stevechumo
Active Member
Does anyone know of the engine oil pressure at the oil pump and at the oil filter housing?
Thx.
Thx.
1uzfe oil pressure PSI
- Thread starter stevechumo
- Start date
The 1UZFE EGR Delete Kit is available for sale here.
Red Supra,
Very interesting that you measured the oil pressure at different engine conditions.
Most put a restrictor on the oil inlet side..
When I fitted twin Nissan turbo's I had to fit 1mm oil restrictor on each oil feed line..
1mm is easy enough for a ball bearing turbo and 80Lb oil pressure..
I wouldn't use a restictor on a shaft bearing turbo..
If it smokes with shaft bearing ?? Chances are there's issues with oil return hose to sump..
Or there's blow by build up in crankcase...
stevechumo
Active Member
Thank you. No wonder my turbo blows the seal. I'm putting on the oil restrictor now.
Hey Steve, it's been a while since I've seen you or your ride. What's your ride like since I last saw it? I remember it having a single turbo, stock auto tranny, and you were putting out about 300whp at the time..
Anything change? How has the turbo been so far? Lot's of trouble, any regrets?
I remember you did the boost cheaply too.. Made the extractors from scratch, etc. Nice work.. Even did the needles on you cluster. Ha HA..
Anything change? How has the turbo been so far? Lot's of trouble, any regrets?
I remember you did the boost cheaply too.. Made the extractors from scratch, etc. Nice work.. Even did the needles on you cluster. Ha HA..
stevechumo
Active Member
I haven't heard from you for a while. Thought you've gone MIA. LOL. The whole setup is much better now. Nothing is stock anymore. It's dynoed at 380 with a calculation of 28% loss to the wheels. Looking to dyno again after changing the turbo seals and to tune the tranny a little bit more conservative. It now has bigger turbo (the biggest one that can fit in my setup now), completely built tranny, complete fuel system, standalone AEM EMS...etc. The cost eventually exceeded my initial calculation.
^^ Yeah, I went MIA for a while, but was always around.. Lost interest once my SC4 started to fall apart. Got it back in shape again.. It's running great..
Ok Steve, I see you stepped up. You da man!!!
You built up the auto tranny too, Boost logic is my guess? That's a good idea.. I almost did that myself until I saw the price with shipping.. I went cheap and just decided to blow out the old stock trannies instead.. They are cheap to replace and swap out I figured..
A bigger single turbo, ok.. Wicked!!! How about the internals of your 1uz-fe?.. Did you replace the pistons, studs, etc..?
I don't think I'll be racing you now Steve..Must be fast as hell.. Did you beat James yet with his 2jz powered SC4?
Lastly do you still have your 350KX kicker amp in the back thumping?
Ok Steve, I see you stepped up. You da man!!!
You built up the auto tranny too, Boost logic is my guess? That's a good idea.. I almost did that myself until I saw the price with shipping.. I went cheap and just decided to blow out the old stock trannies instead.. They are cheap to replace and swap out I figured..
A bigger single turbo, ok.. Wicked!!! How about the internals of your 1uz-fe?.. Did you replace the pistons, studs, etc..?
I don't think I'll be racing you now Steve..Must be fast as hell.. Did you beat James yet with his 2jz powered SC4?
Lastly do you still have your 350KX kicker amp in the back thumping?
SC400TT
Active Member
stevechumo
Active Member
John,
I'm glad you got the SC up and running again. I guess you don't run NOS anymore due to its destructive power. I think you can try the centrifugal supercharger that can be set up under $2K. The most successful runner is KC95. He ran almost a flat 12 sec for 1/4 mile.
For the tranny, I didn't go with Boost Logic. Too expensive. I went with Red Eagle HP rebuilt kit and IPT valvebody shift kit. Half price of Boost Logic.
I still have stock pistons & rods on an low mileage 91 1UZFE, but I'm using Cometic headgaskets lowering compression down to 9:5:1 with ARP head studs.
Ryan,
I didn't pay attention much to the oil pressure to the turbo. I asked Turbonetics builder if I need an oil restrictor, but he said no. That's why it gave me a headache now. I think he's not aware the 1UZFE has more oil pressure than other cars. From what I researched, there shouldn't be no more than 35 psi going to the turbo. If you have 25 psi, then you're in very good shape.
I'm glad you got the SC up and running again. I guess you don't run NOS anymore due to its destructive power.
I think you can try the centrifugal supercharger that can be set up under $2K. The most successful runner is KC95. He ran almost a flat 12 sec for 1/4 mile. For the tranny, I didn't go with Boost Logic. Too expensive. I went with Red Eagle HP rebuilt kit and IPT valvebody shift kit. Half price of Boost Logic.
