Jump to content
SAU Community

Recommended Posts

Does nissan put in oil restrictors to the turbos on the n1 engines? I have changed from a standard block to an n1 and am using n1 oil pump with 34 n1 turbos. connecting this all with my standard r33 gtr oil lines. All im looking to know is that when a r33 or 34 n1 rolled out of the factory were they fitted with oil restrictors..?

Good question! Can I also add to your question by asking who makes said oil restriction kits if the N1 blocks don't already have one fitted?

Tomei...contact Ian @ Hi Octane....or in QLD Mark @ Godzilla Motorsport.

Edited by DiRTgarage
Does nissan put in oil restrictors to the turbos on the n1 engines? I have changed from a standard block to an n1 and am using n1 oil pump with 34 n1 turbos. connecting this all with my standard r33 gtr oil lines.  All im looking to know is that when a r33 or 34 n1 rolled out of the factory were they fitted with oil restrictors..?

What oil restrictors are you talking about?

The one between the block and the head?

The N1 blocks we have received did not come fitted with oil restrictors, you have to fit them.

Or the restrictor in each tubo oil inlet?

The new R34 N1 ball bearing turbos we have received did not come fitted with oil feed restrictors, you have to fit them. Used ones did.

:) cheers ;)

All BB turbo's require a restrictor of some sort.

Or else the turbo will get to much oil and blow seals etc.

The restrictor is usually in the banjo fitting on the oil lines running to each turbo.

Hope thats what you are asking.

  • 1 month later...
All BB turbo's require a restrictor of some sort.

Or else the turbo will get to much oil and blow seals etc.

The restrictor is usually in the banjo fitting on the oil lines running to each turbo.

Hope thats what you are asking.

Just found this post when doing a search on a question that I'm looking for the answer to. It's essential to fit an oil feed restrictor to the turbo, but is the one i have purchased in the link below suitable for my GT30/40R?

http://www.himni-racing.com/index.php?main...products_id=508

(in my setup, i'm using an N1 oil pump on an rb25det)... If this is installed, is it still essential to put a restrictor in one of the two oil feeds on the block, going to the head?

Edited by silman

Im pretty sure all BB turbos (genuine ones) from garrett and hks have inbuilt restrictors. Therefore no need for this restrictor for your "mismatched laggy" gt3040r. Disco could confirm this. Let us know how this turbo goes cause apparently, they are laggy :no:

Please take the time to read my post carefully and reply only if you have information relating to this question. There's a lot of talk about GTBB turbo's having restrictors inbuilt that's clear from the amount of threads on the board. My post clearly specifies though, that I have an N1 oil pump, and i have this external oil feed restrictor.

Sydneykid or someone with first hand experience, can you please confirm that with all RB engines, is a restrictor on the block still required if a 1.5mm turbo oil feed restrictor for the turbo is in place? (1.5mm in my RB25 application). Does the location of the restrictor make a difference to oil starvation at the sump? Or does the restrictor HAVE to be installed in the block, leadng to the head ONLY? cheers.

Edited by silman
Please take the time to read my post carefully and reply only if you have information relating to this question. There's a lot of talk about GTBB turbo's having restrictors inbuilt that's clear from the amount of threads on the board. My post clearly specifies though, that I have an N1 oil pump, and i have this external oil feed restrictor.

Sydneykid or someone with first hand experience, can you please confirm that with all RB engines, is a restrictor on the block still required if a 1.5mm turbo oil feed restrictor for the turbo is in place? (1.5mm in my RB25 application). Does the location of the restrictor make a difference to oil starvation at the sump? Or does the restrictor HAVE to be installed in the block, leadng to the head ONLY? cheers.

You sure are confused…………….let’s see if I can fix that…………….

1. There is no relationship between the restrictor in the block to decrease the oil flow to the head and the restrictor in the turbo oil feed.

2. The turbo oil feed is plumbed into the block BEFORE the head feed oil restrictor. So the size of the head feed oil restrictor has no effect what so ever on the turbo oil feed.

3. The size of the head feed oil restrictor is ONLY dependant on the oil pump used and the RPM that the engine sees. The turbo (plain or ball bearing) has ZERO effect on the size of the head feed oil restrictor.

4. On RB’s, all ball bearing turbos require an oil flow restrictor because the pipework and fittings are designed for plain bearing turbos. Plain bearing turbos require significantly more oil flow than ball bearing turbos.

5. Ball bearing, water cooled turbos require less oil flow than plain bearing oil cooled turbos

6. SOME ball bearing turbos come with oil flow restrictors standard, some DON’T. Some have add in restrictors, separate parts that you can remove. Some have the oil feed drilled to the right size (ie; no external restrictor is required). Look in the oil feed on the turbo core, if the hole is larger than 2 mm there is no restrictor. If the hole is smaller than 2 mm, then that is the restrictor you are looking at.

Hope that helps

:D cheers :D

thanks for clearing that up. I'll take the head off, and install a 1.5mm restrictor in one of the feeds in the block whilst the engine is out of the car. By the way, here's a picture of my turbo. It looks like it doesn't have the restrictor installed (does this seem to be the case from what you see?), but i'll use the one i bought pictured above at this fitting.

sturbocleaned6ku.th.jpg.sturbocleaned3py.th.jpg

and the other side;

sturbocleaned6xf.th.jpg

Edited by silman

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • I mean it's a bit late to say "This won't have any tangible effect and it is not worth spending more than about three seconds on it, please just enjoy the car" But I said it anyway. Does the pod actually get any airflow in that position behind a bumper like that?
    • Hey guys - apologies for digging this up. Has this website been shutdown or is the outage temporary?
    • So, went shopping at Just Jap for things that might work for the intake  After some trial fitting there I ended up with a 3" x 45° silicone bend, a 3" x 300mm alloy straight, and a humped joiner, some minor trimming will be required to shorten some of the stuff, but nothing that is beyond my "ham fisted" skills The guy at Just Jap was most helpful as we had all sorts of joiners,  bends and stuff out trial fitting  Laying it out above the stuff in there it seems everything will fit nicely, and looking at it, it is probably the way I should have been looking at doing it from the beginning, probably..... In the end it is a front bar off job anyway to remove the original stuff behind the front bar that is taking up the required realestate needed, so maybe a Thursday or Friday job And because I'm a hopeless consumer, I grabbed some new steel wheel nuts, the current ones are a spline drive type with a "security" socket, that somehow someone keeps misplacing, the new ones are a basic black steel 17mm hex socket In other news: I just did my "final" tax return, I am now officially a old retired veteran pensioner, and I'm milking the system for all it's worth,  life is good
    • I hadn't thought about the variable power steering assist. Presumably, it will always be the same level of assist as you get in an S14. The R32/3/4 are either helliishly heavy (at low speeds) if the solenoid is not powered at all, or hellishly too light (at high speed) if it is powered all the time. I presume that it is PWM controlled on those cars. I hadn't thought about the S cars not having variable assist. ugh. What crappy plebby cars they must be!  
    • Hmm yeah that is a good point. It looks like it'll just bolt in with no real issue besides maybe the bushings being different. My other concern was that 2 pin plug that I assume is used in some way to control the rack solenoid depending on the speed signal from the ecu. The DMAX rack doesn't even have that plug though so, don't think it'll matter. Might just order the rack and see how it goes. Will update this when I figure something out
×
×
  • Create New...