Forced Induction Superchargers | Turbochargers | Intercoolers

on3 76mm feed/drain

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Old Sep 11, 2012 | 11:13 AM
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Default on3 76mm feed/drain

Quick question for the guys who have this turbo or have use this turbo. What size is the Feed/drain on this turbo? I'm just trying to order the right fittings ill need. Yes! i searched, and i couldnt find a specific answer.

Last edited by nick.celis; Sep 11, 2012 at 11:14 AM. Reason: spelling
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Old Sep 11, 2012 | 11:15 AM
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i have a -3 and -8 on my MP70s....

really a single -3 T'd into two -3s since i have two turbos...
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Old Sep 11, 2012 | 11:22 AM
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Only thing i read that came close to specifics was the feed, and i read it was 1/8th, if anyone can comfirm? I believe the on3 feed/drain is NPT though i'm not 100% sure
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Old Sep 11, 2012 | 11:29 AM
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On3 oil feed hole is not 1/8 NPT, it's something weird. I bought flange for mine with a 1/8 NPT female hole. I will be running -3AN feed and -10AN drain.
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Old Sep 11, 2012 | 11:38 AM
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Originally Posted by Ferocity02
On3 oil feed hole is not 1/8 NPT, it's something weird. I bought flange for mine with a 1/8 NPT female hole. I will be running -3AN feed and -10AN drain.
hmmm....what about the draine hole? what size is that? is that NPT as well?
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Old Sep 11, 2012 | 12:43 PM
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Originally Posted by nick.celis
hmmm....what about the draine hole? what size is that? is that NPT as well?
Drain hole is un-threaded I believe, you will need a flange as well. Generic T4 flanges work. I got mine on eBay.
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Old Sep 11, 2012 | 12:45 PM
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Here is a thread: https://ls1tech.com/forums/forced-in...urbo-guys.html
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Old Sep 11, 2012 | 12:47 PM
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ya disregard, i'm retarded lol. the listing clearly states
"To ensure the longevity of your turbocharger, we normally run 1/8" feed and a 5/8" return. This is very important and without this properly sized, you can cause damage to the product"
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Old Sep 11, 2012 | 12:55 PM
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Originally Posted by nick.celis
ya disregard, i'm retarded lol. the listing clearly states
"To ensure the longevity of your turbocharger, we normally run 1/8" feed and a 5/8" return. This is very important and without this properly sized, you can cause damage to the product"
-3AN fittings have a 1/8" inside diameter. Chad (the on3 guy) recommended I use a restrictor on the feed because my oil pressure gets up to 80psi. He said no smaller than 1/16". Although many people use them without restrictors without issues.
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Old Sep 11, 2012 | 01:11 PM
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awesome! thanks for the info!
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Old Sep 11, 2012 | 10:22 PM
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I run a -4 feed and -10 drain, no issues here!
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Old Sep 12, 2012 | 06:40 AM
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I can get the fittings needed for this turbo if anyone is interested. The drain requires an offset flange to clear the compressor housing and is -10an. The feed line has a built in restrictor for the turbo and is -4an
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Old Sep 12, 2012 | 08:36 AM
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Im running -3 feed with no restrictor and -10 return. My feed on the turbo was 1/8npt but I got an early unit I believe. My roommate bought 2 of these for his camaro and one was 1/8th and the other was something weird like stated before. Anyway Ive been running the oil like that for over 3000 miles with no problem
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Old Sep 12, 2012 | 10:12 AM
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Originally Posted by superman09
i can get the fittings needed for this turbo if anyone is interested. The drain requires an offset flange to clear the compressor housing and is -10an. The feed line has a built in restrictor for the turbo and is -4an
pm sent!!
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Old Jan 30, 2013 | 08:12 PM
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so just to make sure, a 4an feed and a 10an return, i shouldnt need any kind of restrictor right?
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Old Jan 30, 2013 | 08:19 PM
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I run a -6 and it "Y"s into -4. I did have to ad a restictor. I was getting a little excess oil. Couldn't drain quick enough. I also have -10 drain lines and no restrictions to stop draining. The set up like this I have had NO issues. Runs perfect. No excess smoke, etc...
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