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Oil restictor & oil feed to PTE and similar turbochargers
Have a precision 5858 and was sizing the oil feed which I will run from thermostat controlled sandwich plate which will run to a front mount oil cooler.
Will the fitting below suffice, it looks like restrictor of some kind?
re: Oil restictor & oil feed to PTE and similar turbochargers
Do not use that kind of oil feed inlet. For one the nipples are really easy to break off if you arent careful torqueing it, and they dont provide a laminar flow of oil to the cartridge at low oil pressures due to the way the fitting is designed.
What turbo users have to realize is that a restrictor's purpose is to help regulate oil pressure into the oil channels of a turbocharger. What many of these Plate and mid-line restrictors do is they have an empty pocket within that fitting or flange that fill with oil and force itself through the smaller hole.
The problem with that configuration is that the oil pressure that fills these channels through that midline hole is reduced and not regulated at the lower oil pressure, so that it is steady enough to stream in, whether the car is at 75psi of pressure (cold start), or 20psi of pressure (warm idle). When you use these other types of restrictors, they more or less "drip" into the oil inlet at the point where the hole is drilled inside the plate.
That also means that the oil pressure fluxates as oil pressure at the line changes from cold start or WOT to warm idle. This fluxuation is what causes oil starvation problems within the turbocharger, because the channels aren't constantly filled with oil at the proper reduced rate.
You want a fitting like this that screws directly into the cartridge.
And depending on your oil pressures (generally 80+ with hondas), youll want to run a 0.065" for a Journal bearing and 0.030" or 0.035" for ball bearing.
re: Oil restictor & oil feed to PTE and similar turbochargers
More questions about this, so I plan to use the thermostat sandwich plate in the pictures below for use with a front mounted oil cooler and to an after market oil pressure gauge.
Can I use the other 1/8 NPT fitting on the sandwich plate to feed the turbo oil or it's better to go the most traditional way of T piece at where the oil pressure sensor goes? There's two types, one that goes straight into the block and another that extends by hose which might be a better option as some say they tend to snap of the block due to vibrations.
re: Oil restictor & oil feed to PTE and similar turbochargers
I've personally never had an issue with the nipple breaking off but that looks like an eBay special and for something of that nature a quality piece would be recommended. the female version like Lightning said is clearly going to be stronger because you'll likely use a steel adapter fitting. .065 restrictor for journal bearing turbos works out well and if you can swing it an inline filter to the turbo is always a good idea IMO we had one on my FP7287 and with the amount of junk in my oil after tearing up the motor on the dyne i was glad my turbo was getting filter oil or it would be a 3k dollar paper weight LOL
Oil restictor & oil feed to PTE and similar turbochargers
