D4 on 35"?

[Steve223]

Hello Together,

has been a while since I was on here :-).

Just wondering whether someone on here has a D4 on 35" and what is nowadays available in regards to HD upgrades for a Discovery 4 like CV's, Drive shafts, lower control arms etc......

Contemplating another discovery build....

cheers

Stefan

[~Rich~]

Lol Steve! Isn't the new toy enough?
Not much available for the D3/4 in that regard unfortunately.

[Steve223]

Lol Steve! Isn't the new toy enough?
Not much available for the D3/4 in that regard unfortunately.

lol need to replace the tourer need more room in the back for kids and an automatic as my knees are buggered... so D4 came to mind.

still like a reasonable tyre size though, thought by now people may have stretched the envelope a bit with a D4

[shanegtr]

Lucky8 do some air suspension spacers (2.5") so you can run bigger tyres. Not too sure off the top of my head how much bigger you can go, Im sure if you spend some time on google you might come up with an answer

[Russrobe]

Gordon mentioned how he went from a D1 or 2 to the D3 and found he had barely anything break on him in comparison during competition.

275 65 18s or 285 60 18s already push the envelope really unless you want to run off road height full time with rods or llams.

My 285s rub on the chassis horn a bit. So not sure how you would go bigger.

[Russrobe]

I adjusted the castor about 5mm or half a degree and that bought it forward enough to stop rubbing...

[Stuart02]

Isn't the main reason ppl run 35s because they have live axle diff pumpkins to haul around?

[blackrangie]

Isn't the main reason ppl run 35s because they have live axle diff pumpkins to haul around?
Good point, would a D4 need 35's with its high lift independent suspension..prob not

[LRD414]

I believe the D4 clearance at Off-road height is 240mm and this is relatively uniform across the complete underbody but with the low point where the exhaust spreads to go around the spare. Not sure how that would compare to a live axle diff hung under 35s.

Scott

[fitzy]

Isn't the main reason ppl run 35s because they have live axle diff pumpkins to haul around?

Yes and no, diff clearance is probably the main benefit in muddy rutted tracks but the greater ability to roll over obstacles the larger footprint and taller sidewalls are also huge benefits.
Have a look at tuff truck and the like , even if that's not your flavour you won't do it on small tyres. Think of a skateboard mounting a kerb versus a mountain bike , overall diameter is the key

[TuffRR]

For a "touring" D4 you dont need / and can't go bigger than about 32.5".

If you need bigger than this, I would suggest you re-evaluate whether a D4 is the right vehicle for you.

[blackrangie]

Yes and no, diff clearance is probably the main benefit in muddy rutted tracks but the greater ability to roll over obstacles the larger footprint and taller sidewalls are also huge benefits.
Have a look at tuff truck and the like , even if that's not your flavour you won't do it on small tyres. Think of a skateboard mounting a kerb versus a mountain bike , overall diameter is the key
One of the most competent trucks at tuff truck is the portaled Bush Ranger and it runs 39.5's when most of the other big rigs are between running tyres between 40 and 50 inch's.

[Slunnie]

I didn't think D3/4's would go much bigger than a 32 because of the chassis Xmember being in the way.

[fitzy]

One of the most competent trucks at tuff truck is the portaled Bush Ranger and it runs 39.5's when most of the other big rigs are between running tyres between 40 and 50 inch's.
39.5 compared to 40 and some 50 inch are we splitting rabbits?

[blackrangie]

39.5 compared to 40 and some 50 inch are we splitting rabbits?
Just funny pretty much the smallest tyred truck is the most capable

[Tony V]

I have 32.3" on my D4 and get the occassional rub, the vehicle needs to have the GOE EAS or LIAMS or it will rub on lock.

[Tombie]

I have 32.3" on my D4 and get the occassional rub, the vehicle needs to have the GOE EAS or LIAMS or it will rub on lock.

AND in the event of failure will stop with the wheels touching the top of the arches. Just something to be wary of..

[LRD414]

I have 32.3" on my D4 and get the occassional rub, the vehicle needs to have the GOE EAS or LIAMS or it will rub on lock.

What's your wheel/tyre size?

[~Rich~]

My guess is 285/65 R18, not legal in NSW though (827.7mm OA) . 275/65 R18 manages to fit in the laws (814.7mm OA).

The 285 is 7.8% larger than the standard tyre while the 275 is 6.33% which gets under the 7% rule in NSW.

[LRD414]

My guess is 285/65 R18, not legal in NSW though (827.7mm OA) . 275/65 R18 manages to fit in the laws (814.7mm OA).

The 285 is 7.8% larger than the standard tyre while the 275 is 6.33% which gets under the 7% rule in NSW.

My thoughts too Rich but that's bigger than the stated 32.3" which had me wondering.

