Marco79 Posted January 12, 2010 Share Posted January 12, 2010 I'm wanting to install a wideband afr gauge but I'm unsure on the best place to mount the sender. I've got nics manifold and from what I can think it would make sense to mount it right at the end just before the manifold joins the centre section so that it has all 6cylinders 'blowing past it' if that makes sense lol is my thinking right? All help greatfully appreciated Quote Link to comment Share on other sites More sharing options...
Andy Blyth Posted January 12, 2010 Share Posted January 12, 2010 If it helps, I had my boss welded into the exhaust close to the end of the 2nd cat, where it meets the cat-back. It's right on the outside of a bend, so it should get some good exposure to gas flow, even at idle. If you get your car into the air, you will find a very handy hole on the passenger side of the transmission tunnel. It's big enough to fit a lambda sensor through (once you pop the cover out). Once through the hole it's a direct line to the exhaust, giving an almost perfect mounting angle. The cable run will be short, meaning no fouling on the propshaft or catching on the ground. You can get to the hole by removing the centre console and pulling the carpet back. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 12, 2010 Share Posted January 12, 2010 The hole is indeed there for the second O2 sensor used on UK /European spec MKIV TT's Quote Link to comment Share on other sites More sharing options...
Andy Blyth Posted January 12, 2010 Share Posted January 12, 2010 The hole is indeed there for the second O2 sensor used on UK /European spec MKIV TT's Great minds... Quote Link to comment Share on other sites More sharing options...
Marco79 Posted January 12, 2010 Author Share Posted January 12, 2010 If it helps, I had my boss welded into the exhaust close to the end of the 2nd cat, where it meets the cat-back. It's right on the outside of a bend, so it should get some good exposure to gas flow, even at idle. If you get your car into the air, you will find a very handy hole on the passenger side of the transmission tunnel. It's big enough to fit a lambda sensor through (once you pop the cover out). Once through the hole it's a direct line to the exhaust, giving an almost perfect mounting angle. The cable run will be short, meaning no fouling on the propshaft or catching on the ground. You can get to the hole by removing the centre console and pulling the carpet back. wow cheers mate did you have to drop the system to weld the bung on or was there good access for welding? I need to take my manifold off anyway as having probs with dam gaskets blowing that's why I was looking at a mount point on the manifold Quote Link to comment Share on other sites More sharing options...
Marco79 Posted January 12, 2010 Author Share Posted January 12, 2010 The hole is indeed there for the second O2 sensor used on UK /European spec MKIV TT's It's as if it was meant to be lol Quote Link to comment Share on other sites More sharing options...
Andy Blyth Posted January 12, 2010 Share Posted January 12, 2010 wow cheers mate did you have to drop the system to weld the bung on or was there good access for welding? Since the point is on the 2nd cat / decat I just marked up using tippex where I wanted the boss mounting then took the decat off - it's only 4 nuts and bolts. The pipe will need a hole drilled in it before welding so I'm not sure if it's possible to do in-situ. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 12, 2010 Share Posted January 12, 2010 You can do it in situ with a TIG and a small back on the torch, but it's easier and probably better to just whip it off. Don't forget O2 sensors need the tip pointing down about 30 degrees so they don't get condensation building up in them! Quote Link to comment Share on other sites More sharing options...
Marco79 Posted January 12, 2010 Author Share Posted January 12, 2010 You can do it in situ with a TIG and a small back on the torch, but it's easier and probably better to just whip it off. Don't forget O2 sensors need the tip pointing down about 30 degrees so they don't get condensation building up in them! Thanks for that chris I hadn't even thought of that! Is it much work to get the centre console out? Or is it enough just to remove the gear surround and ashtray? Quote Link to comment Share on other sites More sharing options...
Kev.O Posted January 12, 2010 Share Posted January 12, 2010 If you peel back the passenger footwell carpet, you'll be able to see the grommet. There's no need to remove the centre console. Quote Link to comment Share on other sites More sharing options...
Marco79 Posted January 12, 2010 Author Share Posted January 12, 2010 If you peel back the passenger footwell carpet, you'll be able to see the grommet. There's no need to remove the centre console. Cheers kev mate that sounds a bit easier Quote Link to comment Share on other sites More sharing options...
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