Journal Bearing Precision VRT guys - Are you running an oil restrictor

[optiks]

restrictor

[V-dubbulyuh]

Toasted a 6262 journal bearing turbo in 6 weeks with a restrictor. Precision says not to run a restrictor because the oil pressure in the VR6 isn't considered high.

I personally do not run a restrictor... unless it starts to seep oil and enlarging the drain does not remedy the problem. I also agree with what you stated about the Vr not being considered high pressure.

[turbo mike]

what type of oil pressures are you guys seeing at idle when warm?

[V-dubbulyuh]

what type of oil pressures are you guys seeing at idle when warm?

idle warm: 25-30 psi
cruise vacuum: 50-60 psi
cruise boost (hard): 75 psi

These are pretty average values on most of my setups however I have a car that can run as much as +10 psi beyond the values just listed.

[PjS860ct]

ok so which fitting should I use for my Precision JB 6766 turbo???



arnold at pagparts made me the (man-made) restrictor for a JB turbo

[optiks]

i use the top one and everything has been great from 0-12 000km

[CorradoFuhrer]

-4 feed, -10 return, journal bearing billet 6262 on a 24v, no restrictor, no problems thus far..5-6k on this particular kit.

same setup on my 12v.

[turbo mike]

idle warm: 25-30 psi
cruise vacuum: 50-60 psi
cruise boost (hard): 75 psi

These are pretty average values on most of my setups however I have a car that can run as much as +10 psi beyond the values just listed.

I'm seeing about 12psi at idle warm, and around 75 when driving. I think the bentley says oil pressure at idle should be around what I'm seeing. Anyone else?

Sent from my ADR6350 using Tapatalk

[TBT-Syncro]

I'm seeing about 12psi at idle warm, and around 75 when driving. I think the bentley says oil pressure at idle should be around what I'm seeing. Anyone else?

12 is way below spec (and if accurate, your motor shouldnt be driven as is). smashed oil pan perhaps?

[turbo mike]

freshly built motor. used oil pump...might replace that and see whats up.

[turbo mike]

bentley states a fully warm motor:

@2000RPM, should see atleast 29psi

higher engine speeds should result in close to 101psi(max)


im seeing ~37psi at 2000rpm and a tad over 75psi at 6000rpm. anyone have more information about pressure at idle? bentley doesnt state anything from what i could find.

[24vGTiVR6]

I know this is bringing back an old thread.... but I have recent actual experience that could help others.

I remember reading this before I started building my VRT, and ultimately decided to go without a restrictor - I made my choice mainly from the advice I received from Kinetic. 6-7 months later.... thick smoke poured out the exhaust. Took everything apart and there's oil in the DP, intake, etc...... seal died.

I've come to the conclusion that a 24v VRT running a JB needs a restrictor - OR - a shut off valve + gauge setup in-line to regulate correct pressure (which is what I run now).

-4AN feed / -10AN drain (0.625 ID)

Oil pressure (at 200F):
@ idle - 12psi
@ 2k RPM - 26psi
@ 7k RPM - 84psi

[MRosier]

Heres my experience...I have the PTE JB unit on my 12v that came with my kinetics kit. I forget the actual model #. Anyway, I bought the kit new, overboosted unknowingly due to precisions retarded wastegate having 3 vaccuum ports and no warning in the owners manual to cap off the extra boost signal port off...long story short melted 2 pistons sending piston and ring bits everywhere in the oil. Sent my 5k mile old turbo into precision for them to tell me it was not a manufacturer defect and the bearings and back housing were toast.

Now I can sort of see where they were coming from with the whole "cut your oil filter open I bet youll find metal" (even though I never told them I melted pistons) Even still, the feed line is filtered oil correct?? Despite that I just wanted the turbo back so I Paid to have it rebuilt..meanwhile drove the car without the turbo kit and fresh internals with no smoking whatsoever. Reinstall the newly rebuilt turbo and drove to H2O with zero reported smoking. Fast forward to now and now I have really random smoking problems again yet no oil in the IC pipes or anything that could be seen with the downpipe off.

I've been running the supplied restrictor from the kinetics kit since day one. -4an feed/-10an drain. No smoke ever on cold starts. Sometimes I get a cloud of smoke on start up when the engine is hot. Sometimes it randomly smokes at a warm idle for a few seconds then goes away. I never see any behind me while cruising but who knows what its doing. Don't even want to bother sending it in again for them to tell me its my fault and make me pay to rebuild their pos turbo for it to happen again. And to add, compression is on point, virtually no cyl leakage after performing a leakdown test..and the car is fast as **** so I do not have a worn motor issue here.

[Capt.Dreadz]

I'm still running my restrictor with no problems at all.

[PjS860ct]

my restrictor is a little bigger than the normal .065 restrictor (almost .080) and my JB billet precision is still good