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Old 01-17-2015, 05:21 PM   #1
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Default TD04 oil feed

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
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Old 01-17-2015, 05:58 PM   #2
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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.
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Old 01-17-2015, 06:03 PM   #3
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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.

Last edited by DNMakinson; 01-18-2015 at 02:30 PM. Reason: I had incorrectly stated 1.0mm restrictor
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Old 01-17-2015, 10:54 PM   #4
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yes, oem subaru td04's do use a restrictor
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Old 01-18-2015, 07:27 AM   #5
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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.
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Old 01-18-2015, 12:51 PM   #6
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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.
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Old 01-18-2015, 02:30 PM   #7
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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.
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Old 01-18-2015, 04:41 PM   #8
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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
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Old 01-22-2015, 12:30 PM   #9
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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?
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Old 02-01-2015, 10:45 AM   #10
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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
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Old 02-21-2015, 01:58 PM   #11
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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
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