GrantMC2

Help HT !

Im now in a position to purchase my snail .. However I will now be holding off as speaking with my supplier, once the current stock of these run out, Garrett will then be supplying them as standard with the "metal cage upgrade" as standard. As i dont intend on building until next year, i'll hold off until this comes into place.

But while i was on the phone to my supplier, they confirmed that the gt2871r has an in built oil resitrictor as standard. Restricting up to 80psi. They advised me that a further restrictor is NOT needed.

When purchasing my oil feed kit from B&R - it stipulates 0.035" restrictor for GT turbos. About 0.9mm .. As have other sources..

Is this right to run the additional restictor? Im now worried about starving the turbo!!

Thanks .....

GrantMC2

And yet i then find this on Garretts website

"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.
Turbo
Q. Does my turbo require an oil restrictor?"

TheShodan

iTrader: (14)

Yes... You will still need one as the .035" regulates the inlet pressure from 22psi-40psi. Since most petrol vehicle applications get anywhere from 70psi-120 psi, you would be doing yourself a disservice by not running the proper size and style restrictor for such an expensive item.

The metal cage transition takes over 2 years to completely cross over, and you'll never know the difference from either CHRA number or part number. All they are doing is going from steel ball-bearing to the ceramic hybrid..

So relax.you can get it now or later it's your call. But you're not gaining any real advantage in waiting a year

GrantMC2

Indeed this is my worry! Last thing I want is to bust the turbo! Thanks Shodan.

Re metal cage .. Is it myth that the plastic can somewhat melt/deform under application? Or is it just extreme/race/drag application?

TheShodan

iTrader: (14)

It's a composite cage, and no, they don't deform when properly lubricated and water cooled. It's not about application, it's making sure you have the right accessory parts to keep those kind of issues from occurring.

GrantMC2

Which i have in the form of the B&R kits