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Old 03-03-2018, 03:49 AM   #2401
turbosenna
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1999 impreza gc8

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did anyone try oem spec c exhaust manifold with custom up pipe (twin or single scroll) ?

i think oem spec c exhaust manifold could work
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Old 03-16-2018, 01:34 PM   #2402
Hyper
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I was smoke testing exhaust looking for leaks, and noticed I got smoke coming out from the WG actuator arm mechanism on the side of the exhaust housing (TS IWG 7163) - is this normal?

also the v-band is leaking, I am tired of repositioning it and tightening over and over, so I will try that ATP v band gasket
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Old 03-16-2018, 01:37 PM   #2403
subaru_gc8
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A little smoke is fine
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Old 03-16-2018, 02:07 PM   #2404
Leafy
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Quote:
Originally Posted by Hyper View Post
I was smoke testing exhaust looking for leaks, and noticed I got smoke coming out from the WG actuator arm mechanism on the side of the exhaust housing (TS IWG 7163) - is this normal?

also the v-band is leaking, I am tired of repositioning it and tightening over and over, so I will try that ATP v band gasket
Slight leak out that wastegate shaft is normal, it needs clearance even once hot to move. I can never get the outlet vband to seal well either, but it seals well enough for me, I do try to grease it and let the cat idle until it stops smoking to make a carbon gasket sometimes. I really wish it had the Interlocking flanges like the premium summit racing ones.
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Old 03-17-2018, 02:27 AM   #2405
kellygnsd
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LINK G4+ hybrid STi

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I found that over tightening the V-band clamps had an adverse effect on their subsequent sealing one you loosen them. Also make sure your flanges are square before you tighten the clamp. I dealt with leaks with mine until I changed the clamp and my clamping technique.
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Old 03-17-2018, 04:44 AM   #2406
Hyper
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what is it?
I use a rubber mallet to hit the clamp around while tightening it, and then use ~50 inch lbs torque
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Old 04-01-2018, 03:07 AM   #2407
sergey2007
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Quote:
Originally Posted by Full-Race Geoff View Post
interestingly Subaru EJ engines are really the only applications ive seen pushing oil. and for the most part its only on built engines, leading me to believe the issue has to do with the oil pump selected or the oil used? hard to say with certainty since our customers are in 90 countries and none seem to be near us.

i will say that when you feed a turbo 100psi oil pressure on the bench, it is noticeably harder to spin compared to 50-60psi oil pressure. It appears the excess oil acts as a "brake" and even though the engineers tell me it is a negligible difference, I believe that slightly reducing oil pressure the better the performance will be. its hard to quantify, so we tested a bunch of different oil restrictor sizes and 1.5mm seems like the best solution. the downside of an oil restrictor is it can take longer for the oil to fill the bearing housing upon engine startup... that seems to be a non issue thus far. I haven't blown a bearing up yet, even with a 1.0mm restrictor (which i anticipated would hurt the turbo). 1.0mm had oil pressure around the 30-40psi range which is just too low in my opinion. I also have some customers who run turbos on quads, snowmobiles and jetskis, hovering between 15-25psi oil pressure and no turbo failures there either. food for thought!
Good afternoon. So did you change your opinion on this issue?
https://www.turbozentrum.de/Oil-Feed...estrictor-16mm



On the basis of the statistics, can it be safely established a 1.6-1.8mm restrictor? and what should be the length of the small part of the restrictor?
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Old 04-02-2018, 12:29 PM   #2408
Subi114
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Originally Posted by sergey2007 View Post
Good afternoon. So did you change your opinion on this issue?
https://www.turbozentrum.de/Oil-Feed...estrictor-16mm



On the basis of the statistics, can it be safely established a 1.6-1.8mm restrictor? and what should be the length of the small part of the restrictor?

So I've been the guinea pig for this since I've been having the smoke issue from my turbo. I've tried all the different size restrictors and the smoking has stopped once I put this on.

https://www.atpturbo.com/mm5/merchan...egory_Code=RES

it's a .09mm restrictor. (.0035") I went with the 1.65mm from ATP then I found one that was 1.5MM which was suggested by Geoff, but it was still smoking. Geoff told me if the 1.5 still didn't work to go ahead and try the .09mm.

So I can confirm that there is no more smoke coming from my exhaust.
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Old 04-02-2018, 02:31 PM   #2409
sergey2007
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Quote:
Originally Posted by Subi114 View Post

it's a .09mm restrictor. (.0035") I went with the 1.65mm from ATP then I found one that was 1.5MM which was suggested by Geoff, but it was still smoking. Geoff told me if the 1.5 still didn't work to go ahead and try the .09mm.

So I can confirm that there is no more smoke coming from my exhaust.
Thanks for the info. If possible, specify the length of the thin part of the restrictor.
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Old 04-02-2018, 04:36 PM   #2410
Subi114
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Quote:
Originally Posted by sergey2007 View Post
Thanks for the info. If possible, specify the length of the thin part of the restrictor.
honestly I don't know but from your diagram that looks about right.
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Old 04-02-2018, 08:50 PM   #2411
Homemade WRX
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Quote:
Originally Posted by sergey2007 View Post
Thanks for the info. If possible, specify the length of the thin part of the restrictor.
You're going to want to look up orifice L/D ratio.
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