Really, that would suggest the valve is not, in fact, open then.

Obviously, if they are open under those conditions, they shouldn't be. Visiting from DISCO3.CO.UK
2006 Discovery 3 TDV6 Auto HSE Zambezi Silver

Are you misinterpreting my last post? The references to 30 and 90 are MPH not % EGR valve opening.

The EGR valves appear to open and close as normal except for the occasional inappropriate momentary close when cruising. 2008 MY Java Black TDV8 HSE

No, I was referring to the fact that the valves appear to sit at 56% (i.e. partly open) but yet you have no symptoms of this.  Visiting from DISCO3.CO.UK
2006 Discovery 3 TDV6 Auto HSE Zambezi Silver

LFW- Have you ever monitored live EGR values on a TDV8?

If yes - what did you see? 2008 MY Java Black TDV8 HSE

Afraid not. I would assume that they should all function in the same way - i.e. open at idle but should close once you apply throttle. They can't be intended to be open under load. Visiting from DISCO3.CO.UK
2006 Discovery 3 TDV6 Auto HSE Zambezi Silver

Err... Did anyone say the EGRs are open under load - I certainly didn't.

So far as I can determine from reading about EGR function it is not binary. Perhaps some early versions functioned that way but the TDV8 appears to have the latest and most sophisticated design whereby the operation of the valves is entirely under electronic control of the ECM.

It is normal for EGRs to be partly open under cruising conditions, closed on WOT and close to fully open on a trailing throttle this is what the live values show.

What the live values actually indicate is I believes the 'commanded' EGR position I.e. not the 'actual' position necessarily. 2008 MY Java Black TDV8 HSE

Quote:

Err... Did anyone say the EGRs are open under load - I certainly didn't.

Quote:

So far as I can determine from reading about EGR function it is not binary.

Quote:

What the live values actually indicate is I believes the 'commanded' EGR position I.e. not the 'actual' position necessarily.

The IID shows both the actual and commanded positions for the TDV6 so I would have assumed, if they were command positions that they would be labelled as such but, that may well be the case.

Have you seen anything of significance in any other live values yet?

 Visiting from DISCO3.CO.UK
2006 Discovery 3 TDV6 Auto HSE Zambezi Silver

ONE FOR THE NERDS

Well........

Had a go at logging data with the new IIDBT version yesterday. The manual is shall we say not 'comprehensive' when it comes to describing how it all works but think I've muddled through it more or less.

Went for little meander around some local A and B roads and logged:

Torque Converter status
EGR valve 1 position
Intercooler outlet temperature
Gearbox coolant temp
Engine coolant temp.

The EGRs and TC are certainly very active there aren't they - and they do seem to correlate, in parts.

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hit the 'record' button and start a stopwatch and stop it at the exact time the 'jolt' occurs.

This is just the sort of thing I was wondering about the other day - Perhaps a button could be built in to the app as a sort of live value for this purpose?

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On the whole though - fantastic piece of kit. For anyone thinking of taking the plunge I'd say getting the Bluetooth version is the best way to go if you are interested in live values.

And even more improvements coming soon including the ability to set live value and CCF presets  Visiting from DISCO3.CO.UK
2006 Discovery 3 TDV6 Auto HSE Zambezi Silver

OK so had a go yesterday at some advanced data logging:

Set up the IID Tool with the live values and then got onto the M25 when cruising at a steady speed hit the 'record' button and waited for the jolt to occur. When it jolted I stopped the recording a few seconds later. The resulting log is linked below. The log very clearly shows the TC unlocking suddenly and then locking again all in a second or two.

I don't think the other values show the reason for the TC unlocking inappropriately so I'll! need to try some other live values perhaps gearbox voltage, gearbox oil pressure etc to see if it something going on in there. Alternatively or if nothing shows up I could log some more engine values.

The search goes on but it's good to have captured the TC misbehaving!

http://www.rrsport.co.uk/gallery/albums/us...33_Log.pdf 2008 MY Java Black TDV8 HSE

Interesting that the two EGR traces aren't exactly synchronous. I'd have thought they'd be the same all the way through. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Thanks for the input.

Are you looking at the right traces? The EGR recording for valves 1 and 2 are the red and blue ones. Maybe you spotted something I missed but they look identical to me.

What has surprised me is that the log shows the EGR valves to be almost constantly changing. Don't know if this is normal because no-one can show me a comparative log yet.
My suspicion is that something is causing the TC to unlock and the EGR valves are just reacting to that but obviously can't be sure. 2008 MY Java Black TDV8 HSE

The red EGR trace seems to be slightly more "active" than the blue one, certainly it shows peaks in places that the blue one is flatter - admittedly these are 1 second differences so maybe that is within tolerances as it's usually within 5% of the blue one. One particular moment of interest is at 423s. They both close but the red one blips back open to 35% momentarily. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Interesting graphs and I will look for the same 'feature'.

Also impressed that you were doing 65,000 mph or more.

As the TC mode changes with CC engaged it would be worth monitoring the cruise control mode, just in case that is providing a momentary input to the ECM. Land Rover - Turning Drivers into Mechanics Since 1948

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Thanks for the comments gents. I was hoping Robbie might pick up on this thread!

I have found that 65,000 mph is a good cruising speed as the unmarked police cars on the M25 are easily outrun.

As for using the ACC I've experimented with it and found the jolt occurs just the same despite the allegedly different TC and gearbox mapping. Also tried sport mode and again the jolt still occurs.

I noted however that the GAP IID manual warns against using CC whilst data logging.

Going back to the log of the EGRs I'd very much like to see a log from another TDV8 as the values do seem a bit odd in that they change a lot more than one might expect even on a steady throttle. 2008 MY Java Black TDV8 HSE