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Lambda boss position?


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Just been crawling around under the 110 looking at the exhaust with a view to welding in the boss for the lambda sensor. The exhaust is a Double-S 'sports' system (which vaguely fits without fouling too many bits of the chassis...), 4 into 1 headers then a Y pipe into a single 3" pipe. Fitting the lambda sensor into the Y is virtually impossible due to the way the Y is made with a welded seam right through the centreline of where the boss would go. Putting the sensor just aft of the Y is an option but access is very tricky and taking apart the system would be a right ar$e, not least because it's wrapped in exhaust insulation. About 3" further back down the system (about in-line with the handbrake drum) and the Y joins to a section of straight pipe which would be really easy to take out and weld the boss into. Bearing in-mind that I'll be using a 4 wire heated sensor, is this too far back down the system for valid readings? I think it should be fine as it's still quite a few feet and a silencer from the end of the pipe and the sensor heater, along with the exhaust lagging, means things should still be hot enough at that stage. Any thoughts?

Cheers,

Andy.

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Andy,

The closer you can get it the Y bit the better, but where you are suggesting will be OKay,

but you'l need time even as a heated unit for it to come on line so to speak

You can also weld a Steel bung onto stainless (in case you were wondwering :lol:)

Nige

Cheers Nige. I'd pretty much decided to put it in the straight as getting the Y piece out is just too awful to contemplate. So far as welding I was going with a stainless boss into a stainless tube with mild steel wire - no idea if it'll work but if I can get away without buying a reel of stainless wire I'll be happy ;-)

Andy.

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