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Home > General > TD4 or SD4 |
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richardandjo2010 Member Since: 22 Jan 2021 Location: essex Posts: 39 |
This is my first post on here, i have been looking to buy a FL2 it has to be an auto. I have been reading posts on here and trying to learn a little about them. i know the SD4 is a bit more powerful than the TD4 but which is the most reliable or are they both about the same. I will be using it to tow a caravan and general running about i expect to cover around 8000 miles per year, any advise on best choice would be appreciated
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23rd Jan 2021 10:52 pm |
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 3107 |
I agree with above.
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23rd Jan 2021 11:29 pm |
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jules Member Since: 13 Dec 2007 Location: The Wilds of Warwickshire Posts: 4947 |
Ive had several manual TD4s and currently have a SD4. The SD4 is the better of the two; more grunt & nice auto.
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24th Jan 2021 12:47 am |
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GundogSD4 Member Since: 04 Dec 2019 Location: Wiltshire Posts: 478 |
Both SD4 & TD4 have 420Nm of torque, it's the BHP that differs 190/150. |
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24th Jan 2021 8:03 am |
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jules Member Since: 13 Dec 2007 Location: The Wilds of Warwickshire Posts: 4947 |
So if they both have the same max torque and as BHP and torque are related (BHP = Torque X RPM / 5252) then to achieve a higher max BHP with the same max torque the SD4 must be able to maintain a higher torque at the upper rpm range as it doesn't rev any higher than the TD4. So the grunt must be available over a wider RPM range.
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24th Jan 2021 1:35 pm |
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jules Member Since: 13 Dec 2007 Location: The Wilds of Warwickshire Posts: 4947 |
Found them . You can see the difference in the torque curves.
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24th Jan 2021 1:48 pm |
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jules Member Since: 13 Dec 2007 Location: The Wilds of Warwickshire Posts: 4947 |
Interesting it was always considered that diesels had "flat" low end torque curves compared to "peaky" petrol engines but modern turbo petrol engines are quite amazing.
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24th Jan 2021 2:05 pm |
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Bobupndown Member Since: 26 Dec 2014 Location: Upside down behind the TV! Posts: 2790 |
I tow this with an Sd4
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24th Jan 2021 3:06 pm |
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richardandjo2010 Member Since: 22 Jan 2021 Location: essex Posts: 39 |
Thankyou to all who responded, i think it will have to be SD4 for me then.
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24th Jan 2021 3:23 pm |
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Bobupndown Member Since: 26 Dec 2014 Location: Upside down behind the TV! Posts: 2790 |
I've never found our twin axle to be anything but stable. Ours has atc which presumably helps stability. Its a big old lump to manoeuvre when un hitched though. We have a set of motor movers on the front axle and would struggle to get it onto pitches that have tight access without them. The extra space inside is a bonus. Landrover - turning owners into mechanics since 1948
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24th Jan 2021 5:25 pm |
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 3107 |
Very interesting.
FL2 XS SD4 Auto 2010 2012-2017 (21k - 91k miles) (MY2011) FL2 Metropolis SD4 Auto 2014 2017- (16k - 77k+ miles) (MY2015) Metro in its 11th Year of (Extended) LR Warranty / Full LR Service History (Expensive, but Trouble/Worry free - hopefully?) |
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24th Jan 2021 6:08 pm |
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Nodge68 Member Since: 15 Jul 2020 Location: Newquay Posts: 2071 |
As above. The power output from the TD4 is clearly being limited by the mapping. This gives a very wide and flat power curve, clipped at 150 PS. The SD4 hasn't been mapped to limit torque early, so gives a steady increase in power, before it peeks, then trails off again. Interesting plots those. Hyundai Ioniq 5 Ultimate. The family car. 2009 Rimini Red SE TD4. Gone. 2006 Tonga Green i6 HSE. Gone. Audi A5 convertible, my daily driver. 1972 Hillman Avenger GT, the project. |
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25th Jan 2021 12:49 pm |
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jules Member Since: 13 Dec 2007 Location: The Wilds of Warwickshire Posts: 4947 |
I found them with a google search on
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25th Jan 2021 4:31 pm |
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Simon J Member Since: 27 Jul 2019 Location: Norn Iron Posts: 703 |
That is some rig, Bob. I’m not a caravan person myself but that is very impressive. |
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25th Jan 2021 5:56 pm |
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