KUN26 Variations

[Yowie]

Hello everyone,

Just wondering if anyone knows the difference between the first batch of hilux's and the second batch (mid 08 to facelift) as the second lot have a higher GCM but GVM and kerb weight appear the same from the information I've been able to find.

Reason I'm asking as I have an 06 model and its GCM is 4600kg and would like to see about getting it upgraded to 5030kg like the second batch.

Any information is appreciated

[hylux]

The bigger brakes released 2010-2011 will be your biggest issue

[Yowie]

The bigger brakes released 2010-2011 will be your biggest issue

Yeah but the initial GCM increase from toyota took place in mid 2008. I've contacted toyota to see what they have to say and see if it can be restickered by the manufacturer.

[HK1837]

The GCM went up again with 2012 models when the towing capacity went up from 2250kg to 2500kg. I doubt you’ll get a GCM increase.

[Yowie]

The GCM went up again with 2012 models when the towing capacity went up from 2250kg to 2500kg. I doubt you’ll get a GCM increase.

Ah ok, I'm only after the 430kg increase as it means I'm not having to compromise on either my tow capacity or my load carry capacity. I have reached out to Toyota in Brisbane and they are going to check the toyota manuals to see what the difference is and may be able to write a letter saying I meet the compliance of the 08 for upgrade. Wait and see

[Gravy72]

The GCM went up again with 2012 models when the towing capacity went up from 2250kg to 2500kg. I doubt you’ll get a GCM increase.

Ah ok, I'm only after the 430kg increase as it means I'm not having to compromise on either my tow capacity or my load carry capacity. I have reached out to Toyota in Brisbane and they are going to check the toyota manuals to see what the difference is and may be able to write a letter saying I meet the compliance of the 08 for upgrade. Wait and see

Did you ever obtain a response from Toyota?

[martynvella]

Sort of pointless really.
Pretty sure once a new vehicle has been registered in Australia the GCM can not be changed.

[Sparksy]

Brakes were changed in some models, (there are two disc sizes and three different pad sizes go figure)
Clutch was bigger in 08 - 260mm flywheel to a 275mm flywheel with clutch to suit
It got a power hike as well around 08 i think
Tow rating was increased to 2500 from 2250 i think
ADD unit went in on SR5's i believe
Pistons in euro 3 (05 to late 06) were the 040 ones with a stronger fibrous material across the crown that is notably absent in the euro 4, the hilux in Aust got 080 pistons until end of production
When it went to a euro 4 in late 06 it changed from copper injector seats to an alloy that was later DLC coated
Injectors went from nothing to fully DLC coated at various points over the years.

Thats about it mechanical wise.

[hiluxxury]

Rear wheel bearings were also changed at some point.

So too was the ECU software, I think in Sept 2009... could have been at the time of the DLC but definitely before the piezo's were introduced - this made diagnostics much harder.

It would be good to summarise this somewhere. If I had time, I'd make a start of the main changes. There have been many minor upgrades along the way (the r151f gearbox is a good example) that dont get a lot of discussion.

I agree with the euro3 pistons being stronger. I haven't heard of a euro3 cracking a piston... yet. The power increase when the euro4 arrived was 6kw and 0nm fwiw.

[Gipsy]

So to summarise; there are many changes over the years and to spend money on a gcm increase would be throwing good money out for bad.... Better to upgrade the vehicle to a later model which is designed to do what the op is asking of a 15+ year old design. That's of course if it's even possible to increase gcm to that level no matter what $$$$s you throw at it!
Besides, gcm on most vehicles is an illusion (delusional) because it's an arbitrary figure used by manufacturers to compete with each other! Most vehicle owners see the gcm and think 'that's great... I can load up the ute to its gcm and all is good'. Not so, if you actually read the fine print as to what's included in the figure... Often it doesn't even include a full tank of fuel, let alone the wife and kids and the family dog(s). It terrifies me to see a late-model ute rated at 3.5tonne towing capacity trundling down the road with a 3.5tonne caravan on the back and the tub loaded up with canopy, tinnie on the roof and the family of 5 +dog(s) loaded in the cab. It is not possible the vehicle is under the gcm!

Rant over

[hiluxxury]

Agreed... the last of the n70 are the ones to get.

[Gipsy]

Yes I vote the last n70 too. All the bugs fixed and no BS about gcm!

[Sparksy]

I agree with the euro3 pistons being stronger. I haven't heard of a euro3 cracking a piston... yet. The power increase when the euro4 arrived was 6kw and 0nm fwiw.

I have heard of one or two of the 040's blowing which surprised me, but when I asked about the operating conditions at the time of it going they were right up there with the worst possible combination of factors lol. 40 deg day, towing 3.5t up a hill, foot to the floor, 33" tyres, stock gearing, let the revs drop to 1.8k... bang! So they can crack, but apparently under a lot more punishment than the 080's.

[hiluxxury]

I'm not surprised.

[Gipsy]

So from that, it looks like one should keep the revs up and don't overload.... I've been saying that since joining newhilux. No wonder there are cracked pistons, it seems they didn't improve the euro4 pistons (maybe until 2015, the last 1kd) but the inevitable outcome of overloading the Hilux at low revs is becoming more obvious

[hiluxxury]

There is sometimes more to the story as well - such as incorrect combustion. This is due to wear, contamination, chips/tunes and other engine modifications etc.

[Gipsy]

Agreed, but loading up a diesel at low revs will kill any diesel, or petrol for that matter. The energy from the combustion must go somewhere and the piston takes all the stress, especially heat. Any engine needs dynamic motion or else combustion is just a big explosion with nowhere to go. You would know the term 'detonation' which happens in all engines, particularly at low revs. Even the modern electronic ECU can't handle that. That's why engines need revs and not overfuelling.
Even a drag engine will blow the head off if there's too much bang and not enough rotation, they just have stronger pistons and bottom end components. All that energy has to go somewhere, normally the weakest point.

[hiluxxury]

I agree with you on that Gipsy. With stock gearing and 33in tyres, I never used 5th gear - there was never any need to anyway.

[Gipsy]

It would be interesting to find the numbers of Hilux that suffered cracked pistons.... Different year models, Automatic and manual, big tyres and heavy loads etc. Is there anywhere this information is collated? My bet is lots of manuals with lots of modified drivetrains and operating at the limits (or beyond) of normal operation. And mostly with Euro 4 specifications.
I can't imagine Toyota would publish anything like this, but at least a straw-poll would offer some data. I'm sure Toyota would have some idea of why engines failed, since they did produce updated engine specifications particularly pistons. Maybe the mods have information contained in various threads on cracked pistons and engine failures.

[hiluxxury]

I'd say that like the dpf in the n80, clutch issues in the n70 and all of the other issues we hear about on this forum and other outlets, the percentage of cracked piston is very small.

How many 1kds are out there?