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Registered
Join Date: Nov 2005
Location: eastern pa.
Posts: 232
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2nd o2 senser on ssi conversion?
I'm considering replacing my stock exhaust with either ssi or 993 heater boxes and want to know, do I need a second o2 senser , and if so how is it wired?
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08-21-2006, 04:07 AM
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Registered
Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,550
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You don't mention the 911 model or year that you're working with...but if you only had 1 sensor that reads a combination of 3 cyls' mixture...you don't need a second sensor. I guess this would be a different answer if you originally have a "fore" and "Aft" pair of sensors so differential readings are "fed back" to the computerized engine controls. In that case....if you "had" 2.... you'll still need 2.
- Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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08-21-2006, 08:28 AM
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Join Date: Nov 2005
Location: eastern pa.
Posts: 232
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Sorry it's an '87 3.2
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08-21-2006, 10:17 AM
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Registered
Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,550
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So...I think you can use 1.....
Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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08-21-2006, 10:46 AM
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Join Date: May 2004
Location: Encinitas (San Diego CA)
Posts: 4,495
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993 HEs don't have a bung for an O2 sensor. The O2s sensors are after the HEs. I had two bungs added to my muffler immediately following the HEs. I use one for the computer and plug the second, but planned to install a WideBand O2 sensor for tuning.
993 HEs should result in less backpressure and more HP than SSI, possibly at the expense of mid-range torque, depending upon your engine displacement and cam selection. You can see the O2 sensor and capped bung in this photo: Ben from M&K Exhaust made the muffler. He posts as MB911 on this board. 
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1971 RSR - interpretation |
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08-21-2006, 10:58 AM
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