Thread: oil restrictor with gt28rs

hey guys just wondering


if i use factory det oil and coolant lines on my gt28rs do i need a restrictor. i hope not cuz i put it all together and drove it

cheers

rob

I'd assume you would because even if stock oil lines have a built in restrictor it's for journal, not ball bearing turbos. From my understanding, journal bearing turbos need/can deal with more oil than ball bearings. I'd get a restrictor.

Now, what damage the stock DET lines will do over time idk. Probably lessen the life of the turbo.

ya but gt28rs is ball barring.

I know, that's what I said in my post to you

You need a restrictor. The restrictor that's built into the banjo bolt for your oil feed on a stock setup will allow too much oil to the CHRA, causing seal blowout. Ballbearing turbos need very little oil compared to journal bearing turbos.

I ran a GT28RS with the stock oil restrictor for a long time with zero issues. You guys are thinking into it way too much.

Factory restrictor is better than nothing... .035 restrictor is what you should be running to optimize your setup and prolong turbo life. If I paid $800+ for a snail I would be pissed if it took a crap early because I skimped on a $30 part...

its pretty easy to put in a restrictor i'd rather be safe then lazy

TurboByGarrett.com - FAQ's

Does my turbo require an oil restrictor?
Oil requirements depend on the turbo's bearing system type. Garrett has two types of bearing systems; traditional journal bearing; and ball bearing.

The journal bearing system in a turbo functions very similarly to the rod or crank bearings in an engine. These bearings require enough oil pressure to keep the components separated by a hydrodynamic film. If the oil pressure is too low, the metal components will come in contact causing premature wear and ultimately failure. If the oil pressure is too high, leakage may occur from the turbocharger seals. With that as background, an oil restrictor is generally not needed for a journal-bearing turbocharger except for those applications with oil-pressure-induced seal leakage. Remember to address all other potential causes of leakage first (e.g., inadequate/improper oil drain out of the turbocharger, excessive crankcase pressure, turbocharger past its useful service life, etc.) and use a restrictor as a last resort. Garrett distributors can tell you the recommended range of acceptable oil pressures for your particular turbo. Restrictor size will always depend on how much oil pressure your engine is generating-there is no single restrictor size suited for all engines.

Ball-bearing turbochargers can benefit from the addition of an oil restrictor, as most engines deliver more pressure than a ball bearing turbo requires. The benefit is seen in improved boost response due to less windage of oil in the bearing. In addition, lower oil flow further reduces the risk of oil leakage compared to journal-bearing turbochargers. Oil pressure entering a ball-bearing turbocharger needs to be between 40 psi and 45 psi at the maximum engine operating speed. For many common passenger vehicle engines, this generally translates into a restrictor with a minimum of 0.040" diameter orifice upstream of the oil inlet on the turbocharger center section. 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.

Is the W11 T25 ball bearing?