Rear e-diff retrofit to MY12 4.4 TDV8

**carlschmid2002** · 26th October 2016, 08:16 PM

Originally Posted by Graeme

An expensive retrofit compared with the original extra cost if buying new and perhaps no extra cost if buying s/h especially if the seller isn't aware that an e-diff is fitted.

I doubt my D4 V8 has ever seen a dirt road before I bought it. I still haven't activated the E-Diff.

**Graeme** · 26th October 2016, 09:02 PM

From observations done by my son Justin using his IIDtool, his e-diff engages to a degree every time his D4 drives-off even with TR in normal mode. It appears that e-diffs get a lot more use than expected.

**Grentarc** · 26th October 2016, 09:05 PM

Originally Posted by Graeme

From observations done by my son Justin using his IIDtool, his e-diff engages to a degree every time his D4 drives-off even with TR in normal mode. It appears that e-diffs get a lot more use than expected.

I was just about to post this information!

I might hook the IID Tool up tomorrow to log the e-diff on a normal drive.

**CSBrisie** · 26th October 2016, 10:45 PM

I can confirm this Graeme - the red padlock indicator on mine shows frequently when I'm off road with TR in any mode other than normal.

**isuzurover** · 26th October 2016, 11:47 PM

So apart from electronic troubleshooting, how do you confirm the diff is "locking" properly and the clutch pack isn't worn out?

Has anyone worked out how to shim them up tighter like people do with LSDs?

**Graeme** · 27th October 2016, 06:14 AM

The clutch packs are self-adjusting when a diagnostic self-test/calibrate request is issued by an appropriate tool.

A business in the USA that rebuilds the e-diffs reports that the clutch components are very robust, only requiring a good clean and new bearings and seals when moisture accumulates from inadequate oil changes in very cold conditions

**Grentarc** · 27th October 2016, 08:25 AM

Originally Posted by Grentarc

I was just about to post this information!

I might hook the IID Tool up tomorrow to log the e-diff on a normal drive.

Here is the log of a D4 e-diff on a normal drive to drop my son off at childcare this morning

[ame]http://www.waggafish.com/edifflog.pdf[/ame]

**Graeme** · 27th October 2016, 10:35 AM

Please explain!

I expect that the e-diff gets armed ready to prevent wheel-spin on every straight-line take-off - I doubt that it's fitted as standard equipment to SC L322s to maximise their off-road capability.

**Grentarc** · 27th October 2016, 10:39 AM

Originally Posted by Graeme

Please explain!

I expect that the e-diff gets armed ready to prevent wheel-spin on every straight-line take-off - I doubt that it's fitted as standard equipment to SC L322s to maximise their off-road capability.

There is only 1 standing start in that graph, all the rest were rolling starts, so it doesn't load up the diff as much - the standing start you can see goes up to almost 500Nm of lock, which was a gentle takeoff from some traffic lights. I will log another one now with similar distance, but will log it against speed as well.

**Grentarc** · 27th October 2016, 11:05 AM

Here is a screenshot of the log, the last log had steering angle to see if that affected diff loading, and this one has speed and current gear instead.
You can see that when starting from a standstill, the diff is loaded up to almost 500Nm - and all this is without any TR setting selected.

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