XLR8S
Novice Class
Posts: 63
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posted April 15, 2010 02:43 AM
Turbo Oil Feed restrictor?
Can anyone tell me if I need to run the oil feed line restrictor with a garrett GT28 dual ball bearing turbo? Most of the info out there is for a car, and I just want to be sure.
Thank You!
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ZX14, 1 piece at a time............. Roger
  
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zxbob
Pro
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posted April 15, 2010 03:00 AM
Yes !
On my bike I took a nitrous jet and drilled it out . . . . it worked perfect
with the AN fitting on the oil supply line !
Bob
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dubious
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posted April 15, 2010 04:30 AM
.040" right at the turbo inlet.
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zxbob
Pro
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posted April 15, 2010 07:04 AM
quote:
.040" right at the turbo inlet.
Bob
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XLR8S
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posted April 15, 2010 03:01 PM
Thanks guys!!
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ZX14, 1 piece at a time............. Roger
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01smokes
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posted April 15, 2010 04:08 PM
why do that? im not to sure im understanding why you guys wanna restrict the flow
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dubious
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posted April 15, 2010 05:38 PM
so you don't starve the crank and rods, and so you don't flood the turbo, and push oil out to the turbine and blow blue down the road...
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01smokes
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posted April 16, 2010 05:35 PM
quote:
so you don't starve the crank and rods, and so you don't flood the turbo, and push oil out to the turbine and blow blue down the road...
and you guys say a 40 jet ill try it out and see how it works
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dubious
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posted April 16, 2010 06:52 PM
It depends on what type turbo, what size you need. so check with manufacture.
Also make sure you don't already have one, or you will take out your bushing/ bearings prematurely, with 2 restrictors inline, as pressure and flow drops 2 times then.
for example:
.060" for bushed Rayjays etc, and as small as .030" for bearing garrets.
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natural selection.....
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Some are not worthy of the effort.
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XLR8S
Novice Class
Posts: 63
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posted April 18, 2010 04:22 AM
Thanks for all the input guys. Now I have another question. i was clocking the turbo last night, and took a real good look at the oil inlet. Do any of the Garrett ball bearing turbos come with a restrictor already installed in the inlet? Looking into the inlet, it looks like you are looking at the top of a nitrous flair jet, which is the part an inverted flair fitting would mate to. But, it looks like a dead end hole, with a smaller oil hole approx .040 that exits through the side of the fitting, maybe 1/8" form the bottom of the hole. It really looks like a restrictor, and I'd hate to ad another if this is the case. This is a GT2854R.
Thank You!
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ZX14, 1 piece at a time............. Roger
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dubious
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posted April 18, 2010 09:05 AM
That would be a restrictor.
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XLR8S
Novice Class
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posted April 18, 2010 11:53 AM
Thank you, looked like one to me.
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KZScott
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posted April 18, 2010 12:58 PM
quote:
Also make sure you don't already have one, or you will take out your bushing/ bearings prematurely, with 2 restrictors inline, as pressure and flow drops 2 times then.
can you explain this, or have a link with the details?
thx
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Stu64
Zone Head
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posted April 18, 2010 01:39 PM
Since were talking about turbo's, i've got a question about wheres the best place to hook up the line for the boost gauge?
Could i use a tap off of the air filter cover?
The diagram i have shows it inline with the line to the wastegate,but wouldn't it be better to read the actual airbox pressure? Stu.
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dubious
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posted April 18, 2010 05:22 PM
 Edited By: dubious on 19 Apr 2010 01:27
Stu, yes airbox is more indicative of pressure at the throttle bodies, instead of at the turbo outlet, but in reality it probably won't be much difference, unless it was on a car with allot of plumbing, or intercooler.
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Stu64
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posted April 19, 2010 02:51 AM
Thanks Lyle.
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dubious
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posted April 19, 2010 06:42 AM
quote:
quote:
Also make sure you don't already have one, or you will take out your bushing/ bearings prematurely, with 2 restrictors inline, as pressure and flow drops 2 times then.
can you explain this, or have a link with the details?
thx
Although the plumbing on either side of an orfice may be the same diameter, the pressure and flow are reduced downstream. The resultant pressure drop is dependant on upstream pressure and orfice size.
Therefor for example you have a pipe with 100 psi behind it, with an orfice 10% of the pipe diameter, the result may be a 70% pressure drop to 30 psi. If you hgave a second orfice restrictor 10% of pipe diameter with 30 psi upstream, you might have only 5 psi after the second orfice plate, sice it doesn' have the flow or pressure of a full pipe feeding it.
In industrial process we use flow orfices all of the time for static pressure drop and flow reduction.
Google flow orfice calculations. Should be able to find some info.
"ask "search engine works better for technical stuff I find
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natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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XLR8S
Novice Class
Posts: 63
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posted April 19, 2010 04:08 PM
Awesome information!
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ZX14, 1 piece at a time............. Roger
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