Quote:
Originally Posted by Myke
One more thing is it to late to put this -4 in and were do u get them from. Is this a size ud recommend?
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The way i read the ad, you need to remove the oil restrictor if there is one, not add it, but i could be wrong.
So yes, if you really have a restrictor and you needed to remove it, it is already too late. But i would not be so sure ... a starved turbo would have died faster than that i think. Remember how that thing is spinning at 150.000rpm and uses oil the same way your crank does: they need pressure so the axle stays floating on the bearings. No pressure = axle grinding on bearings, then developping play, and at 150.000rpm ... it DOES serious and fast damage.
Oil smoke issues now ... if you dont have a proper breathing system, your turbo will burn oil as there will be more pressure in the crank case than in the turbo housings; thus oil will go where there is less pressure, usually through the exhaust housing seal, making smoke, instead of going to the crank case.
This is a major problem though. It does not look like, but a pressurized crankcase means oil does not return there easily and can puddle in the head, leading to starvation. If you have never cleaned the breather system, it would be a good idea to do it. I know the CA18 has a nasty 90° brass bend that gets clogged, but i dont know if the rb25 also suffers from that kind of flaw. Check it.
I had a smoking problem on a 7mgte (mark 3 turbo supra), but this one was due to a cracked valve seat. It did burn a lot of oil though, before it starved the engine to death. This was discovered while rebuilding. It could have happened, but it is a bit unlikely.
Last usual cause of oil smoking is worn valve seals. The engine would smoke when down shifting, when vacuum is at its maximum.