So what's the difference SDV6 & TDV6

[NOZ]

I've always had Defenders, so all this Discovery biz is new to me,

So can you tell me why we have the above ?

[Lotz-A-Landies]

AFAIK the difference between the TDV6 and the SDV6 is the performance. Both engines have twin turbos, but the later SDV6 (sequential turbo) has a higher output.

The sequential bit is that one turbo comes in earlier at low revs (and max'es out early) and the secondary turbo comes in at higher revs and continues through max revs.

[Graeme]

Note that the turbos on both engines are operated sequentially.

[NOZ]

So that being the case the SDV6 has a better tune ? Is that how it gets more power ?





Note that the turbos on both engines are operated sequentially.

[Graeme]

I assume that's the case but possibly more. LR had made the statement that the injectors were different but people discovered that the listed part numbers are the same, at least when the lower power engine was first released. AFAIK tuners can get increased power from the low o/p engines but don't seem to be able to simply replicate the SDV6's o/p so perhaps there is a mechanical difference. It would be easy enough for the engine builders to fit a lower o/p secondary turbo although LR has previously used other tricks such as inlet restrictors on other engines to limit power.

[Lotz-A-Landies]

So that being the case the SDV6 has a better tune ? Is that how it gets more power ?I think its probably a case of higher boost from the turbo/s, but don't quote me on that.

[Muskie]

hi Guys,
The SDV6 is tuned for a higher output of power. All components on both the TDV6 and SDV6 are identical, they're just programmed differently.

NOZ, if you want to get more power from your TDV6 so it matches that of an SDV6 pls contact Peter from Superchips NZ. He speciality is Land Rovers and Range Rovers and comes across the ditch once a month or so...

Good Luck!
Muskie

[NOZ]

I'm going to speak to the guys at Roo systems, but I'm not to worried about performance at this stage. It had bucket loads more than my old Puma.

[Muskie]

i wouldnt.......and LR AUST wouldnt cover the Roo System accessory under their drivetrain warranty....

[NOZ]

LR Aust choose what they will or won't warrant.

Mute point though as I'm not chasing performance

[isuzurover]

LR Aust choose what they will or won't warrant.

Mute point though as I'm not chasing performance

The word you are looking for is 'moot'
However back on topic, the company you mentioned would be my last resort...

[nat_89]

The word you are looking for is 'moot'
However back on topic, the company you mentioned would be my last resort...

Probably have to agree there!!

[NOZ]

Oops, a few to many beers mute , moot you got the picture :cool:

[TerryO]

From my experience tha last thing most people are after to many beers is ... mute!



... ;)

[Thehappyidiot]

I was advised to avoid the SDV6 3.0 and go with a TDV6 3.0 because the higher output was causing crankshaft issues.. I am looking at buying a D4, so it is of great interest at the moment...I wouldn't want the new bus to go mute on me..:-)
Anyone have any info on the in-service fail rate of the SD V6, and if it is statistically higher than fail rate of the TDV6 3.0?

[Nicky]

I was advised to avoid the SDV6 3.0 and go with a TDV6 3.0 because the higher output was causing crankshaft issues.. I am looking at buying a D4, so it is of great interest at the moment...I wouldn't want the new bus to go mute on me..:-)
Anyone have any info on the in-service fail rate of the SD V6, and if it is statistically higher than fail rate of the TDV6 3.0?

I've driven both for a week each. With similar use the SD V6 seems to use more fuel, so if it's economy you're after.....

[PeterOZ]

I always wanted to be able to mute my ex wife, never succeeded, probably why she is an ex :angel:

Now very muted hehehe :wasntme:

I'd love a new SDV6 D4 but the old MY08 TDV6 D3 will suffice. Actually since cleaning both the MAP and MAF sensors it has really got the bit between it's teeth.

[apom]

I've driven both for a week each. With similar use the SD V6 seems to use more fuel, so if it's economy you're after.....

Which was your preference? Did you feel disappointed after the SDV6?

[Nicky]

Which was your preference? Did you feel disappointed after the SDV6?

No, they are similar. Remember what they are supposed to be, an efficient modern all-purpose 4x4.

[eddomak]

Which was your preference? Did you feel disappointed after the SDV6?

I have the old MY10 SE (3.0L, higher output than the 2.7), which I believe (and don't mind being corrected) is the equivalent of the new SD. But I only have the 6 speed auto.

I have test driven the TD (3.0 lower output) with 8 speed gearbox, and around town (I don't tow) it seemed to have great pickup and go - hardly noticeable at all. But once on the highway, with some demands for overtaking, that was when I felt the difference with less pickup and go. Mind you it was totally sufficient, but just noticeable. I suspect that if you tow then it would make even more of a difference.

[jonesy63]

I've driven nearly all of them all - D4 2.7, D4 2.7 remapped (to 170kW), D4 3.0 6 speed, D4 5.0 v8, D4 3.0 6 speed, D4 3.0 TDV6 8 speed and D4 3.0 SDV6 8 speed - the biggest difference between them all IMHO is the 8 speed! :angel:

[discotwinturbo]

I was advised to avoid the SDV6 3.0 and go with a TDV6 3.0 because the higher output was causing crankshaft issues.

A search does not reveal this ? Where did you hear that ?

The SDV6 I thought is virtually unchanged since 2010 when it came in, but now with the tiniest bit of extra horsepower....but same torque.

Curious.

Brett....

[Graeme]

Smacks of someone trying to sell their LP 3.0 by denegrating the HP 3.0.

[scarry]

The main issue with the 3.0l were the turbos,a few threads on here about them.Body off job:(

Crank and bearing issue was the 2.7,D3.
The D4 2.7 has a different crank.

