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O2 sensor question
This may be a stupid question, but I'm planning on buying a AFR gauge. I have euro headers on my '87 930. I know there is an O2 sensor in the header system already, do I mount the O2 sensor, that comes with the gauge, separately or does it replace the one that's already on there? If separately, do I have to add a bung or is there an extra bung already there? If I have to add a bung, what is the best location, in the header system, for it(next to the turbo, or by the wastegate, or what..)? My car is currently at the shop having the engine and trans rebuilt, and I'm making some changes to the engine, such as going from 100mm drop-in cylinders to 98mm and going from 7.1:1 compression to 7.5:1, and I don't want to have to spend this kind of money again soon because the AFR's were off.
I'm considering the AEM 30-4100 gauge
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'87 930..Sold  '72 911T 3.2 MFI Twin Plug race motor, full cage, full coilovers, too many suspension mods to list, wide body, Fiske wheels, R888, fuel cell, fiberglass everything, 2091lbs  "You don't have to be CRAZY to own a sports car, but it helps" Last edited by 1SIK930; 02-11-2012 at 08:57 AM.. |
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02-11-2012, 08:45 AM
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Registered User
Join Date: Oct 2010
Location: Southern NH
Posts: 3,553
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when I ran my wide band O2, there was an analog out for me to use to tie into the factory circuit. The wideband also functioned as a factory O2 sensor.
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02-11-2012, 09:10 AM
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Ok, so I've done some more research, and I need to mount it past the turbo. I'm installing a RarlyL8 Zork tube. Will I have any problems with accuracy from an O2 sensor mounted in such a short pipe? Is this mounting ok?
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'87 930..Sold '72 911T 3.2 MFI Twin Plug race motor, full cage, full coilovers, too many suspension mods to list, wide body, Fiske wheels, R888, fuel cell, fiberglass everything, 2091lbs "You don't have to be CRAZY to own a sports car, but it helps" |
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02-12-2012, 04:53 PM
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Registered
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The zork is only 3in dia and Rarlyl8 ox sensor bung is close to the turbo, I don't think that you will have any issues at all? Look at your instructions for the sensor, I would recommend building a heat shield as per their instructions (at least mine showed how to make it), there is a lot of heat just passed the turbo.
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David 1985 Black 930, K27 7006, Garretson Intercooler, Adj boost, TB: 23 - 31mm, bielstein sport shocks, ER polybronze bushings front and rear, ER monoball joints front and rear with offset camber plates, 935 X triangulated strut brace, raised spindles, racing bump steer kit 1981 Black 911sc (sold) |
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02-12-2012, 08:57 PM
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Smart quod bastardus
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In a zork since its so short you may have reversion at idle and low exhaust flow so dont be surprised if idle readings are off. Maybe, maybe not.
However, once you're moving and have some exhaust flow the reading should be accurate. You dont want the O2 sensor mounted before the turbo because it will burn up. Making the heat sink is a good idea too. Innovate motorsports has good instructions on how to mount this under the sensor. Make it out of copper if possible. Fred
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, full bay intercooler, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.95 bar max ---"When you're racing it's life! Anything else either before or after, is just waiting" |
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02-13-2012, 09:50 AM
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Smart quod bastardus
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You need to post the dyno results when you get this thing finished.
I am interested in seeing what kind of power your mods put out. Good luck, Fred
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, full bay intercooler, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.95 bar max ---"When you're racing it's life! Anything else either before or after, is just waiting" |
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02-13-2012, 09:52 AM
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1SIK930 Sold
White Lightning
Teeter Totter
1981 Porsche 911 sc (sold)
1985 Porsche 930
Herman the German
