From what I understand the engines for Range Rover and Jaguar are effectively the same

The Range Rover produces 180kw (245ps) and 600Nm
The lower Jaguar (on the XF) produces 177kw (240ps) and 500nm
The more powerful Jaguar produces 202kw (275ps) and 600Nm

So what is effectively the difference between the 3?

And would it be wise to "chip" a new RRS to 202kw (more power than the TDV8 - although only just)?

Thanks
Tony

RRS is different because Land Rover has retuned the engine to be suitable for off road use - try taking an XF where you can take an RRS TDv6 and you will plainly see the difference..................... 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
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Yep, physically the same engine but different maps for different uses  

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The RRS has a different AWD. A RRS need power for AWD the Jaguar need power for speed and acceleration.

Jaguar is RWD not AWD! Xtype had 4WD but not XF 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
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The new ediff on the XFR and XKR is taken from the Disco/RRS.... 2010MY Land Rover Freelander 2 HSE
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I believe the RRS engine is based on the high output TDV6 lump but as Tim said, retuned for the needs of a 2.7 tonne 4x4. I think the RRS has more torque than the XF. Runner up - 2009 Best Avatar Award
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It is also engineered to be able to operate at strange angles that Land Rovers are able to get to that Jaguars couldn't even dream about getting to, and still be able to normally lubricate the oily bits at these silly angles. IIRC ALL Land Rovers engines are engineered to stay running at 48 or 50 degrees across a slope and up and down a slope - apparrently no other SUV can operate at angles more than 40degrees. Standrad max imum is a 45degree cross slope and you don't want to go there intentionally in 2.7tonnes of luxury car, and if you do you are recommended to put the suspension into access mode to lower the centre of gravity of the car and to remove anything you have on the roofrack! I also believe the air intakes on the LR version are different and the new TDv6 will look cool in G4 guise as it has an intake for each bank of the V so that means either a raised intake on each wing or a very complex sealed breathing system to one raised intake! There are no dummy intakes on the 3.0ltr TDv6 like the 2.7 has 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

think i will leave as standard then.

less than a week now till the car arrives