oil restrictor line size?

[s13mikesr20]

35r journal bearing garrett hasn't gotten back at me yet Hurray

[2.5T_/<ouki]

http://zilvia.net/f/chat/297481-small-questions-thread-search-first-use-instead-making-new-threads.html

[cotbu]

35R isn't a journal bearing turbo!

[s13mikesr20]

I was told it was a journal but the dude didn't even know what day it was

[s13mikesr20]

Though* ima take pics then u guys lmk

[jr_ss]

Go to ATPturbo and find the correct size for you 35R. If you run a large drain(-10 or bigger) you don't need a restrictor.

Most likely your restrictor size will be in the .03-.06 range...

*edit- http://www.atpturbo.com/mm5/merchant.mvc?Screen=PROD&Store_Code=tp&Product_Code=ATP-OIL-021&Category_Code=GTBB

[s13mikesr20]

Old pics from when I wad looking for downpipe

http://i1161.photobucket.com/albums/q502/Canadasr20/bad084ca.jpg

http://i1161.photobucket.com/albums/q502/Canadasr20/6d09ae9a.jpg

[s13mikesr20]

So exhaust housing is .83 and from spa turbo but the cartridge and front housing no markings :c

[jr_ss]

So look in the oil drain. If you see no plastic, all metal it's BB. If you see plastic and metal is journal

My guess, it's a journal bearing turbo.

[ch1873857]

run the part number of the CHRA

[s13mikesr20]

Ok the oil drain is big but ill take a gander

[derass]

there was just a thread about identifying ball bearing vs journal, it involves looking in the oil feed, there should be a smaller threaded hole within the threaded hole for the feed. it is a pin used when disassembling the bearing cartridge.

using a larger drain does not mean you can run without a restrictor, you will still be providing the bearings with too great a volume of oil and risk damaging the bearing/seals

GT28/30/35 uses 0.035" restrictor

[jr_ss]

using a larger drain does not mean you can run without a restrictor, you will still be providing the bearings with too great a volume of oil and risk damaging the bearing/seals

GT28/30/35 uses 0.035" restrictor

If you can evacuate the oil before it builds up pressure inside, your not going to supply it too great of volume. BB turbos need volume, not pressure. The main concern is blowing out the oil seals, which, without pressure won't happen.

Now if the drain chokes down, has a blockage, or crazy bends in it, then yes, you run the risk of "over oiling" the turbo.

[s13mikesr20]

Now is there a difference in journal and ball bearing restrictor sizes?

[UNISA JECS]

From Garrett:

Garrett | FAQ (http://www.turbobygarrett.com/turbobygarrett/faq)

Q. Does my turbo require an oil restrictor?
A. 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.


So if you have a journal bearing turbo and yoru turbo is clocked correctly and you have a good adequate oil return you should not need a restrictor.