turbogeek87;2075917 said:
What was your reason for going to AN 12 from AN 10 for the drain? I have a HX35W I'm putting on my 7m and I have 4 AN feed and 10 AN drain lines, and a 1.5mm Oil Restrictor. I have the stock oil pump, not shimmed, but i have dumped the pressure system for a temperature based system. It seems that you were having trouble with your HX35w. I would rather smoke and have sufficient flow to the bearings, rather than not smoke and have a short turbo life. You also played around with a restrictor, but you took it off?
I have a leaky pan, so I'm thinking of getting the driftmotion pump when I replace the pan. I'd like to have the rest of the system figured out, but it seems like it is still hit and miss for what seems to work for people on the 7m, for what I have gathered on the board. If you could tell me your reasoning for the 12 AN and no restrictor, that would be a great help to me. Thanks for your contribution by keeping this thread going.
Larry
the reason for the 12an return is that holsets from the factory, specifically an hx35 come with a 19mm dran line. 19mm is .74 inch so basically 3/4".
a 10an hose is .5" and the 12an hose is .75". so being that i wanted a drain line no less than the size of the factory line i opted for the bigger hose. sure its more expensive for the fittings and hose, but i know that insufficient drain line size will never be my issue.
as far as the restrictor goes, i took it out because the bearings were "burnt" and after some reading/searching online i found that it was mostly caused by lack of oil.
so as of now im running unrestricted 4an feed and 12an return straight to the oil pan.
here is some good information on oil pressure taken from the holset manual
8. Normal oil temperature is 95+/-5°C (203+/-9° F). It should not exceed 120°C (248°F) under any operating condition.
9. Any pre-lube oil must be clean and meet the minimum CD classification.
10. The orientation of turbine housing, bearing housing and compressor cover is fixed according to application. During installation, do not attempt to rotate these components. Inclined turbocharger installation is not recommended. If an installed angle is necessary, oil inlet centreline must be +/- 10 degrees from vertical and rotor centreline +/- 5 degrees from horizontal.
11. Holset permits oil return pipes to decline at an overall angle of not less than 30 degrees below horizontal.All turbocharger applications require a pipe of internal diameter greater than 19 mm which has integrated connectors. To ensure oil returns into the engine under all operating conditions, the return connection into the engine sump must not be submerged and the outlet flange of the turbocharger must be 50 mm above the maximum oil level of the engine sump pan. Crankcase pressure should be limited ideally to 0.8 kPa (0.12 lbf/in2) but 1.4 kPa (0.20 lbf/in2) can be accepted by reference to Holset.
12. Oil pressure of 150 kPa (20 lbf/in2) must show at the oil inlet within 3 - 4 seconds of engine firing to prevent damage to turbocharger bearing system. A flexible supply pipe is recommended.
13. The minimum oil pressure when the engine is on load must be 210 kPa (30 lbf/in2). Maximum permissible operating pressure is 500 kPa (72 lbf/in2) although 600 kPa (88 lbf/in2) is permitted during cold start up. Under idling conditions pressure should not fall below 70 kPa (10 lbf/in2).
14. Recommended oil flows for the turbochargers are 2 litre/min at idle and 3 litre/min above maximum torque speed.​
the key is idle pressure from what ive come across.
holsets want MINIMUM 10 psi at idle which 7m's lack. upgrade the the driftmotion pump and this is corrected.
make sure when youre in boost or under a load oil pressure is around 30psi. i cant remember what my stock system ran but ill get +10psi per 1000rpm or so then the relieve valve opens up iirc around 45-50. i dont look at my pressure gauge that often anymore just a quick glance.
if youre having your hx35 rebuilt anytime soon i Highly highly recommend the turbine side step gap ring and if any sign of the seat on the bearing housing is worn, just get a new bearing housing. between those two and a properly sized drain, ive never had a smoking issue again.
take the information as you like, sure other people have had luck with different setups but ive had good luck with this one too.
hope it helps!
EDIT:
you must have posted while i was writing, ill get some pictures of where my drain line goes. its straight to the pan though i blocked off the factory flange on the block
i used 12an bung was welded to the pan with a 45* pushlock fitting on the pan side with oil rated nylon hose going to a straight fitting on the turbo side. the pan had to be removed to do this.
