Dobs

Hey guys, i'm in the process of building my turbo car.

I have a BEGI kit wich is second hand, I think it was previously on an NB but i own a 94 NA

Since I own a 94 NA, my oil feed is different from the previous owner so i wont be using the same setup.

I installed a -3an fitting on the engine block where my stock oil catch is on the 94-95 models. But I just checked the fitting on the turbo itself and it seems to be a -4an.

So here is my question (i'm new to this).

Do i have to change the -4an fitting on the turbo and put a -3an ? I mean, coudlnt i just put a -3an female fitting on a braided hose for the engine block and a -4an female fitting on the turbo and put a line inbetween, the flow would already be small since the entry of the line is a -3 right ?

Or am I all wrong and i need a -3an fitting on the turbo too. Thank you

Savington

iTrader: (31)

Depends on which turbo you have and whether or not the unit has a restrictor.

Dobs

i'm not 100% sure, But i think its a garrett 2560r

shuiend

iTrader: (24)

1. Remove -3an fitting from the block.
2. Install -4an fitting in the block.
3. Install -4an line.
4. Profit.

patsmx5

iTrader: (16)

+1

Savington

iTrader: (31)

Unless his GT2560R doesn't have a restrictor, in which case that's a recipe for epic fail.

shuiend

iTrader: (24)

I have zero clue what turbo he is running, but I know no one running -3an lines for oil feeds. I have always seen -4an lines for Garrett turbos and -6an for EFR's.

It just seems way strange to me to go get a fitting to change the turbo feed to -3an instead of just changing the fitting on the block to match what the turbo already has. Running a restrictor to me seems to be independent of the line size, but more based on what turbo you are using.

Dobs

Well according to this :

Oil Feed and Return - Miata Turbo FAQ

I needed a 3an fitting.

But anyway, just because sourcing parts was being a hassle (live in québec and not every supplier ship to canada quickly/cheaply) and because i still needed a brand new line, I decided to order the appropiate kit from BEGI, the line and the fittings, so the hassles are over.

Do it once, do it right.

AdrianD2

So what you are saying is, I should not run -3 for my 2554?

Savington

iTrader: (31)

EFRs ship with a -4 inlet fitting, so I suspect most people are doing that. In any case, an unrestricted -4AN feed line to a ball-bearing Garrett turbo is going to cause issues. BTDT.

shuiend

iTrader: (24)

You are correct about the EFR. I had misread the instruction in the box that mine came in, it is the water lines that are -6an.

I have always just bought the -4AN fitting with the restrictor from ATP for my garretts so that was my bad on that over site.