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Pete_89T2 · 05-01-2014, 11:33 AM

During DGRR, I found out that my new BNR turbo (stage 2) oil smokes when letting off the boost while running hard in the twisties and during the steeper uphill climbs; there's little to no smoke while doing the same over straight, flat & level roads. I'm using a -10 AN plumbing for the turbo oil drain, which follows the stock oil pipe path to the front cover. After discussing the symptoms & my oil drain setup with Bryan at BNR, he suggested I try a 0.060" oil restrictor in the feed line, as close to the turbo oil inlet as possible.

I'm currently using the stock S5 turbo oil feed hardline plumbing which has no restrictor. So I was thinking I can easily fabricate a 0.060" restrictor plate out of some 1/16" thick AL stock that would simply install under the stock pipe flange on the turbo side. Other than needing 2 gaskets to seal up the assembly, does anyone see a downside to this plan?

Only thing I can see is I'd be introducing one more potential point for a leak to occur, and the stock hard lines may need to be bent a bit to make it fit properly. I'm not too concerned with the latter as there appears to be enough tolerance/slack in the stock hardline to accept the extra 1/16" restrictor and gasket on the turbo side.

05-01-2014, 11:33 AM	#1
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD Posts: 874 Rep Power: 16	Turbo oil feed restrictor question During DGRR, I found out that my new BNR turbo (stage 2) oil smokes when letting off the boost while running hard in the twisties and during the steeper uphill climbs; there's little to no smoke while doing the same over straight, flat & level roads. I'm using a -10 AN plumbing for the turbo oil drain, which follows the stock oil pipe path to the front cover. After discussing the symptoms & my oil drain setup with Bryan at BNR, he suggested I try a 0.060" oil restrictor in the feed line, as close to the turbo oil inlet as possible. I'm currently using the stock S5 turbo oil feed hardline plumbing which has no restrictor. So I was thinking I can easily fabricate a 0.060" restrictor plate out of some 1/16" thick AL stock that would simply install under the stock pipe flange on the turbo side. Other than needing 2 gaskets to seal up the assembly, does anyone see a downside to this plan? Only thing I can see is I'd be introducing one more potential point for a leak to occur, and the stock hard lines may need to be bent a bit to make it fit properly. I'm not too concerned with the latter as there appears to be enough tolerance/slack in the stock hardline to accept the extra 1/16" restrictor and gasket on the turbo side.