Thread: Diesel Tuning Chip for Land Rover Discovery 4

Originally Posted by Dougal

I had the EGR mapped closed

I would have this today for my 3.0 if it was available but no other changes.

Originally Posted by Dougal

If you want the engine to last longer and use less fuel, then a performance remap is the last thing you should do.

As a generalised statement, this is completely true - I would hope most people considering a performance boost would keep this in mind.

Originally Posted by Dougal

Thanks for letting me know about the link, I've fixed it and it's here too: http://www.zf.com/media/media/produc..._DataSheet.pdf
This is an official ZF document showing the 6HP28 only goes to 650Nm in it's best form.
I'll take official information over people bandying about figures on the internet every time.

You're welcome. If you look at the top of the ZF pages, it says "standard". If you look at the Ford or LR tech pages, they say "upgraded". Both official documents.

Originally Posted by Dougal

Where did you find this 600C figure? Have you monitored your own under sustained load?

From the Land Rover Topix technical data. An official document ............

Cheers,

Gordon

Originally Posted by gghaggis

You're welcome. If you look at the top of the ZF pages, it says "standard". If you look at the Ford or LR tech pages, they say "upgraded". Both official documents.

Does that document show any torque ratings?

Originally Posted by gghaggis

From the Land Rover Topix technical data. An official document ............

Cheers,

Gordon

For which sensor was that? You said there were 3 of them and the temperatures on each will be significantly different. Post turbo the coolest of the lot.

There's a temp sensor for the primary turbo but from the wiring schematics I can't positively determine whether its pre or post turbo as its description 'Outlet temperature - fixed turbocharger' could possibly be interpretted as combustion chamber outlet. The other 2 are pre and post catalytic converter and another 2 pre and post DPF, presumably only if a DPF is fitted.

Originally Posted by Dougal

If you want the engine to last longer and use less fuel, then a performance remap is the last thing you should do.

I had a custom map written for one of my cars (not a landrover) which is tdi with a DPF.
I had the EGR mapped closed, the timing advanced a few degrees and torque limiters raised, but fuelling and boost limits remaining exactly where the factory left them.

I gained about 8% fuel economy, with the EGR shut it can't stick open and less soot heads towards the DPF. The torque curve is a little fatter (I'm wearing the risk on manual gearbox and clutch) but the turbo doesn't work any harder and the EGT isn't any higher.

The downsides:
Warmup takes a lot longer. In winter I blanket the intercooler and radiator to help this. It takes about 5km of open road driving to hit normal water temp. In traffic it likely wouldn't get to operating temp in winter.
The engine is a bit noisier.
I have shortened the interval for clutch and DMF replacement.

I used a tuner in Greece for this, I pulled the original map and sent it off with specific instructions. I then reloaded it and tested it.

All of the mainstream tuners I tried only wanted to sell me their performance maps which put torque up by about 30% and would fill up my DPF filter with soot in a very short time. Not to mention the risk overspeeding and killing a turbo at 2000m altitude

If you want to go off topic and talk about other vehicles other than the Discovery 4, then here's my comment on chips for a TD5 Discovery 2, I had a chip on my D2 and the engine was perfect when I sold it at 320,000ks.

Really your re-map is irrelevant considering we are talking about the D4, the D4 can't have the EGR Blocked/bypassed as far as I;m aware, some D4s can't even have a re-map, plug-in map, or re-map done on the bench, according to B.A.S in the UK and Davis Performance here.

Also clearly the 3.0l D4 will take an increase in power and torque, well at least the single turbo and 2.7l will, going on the torque figures supplied by GGhaggis for the gearbox on those two models, besides all the tech jargen, driven sensibly the car should last as long as a standard car, just my thoughts.

Baz.

Originally Posted by Redback

If you want to go off topic and talk about other vehicles other than the Discovery 4, then here's my comment on chips for a TD5 Discovery 2, I had a chip on my D2 and the engine was perfect when I sold it at 320,000ks.

Really your re-map is irrelevant considering we are talking about the D4, the D4 can't have the EGR Blocked/bypassed as far as I;m aware, some D4s can't even have a re-map, plug-in map, or re-map done on the bench, according to B.A.S in the UK and Davis Performance here.

It's completely relevant as the tuning options for all bosch EDC diesels are the same.
That is exactly what you need to do if you want a remap for engine longevity and best fuel consumption without extra stress on the engine, turbochargers and driveline.

If the D4 can be remapped, then the EGR can be shut-down. If the tuner can't do that, then you might need to find another tuner.
Mapping the EGR out (turning it off the ECU instruction set) is completely different to simply blocking or unplugging it.

Originally Posted by Redback

Also clearly the 3.0l D4 will take an increase in power and torque, well at least the single turbo and 2.7l will, going on the torque figures supplied by GGhaggis for the gearbox on those two models, besides all the tech jargen, driven sensibly the car should last as long as a standard car, just my thoughts.

Baz.

Based on the torque figures he heard from someone else on the internet? I'd love to see an official document with a 720Nm torque rating, but right now the only official docs have 650Nm on them.

Originally Posted by Graeme

I would have this today for my 3.0 if it was available but no other changes.

Have you asked any tuners about "eco" maps? They are essentially the same thing (shutdown EGR and advance timing with no power/torque increase). There were none commercially available for my vehicle so I had to instruct the tuner to make my own. With a few of my own tweaks.

Originally Posted by Dougal

The gearbox should be fine. You've still got all the engine concerns.

Then it should be fine to take the D4 SDV6 from 183kW to 215kW, as that's what LR does with the same engine in the RR Sports SDV6.

I gather some of that could also be due to our poorer fuel, as even the 183kW gets 188kW in EU guise (as stated by the engine sticker).