Turbo smoking
I get a lot of people in the shop asking about similar issues.
Before you restrict any turbo...ensure that the oil drain is correct sizing(T4 turbos-10 at least- T6 turbos -12 at least). Once your sizing is good...then you need to look at the drain line itself. It needs to flow like how a water slide would.... no high spots...all smooth shot from turbo into pan or return area. If all of those stars align,...and you have a smoking turbo...then I would look POSSIBLY into a restrictor.
Before you restrict any turbo...ensure that the oil drain is correct sizing(T4 turbos-10 at least- T6 turbos -12 at least). Once your sizing is good...then you need to look at the drain line itself. It needs to flow like how a water slide would.... no high spots...all smooth shot from turbo into pan or return area. If all of those stars align,...and you have a smoking turbo...then I would look POSSIBLY into a restrictor.
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Joined: Nov 2003
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From: Norn Iron
Largest possible drain is wanted...in my experience anyways. General rule...for what I would recommend anyways which, is just an opinion. T3/T4 I would use -3 feed/-10drain and T6 -4 feed/-12 drain.
Does RPS sell a -12 drain kit? If I'm gonna do it it's going to be before the motor goes in.
Just buy the fittings and measure for the hose.. You'll save yourself some money. There is no "cookie cutter" awnser to this problem. The only constant in a gravity drain journal bearing turbo application is to minimize all restriction if possible. The bigger the better.
Pre packaged from RPS is actually cheaper
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LOL WOO! Ever since Eastbound and down came out.....we've been "WOOing" every day lol. Example? (not work safe) lol Video Link: http://youtu.be/GoWblwKdeHg
When it comes down to it though, the "right" way to do it, is to find out what the manufacturer of the turbo wants for oil pressure in the cartridge. And you would restrict down to that pressure for when your setup is at high rpms.
He said what turbo he had in his OP. And I came to my conclusion because a buddy of mine has that EXACT same turbo, and when he ran unrestricted line, it would blow past the seals and smoke. Put on a 0.060 restrictor and all is well. My turbo was the exact same situation, but mine is a Garrett T6 turbo. 4AN smoked, 0.060 did not. When it comes down to it though, the "right" way to do it, is to find out what the manufacturer of the turbo wants for oil pressure in the cartridge. And you would restrict down to that pressure for when your setup is at high rpms.
Also, for your reference, here is the link to Garrett's website. Which nowhere it states about voiding a warranty.
http://www.turbobygarrett.com/turbobygarrett/faq
http://www.turbobygarrett.com/turbobygarrett/faq
Originally Posted by Garrett's website
Again, it is imperative that the restrictor be sized according to the oil pressure characteristics of the engine to which the turbo is attached. Always verify that the appropriate oil pressure is reaching the turbo. The use of an oil restrictor can (but not always) help ensure that you have the proper oil flow/pressure entering the turbocharger, as well as extract the maximum performance.
Last edited by 93camaro_zzz; Sep 13, 2014 at 05:00 PM.
Also, for your reference, here is the link to Garrett's website. Which nowhere it states about voiding a warranty. http://www.turbobygarrett.com/turbobygarrett/faq
