np89 Posted February 16, 2016 Share Posted February 16, 2016 I wanted to start a thread here to see what sort of oil feed lines the single guys are running. I have a Boost Labs S366HF (journal bearing), the previous install (which we will not go into right now) had an oil feed line which was somewhere between a -4 and -5 line apparently according to Faye at Speedflow when I sent her it. I was in contact with the guys from Boost Labs and they reckoned a -4 or -3 line would be fine for my turbo and steered more towards -3 as they find the -4 can sometimes feed too much oil to the turbo and therefore -3 should be fine. So I got Faye to make me up a -3 line and currently am installing that. The reason I am asking is actually just after looking at Gaz's thread this morning and seeing that his oil feed line looks significantly bigger than mine and I wondered why. What is the general opinion on the size of an oil feed line? Quote Link to comment Share on other sites More sharing options...
Lee P Posted February 16, 2016 Share Posted February 16, 2016 Oil feeds are usually -4 Quote Link to comment Share on other sites More sharing options...
np89 Posted February 16, 2016 Author Share Posted February 16, 2016 Oil feeds are usually -4 Do you think a -3 line will restrict the oil flow too much? I just went on the manufacturer recommendation but now im a bit worried :/ Quote Link to comment Share on other sites More sharing options...
Lee P Posted February 16, 2016 Share Posted February 16, 2016 Do you think a -3 line will restrict the oil flow too much? I just went on the manufacturer recommendation but now im a bit worried :/ If they have recommended -3 I'm sure it will be fine Quote Link to comment Share on other sites More sharing options...
np89 Posted February 16, 2016 Author Share Posted February 16, 2016 His exact words were: "We normally run -4 on the 2JZ GTE but in certain cases it flows a little bit too much. I believe the -3 will be sufficient." "You need 1/4" NPT to -3 or -4. We've ran both without issues, but it all depends on the application. I would not suggest an oil restrictor" Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 16, 2016 Share Posted February 16, 2016 Well, if he says a -4 hose can supply too much oil and to use a -3 he *IS* effectively suggesting an oil restrictor. Most OE turbos use hard lines and they are the equivalent of a -4 braided hose. Quote Link to comment Share on other sites More sharing options...
np89 Posted February 16, 2016 Author Share Posted February 16, 2016 Well, if he says a -4 hose can supply too much oil and to use a -3 he *IS* effectively suggesting an oil restrictor. Most OE turbos use hard lines and they are the equivalent of a -4 braided hose. Mmm well yes i suppose that is true. As long as it flows enough oil so as not to kill the turbo I will be happy. Have already had one dead turbo, definitely do not need another!lol Quote Link to comment Share on other sites More sharing options...
Mk4Gaz Posted February 16, 2016 Share Posted February 16, 2016 Yep, - 3 is what you want. I bought an oil line kit from the usa, that came with a - 4 and a restrictor, to reduce the oil pressure Quote Link to comment Share on other sites More sharing options...
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