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GT28R (GT2560R) @ 99/00 Miata - do I need a restrictor?

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GT28R (GT2560R) @ 99/00 Miata - do I need a restrictor?

Old 11-24-2009, 11:00 AM
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Question GT28R (GT2560R) @ 99/00 Miata - do I need a restrictor?


as the title above states - my old TB2529 (came with my original turbo-kit) out of a SAAB 9000 has to go - going with the GT2560R now.

Do I need an oil restrictor for this turbo at my 99/00 Miata?

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Old 11-24-2009, 11:57 AM
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im not runnin one on my 2560 and all is good but mine is a 96, still a 1.8 though!
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Old 11-24-2009, 01:00 PM
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Not necessarily, no. I have not used one on my '02 with a GT2860RS.
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Old 11-24-2009, 01:02 PM
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What size of line are you using for your oil feed?
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Old 11-24-2009, 01:48 PM
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TurboByGarrett.com - FAQ's
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.
Yes, you make more than 45psi of oil pressure. My last CHRA smoked like crazy on start-up. Now that I have a .060 restrictor, and the new CHRA, I've dropped from 3500 to 3200rpm for target 11.5psi.

Everyone can keep suggesting that you don't need one, but its a $20-40 part that may save you $450 on a CHRA in a few weeks or years.
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Old 11-24-2009, 02:08 PM
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Originally Posted by hustler View Post
its a $20-40 part
I need to start charging more

PM me if you need one
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Old 11-24-2009, 02:11 PM
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I think I'm going to continue to run with the .060 until someone tells me otherwise, or the turbo starts talking back.

Oh and don't worry, I still have some fab work I need your help with, but my schedule is a wreck.
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Old 11-24-2009, 02:15 PM
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I have not used one on my GT2560R or my GT2871R and have had no ill effects. Funny thing about that FAQ is that Garrett has been building restrictors in their ball-bearing turbos for quite some time so you need to see if it has one or not and go from there.
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Old 11-24-2009, 05:43 PM
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Im running one on mine 2871r. @ 21psi
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