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Iva and towing limits

  • Lambert
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08 Jun 2017 18:14 #181868 by Lambert
Replied by Lambert on topic Iva and towing limits
Thanks all. I will look into this more and share my findings.

Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
Bellerophon (2024 grello van daily
ADOS Attention Deficit Ooooh Shiny!

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09 Jun 2017 12:16 #181880 by Busta
Replied by Busta on topic Iva and towing limits

Rhinoman wrote:

Busta wrote: hence the Defender with it's transmission break and permanent 4x4 was able to hold 3.5 tons and out perform part-time 4x4s with handbrakes operating only on the rear wheels.


How can that be the case unless the axles are permanently locked? you would still only have an effective handbrake on two wheels, in Germany the SJ with transmission brake had to have a handbrake actuated locker fitted, in order to improve the handbrake. I suspect its more to do with the size of the brakes, the Defenders weight, wheelbase and the amount of torque that it has.
I don't think that its possible to change the towing weight, if you were to submit it for an IVA how would you prove that it would be safe to tow a larger weight? stability will be an issue with a bigger trailer.


I see what you are saying. It doesn't make much sense but it is what I have been told. In terms of weight, wheelbase and torque, many vehicles that exceed the Defender in all of these respects have lower towing limits, so it's not determined by those factors.

It may well be that manufacturers decide a figure they think represents a good compromise, regardless of the actual abilities of the vehicle.

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09 Jun 2017 12:26 - 09 Jun 2017 12:27 #181881 by Busta
Replied by Busta on topic Iva and towing limits

mlines wrote: The braking explanation also doesn't really explain how fitting a tachograph to some vehicles increases their towing capacity (LWB Defender)

Only if towing for hire or reward, where a tachograph is required if the MAM exceeds 3.5 tons. For personal use you do not need a tachograph and can tow 3.5 tons behind any Defender (license dependent).


mlines wrote: And also the current Range Rover Sport where the more powerful and better braked Sport SVR has a lower towing weight (3000kg) compared to the less powerful and less braked standard Sport (3500kg)



I think this points towards the limit being set by the manufacturer rather than determined by any sort of government test.
Last edit: 09 Jun 2017 12:27 by Busta.

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  • rappey
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09 Jun 2017 16:46 #181893 by rappey
Replied by rappey on topic Iva and towing limits
Since 2001 and the introduction of emission levels and paying road fund license based on them some vehicles are not allowed to tow at all !
If you want to tow 3500kg then thats really going to push up the emissions and tax level of that vehicle !
Mechanical strain on the vehicles powertrain under acceleration and braking while towing have a big part to play...
There is a vid where a jimny pulls a 82 ton road train... Its not about what it can pull, but what it can sustain without physical damage to the vehicle in extreme circumstances like steep hills, or a huge headwind.
If you want to tow a heavier weight then get a more suitable vehicle.. Same for if you want to go a lot faster ?

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  • Lambert
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10 Jun 2017 05:23 #181901 by Lambert
Replied by Lambert on topic Iva and towing limits
Right, having read the iva manual it suggests that under section 44 masses and dimensions that if a vehicle is intended to tow a braked trailer then its technical weight being the gvm is the maximum unless it is a 4x4 at which point it becomes 1.5 times the technical mass which for an otherwise standard Jimny would be something like 1900kg but it would also have to be demonstrated that the coupling was suitable under section 50 and the brakes under section 46. There is hope. I have a n opportunity to talk to an iva centre next week so the quest continues.

Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
Bellerophon (2024 grello van daily
ADOS Attention Deficit Ooooh Shiny!

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  • OllieNZ
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10 Jun 2017 05:39 #181902 by OllieNZ
Replied by OllieNZ on topic Re:RE: Iva and towing limits

11/60 wrote: Right, having read the iva manual it suggests that under section 44 masses and dimensions that if a vehicle is intended to tow a braked trailer then its technical weight being the gvm is the maximum unless it is a 4x4 at which point it becomes 1.5 times the technical mass which for an otherwise standard Jimny would be something like 1900kg but it would also have to be demonstrated that the coupling was suitable under section 50 and the brakes under section 46. There is hope. I have a n opportunity to talk to an iva centre next week so the quest continues.

A jimny can't use 4wd on the road so imo it doesn't count as a 4wd for towing. Defenders have full time 4wd. Something like a 2nd Gen>on pajero, 3rd gen hilux surf or 90 series land cruiser despite being primarily 2wd have a center diff allowing 4wd to be used on road. There will be others that fit in those categories.

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