 tuning carbs, O2 sensor |
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| 80cap |
 Nov 25 2017, 08:09 AM
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#1
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Member  Group: Members Posts: 317 Joined: 6-February 15 From: ohio Member No.: 18,405 Region Association: None  |
While I have my engine out I looking into installing a air fuel gauge. Has anyone welded two bungs in the headers so you get both banks. Also is the a gauge that can display (switch) each bank?
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| DaveO90s4 |
Nov 25 2017, 02:37 PM
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#2
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Member Group: Members Posts: 149 Joined: 26-April 16 From: Australia Member No.: 19,935 Region Association: None |
Not on 814 engine, but for the 6 cylinder with a carb throat per cylinder (pair of triple zeniths) I've Put an o2 sensor bung on each exhaust at tube - so 6 in all. Hope to be able to ensure each cylinder has correct afr. And then further back in the system another two, one on each secondary pipe - as you are suggesting. I won't be using 6 or 8 o2 sensors simultaneously though. Too expensive (for me).
In due course I may use one of the close to engine bungs to run a exhaust gas temp probe. Overkill probably. But easy to do while the exhaust system was being constructed. Dave |
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| PlaysWithCars |
Nov 25 2017, 03:02 PM
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#3
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Senior Member Group: Members Posts: 524 Joined: 9-November 03 From: Southeast of Seattle Member No.: 1,323 Region Association: Pacific Northwest 
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Check out this one.
Innovate Motorsports Dual AFR gauge I use their portable unit and have been happy with it. |
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| 80cap |
Nov 25 2017, 03:13 PM
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#4
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Member Group: Members Posts: 317 Joined: 6-February 15 From: ohio Member No.: 18,405 Region Association: None |
I did not realize they are that pricey. The only logical placement for the bungs is on the collector on the muffler just aft of the connections for a dual system.
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| RoadGlue |
Nov 25 2017, 09:44 PM
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#5
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Sonoma County Gear Head Group: Admin Posts: 2,033 Joined: 8-January 03 From: Santa Rosa, CA Member No.: 108 Region Association: Northern California
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I just bought their MTXL-Plus AF gauge w/ 02 sensor. It's pretty easy to make sure both carbs are running similarly, so I'm happy with just the one mounted aft of the collector on the muffler.
http://www.innovatemotorsports.com/products/mtxl_plus.php |
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| Mike Bellis |
Nov 26 2017, 03:15 PM
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#6
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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If you are getting one, make sure it is a wide band sensor. Narrow band sensors are only good for monitoring fuel economy and will not help much with tuning.
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