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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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where to put O2 sensor
I have my header off and for sale and was going to have the joint where all the pipes come together at the turbo tig welded but I would like to add a place where I can measure exhaust gas back pressure.
I was going to put the bung right there below the turbo but I was thinking the better place to know the exhaust back pressure might be at #3 or 6 exhaust port since the pressure of the exhaust going back into the cylinder is critical. I have seen a back pressure gauge on the 935. Where do they measure it. If i don't sell the header soon I may change the cams since I have the engine out
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold Last edited by T77911S; 08-06-2015 at 08:10 AM.. |
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08-06-2015, 04:06 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,125
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Anywhere before the turbo is all you need since pressure is equal throughout all places. If someone has a better reason to place elsewhere, I'm all ears.
Do you mean exhaust backpressure, or AFR's??? 
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, depending on mood  , Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
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08-06-2015, 07:24 AM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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Back pressure. Curious what is. Could effect what cam put in there.
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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08-06-2015, 08:12 AM
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