Lambda probe connectors

[blitzracing]

Anyone know what the technical Lucas name for the three pin Lambda connectors are, or where I can get some ? (male and female). Im 90% complete on a 20 LED display to monitor the lambda output but dont want to splice the loom.

Thanks

[GreenV8S]

Don't want to rain on your parade but trying to show a proportional lambda reading from a narrowband sensor is more or less a waste of time. If everything is working correctly it'll just toggle between 'rich' and 'lean', and if it isn't then the lambda readings will be pegged anyway.

[spend]

They had 'more or less' on the brain in the design office that day

Dave

[blitzracing]

Not strictly true as the map run open loop above 2500 rpm, so even with a narrow band sensor it can still show a tendency towards rich or lean, even if its off the end of the lambda curve. Ive been running a gauge and lambda probe (not a rover one however ) on my car for some years, (non cat setup) and its been very usefull. Even my narrow band unit shows from 15:1 A/f to 12:1 Im now just building the electronics to run of the resistive range rover unit that you could just plug in and go. It would help get the mid point for the base fueling spot on, and wouldn't you like to know if those expensive after market chips actally perform better than the stock units?

Mark

[GreenV8S]

A standard Zirconia narrow band sensor has an effective range of about +/- 0.03 lambda. It basically says 'rich' or 'lean'. With care you can use the rich/lean duty cycle to see how much correction the closed loop system is applying, and out of closed loop you can tell whether it's richer or leaner than stoic, but that's all it tells you.

There are plenty of cheap (and some not so cheap) narrowband displays on the market and they are all extremely limited in their capability (in other words pretty much a waste of time).

Wideband displays aren't particularly expensive and if you want to know how rich your engine is running that's the way to measure it.

All you can sensibly do with the narrowband system is (a) confirm that the signal is cycling fast enough in closed loop mode i.e. it's all working and (b) confirm that it goes rich when the system is open loop. Both things that you can do very easily during servicing with an analogue volt meter with the probes shoved into the back of the connector.

[blitzracing]

Your no fun, I though a bank of flashing LED's much more interesting than my DVM (and faster response). Fair enough on the Rover probes, but Ill still give it a go and see. Its pure folly.

Mark

[GreenV8S]

DVM is no good for that, you need an oldie fashioned analogue meter.