R32 rear lambda removal of wiring after ECU tweek

I'm doing this now. I've got the 2 6 pin plugs labelled as the front ones and the 2 4 pin plugs as the rear ones, first off is that right?

I plan to remove the wires as far back as poss and cut off somewhere near the ECU plug.

 

Makes sense to me that the rear ones would have fewer connections than front ones. Rear ones presumably heated 'conventional' oxygen sensors, front ones wideband, which always have 5 pins or more AFAIK.

 

I sent Ian a picture of the ones that are not used, I will upload here when i get a second. The 4 pin Brown and Black ones are the rears so not used. I never found time to cut them out and my front pair are way to long!lol

 

Yes, regarding the wires - I personaly have a massive length

 

ive probably taken a good 18inches out from my loom and it was still to long for the lambdas lol

 

It makes you think where the hell they route it standard!

 

I could wrap my downpipe with it lol

 

Where have you all located your ecu?

And for a daft question (no thread is complete without one), which is the drivers side one?

 

Mine is in the scuttle, towards the driver side
Dils mk3 is off centre toward the passenger side
Aminder yours is the same I think

Lambda orientation won't matter- VAGCOM will call you a plonker when you plug them in the wrong way, and all you have to do is swap the plugs around at the top

 

black offside bank, brown nearside bank, and the ecu has fits if you get it wrong lol

 

Yes I have my ECU in the scuttle also on the drivers side. A little bit of work to get it to fit but it does. The scuttle cover is a PITA to fit over it if you are going to run one.

 

Did I read that right, you've had the ecu tweaked and now removing the rear lambda? One of the best points of the R32 ECU's is the continuous monitoring functions in my opinion, makes it stand head and shoulders above the older ME ECU's.
Or do you mean you have had functions switched off, is this an older model conversion with de-cat or something?

 

Rear lambdas, are requirement on EOBD and OBD 2 pollution controlled vehicles. They are used to maintain cat efficiency and EOBD/OBD cat monitors. The process is, the feed forward bias (lambda swing between 0.97-1.03) is calibrated at the OEM, to deliver the highest conversion efficiency of THC, CO and NOx. The conversion of these gases also correlates to a rear voltage to determine oxygen storage, which is calibrated as a setpoint for each speed load condition, until COP or WOT. If the catalyst has excess oxygen storage, and you were not lifting for a fuel cut, this rear voltage would be compared with a set point and a small rich hold would be applied to the bias of the front sensor, the get the catalyst back the best conversion efficiency.

In conversions such as Ian's, Taks, this feature is not a requirement as they do not run catalysts. So while the front UHEGOs are still required, the rear HEGOs can be removed, both physically and also in the calibration. Once complete, the diagnostic fault paths and feature actions are then made redundant.
The same is done with the cat heating feature and related SAI, as there is no cat to warm up so we switch that off and improve the fuel economy and driveablity!

ME7 ( not just R32s) ECUs are EOBD devices and so all have the same OBD2 and EOBD emission monitoring requirements.

 

Damn Eddie, I was just about to say that!




lol

 

Same here, took the words right from my mouth

RBPE, its an engine that's been out into a Mk2

 

Too slow...boo!