NEW D-MAX /MUX /COLORADO FORUM

NEW D-MAX /MUX /COLORADO FORUM
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PostPosted: Tue Apr 03, 2018 4:50 pm 
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Joined: Tue Apr 03, 2018 4:14 pm
Posts: 3
Hi all,

I get my LS-U delivered in May and I'm arranging my modifications and accessories at the moment, just wondering if anyone has done a Pedders GVM upgrade to 3200kg, as the below list of gear going onto the car will not leave much for carrying capacity. I'm not intending to tow a lot as I'll also put a roof top tent on at some stage, will have to stick to the swag for a while yet.

If you've got any other modifications or accessories not in the list you've found useful in your rigs please let me know.

Cheers

MCC Bullbar
MCC Sidestep with rails
MCC Rear bar with carriers
112L Fuel tank
Snorkel
1/2 Cargo Barrier
Winch
Roof Rack
Dual Bat / Electric items
Draw system
18x8 inch rims
LT265/65R18 Tyres
50inch Light Bar


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PostPosted: Tue Apr 03, 2018 5:43 pm 
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Joined: Sat Oct 12, 2013 5:36 pm
Posts: 1392
Have you actually tallied up all that weight you are adding to an Mux?

A drawER system and carriers on the rear will almost max out the rear suspension if carrying anything.
A roof top tent on top of that is a big ask too.
I would be checking the rear axle loading ability before asking for advice on further items to weigh it down.

18” rims only mean less load ability and less shock absorption and less ability to handle rough tracks.
16” are far better off road anyway and a better range of tyres available and much less cost.
You will get all the light you will ever need with a far smaller light bar. 50” will look out of place and use much more power and require bigger cables.


Last edited by mydmax on Wed Apr 04, 2018 10:52 am, edited 1 time in total.

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PostPosted: Wed Apr 04, 2018 10:32 am 
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Joined: Sat Oct 19, 2013 10:23 pm
Posts: 3191
Location: Darwin... sort of.
All that gear fitted to a Dmax will give you a weight of around 2.7- 2.8 Tonnes (it's very similar to what was fitted to my own DMax) and a DMax has a GVM of 2.95T!! but the problem is worse for you because the MUX is around 100kg kerb weight heavier to start with and you have a GVM of only 2.75T!!, this problem is well documented on this forum and I would say that even with the GVM upgrade you would still be in trouble.

The bullbar and winch alone will be just short of 100kgs for example...

Read through this thread viewtopic.php?f=19&t=1799 it pretty well sums it up, the answer is page 2 I think.

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PostPosted: Wed Apr 04, 2018 11:12 am 
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Joined: Sat Oct 12, 2013 5:36 pm
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Just rereading what you said about Pedders increase in GVM.
You said 3200KG
Danno has stated the max is 2750 Kg

That indicates Pedders are somehow claiming 450KG increase. That is a huge amount on that sized vehicle. Have you checked the legality of or even the truth of it? Please don't automatically believe Pedders.

On other dual cabs the increase is nowhere near that amount after a GVN upgrade. Ah, but it is Pedders you are dealing with.

The rear axle load stated by Isuzu is 1600 KG. Half of 2750KG is 1375KG if evenly distributed, which means a max of 225 approx weight carrying ability in std trim for the rear axle. Since any weight added to the luggage area or fuel or anything else it would seem the Pedders claim is well overstated and just cannot be.
With too many accessories you can't have people inside, simply too heavy.
A driverless vehicle is lighter, no allowance for passengers either.
How do Pedders increase the carrying capacity of the rear axle, is what I would want to know.
Do they fit a much larger/heavier rear axle?


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PostPosted: Wed Apr 04, 2018 6:03 pm 
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Joined: Sat Apr 29, 2017 7:58 pm
Posts: 221
Location: Brisbane
Well congrats on your new purchase.
Maybe ask pedders to get some customers that have had it done to call you for a rundown. If a customer is happy with a product they are normally pretty happy to tell you about it. I have seen some pretty tricked up muxs on the islands. Good luck with the info gathering.


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PostPosted: Wed Apr 04, 2018 6:24 pm 
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Joined: Sat Oct 12, 2013 7:25 pm
Posts: 686
Location: Baldivis WA
Sounds a lot like my D-Max as well. When I did the calculations including the van ball weight I was going to be 20kg over the allowable payload so I had the ARB GVM upgrade included in the deal - an additional 270kg payload.

