Oil Feed Line - 4an with resrictor or 3an line?

[93jdmlaser]

I am putting on a bullseye to4e and I was reading about how you get too much oil pressure and can cause leaks. My question is to reduce the oil pressure should I get a restrictor fitting from slowboy for the 4an line or get a 3an line?

 

[LookDadNoBdyKit]

I am having high oil pressure in turbo problems with my PTE 50 trim. Its blowing past seal on exhaust side. I ordered the SBR Restrictor fitting to use with my -4AN RRE Feed line. Hopefully it will take care of the problem.

 

[1029TSG]

Restrictors and -3 oil lines should be your last resort, only after you know your turbo is smoking due to high oil pressure.

 

[red91gst]

Restrictors and -3 oil lines should be your last resort, only after you know your turbo is smoking due to high oil pressure.

Agreed, the restrictor fitting is meant for the GT Dual BB turbos, not a standard bearing. Most likely to much oil pressure is not the problem.

Nate
SBR

 

[1029TSG]

Yes, thats true. Always check your drain first. Do not use RTV, only paper gaskets. Be sure its not kinked or restricted in any way and its at least 1/2" I.D. Too much oil pressure at the turbo, 55 psi or more can be caused by shimmed oil pumps, balance shaft removals, heavy weight oils and so on.

 

[LookDadNoBdyKit]

Agreed, the restrictor fitting is meant for the GT Dual BB turbos, not a standard bearing. Most likely to much oil pressure is not the problem.

Nate
SBR

I also aftree that it should be a last resort. My PTE 50 trim is smoking alot. Oil is leaking out onto the center section and also comeing out of the exhaust. I took it apart and the wheel/downpipe was not covered in oil..which i was expecting since i thought there was a bad seal. Showed turbo to some locals and it was their opinion that the oil pressure is way to high and is getting pushed past the seals. Hopefully the restrictor will solve it.


Nate, would you recommend not doing this? Could it limit the oilflow too much? What other options do I have to lower the oil pressure. Its being fed from the oil filter housing and i have my balance shafts removed so the oil pressure is very high. On cold mornings, my autometer oil pressure gauge is pegged at 100psi and still is very high even when the car has warmed up.

 

[1029TSG]

Do you have oil coming out both sides, compressor as well as turbine?

 

[LookDadNoBdyKit]

No. No oil on compressor housing side whatsoever. All the oil comes out on exahust side. Here were pics from when I pulled the turbo: http://getboosted.net/ericspics/index.php?path=Car Stuff/GSX/50trim

There is also no shaft play at all on the exhaust wheel or compressor side. Turbo has around 10,000 miles on it.

 

[1029TSG]

In most cases, oil will squeeze out from both sides when its due to high oil pressure.

 

[Burnett03]

No. No oil on compressor housing side whatsoever. All the oil comes out on exahust side. Here were pics from when I pulled the turbo: http://getboosted.net/ericspics/index.php?path=Car Stuff/GSX/50trim

There is also no shaft play at all on the exhaust wheel or compressor side. Turbo has around 10,000 miles on it.

same thing my pte did, i ditched it and got a real turbo, AGP

 

[LookDadNoBdyKit]

What is needed to put the restrictor on? Im using an RRE SS feed line right now. Will I need to get any other fittings for it? Or does it just screw onto the line and then screw onto the 90* fitting on the turbo?

I will try using a bigger drain tube before I put the restrictor on to see if that fixes anything.

 

[1029TSG]

You could probably use the SBR restrictor, it would just need to be drilled to .080"

 

[LookDadNoBdyKit]

You could probably use the SBR restrictor, it would just need to be drilled to .080"

The hole in the restrictor would need to be drilled out? What is the reason for needing to drill it out?

Thanks

Eric

 

[1029TSG]

The restrictor SBR sells is for a ball bearing turbo, they require less oil pressure than a standard bearing cartridge. I believe its drilled to .048 which is NOT recommended for a T3/T4 turbo.

 

[Maglin]

OK.. Both of you have your Balance shafts removed. And cause of that you are seeing very high oil pressure. High oil pressure greatly effects a lot of engine internals other than the turbo. Higher pressure will wreck havoc on your rear main seal and other oil seals in your car. I would suggest that instead of buying a restricter that you enlarge your oil bypass in the oil filter housing. This is the reason for the high oil pressure to begin with. With the BS's removed the oil that used to get pumped their now has to go else where and the hole isn't big enough to releave the high oil volume and you get high oil pressure. I did mine when I did my BSE and I actually enlarged it a lot and thought that I went to far. Turned out my oil pressure is just below the normal mark at idle now and at 7500 RPMS it is about 3/4 of the normal markings. I used to also have oil blowing out of the turbo seals on both the compressor and turbine with the stock motor from the high oil pressures at high RPMs.

Their is a thread around here somewhere that has some pictures of it. You just take the oil filter housing off and take the large bolt/plug out and the spring and piston that is in their and take a dremel and enlarge the hole. Do some searches on it and you'll find it. Best way to go. And it only costs you the price of a new gasket. Not to mention it's easy as pie to take off.