John B Posted June 8, 2022 Share Posted June 8, 2022 I'm planning on installing an Air/Fuel Ratio gauge in my Caterham to keep an eye on AFR while on track. This requires welding a bung into my header after all four collectors merge into one, in other words on the side of the car. How does the wire from the O2 sensor get routed on Caterhams with catalytic converters? Underneath the car?? Link to comment Share on other sites More sharing options...
Vovchandr Posted June 8, 2022 Share Posted June 8, 2022 (edited) 9 minutes ago, John B said: I'm planning on installing an Air/Fuel Ratio gauge in my Caterham to keep an eye on AFR while on track. This requires welding a bung into my header after all four collectors merge into one, in other words on the side of the car. How does the wire from the O2 sensor get routed on Caterhams with catalytic converters? Underneath the car?? I routed mine underneath, past the tranny, going into the main wiring hole in the center arm rest. It wasn't an easy task to get it through. Also I haven't welded the bung just yet but actually used the rear o2 bung for my wideband. It being past the cat skews the ratings but still gives a good ballpark. From what I've been told values would be off by .5 to 1 which is close enough for me to have an idea of whats happening. Currently planning to remove the cat anyway. Using the rear achieves a cleaner look Edited June 8, 2022 by Vovchandr Link to comment Share on other sites More sharing options...
JohnCh Posted June 8, 2022 Share Posted June 8, 2022 Before you drill the hole for the O2 sensor, make sure you research proper mounting first. There are some rules of thumb regarding minimum distance behind the collector for accuracy and mounting angle for sensor longevity. As I recall the latter is at least 10% over horizontal, but not more than 75%, and is something that a lot of people (including my exhaust fabricator) get wrong. -John 1 Link to comment Share on other sites More sharing options...
Rosteri Posted June 8, 2022 Share Posted June 8, 2022 Over 10 deg from horizontal to avoid condensation dropping on tip, it is also fine to mount it fully vertical on a 7, as there are no hot air pockets since it is in free air. If you can select the heat up sequence I recommend a conservative profile (slow heat up), so the pipe clears of moisture before heating starts. Link to comment Share on other sites More sharing options...
John B Posted June 9, 2022 Author Share Posted June 9, 2022 Good advice. Thanks guys! Link to comment Share on other sites More sharing options...
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