All well and good having all these goodies but you need to to look at your van (if you are going to tow one). Even though my D-Max is rated to tow 3500kg I can not legally do it. Out van weighs 2500kg and the D-Max is 3000kg when both a fully loaded for touring, I have around 500kg spare but if I had the MUX I would be maxed out.

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PostPosted: Thu Apr 05, 2018 7:21 pm 
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Joined: Tue Apr 03, 2018 4:14 pm
Posts: 3
Thanks for all the replies.

The Pedders GVM upgrade to 3200kg is ADR approved, no engineer signoff when added before registration, don't know how they get around the axle weight but they have. Bump stops are changed, along with kelvar/ceramic pads. Other companies are claiming they can do it with tough dog gear and engineering signoff.

I'll certainly be putting it on the scales when I get it. I'll ask the guys fitting out the MU-X to put it on the scales before loading it up and after. I was always 200kg over the original GVM of my 2009 Dmax (2900kg) (complete ARB fitted out, bullbar with winch/sidesteps with rails/ rear bar/ steel long range tank/ canopy, tradesman roof rack/ 2nd battery/ steel rims / draw system and 50L water tank). Hence why this time I'm ticking the box to cover my arse legally. I'm not towing a van or trailer when I head out and I remove the rear seats as I only travel with one passenger (I've got no kids to worry about).

I know that 16x8inch with 265/75R16 are much better for dispersing shock on the vehicle, but I've been informed that there are possible changes in the wind that you wont be allowed to reduce the rim size from what is placarded. So I'm getting ahead of this just in case. I'll be running S/T Maxx tyres for good strength/tyre life and I don't push higher speeds on the dirt roads anyway, not looking to go crawling up rock walls. Fingers crossed no chassis issues.


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PostPosted: Fri Apr 06, 2018 10:46 am 
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Joined: Sat Oct 19, 2013 10:23 pm
Posts: 3191
Location: Darwin... sort of.
2018MUX wrote:
Thanks for all the replies.

The Pedders GVM upgrade to 3200kg is ADR approved, no engineer signoff when added before registration, don't know how they get around the axle weight but they have.


I'll tell you how they get around the axle weight problem....they haven't...that's your problem to deal with should you get caught. Ask the question of Pedders or ARB or whoever and see for yourself if you can get an honest answer, they are only certifying the chassis, suspension and brakes as being capable of handling the extra stress. You really should have a rethink now on the gear you're proposing to fit because in lots of cases there is better, lighter quality available and now would be the best time before you shell out money.

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PostPosted: Fri Apr 06, 2018 12:12 pm 
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The main problem is, YOU are believing what Pedders tell you.
Since Isuzu state the rear axle rating, other manufacturers do also, there is now way the GVM can be increased past the axle rating.
So, as Danny said, they haven't got around it as they claim.

Any test by road authority or Police will quickly reveal you WILL BE above the axle rating. They aren't silly, and they can have a promo pamphlet from Isuzu in their hand when they rear their scales. Sort of shoots pedders in both feet I reckon.
Depending on what else they claim, the next bullets would be inserted higher up.

The use of Kevlar/Ceramic pads sounds romantic, but the wear rate on the discs will see you at the Brake specialist more times than you drive it, 'cos they will chew the discs away. They may brake better at higher temps trying to retard the overweight aspect but the discs will disappear at a proportional rate.

You seem easily impressed with easy talk which don't have solid facts behind it.

It looks like they have conned someone in the ADR system if the rego people say you can overload the axle by that amount, because they ping truckies on a regular basis for doing exactly that.
The roll over test trips at check stations red the axle weight instantly, they do/did on the coaches I drove for a while. If over you didn't resume your travel.

Bump stops probably changed to try and save things from destruction and so try and absorb the much higher mass as it inevitably crashes down onto the axle . The drivers of such vehicles aren't going to modify their driving behaviour and get a whole lot smarter than before the GVM work, are they?
It isn't a fact of a bit of overload, any gross increase increases sudden loads from dips and bumps to much higher G forces than would be normally experienced.
Some Trucks have G for readers in their cab and it tells the driver "that bump", (example reported on Wed night ABC program) to be 2.5 times the actual normal weight on the front axle of the truck.
So, if you hit a large bump with additional weight now called normal by Pedders, can the rear axle or chassis, take 2.5 or more sudden impact force than it's designed/stated maximum. That force is made even worse if towing or rear carriers are involved because of the leverage factor of the weight acting on the rear of the vehicle.
Most Pedders staff will have no concept of such things ever happening.


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