Twin turbo oil temps/hot idle pressure
11-10-2014, 08:09 AM
#2
I can help you a lot since my shortblock is unchanged from the old NA setup I had. I was low 48-51 psi with temp 210-220 f (c5 factory probe by the filter)and around 900-925 rpm idle. With the turbos I added 16 row derail oil cooler with -10 lines and the twin turbonetics journal bearing turbos using -3 lines that tee into the pressure sending unit by the intake manifold. New hot pressure is ~37-41 with oil temps at say 200-210 f. Idle is a little lower (750 rpm) so that cuts down on pressure also. Now if you heat up the oil more it will thin even further, but those are the normal temps I see getting on it from time to time with normal cruse in between. I run Rotella t6 5w40 synthetic oil.
11-10-2014, 08:31 AM
#3
The reason I started this thread was becuase my hot idle is around 25-30psi. I'd like to see 35-40 psi. After a few discussions with my tuner he suggested I was seeing some very high oil temps as my hot idle drops 10 plus after so spirited runs. He too suggested an oil cooler. While we are on the subject where is a good place to pull/feed the oil from? My factory oil
Cooler location is spoken for (turbo oil feed)
Cooler location is spoken for (turbo oil feed)
11-10-2014, 08:31 AM
#4
I can help you a lot since my shortblock is unchanged from the old NA setup I had. I was low 48-51 psi with temp 210-220 f (c5 factory probe by the filter)and around 900-925 rpm idle. With the turbos I added 16 row derail oil cooler with -10 lines and the twin turbonetics journal bearing turbos using -3 lines that tee into the pressure sending unit by the intake manifold. New hot pressure is ~37-41 with oil temps at say 200-210 f. Idle is a little lower (750 rpm) so that cuts down on pressure also. Now if you heat up the oil more it will thin even further, but those are the normal temps I see getting on it from time to time with normal cruse in between. I run Rotella t6 5w40 synthetic oil.
11-10-2014, 08:46 AM
#5
The reason I started this thread was becuase my hot idle is around 25-30psi. I'd like to see 35-40 psi. After a few discussions with my tuner he suggested I was seeing some very high oil temps as my hot idle drops 10 plus after so spirited runs. He too suggested an oil cooler. While we are on the subject where is a good place to pull/feed the oil from? My factory oil
Cooler location is spoken for (turbo oil feed)
Cooler location is spoken for (turbo oil feed)
11-10-2014, 08:47 AM
#6
You can run a adapter in the turbo feed spot that will give you outlets for the cooler, a location for temp and a feed outlet. It's really the only spot to tap into unless you go to the front corner of the block, but that oil is unfiltered.
Edit yes like the one above. I had to mod mine since my stock C5 temp sensor doesn't fit the 1/8 pipe thread. You can also tee into a cooler line, etc if needed.
11-10-2014, 09:11 AM
#7
You can run a adapter in the turbo feed spot that will give you outlets for the cooler, a location for temp and a feed outlet. It's really the only spot to tap into unless you go to the front corner of the block, but that oil is unfiltered. Edit yes like the one above. I had to mod mine since my stock C5 temp sensor doesn't fit the 1/8 pipe thread. You can also tee into a cooler line, etc if needed.
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11-10-2014, 10:04 AM
#9
You can also pick up an "sandwich" plate to run under your oil filter for about $20. Used on on my buick, worked great.
http://www.ebay.com/itm/BLUE-M20-ALUMINUM-OIL-FILTER-GAUGE-FILTER-SANDWICH-COOLER-ADAPTER-PLATE-KIT-/371185559585?pt=Motors_Car_Truck_Parts_Accessories&hash=item566c622821&vxp=mtr
http://www.ebay.com/itm/BLUE-M20-ALUMINUM-OIL-FILTER-GAUGE-FILTER-SANDWICH-COOLER-ADAPTER-PLATE-KIT-/371185559585?pt=Motors_Car_Truck_Parts_Accessories&hash=item566c622821&vxp=mtr
11-10-2014, 11:04 AM
#10
You can also pick up an "sandwich" plate to run under your oil filter for about $20. Used on on my buick, worked great. Video Link: http://www.ebay.com/itm/BLUE-M20-ALUMINUM-OIL-FILTER-GAUGE-FILTER-SANDWICH-COOLER-ADAPTER-PLATE-KIT-/371185559585?pt=Motors_Car_Truck_Parts_Accessories &hash=item566c622821&vxp=mtr
11-10-2014, 11:37 AM
#12
If you live in a "hot" climate the first number is pretty much irrelevant. The second number is the weight and is more critical. I would venture to say the reason why guys go to a higher weight is becuase the oil is being heated up much more via the turbo which will increase the viscosity. In turn making your 50W act more like a 40W
11-10-2014, 11:41 AM
#13
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On my old C5 (N/A) In the summer on a hot day idling in heavy traffic I would usually see around 240* Oil temps and around 21-23psi at 900rpm Idle. That was with 10w40 100k mile stock shortblock with a Ported LS6 pump. Generally I saw around 30-35psi on a cool day with around 200-205* oil temps.
