So i am ready to do my oil feed line and I get mixed answers about what size line I should use. Iv read older threads on HT and there are alot of mixed answers. I emailed Bill at BEP and he says to use a -4AN line. Iv seen ppl have problems with too much and too little oil pressure from both -3 and -4 lines. I dont want to starve the turbo of oil and I dont want have too much pressure and see oil seeping out from the inlet or exhaust side. Any bodys opinions and experiances would be great. Thanks.

Its a topmounted S366

 

-4
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We never deal with bill but another guy forgot his name but.... He sent us a oil restrictor to use with out s372r's and 74r's etc... And of course use a -4 line.

 

^^Yeah but you have had trouble with oil seeping out your inlet side too...right?

Ok well not to say who is right and who is wrong here but Bill from BEP said a -4 and Stan from Fast-Turbo said to go with a -3 because Hondas produce plenty of oil pressure...which is true. I know both of these guys know what they are talking about...maybe its just one of those things that maybe one way works for some ppl and not for others. What do you guys think?

 

ive been running -4 on my s372 for a while now. I thought about going down to -3 though.

 

-3.5

 

i had -4 with my s372r and it had a ton of oil seeping out! I would at least try to get a restrictor if you are going to use -4. That's what i plan on doing next just because i already have the line. If not, i would probably run a -3...

 

I have been thinking about finding out if the restrictor is really needed, its hard to trust what alot of companys say these days. I do have some oil seeping out of my inlet side, but my turbo have as alot of abuse also... I dunno but if the restrictor is wrong I would for sure like to what is right and what is wrong.

 

yeah. if you find out what restrictor is needed you should let me know! haha The inside of my compressor cover was nearly coated black from all the oil seeping. I only had a few thousand miles on the turbo, low boost only(15 psi)

 

If you had the correct size restrictor, would it the size of the line make a difference?

 

As long as your return line is big enough (-10) and straight as possible youll be fine with a -4. What Ive learned is Journal no restrictor, ball bearing put one on.

I have a 42R journal with a -4. I was having seeping in my inlet because of my return line. I changed it from curve to straight never had a problem.

 

no it would not make a difference... you would be fine with either line.

 

Luserkid is correct..if the turbo is ball-bearing you should use a restrictor...if its standard you should not..but you shouldnt need more than a -3 line

 

 

I used a -4 feed line with my s372 and never had a problem. I'm running a topmount manifold so my oil return line doesn't have any bend in it.

Steve

 

I think I will just go with a -3 on my 366... and go from there.

 

I would contact Bullseye and find out what the ideal pressure is at the oil inlet. Then find out how much pressure you have at your feed line, and then adjust accordingly. If you have pressure numbers to go off of, a little bit of math will go a long way. I would go with the -4 feed line, and if it's pumping too much oil, you can reduce it with the appropriately sized restrictor. If you use a -3 and it's not enough, there's no way to increase the pressure via restrictor(hence it's namesake).

 

I believe that all of the t4 Borg Warner turbos call for -4 Feed lines, I am not sure about the 366 though. As others have said previously the Journal bearing turbos generally will want more oil and the ball bearing turbos need a more precise less amount of oil. If I were you, contact Borg Directly and see what they say. (For what its worth, I run a -4 Line on my s368)

 

Who all here is running S366....chime in...what size line are you using? Any suggestions or ran into any problems?

 

There's enough info here to come up with an answer.. -4 is fine, make sure your return is damn near perfect.