jbody305 wrote:piston rings or valve guides damaged for sure
My Email wrote:
Most likely there is too much oil pressure, pushing oil past the seals in the turbo and burning up in the exhaust. Eventually this leads to total seal failure and oil leaks. You should go to http://www.atpturbo.com and look for oil pressure restrictor kits, or you can buy restrictors on ebay. This will limit the oil pressure into the turbo so it doesn’t push the oil past the seals. This is a really common problem, the turbo’s aren’t designed to handle more than about 15-25psi of oil pressure, but on cold startup, your oil pressure easily reaches 80psi or more.
Shifted wrote:jbody305 wrote:piston rings or valve guides damaged for sure
No...
I wrote this to you in an email just last night, why are you posting this again? Here was my answer:
My Email wrote:
Most likely there is too much oil pressure, pushing oil past the seals in the turbo and burning up in the exhaust. Eventually this leads to total seal failure and oil leaks. You should go to http://www.atpturbo.com and look for oil pressure restrictor kits, or you can buy restrictors on ebay. This will limit the oil pressure into the turbo so it doesn’t push the oil past the seals. This is a really common problem, the turbo’s aren’t designed to handle more than about 15-25psi of oil pressure, but on cold startup, your oil pressure easily reaches 80psi or more.
jbody305 wrote:Shifted wrote:jbody305 wrote:piston rings or valve guides damaged for sure
No...
I wrote this to you in an email just last night, why are you posting this again? Here was my answer:
My Email wrote:
Most likely there is too much oil pressure, pushing oil past the seals in the turbo and burning up in the exhaust. Eventually this leads to total seal failure and oil leaks. You should go to http://www.atpturbo.com and look for oil pressure restrictor kits, or you can buy restrictors on ebay. This will limit the oil pressure into the turbo so it doesn’t push the oil past the seals. This is a really common problem, the turbo’s aren’t designed to handle more than about 15-25psi of oil pressure, but on cold startup, your oil pressure easily reaches 80psi or more.
a turbo system needs at least 30 psi of oil pressure to be safley operated as for 80 psi on cold start ups are you out of your mind there is a litte thing called a oil pressure relief valve which brings it down to a safe pressure
Brian Whalen wrote:About 75 psi here idling at 1100 RPM while warming up.
http://www.turbobygarrett.com/turbobygarrett/tech_center/faqs.html wrote:# 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.