Member Since: 10 Mar 2015
Location: Melbourne
Posts: 140
Single turbo only
Why would a car of this capability be restricted to a single turbo in the V 6 version?
12th Jun 2017 5:38 am
Russell
Member Since: 23 Aug 2007
Location: Kent
Posts: 10564
Because it doesn't need a twin turboMY17 D5 1st Edition Namib Orange
MY15 D4 HSE Kaikoura Stone
MY12 D4 HSE Nara Bronze Sold and gone
MY11 D4 HSE Stornaway Grey Sold and gone
D3 S spec Silver Sold and gone
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12th Jun 2017 10:08 am
Nikki
Member Since: 10 Mar 2015
Location: Melbourne
Posts: 140
with this logic, the D5 also doesn't need 6 cylinders, whereas the D4 needed 6 pots and 2 turbos. Is LR becoming minimalist due to taxes?
12th Jun 2017 1:14 pm
J77
Member Since: 03 Mar 2008
Location: Fife
Posts: 6272
I believe the D4 only used the 2nd turbo at high revs.
It's worked in the Range Rover for a few years. The D5 needs 6 cylinders, the 4 cylinder diesel isn't that great.23.5MY Defender 90 X-Dynamic SE D250 MHEV Pangea Green
12th Jun 2017 2:24 pm
adam
Member Since: 20 Sep 2005
Location: Home and Happy
Posts: 6917
2nd Turbo kicks in at c.2500 RPM I believe, which equates to a cruising speed that's illegal in the UK, - but gives a nice kick (and not so nice puff of smoke) on acceleration
12th Jun 2017 2:48 pm
Russell
Member Since: 23 Aug 2007
Location: Kent
Posts: 10564
D5 gives better kick with just the one turbo, go drive one and you will see what I mean and yes the 4 pot is a waste of time in my viewMY17 D5 1st Edition Namib Orange
MY15 D4 HSE Kaikoura Stone
MY12 D4 HSE Nara Bronze Sold and gone
MY11 D4 HSE Stornaway Grey Sold and gone
D3 S spec Silver Sold and gone
Tow bar, full length roof bars, side steps, tow bar storage unit, surround camers.
D4 camera club
13th Jun 2017 1:45 am
Red Merle
Member Since: 30 Aug 2014
Location: Liskeard
Posts: 7441
Re: Single turbo only
Nikki wrote:
Why would a car of this capability be restricted to a single turbo in the V 6 version?
It does create a hole in the power output beneath around 1400 rpm that isn't there on the twin turbo version. Oddly, it's the same on the FFRR and the RRS too.
They do have a significantly lower CO2 output than the twin turbo in the official test and wonder if this might be the reasoning behind it?2011 - 2015: 3 x FL2
2015 - 2017: 2 x D4
2017 to date: FFRR SDV8
2023 to date: 2 x FL2 as “second” cars 🙄
2021 to date: Hinckley built ‘14 Triumph Trophy 1200
2022 to date: Hinckley built ‘14 Triumph Trophy 1200 & sidecar!
(One of only two known to exist in the world!)
24th Jun 2017 5:09 am
J77
Member Since: 03 Mar 2008
Location: Fife
Posts: 6272
Can't say I've noticed much differences in performance between the TD6 and the SDV6. I would say there is some hesitation when pulling away but I have experienced this in the D4.
Would've liked the SDV8 as there is plenty of room under the bonnet but no doubt would've pushed the price through the roof.23.5MY Defender 90 X-Dynamic SE D250 MHEV Pangea Green
24th Jun 2017 6:44 am
Red Merle
Member Since: 30 Aug 2014
Location: Liskeard
Posts: 7441
Do you notice the gearbox taking an additional down-change when pulling out of junctions from a slow rolling start?
When I tried the V8 I was amazed to find that it was revving at between 1300 and 1400rpm at 70mph, with instant pick up too. Great stuff! 2011 - 2015: 3 x FL2
2015 - 2017: 2 x D4
2017 to date: FFRR SDV8
2023 to date: 2 x FL2 as “second” cars 🙄
2021 to date: Hinckley built ‘14 Triumph Trophy 1200
2022 to date: Hinckley built ‘14 Triumph Trophy 1200 & sidecar!
(One of only two known to exist in the world!)
24th Jun 2017 7:48 am
Kingmav66
Member Since: 20 Jul 2010
Location: Gloucestershire
Posts: 1349
I'm guessing that as technology moves on, that they've produced a turbo with more of a variable range, or the cc's are smaller, so hence only one fitted. I always thought that the D4 3ltr had 2 turbos that were sequential, so as to reduce the lag.
24th Jun 2017 8:02 am
Gareth Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26779
Don't forget we did a side by side drag race between a 4 and a 5, and they were remarkably similar.
D5 has less weight to shift, so can perform the same with one turbo, therefore reducing emmisions.
24th Jun 2017 8:34 am
Red Merle
Member Since: 30 Aug 2014
Location: Liskeard
Posts: 7441
Although a drag race will tell us about outright power (big turbo), it tells us nothing about bottom end flexibility (small turbo).
However, limit performance potential at the point at which emissions are tested (mostly low revs on a big diesel) and the CO2 figures are likely to be flattering. Makes a lot of sense to do it that way 2011 - 2015: 3 x FL2
2015 - 2017: 2 x D4
2017 to date: FFRR SDV8
2023 to date: 2 x FL2 as “second” cars 🙄
2021 to date: Hinckley built ‘14 Triumph Trophy 1200
2022 to date: Hinckley built ‘14 Triumph Trophy 1200 & sidecar!
(One of only two known to exist in the world!)
24th Jun 2017 10:54 am
J77
Member Since: 03 Mar 2008
Location: Fife
Posts: 6272
Red Merle wrote:
Do you notice the gearbox taking an additional down-change when pulling out of junctions from a slow rolling start?
When I tried the V8 I was amazed to find that it was revving at between 1300 and 1400rpm at 70mph, with instant pick up too. Great stuff!
On the odd occasion, sometimes she don't want to be rushed.
Though I did beat an X5 3.0D in a drag race coming off a roundabout and up the dual carriageway. It was close but I took the win, I see him looking but not looking if you know what I mean, so that was it game on. Childish but put a smile on my face.23.5MY Defender 90 X-Dynamic SE D250 MHEV Pangea Green
24th Jun 2017 4:04 pm
Grianaig
Member Since: 08 Jul 2014
Location: Tyne and Wear
Posts: 1286
2014 MY Discovery XS Indus Silver. Sadly gone. Second last LR of forty eight years continuous ownership.
24th Jun 2017 4:37 pm
Red Merle
Member Since: 30 Aug 2014
Location: Liskeard
Posts: 7441
Beating (and preferably humiliating) X5 drivers is an essential public service that we all need to offer! 2011 - 2015: 3 x FL2
2015 - 2017: 2 x D4
2017 to date: FFRR SDV8
2023 to date: 2 x FL2 as “second” cars 🙄
2021 to date: Hinckley built ‘14 Triumph Trophy 1200
2022 to date: Hinckley built ‘14 Triumph Trophy 1200 & sidecar!
(One of only two known to exist in the world!)
Last edited by Red Merle on 24th Jun 2017 5:30 pm. Edited 1 time in total
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