Oil Requirements
Thread Starter
TECH Apprentice
Joined: Nov 2005
Posts: 304
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From: Newmarket, Ontario
Oil Requirements - Need Help 1. How much oil flow does a GT42 (non ball bearing) need at Idle?
2. How much oil flow does a GT42 (non ball bearing) need at ~ 6000 rpm?
2. How much oil flow does a GT42 (non ball bearing) need at ~ 6000 rpm?
Last edited by bigturboz28; Jan 17, 2006 at 07:42 PM. Reason: Added question mrk to get attention, no one is reponding.
Thread Starter
TECH Apprentice
Joined: Nov 2005
Posts: 304
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From: Newmarket, Ontario
Just back in town and was disappointed that no one knows this answer. I am running a -5 to the turbo (no restrictions) and a -8 from the turbo with a scavenger pump back into the engine. I am throwing a little oil into the exhaust from the turbo and was wondering if i should have a restriction in the line to the turbo?
1. How much oil flow does a GT42 (non ball bearing) need at Idle?
2. How much oil flow does a GT42 (non ball bearing) need at ~ 6000 rpm?
1. How much oil flow does a GT42 (non ball bearing) need at Idle?
2. How much oil flow does a GT42 (non ball bearing) need at ~ 6000 rpm?
Thread Starter
TECH Apprentice
Joined: Nov 2005
Posts: 304
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From: Newmarket, Ontario
Follow up In case anyone does a search for this thread in the future here is what I found...
Min line to turbo -3
Min oil flow 0.5 l/min
Min gravity feed line from the turbo (with -3 feed line) -8 if pretty much going perfectly down into pan (recommended -10 or bigger if any bends)
For reference my setup is a -5 line to the turbo (tapped off the oil filter), and I am seeing about 2 l/min.
My line to the engine is a -8 with scavenger pump.
Other info... feed turbo with as much oil as possible (turbo will limit flow), and ensure no oil is getting backed up in turbo. Turbo needs high flow oil for cooling not lube (even a very low flow with lubricate the turbo enough).
Min line to turbo -3
Min oil flow 0.5 l/min
Min gravity feed line from the turbo (with -3 feed line) -8 if pretty much going perfectly down into pan (recommended -10 or bigger if any bends)
For reference my setup is a -5 line to the turbo (tapped off the oil filter), and I am seeing about 2 l/min.
My line to the engine is a -8 with scavenger pump.
Other info... feed turbo with as much oil as possible (turbo will limit flow), and ensure no oil is getting backed up in turbo. Turbo needs high flow oil for cooling not lube (even a very low flow with lubricate the turbo enough).
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Staging Lane
Joined: Apr 2005
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From: 123 fake st reading
big turbo I'm having the same problem did you find any info on running an oil filter between turbo and the pan. did they say if it would starve the turbo or not I'm using a -6an line and thanks for the info you found out
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Originally Posted by Dr.x
big turbo I'm having the same problem did you find any info on running an oil filter between turbo and the pan. did they say if it would starve the turbo or not I'm using a -6an line and thanks for the info you found out
Don't put a filter in the return line. The return is gravity drain, not pressurized. A filter will only back up the drain, causing smoking or alot of oil pushing past the shaft seals.
You want to feed to the turbo generously, and put the largest drain you can fit with the straightest shot down. You also want to keep the CHRA no more the 30° from vertical so the oil can actually drain properly. That's rotated about the turbine shaft. Tilt should be minimal, like 10° max from horizontal.
I like to feed the turbo with -4 teflon or hard line (larger ID than standard rubber -4) and use a real hydraulic flow control valve to keep the feed between 5 and 10 GPM based on my pump pressure. Minimum drain size of -10, preferably -12 if i can package it.
Just my .02
Thread Starter
TECH Apprentice
Joined: Nov 2005
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From: Newmarket, Ontario
Update My setup is now a -5 line to the turbo (tapped off the oil filter), and my line to the engine is a -12 with 7gpm scavenger pump.
(was still throwing a little oil and wanted the problem to go away..)
I think with the proper oil pump a -8 line would be fine (mine was a homemade job using a LS1 fan motor and car oil pump I got from local parts store).
(was still throwing a little oil and wanted the problem to go away..)
I think with the proper oil pump a -8 line would be fine (mine was a homemade job using a LS1 fan motor and car oil pump I got from local parts store).