I still have stock pistons & rods on an low mileage 91 1UZFE, but I'm using Cometic headgaskets lowering compression down to 9:5:1 with ARP head studs.
Ryan,
I didn't pay attention much to the oil pressure to the turbo. I asked Turbonetics builder if I need an oil restrictor, but he said no. That's why it gave me a headache now. I think he's not aware the 1UZFE has more oil pressure than other cars. From what I researched, there shouldn't be no more than 35 psi going to the turbo. If you have 25 psi, then you're in very good shape.
stevechumo
Active Member
That oil pressure is enough to kill 3 turbos at the same time.
SC400TT
Active Member
What's your psi at idle on cold start and after warm up?
Ryan
Ryan
That oil pressure is enough to kill 3 turbos at the same time.
Red Supra
New Member
Yes it's high or the sensor is reading high. Check out my thread for more pressure numbers. http://www.lextreme.com/forums/showthread.php?t=1855&page=8
stevechumo
Active Member
I didn't install the oil pressure gauge, so I don't know. From the researches, many turbo guys say the turbo leaks the oil the most when the engine idles or when it's cold. So that can relate to the created high pressure when the engine idles or is cold. There's no perfect solution for lowering the oil pressure to the turbo. It can make the turbo hotter with less oil traveling through it. A turbo timer is neccessary in this case.
Red Supra,
Very interesting that you measured the oil pressure at different engine conditions.
XR8tt
Active Member
If there's oil seal issues with high pressure oil supply..
Most put a restrictor on the oil inlet side..
When I fitted twin Nissan turbo's I had to fit 1mm oil restrictor on each oil feed line..
stevechumo
Active Member
I'm afraid 1mm is too small, so I use 2mm hole. Do you think that's good? I never had to use oil restrictor on 4 banger Hondas. 
XR8tt
Active Member
Depends on oil pressure ?? Also SOME turbo's have built in restrictors..I'm afraid 1mm is too small, so I use 2mm hole. Do you think that's good? I never had to use oil restrictor on 4 banger Hondas.
1mm is easy enough for a ball bearing turbo and 80Lb oil pressure..
I wouldn't use a restictor on a shaft bearing turbo..
If it smokes with shaft bearing ?? Chances are there's issues with oil return hose to sump..
Or there's blow by build up in crankcase...
stevechumo
Active Member
I took the turbo back to the rebuilder and he said the bearing is worn out and it seems like oil starvation. WTF? I told him I didn't have any oil restrictor before, so that's impossible. Maybe he just made up something to cover up his mistake.
The return line has good angle, and the crankcase is vented out. So I can rule those out.
I just bought an oil pressure tester today and even with the 2mm restrictor, the oil pressure is surprisingly at 75 psi at idle.
Is there a reason you wouldn't use an oil restrictor on journal bearing turbo? Not enough oil?
The return line has good angle, and the crankcase is vented out. So I can rule those out.
I just bought an oil pressure tester today and even with the 2mm restrictor, the oil pressure is surprisingly at 75 psi at idle.
Is there a reason you wouldn't use an oil restrictor on journal bearing turbo? Not enough oil?
XR8tt
Active Member
Oil coking can cause bearing failure.. When engine is turned off while turbine CRA is hot...
Also the tune can make turbines very hot with conservative engine tune.. Too rich and retarded... Fuel burns in exhaust not engine..
Shaft turbo's are generally not water cooled and rely on oil to cool CRA if oil flow is too restricted would cause issues.. Flow is more important than pressure..
Unfortunately fitting a restrictor doesn't necessary limit pressure .. It limits flow ...
Pressure is a restriction of flow..So in shaft type turbo a restrictor is not required...
Also the tune can make turbines very hot with conservative engine tune.. Too rich and retarded... Fuel burns in exhaust not engine..
Shaft turbo's are generally not water cooled and rely on oil to cool CRA if oil flow is too restricted would cause issues.. Flow is more important than pressure..
Unfortunately fitting a restrictor doesn't necessary limit pressure .. It limits flow ...
Pressure is a restriction of flow..So in shaft type turbo a restrictor is not required...
stevechumo
Active Member
Everything that you listed is valid, but I could rule them out in my setup. I've researched a lot, and the last thing that can blow the turbo seal is too much oil pressure even with journal bearing turbo as in the opposite of oil starvation (not in my case). I'll try the 1.5mm oil restrictor and see how it'll go.
And thanks for all of your gentlemen's feedbacks.
And thanks for all of your gentlemen's feedbacks.
stevechumo
Active Member
I checked the oil pressure at the end of the oil line before the turbo. This oil line is t'eed off the oil pressure sender. An old excuse like an old wife tale?
