

Good info Joe and David.
I think it should be possible to run the run the Subaru 13t without a restrictor looking at the CHRA oil ways.



The pathways to the bearing and thrust surfaces are small (~ 1-2 mm) and once the oil reaches the shaft the clearance for the oil to escape is tiny.

I tested the oil flow through a TD04 with and without a restrictor and there was no significant difference. As Vlad pointed out Subaru use a 1.5mm restrictor with this turbo so for peace of mind I use one also.

 

that's great news! thank you everybody! just bought a 1.5mm restrictor, hopefully should arrive soon!
I was told that a 3AN line I wouldn't need a restrictor but because as im running a 4AN id need one
I was told this from a local mechanic but ive seen his work before and I didn't trust his advice on this.

 

1) I will edit my post. I looked, and I also used a 1.5mm dia restrictor / adaptor as well, NOT 1.0mm
2) I think you made a wise choice to use a -4AN and restrictor rather than relying on tubing size and length.
3) Sturovo, thanks for the further research.

 

Yeah I assumed you ment 1.5mm because 1mm are for ball bearing turbos and 1.5mm for journal bearings which is what TD04s have

 

just a quick question everybody, I received my restrictor today and the turbo is no longer burning ANY oil so im happy however there is a leak I cant figure out why.
I bought a
M10x1.5 1.5mm restrictor adapting to a 4AN fitting perfect for the oil feed line to attach to, however it is leaking I believe from where the pipe joins the fitting. and ive tightened it as much as I dare but its the same.
Is there anything high temperature I can apply to the threads to seal it?

 

im putting my oil line together for a td04 and thought i post this. this will fit the block on 1.6 setups.
Adapter Fitting M10x1 5 w 1 5mm Hole Subaru TF035HM TD04L TD05H Turbo Oil Feed | eBay

 

thanks guys, I fixed it in the end, I fitted the restrictor just before the turbo and all is good I have a
Block has a m10x1.5 with a 4AN adaptor > 40cm 4an pipe > 4an fitting to m10x1.5mm with a 1.5mm oil restrictor fitted right ontop of the turbo