Jay
Jay
11-10-2014, 12:32 PM
#15
9 Second Club
Having had a oil temp sensor on mine for a bit now..
Under most driving conditions, oil temp almost tracks coolant temp.
At a recent track I was at, each outing around 120s for me, just under 2 mile lap.
Wide range of speeds from 30mh to 145mph at the finish.
Oil temps at start of run around 185degF ( same as coolant )
Oil temps at end of run around 230degF, Coolant remained around 190degF
For a decent oil, this is not enough to cause any oil pressure worries or concerns.
I have no oil cooler, and I am running a remote oil filter since turbos were done, Autokraft pan, Melling HV pump with the softer spring
That said, oil pressure on my engine is pretty **** and has been all year, gradually getting worse. Will be pulling it apart over the next few weeks though. It's been together for near 4 years.
I've seen as low as 15-20psi at idle, and 35-40psi at high rpm's
More strangely, oil pressure will literally fall say 3-4psi if I open the throttle. Cruising along, any rpm, no real load on engine...open throttle and oil pressure drops. At first I thought it an electrical issue, but ecu logging does same as mechanical gauge.
Even when racing, in between gearchanges as load is removed then re-applied, oil pressure rises then falls. It's weird !
Under most driving conditions, oil temp almost tracks coolant temp.
At a recent track I was at, each outing around 120s for me, just under 2 mile lap.
Wide range of speeds from 30mh to 145mph at the finish.
Oil temps at start of run around 185degF ( same as coolant )
Oil temps at end of run around 230degF, Coolant remained around 190degF
For a decent oil, this is not enough to cause any oil pressure worries or concerns.
I have no oil cooler, and I am running a remote oil filter since turbos were done, Autokraft pan, Melling HV pump with the softer spring
That said, oil pressure on my engine is pretty **** and has been all year, gradually getting worse. Will be pulling it apart over the next few weeks though. It's been together for near 4 years.
I've seen as low as 15-20psi at idle, and 35-40psi at high rpm's
More strangely, oil pressure will literally fall say 3-4psi if I open the throttle. Cruising along, any rpm, no real load on engine...open throttle and oil pressure drops. At first I thought it an electrical issue, but ecu logging does same as mechanical gauge.
Even when racing, in between gearchanges as load is removed then re-applied, oil pressure rises then falls. It's weird !
11-10-2014, 12:46 PM
#17
I run -10 as to not cause a restriction. You have hose, 90's, fittings, cooler, etc to cause pressure drop. I want to minimize that as much as possible as all your oil is going through the cooler if you don't use a thermostat cooler block (which are large) and in Texas you don't really need it.
11-10-2014, 01:10 PM
#18
Mine are 52psi cold idle and after beating the crap out of it 40psi hot idle. I dont know exact oil temps but they are warm. I have a B&M 70266 for oil cooler with -8 lines. VR1 40w
11-10-2014, 01:11 PM
#19
9 Second Club
Look at it this way.
The internal oil galleries in the block are pretty much 1/2"
The only fittings you will use that maintain at least this size are -12.
Enclosed is image of a run yesterday
Oil temp here was stable at around 225degF ( 108degC )
Oil pressure in yellow, rpm in red. It varies by almost 10psi before, during and after a gearchange !!
Something is badly fucked up. At it's highest point it's still only 46psi, lowest during the run around 33psi.
I cut open a filter a while back and where no signs of any issues in there.
The internal oil galleries in the block are pretty much 1/2"
The only fittings you will use that maintain at least this size are -12.
Enclosed is image of a run yesterday
Oil temp here was stable at around 225degF ( 108degC )
Oil pressure in yellow, rpm in red. It varies by almost 10psi before, during and after a gearchange !!
Something is badly fucked up. At it's highest point it's still only 46psi, lowest during the run around 33psi.
I cut open a filter a while back and where no signs of any issues in there.
11-10-2014, 01:26 PM
#20
Look at it this way. The internal oil galleries in the block are pretty much 1/2" The only fittings you will use that maintain at least this size are -12. Enclosed is image of a run yesterday Oil temp here was stable at around 225degF ( 108degC ) Oil pressure in yellow, rpm in red. It varies by almost 10psi before, during and after a gearchange !! Something is badly fucked up. At it's highest point it's still only 46psi, lowest during the run around 33psi. I cut open a filter a while back and where no signs of any issues in there.