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Restrictor Ramblings #5006572
02/10/19 08:57 AM
02/10/19 08:57 AM
Joined: Oct 2004
Posts: 3,240
Midwest, Illinois
beanoil Offline OP
beanoil  Offline OP

Joined: Oct 2004
Posts: 3,240
Midwest, Illinois
I got this idea from a thread on an import board. The discussion was in regards to restricting oil to turbos.Might be old news to most of you, just sharing an idea.
In my mind the restrictor should be on the output of the head, after the filter. YMMV, some folks restrict the input. I do not know if it's critical either way, just that the majority of bypass systems restrict the out flow of the filter. This could still work even if the filter has a built in restrictor and you wanted to throttle it back more.
You'll have to figure out flow rate on your own, but I found it pretty easy to use a measuring cup, and count seconds to calculate quarts per minute/gallons an hour.
Thread the end of the fitting internally and add a hex head plug with red loctite on it to seal.
Just drill the size hole you want in the hex head.
1/32 drill bit is .0312
3/64 drill bit is .0468
1/16 drill bit is .0625




IMG_0143.jpgIMG_0145.jpg
Restrictor in fitting.

Last edited by beanoil; 02/10/19 08:58 AM.

beanoil: Tough under heat, real dirty afterwards.
Re: Restrictor Ramblings [Re: beanoil] #5006577
02/10/19 09:00 AM
02/10/19 09:00 AM
Joined: Oct 2010
Posts: 9,393
Virginia Beach
Astro14 Offline
Astro14  Offline

Joined: Oct 2010
Posts: 9,393
Virginia Beach
Why would you want to restrict oil going to the turbo?


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Re: Restrictor Ramblings [Re: beanoil] #5006580
02/10/19 09:02 AM
02/10/19 09:02 AM
Joined: Oct 2004
Posts: 3,240
Midwest, Illinois
beanoil Offline OP
beanoil  Offline OP

Joined: Oct 2004
Posts: 3,240
Midwest, Illinois
In that thread, some import guys had switched turbos and needed less oiling for their selection. Different bearings and seals.


beanoil: Tough under heat, real dirty afterwards.
Re: Restrictor Ramblings [Re: beanoil] #5006589
02/10/19 09:11 AM
02/10/19 09:11 AM
Joined: Oct 2010
Posts: 9,393
Virginia Beach
Astro14 Offline
Astro14  Offline

Joined: Oct 2010
Posts: 9,393
Virginia Beach
It's a new concept to me...

I've owned several turbo cars, and never considered restricting the oil flow to the turbo(s).

But then, my turbos have all remained stock. Even with a mild tune, I've not needed a different turbo...

Hard to believe there is such a thing as "too much oil" to the turbo.


32 Packard 15W40
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02 Volvo V70 XC 0W40 Edge
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Re: Restrictor Ramblings [Re: beanoil] #5006658
02/10/19 10:10 AM
02/10/19 10:10 AM
Joined: Jun 2002
Posts: 12,809
The Motor City
Kestas Online content
Kestas  Online Content

Joined: Jun 2002
Posts: 12,809
The Motor City
I still don't understand the downside of too much oil going to the turbo bearings.

Re: Restrictor Ramblings [Re: beanoil] #5006787
02/10/19 12:17 PM
02/10/19 12:17 PM
Joined: Aug 2004
Posts: 2,158
5600 feet elevation, Arizona
double vanos Offline
double vanos  Offline

Joined: Aug 2004
Posts: 2,158
5600 feet elevation, Arizona
Back in the Mazdaspeed 3 days a smoking turbo was an issue when you straight piped the exhaust system- no back pressure the theory went caused oil to get past the turbo seals and she’d smoke her a** off at idle. I ran both my Mazdaspeed 3s totally stock and never had a smoking turbo. No oil consumption either. Restricting the oil to the turbo was supposed to alleviate this.


Sabine Schmitz is the Queen of the 'Ring; Svetlana Kapanina is the Queen of the SKIES...
Re: Restrictor Ramblings [Re: beanoil] #5006820
02/10/19 12:46 PM
02/10/19 12:46 PM
Joined: Oct 2004
Posts: 3,240
Midwest, Illinois
beanoil Offline OP
beanoil  Offline OP

Joined: Oct 2004
Posts: 3,240
Midwest, Illinois
I only got the idea from a turbo thread.
The restrictor idea seems solid to me, and would enable a generic filter head to be used with a bypass filter.
Heads for specific bypass filters have a restrictor built in, but oil pressure and viscosity can effect flow, and someone may want to slow that down.


beanoil: Tough under heat, real dirty afterwards.
Re: Restrictor Ramblings [Re: beanoil] #5006879
02/10/19 01:36 PM
02/10/19 01:36 PM
Joined: Jun 2009
Posts: 474
New England
555 Offline
555  Offline

Joined: Jun 2009
Posts: 474
New England
Would you be kind enough to let us know what engine/vehicle/turbo you are modifying? At least for curiousity's sake since a lot of BITOG members like turbos.
Thanks


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04 Subaru STi Motul
Re: Restrictor Ramblings [Re: beanoil] #5006988
02/10/19 02:51 PM
02/10/19 02:51 PM
Joined: Dec 2016
Posts: 7,750
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 7,750
Waco, TX
This is common practice.

It keeps the seals from having to hold back a Tsunami of oil.

A lot of factory installs have restrictors, you just don't realize it.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Restrictor Ramblings [Re: double vanos] #5007721
02/11/19 08:50 AM
02/11/19 08:50 AM
Joined: Oct 2018
Posts: 121
Houston,TX
Purpfox Offline
Purpfox  Offline

Joined: Oct 2018
Posts: 121
Houston,TX
Same here, restricting the feed to the speed3. also kept the charge pipes much cleaner. (FMIC) turbo mainly need flow more so than pressure.


Certified Analyst ( by no means an expert Much to learn )
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