I have been doing soem research about restrictors and using needle valves to help keep the oil seals from blowing out. I found a guy form a Nissan board that machines a restrictor that would do the trick. He stopped making them, but says with enough interest he would make another run. Price would be @18.00 shipped. Please post if you would be interested.

 

me, X10!

 

I would like more info on them

Rob

 

This is probably the restrictor he is talking about....
http://www.sr20forum.com/showt...pp=20

I'm not a big fan of using restrictors but the link will have pictures and some info about the restrictors for those who are interested in it.

 

im thinking of putting the welder on AC, and doing a pluse or two on my "stock" feed nipple. This will significantly decrease the size, and should help. Only thing is, go too small, and well, ya...

 

If you can help find more interested people we should be able ot get these done. I know my newly built turbo is putting a little oil through the seals. The link that is posted is th eone. It should work fine on our turbos also. I have done the research and the turbo does not need much oil, especially not what is supplied at 60-75psi from a -3An or -4AN line. I manage a water filtration lab and it is amazing how much liquid can be pushed through a line those sizes at only 15-20psi, let alone 60 psi.

 

Just a couple quick questions since I am interested in this. What happens at the lower psi levels, like when idling? Will the turbo still get enough oil? Is a -3AN and -4AN line about the same size that would come with a DRAG kit? If not, how thick is it? I know the line from my DRAG kit is about the same thickness as a pen or pencil or right around there.

 

The restrictor will help keep a more constant flow even at idle. The drag kit I believe comes with -3AN. This is an easy install. Just thread it into the turbo inlet and then screw your inlet feed fitting itnot the restrictor.

 

i am interested someone pm me if he starts selling them again.

 

Okay, I am in if he decides to make more.

 

I will let him, know. I am just waited for word on how many he wants to be ordered before he will make them.

 

I emailed him a couple weeks ago about this too. I'd be in.

 

I am somewhat in doubt as to the function of the valve and the veracity of the producer's claims, but if they can be validated by popular consensus, I'd be down for getting one too

 

Hopefully he will be up to making a batch. It seems people will buy if they are made. They just help to insure the oil seals are not stressed by too much oil during operation.

 

Restriction builds pressure in most cases, unless these valves can vary the oil pressure with rpm. So essentially you are going to put more pressure onto oil seals.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted hybrid &raquo;</TD></TR><TR><TD CLASS="quote">Restriction builds pressure in most cases, unless these valves can vary the oil pressure with rpm. So essentially you are going to put more pressure onto oil seals.</TD></TR></TABLE>

can you expand on this? It seems like even if you do restrict oil flow either with a fitting (restrictor) or small line you are increasing pressure but reducing volume. would that not help prevent blowing oil seals?

I have read that restrictiors are fine (and functional) if you need them, that was in "Maximum Boost" i think.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted hybrid &raquo;</TD></TR><TR><TD CLASS="quote">Restriction builds pressure in most cases, unless these valves can vary the oil pressure with rpm. So essentially you are going to put more pressure onto oil seals.</TD></TR></TABLE>

I think that would be true if the restrictors were placed inline after the turbo... but these go in front... unless I'm missing something real stupid, they'll just create a 75psi backlog into the restrictor and drop pressure to 10psi or whatever after, and that's what goes through the turbo. The system behind the restrictor (the feed) isn't closed so pressure won't rise, it'll just go to the head instead.... IMO... please LMK if I'm wrong.

 

You are correct. If the restrictor was after the turbo it would cuase a problem, but before the feed it would act similiar to using a smaller line, which will add to the pressure going in the turbo.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted hybrid &raquo;</TD></TR><TR><TD CLASS="quote">Restriction builds pressure in most cases, unless these valves can vary the oil pressure with rpm. So essentially you are going to put more pressure onto oil seals.</TD></TR></TABLE>

He is absolutely correct, think of what happens to a garden hose when water is coming out, and you squeeze the end. water comes out at a higher pressure, because it is still moving that same volume, but now to compensate for the lack of area, it has to push it out faster.

Rob

 

or just put your thumb over the end of garden hose and see how hard the water shoots out after.

i think that is a good example.

 

I understand that concept but what if you were to place it at the tee off the block(in the common setup w/ a tee at the oil pressure sending location) I cant see any harm what so ever. You are infact relieving pressure from the port that was plugged at one time. I can see a problem if you were to put it at the turbo itself because it would put a ton of pressure on the line and fittings before the restrictor. However, it seems to me that if it was close to the block(source for the oil) there wouldn't be a problem at all.

 

HKS still makes this restrictor and there is a 90* model. If enough of you guys want them I can grab a few and then send them to FFgeoff of Flamenco-T for distribution. As usual, I will make ZERO / "0" / NO profit from this deal.

 

I don't think a garden hose would be good to use in an analogy because there's only one way out for that. In the engine the oil can escape to other ports and not just force EVERYTHING out the restrictor. If I can get one of these, I can PROMISE that I'll do an experiment with oil pressure gauge before and after the restrictor, giving numbers for both sides. If someone can sell me one, I'll do the rest. I'm curious myself as to what the outcome will be...so I'd do it anyways, I'll just post the results.

 

Yeah.. hose doesn't work as an example, the pressure builds in the garden hose as you plug the end and tries to push your thumb off harder. Try it.

But a few feet down, if you put a hose over the end of your thumb/hose with the same volume as the original hose and with your thumb restriction in the way, flow would have been reduced and would slow. It would have to. It's not a single change in hose diameter, it's two changes - down to the diameter of the restriction, then back up again.

 

explain the benefits of this.... and how it works.. i'm a turbo noob