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Home > Technical (L322) > Restricted Performance Fault TDV8 4.4 - 1750 rpm on Motorway
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Dave lincs



Member Since: 31 Dec 2021
Location: louth
Posts: 39

United Kingdom 

Same here as well

Post #632739 24th May 2022 7:07am
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mjdronfield



Member Since: 04 Nov 2011
Location: Derbyshire
Posts: 7605

United Kingdom 2011 Range Rover Vogue SE TDV8 Buckingham Blue

I wonder if having the cruise on alters what gear it might be in, or will drop early on an incline where you wouldn’t normally?

Could swap it in to top using the paddles? Just to get the rpm difference out the way of your investigation, one way or the other….

Thumbs Up 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
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Post #632747 24th May 2022 8:02am
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JayGee



Member Since: 27 Jul 2021
Location: London
Posts: 2570

United Kingdom 2012 Range Rover Vogue 4.4 V8 Orkney Grey

The OP stated they had used the paddles to check it was in 8th. Unless they are running very undersized tyres then the only plausible explanation is the TC is slipping or not locking. On the other hand if it was a 3.6 that rpm would be right for 70 but that can’t be an explanation can it….? 2012 TDV8 Vogue (L322)

Post #632750 24th May 2022 8:10am
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mjdronfield



Member Since: 04 Nov 2011
Location: Derbyshire
Posts: 7605

United Kingdom 2011 Range Rover Vogue SE TDV8 Buckingham Blue

And the 3.6 would be in 6th….

Thumbs Up 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

Post #632751 24th May 2022 8:23am
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JayGee



Member Since: 27 Jul 2021
Location: London
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United Kingdom 2012 Range Rover Vogue 4.4 V8 Orkney Grey

The OP said ‘top’. Also no paddles on the 3.6 unless they have been added as a modification. 2012 TDV8 Vogue (L322)

Post #632752 24th May 2022 8:25am
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mjdronfield



Member Since: 04 Nov 2011
Location: Derbyshire
Posts: 7605

United Kingdom 2011 Range Rover Vogue SE TDV8 Buckingham Blue

Ah, apologies. Not read it all. Trouble when replying when at work 🤣.

Thumbs Up 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

Post #632764 24th May 2022 10:44am
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Mike Edwards



Member Since: 13 Feb 2021
Location: Northampton
Posts: 223

United Kingdom 2013 Range Rover Vogue SE SDV8 Causeway Grey

Suspect you guys are heading down the wrong road.

I did say “ in the low to mid 70 mph range”. I also corrected myself earlier and said the rpm was closer to 1600. Topic title also points out it is the 4.4 engine.

Post #632826 24th May 2022 10:07pm
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JayGee



Member Since: 27 Jul 2021
Location: London
Posts: 2570

United Kingdom 2012 Range Rover Vogue 4.4 V8 Orkney Grey

OK thanks for the clarification but 1600rpm still seems high for that speed - can you confirm you are running stock 255/50 tyres on your 20" wheels? Listening to the sound of your engine in the other thread I'd be looking at this as a priority for a restricted performance warning possible cause. 2012 TDV8 Vogue (L322)

Post #632834 25th May 2022 6:33am
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Discotigger



Member Since: 12 Feb 2013
Location: Cumbria
Posts: 804

United Kingdom 2012 Range Rover Westminster TDV8 Orkney Grey

Have you had a look at the 4 rubber hoses that go into the Intake Plenum, the large plastic 'donut' that sits underneath the big plastic engine cover. It's possible you have a minor split on one or more of the hoses that is allowing a little bit of air to escape from the intake, causing higher revs due to loss of turbo boost.
Take off the cover and have a good look over the hoses, see if there are any signs of soot or oil / gunk around the hoses. If you post a photo on here, we'll be able to tell if you've still got the old LR rubber hoses which have caused 99% of the problems you describe.

Post #632852 25th May 2022 10:08am
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JayGee



Member Since: 27 Jul 2021
Location: London
Posts: 2570

United Kingdom 2012 Range Rover Vogue 4.4 V8 Orkney Grey

Loss of turbo boost won't change the revs vs road speed ratio as these are mechanically locked (assuming the TC is not slipping) 2012 TDV8 Vogue (L322)

Post #632856 25th May 2022 10:24am
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Mike Edwards



Member Since: 13 Feb 2021
Location: Northampton
Posts: 223

United Kingdom 2013 Range Rover Vogue SE SDV8 Causeway Grey

JayGee wrote:
OK thanks for the clarification but 1600rpm still seems high for that speed - can you confirm you are running stock 255/50 tyres on your 20" wheels? Listening to the sound of your engine in the other thread I'd be looking at this as a priority for a restricted performance warning possible cause.


The noisy engine is a different vehicle.

Nothing has changed tyre wise for quite a few months.

Post #632866 25th May 2022 1:41pm
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Mike Edwards



Member Since: 13 Feb 2021
Location: Northampton
Posts: 223

United Kingdom 2013 Range Rover Vogue SE SDV8 Causeway Grey

After a period where I wasn't getting any error codes I'm now getting the usual set, i.e. manifold absolute pressure and turbocharger boost pressure low.

Post #635305 23rd Jun 2022 8:11pm
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