do i need a oil restrictor on a holset????

[boomers04]

I just got my holset h1c back from being rebuild should i run a oil feed restrictor on it so it does not blow out the seals. I have heard of people puting the hole down to a .060. If anyone knows about this please help me out. I have the turbo ready and mounted waiting to turn the key, but want to know if i need to restrict it first.

[Carl H]

i would, straight an line is usualy too much.

[Sil240]

How do you know when you need a restictor??I have a Garrett t3/t4 with -4AN to 1/8 NPT fittingLike this:http://cgi.ebay.com/ebaymotors...ZWDVW

How much oil pressure is there stock on a RB, stock pump?

[Cjmartz2k]

I don't run one on mine.

[240z4u]

Back from the dead, Chris are you still running w/no restrictor on the oil feed?

Evan

[Cjmartz2k]

Actually no, I put one in. Don't remember what size though. I started getting intermittent blue smoke out the tail pipe which we chalked up to the oil seal. After the restrictor no more problems. I think the DSM guys website that I linked in one of the Holset threads on here would probably be the best place to find out what size.

[240z4u]

Great, I can look into the size further. No problem. Thanks.

[meet07]

After reading this I decided to take our GSE truck here at the airport around for a spin to monitor the oil pressure...It saw no more than 75 psi at WOT...40 or so at idle.

This is on a 24v inline 6 Cummins in a 2000 FL-80 Freightliner with a HX35 turbocharger... Hope that helps.

[240z4u]

Meet, that is actually really helpful!

Thanks.

Looks like .060 is the orifice size of choice on the DSM forums. 1/16 basically.

[Sil240]

How do you know when you need a restictor??I have a Garrett t3/t4 with -4AN to 1/8 NPT fittingLike this:http://cgi.ebay.com/ebaymotors...ZWDVW

How much oil pressure is there stock on a RB, stock pump?

I just remembered about this...I called Turbonetics and they said:"No, you don't need a restrictor for any of their turbos. Just follow the instructions"

So for a -3 or -4 AN oil feed to a Turbonetics T3/T4 you DO NOT need a restictor.

Taken from Turbonetics site:http://www.turboneticsinc.com/install_instructions

"Oil inlet line: Clean filtered oil is part of the life support system for your turbocharger, it provides lubrication, cooling and vibration dampening of the rotating group as it accelerates through it’s RPM range. The oil feed line size from the engine or oil supply source to the turbocharger is critical to provide an adequate amount of oil to the turbocharger without flooding it. For turbocharger models: T-3through T-Seriesuse either -3 AN (1/8”) or -4 AN (1/4”) Mid-Frame, Y2Kand Thumperseries require -4 AN (1/4”)"

[jacksonbrown]

NO RESTRICTOR- I have a HX35 with -6 feed no restrictor and has been running fine. The turbo's bearing will be the restriction. If you read the factory service manual from Holset they give you the free flow oil requirements for turbo and I am still a little low. If it starts smoking you have drain tube,crank case evacuation or blow-by problems. They also say not to run more then 70 lbs of oil pressure on Holset but this car will hit 90- 100 psi at 2000 to 2500 rpm if I leave to quickly after starting and still no probs. Run the biggest drain tube with as straight a shot at pan as possible and you will have no probs

[240z4u]

Jackson, from what I have seen you are one of the fortunate ones.

I am going to run a restrictor.

[BHayes_S13Coupe]

Oh god I count even count how many hours i've read on the dsm thread about holsets needing a restrictor.

As said earlier, make sure you have a good enough drain. I plan on running a -3an feed line with no restrictor, if i was running a -4 i would use a restrictor but im going to see if it needs it first. As for the return line I will probably go with a -12an.

But here's a a good read i came across while searching for this...

http://www.dsmtuners.com/forum....html

[240z4u]

Oh god I count even count how many hours i've read on the dsm thread about holsets needing a restrictor.

As said earlier, make sure you have a good enough drain. I plan on running a -3an feed line with no restrictor, if i was running a -4 i would use a restrictor but im going to see if it needs it first. As for the return line I will probably go with a -12an.

But here's a a good read i came across while searching for this...

http://www.dsmtuners.com/forum....html

I AM running a -4 feed. Guy above me seems to think that -6 is fine too!

Musta missed something, you didn't say anything at all earlier in this thread. I did read the oil drain scenario thread on DSM forums. Great theory that nobody has proven to be correct.

Evan

[Kevin.A]

Just for the record, my RB20 on stock oil pump put out about 180 kPa at idle and 420 kPa at 6000 RPM which google says is about 26psi at idle and 61psi at 6000 RPM

[BHayes_S13Coupe]

What size drain are you all using?

I meant to reiterate what jackson said about running the biggest drain line with a straight shot to the pan.

[240z4u]

What size drain are you all using?

I meant to reiterate what jackson said about running the biggest drain line with a straight shot to the pan.

Ahh cool, I thought I had missed something.

-10 and the line is fairly short, has no kinks or flat areas for oil to sit or lose speed on the way to the pan. If I find smoking with the restrictor and this setup Ill post the solution. I am going to put an oil pressure gauge this summer on there to verify inlet pressure etc... I never end up under boost in the winter anyway.

Thanks for your input.

Do you have a holset?

Evan

[BHayes_S13Coupe]

Yessir, I have a 8 blade hx35w. Its not on the car yet as i'm still gathering parts and such. If all goes well should be going on my rb25 in april or may.

[as240]

i think the reason why dsm guys run a restrictor is because they run 100+ psi of oil pressure through those motors.
most rbs get get above 80 psi unless your oil is still cold (in which case you shouldnt be revving out anyways) or unless you have a Jun or some other high pressure oil pump. im going to run a -4 and if i need to i can always get a restrictor like a .10 or something on the larger end

[240z4u]

I have been running without a restrictor since I put mine on without issue. Not to say this will work for everyone.

[StricNyne]

i have a holset hx35 on my rb25 with a n1 oil pump, and no restrictor and an-4 line, my oil levels have been fine, i run 0-30 in summer and 10-30 in winter, i have a an10 drain too

[as240]

i run 5-40 syn rotella year round so im thinking about running a -3an feed.
is anybody running the cast hks bottom mount manifold with their hx35?
just wondering what kind of clearance issues im going to run into

[Cjmartz2k]

i run 5-40 syn rotella year round so im thinking about running a -3an feed.
is anybody running the cast hks bottom mount manifold with their hx35?
just wondering what kind of clearance issues im going to run into

I ran one with my HX35/40 (8 blade compressor) hybrid. We had to notch the subframe, make a custom motor mount, and the intake piping was REAL interesting. This was on a RHD Skyline though. No idea with the steering shaft.

[as240]

were you running the hks bottom mount manifold?
and what part of the turbo made you have to notch the frame?

[Cjmartz2k]

Yup, HKS cast bottom mount. It was the compressor housing that hit the front sub frame. Again though, that was a HX35/40 hybrid. That compressor housing is a good bit bigger.

[as240]

are you positive the hx40's housing is bigger? ive looked everywhere for comparison pics between the two turbo's but it seems like they are nearly identical in physical size. i hope i dont have to cut up my syko mount to make this damn thing fit.

[SullivanRacing06]

run a -3 feed line instead of a -4......