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Big turbos and oil roasting

krawler

By krawler,
in General Maintenance

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krawler Mentor

krawler

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Posted

G'day

I bought an RB30 powered car (*whimper* vl *whimper*) with a T60-1 turbo on it, which is pretty big.

Its oil cooled only, so after even a relatively minor hoon the whole thing is glowing a beautiful cherry red. The problem with this is that its gonna be roasting the oil fairly quickly.

My normal oil change procedure is oil and filter at 5,000k but since this turbo is roasting the oil so much worse than a RB25DET + stock turbo @ 1bar I'm thinking maybe I need to do it more reguarly on the RB30.

Basically I was thinking of using a cheap oil with a decent filter. Change the oil ever 1,000-1,500k but leave the filter in for the full 5,000. Anyone know of any bad effects of doing this? I'm figuring that because the oil isnt roasting to a thicker viscosity and there are no other solids being introduced into the oil, it shouldnt require the new filter?

Any thoughts? Or is the whole exhaust housing + manifold glowing red "normal" with a larger turbo? I'll take a photo of it glowing next weekend. And the glowing isnt from running lean, its actually running very rich.

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Roy Grand Master

Roy

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Whats glowing red, the exhaust and exhaust housing? The centre cartride doesnt see the 800deg C exhaust gases like the turbine housing, but sure it still gets very hot.

Rather then use a poorer qulaity oil and changing more frequently, i think it is more important to run a good quality oil that has been shown to be stable at high temps and run an oil cooler.

My turbo isnt water cooled, guess what, neither are Porsche Turbos, Evo Lancers, etc etc. All use plain bearing turbos with no water cooling, just like my TD06...sure it would be better if they did but i think the quality of the oil is more important at the end of the day.

Only my opinion though. I also got my exhaust and exhaust housing ceramic coated which in theory retains more of the heat/energy in the exhaust....so the centre cartridge shouldnt see as high a temp

krawler Mentor

krawler

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Its only the exhaust housing itself (well, +manifold and dump pipe), not the center or any portion of the compressor side.

I was just concerned with how quickly the oil turns to dark black. I had a turbo laser before this, running magnatec, and it would take most of the 5000k to goto black. The VL does it within 2000k.

Currently running magnatec, which is too thin for the old RB30 anyway. By "cheap oil" I'm not talking No Frills or Home Brand, just not magnatec/Mobil1/redline oils.

RiverSide Proficient

RiverSide

Posted
Posted

A wise man once told me.........."there is no point changing the oil if you leave the old filter on there.........do it right, ALL THE TIME. will save your engine in the long run."

I live by that, for the sake of a 7-10 dollar filter is it really worth risking your engine?

Congrats on the purchase Krawler.........somehow i am not surprised you bought a commodore :(

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