[Graeme]

Most of the early 3.0 turbo problems were due to LR not discontinuing the use of the scavenger pump for the secondary's drain soon enough when Jaguar had dispensed with it before LR started using the 3.0. Mine unnecessarily had the body off to have a turbo replaced and was lining up for another prior to me fitting the Jaguar drain pipe.

[Melbourne Park]

Towing a 2.4 tonne caravan, I got 11.9 litres per 100km. At about 94KMH. At 104, I got 13. At a mix of 110 and less, I got 13.7.

With the 8 speed SD motor.

With 10K on it. It might get even better I'm told. Amazing motor.

I've been told to map it - not sure I need the extra go, any advise?

[Bytemrk]

I'd say if you are happy with the current power.... why fiddle with it?

I know I won't bother with mine...

[kmdisco]

Thanks for the thread have enjoyed the comments.
I now know a little more about my Disco 4.SDV6 HSE. then I did before
it has enough power for me to handle at my age


Thanks Kev

[Melbourne Park]

I know someone though with an SD who had his ECU optimised; I think Ritter have the same optimisation available. Its from a NSW LR tuner ... he was wrapped in the improvements in his vehicle.

I also know an ex GMH auto engineer, who bought a new VX 200 series Toyota, and one of the immediate changes he did was to chip his motor. I asked why he did and he said: Because I am an automotive engineer!

Evidently there can be power and fuel saving available, but I've only met one person whose actually done it. And he was very enthusiastic about it.

On the other hand, the tune of my 8 speed is quite clever I think. I've read that the turbo has some lag - but in fact I think the ECU restricts performance when starting from stationary. I think this is perhaps done to save on differential and other driveline stress ... if LR allowed its torque to be there from stationary, IMO there would be a lot of stress on the drivetrain.

[joel0407]

This is a bit off topic but there are more reasons to remap than extrapower.

I believe most manufactures will do what they can to provide the best tunefor a motor but they also have their hands tied to meet stringent emission regulations.The problem being the tune to meet the emission regulation may not be the besttune for the engine for power or economy.

It's a bit like Mitsubishi tritons and Australia's regulatory requirment for stability control. It seems Mitsubishi has designed the Triton to work with traction control that appied brakes to spinning wheels much like LR traction control does. Then to sell the vehilce in Australia, the regs here say a vehicle must have stability control so Mitsubishi install a system that the vehicle was never designed to work with. A simple stabilty control will just reduce engine power when any wheel spins X amount faster than another. The end result is when you are climbing a steep hill and a wheel starts to spin, traction control starts working and applies brakes to the spinning wheel to drive the wheel that still has traction. Then the after thought stability control sees the spinning wheel and kills engine power right when you need it.

I know it's hardly related to engine power but just an example of how a manufacturer sells a vehicle that is not really the best but they have comprimised to meet regulation. Suporting why I believe the tune a manufacture may not be the best tune but it's a tune to meet regulations.

Happy Days.

[joel0407]

I should follow on from above with there are tunes and there are tricks.

Tunes are good, tricks are usually not.

A tune is complete remap of the ECU.

A Trick is something you install the harness that will modify the signal to the ECU so it behaves differently. An example of a trick is a small box that may sit between a boost pressure sensor and the ECU to fool the ECU into seeing less boost than there really is so the ECU keeps the waste gate shut and continues to add more fuel. Yes it will give you more power and possibly more economy as a result of the extra boost but it untimatly won't be good for your motor.

Happy Days.

[Thehappyidiot]

A search does not reveal this ? Where did you hear that ?

The SDV6 I thought is virtually unchanged since 2010 when it came in, but now with the tiniest bit of extra horsepower....but same torque.

Curious.

Brett....
Hi DiscoTwin,
I was told this by a mechanic who works for a LR dealership mechanical service centre...
I was looking at a few D3;s and 4;s, and I asked him what the real difference was.
Apparently the high output 180kW engines were based on the standard 2.7, bored and stroked for more output, but nothing beefed up in the downstairs department.
I got the impression that he thought the SDV6 engine was really meant for the lighter RR Sport, but that when they used it in the heavier D4, the extra weight showed up in bottom end problems.
Like you, I can't find anything about this in Dr Google, so I thought I'd ask the Guru's on AULRO..

[gghaggis]

Hi DiscoTwin,
I was told this by a mechanic who works for a LR dealership mechanical service centre...
I was looking at a few D3;s and 4;s, and I asked him what the real difference was.
Apparently the high output 180kW engines were based on the standard 2.7, bored and stroked for more output, but nothing beefed up in the downstairs department.
I got the impression that he thought the SDV6 engine was really meant for the lighter RR Sport, but that when they used it in the heavier D4, the extra weight showed up in bottom end problems.
Like you, I can't find anything about this in Dr Google, so I thought I'd ask the Guru's on AULRO..

The weight difference between a Sport and a D4 is negligible.

Cheers,

Gordon

[scarry]

Hi DiscoTwin,
I was told this by a mechanic who works for a LR dealership mechanical service centre...
I was looking at a few D3;s and 4;s, and I asked him what the real difference was.
Apparently the high output 180kW engines were based on the standard 2.7, bored and stroked for more output, but nothing beefed up in the downstairs department.
I got the impression that he thought the SDV6 engine was really meant for the lighter RR Sport, but that when they used it in the heavier D4, the extra weight showed up in bottom end problems.
Like you, I can't find anything about this in Dr Google, so I thought I'd ask the Guru's on AULRO..

Note also the 'bottom end' of the D3 2.7 is different to the D4 2.7.