" Bosch widebands on one engine?

[Chris Wilson]

Going to run two Bosch LSU widebands on my RB26 Skyline engine, on stock (separate) manifolds. I am running an M800 with dual wide band enabled, and I have a single Motec PLM. Both wide bands have the big, wide connectors to plug straight into the PLM loom, but obviously i can only plug in one at a time. What's the neatest way to connect this lot up, are there any proper loom connectors available, or should I cut the plugs off the 2 sensors and make a loom? Just wondering if there's an easy and neat way to do this that lets me renew the sensors with no hassle in the future. I'd also like to be able to read each sensor on the PLM, selectively, is this easy to sort? Please keep it simple, I an stretched with all this technology Thanks.

[Dragon]

If you have dual wideband enabled on your M800, you do not need the PLM.
Just connect the two LSUs directly to M800 La1 and La2.
I would use 6 pin DTM connectors on each LSU.

[Chris Wilson]

Thanks for the reply. Having got a PLM I would like to view the fuelling, even if from just one sensor, but ideally switchable between the two, is that possible to achieve, or would it be a nightmare / impossible? Thanks

[MarkMc]

Hi Chris,
I am going to assume that you want to be able to have a display in the car from at least one sensor that does not require you to have the laptop there all the time?

You have a couple of options. Firstly you could always just put a third lambda bung where the two manifolds join, this would be an overall Lambda reading for the engine and you would have to remember that it may differ a small amount form the two individual ones at light load (becasue it is in a different part of the exhaust system).

Or you could just use one directly into the ECU and the second ECU lambda channel could be the PLM on CAN to the ECU. I do not like the idea of unplugging the Lambda sensors from the ECU when you want to look at the reading live through the PLM.

For the connectors I would probably just buy the LSU loom side connector from your MoTeC dealer and make the loom correctly. We use a lot of 6 pin DTMs, which is fine for us but when you have to put a new sensor in you need a supply of DTM pins.....and your set of Lambda sensors will be all different, the PLM loom as standard needs the standard LSU connector.

[Chris Wilson]

Here you say:

"Or you could just use one directly into the ECU and the second ECU lambda channel could be the PLM on CAN to the ECU. I do not like the idea of unplugging the Lambda sensors from the ECU when you want to look at the reading live through the PLM."

Would the ecu still see this as two Lambda sensors, exactly the same as running no PLM, and read them totally separately still? If so, that seems like neat way to do it. I don't suppose you have an opinion which Lamdsa sensor the PLM should read from, front or rear, do you?

Thanks for all your help, appreciated.

[BLN355]

Can the one 'Aux Output' control the heater circuits for two Wideband Sensors ?

[NathanS]

Each lambda sensor connected directly to a Mx00 ECU requires its own output to control the heater circuit, this is due to the fact that the temperature of each lambda sensor needs to be controlled to within a certain range to achieve good operation.

[Chris Wilson]

Do you think there's much advantage in running dual Lambda on an RB26 engine running twin turbos on stock manifolds, but NOT running dual air flow metering units, but instead running a MAP sensor set up? A single wide band would simplify things.... Thanks.