Scott

[ScottyD]

I have 32.3" on my D4 and get the occassional rub, the vehicle needs to have the GOE EAS or LIAMS or it will rub on lock.

Echoing others... what size in metric?


And - are these your daily driver tyres? If so, how do you find them? I'm tempted to go to 275/65r18 for my next set of daily drive + trip tyres (currently at 265/65r18 and loving it).

[Tony V]

Sorry guys been away,

Wheel size is 20" and the tyres are Nitto Terrain Grapplers AT's 275/55R20 tyre sizer suggest 31.9" - meassured size off vehicle 32.3"

The reason that I use a tyre size chart and a measured size is simple, 275/55/20 is a carcass size. A Mud tyre will always be taller than an All Terrain Tyre (13.5mm) and both taller than a Highway tyre due to the amount of tread depth.

The tyre size comparrison shows the tyre is 6.3% taller than what was on the vehicle with 19s.


121191121192121193

[Tony V]

Echoing others... what size in metric?


And - are these your daily driver tyres? If so, how do you find them? I'm tempted to go to 275/65r18 for my next set of daily drive + trip tyres (currently at 265/65r18 and loving it).

Metric is a smidge over 820mm when off the car, I run them at 38psi and that gives me a fantastic foot print for dirt, mud, gravel, rock and (river) sand. (I live in FNQ).

The speedo is spot on to my GPS which is great. The fuel consumption on the computer has gone up from 8.3 ltrs per 100 to 9.5 ltrs per 100 on a run. but on GPS miles its the same on a run.
Around town it gets up to 10.2 ltrs per 100 a little more than before, thats stop start turning a bigger wheel.

Yes I use these tyres daily. No issues in driving, ride or anything done just under 30,000kms so far. Where it really shines is off road, the GOE gives you an extra 2" in body/ride height, but the tyre grip is fantastic, the extra side wall is a bonus.

[Geedublya]

What offset are your wheels?

[Tony V]

What offset are your wheels?
I think that they are 45, might be 40 but 45 rings a bell, Will look for the specs.


Found it.. 45 offset. When i checked the full spec these had a higher load rating than the standard 19" wheel.
They give me a wider range of tyres to use as well.
121207

[carlschmid2002]

Metric is a smidge over 820mm when off the car, I run them at 38psi and that gives me a fantastic foot print for dirt, mud, gravel, rock and (river) sand. (I live in FNQ).

The speedo is spot on to my GPS which is great. The fuel consumption on the computer has gone up from 8.3 ltrs per 100 to 9.5 ltrs per 100 on a run. but on GPS miles its the same on a run.
Around town it gets up to 10.2 ltrs per 100 a little more than before, thats stop start turning a bigger wheel.

Yes I use these tyres daily. No issues in driving, ride or anything done just under 30,000kms so far. Where it really shines is off road, the GOE gives you an extra 2" in body/ride height, but the tyre grip is fantastic, the extra side wall is a bonus.

I have given up on ever getting my 18" rims from GOE so I will be pricing the 275/55/20 Nittos this weekend.

[LRDisco_Fever]

https://www.aulro.com/afvb/images/imported/2017/04/959.jpg

34" is possible....
If your keen.

[Geedublya]

Just a word of warning...

It is possible to run these larger sizes using LLAMS, IID tool, Rods or some other means to lift the body away from the tyres. However if you have some sort of problem which causes the suspension to drop to the bump stops the tyres will be touching either the chassis (D4 front especially) or the inner guards (body seams on a car with rear air) and you may not be able to proceed without fixing the problem or using something to isolate individual air struts and pump them up.

If you are moving along at 100km/h and your suspension lowers you don't have a lot of time to pull over before things rub. Driving on the bump stops is pretty uncomfortable but it least with smaller tyres you are driving.

This is not to say you shouldn't do it. Just be aware of the risk, having had both my previous D3 (a dodgy height sensor) and my current D4 (my fault) lower at inconvenient times in the past I decided it wasn't a risk I wanted to take.

[LRDisco_Fever]

Agree.... I say it again and add a little fruit.
"If your keen"
On cutting
Grinding
Breaking Aus law
Running bump stop extension kit (lucky8)
Lifting via Rods or IId

Etc etc etc ... Hahaha.

The pic above it a guy I know in the states.

[Russrobe]

285 60 18 is largest size you can still drive on the bump stops. There's no way you could fit larger without causing damage. I've tested it and could still drive without taking sharp turns (would damage guards).

[LRDisco_Fever]

285 60 18 is largest size you can still drive on the bump stops.


Without doing any mods.... Eg. Bump stop extension. (Not ADR approved though)

[Russrobe]

Yes no mods

Will do another test and take photo. Problem is somewhere along the line the bump stop height seems to have changed.

Mine would appear to have the larger ones even though it's a 2010 and other's have thought it was a 2012 onwards change.

Extra low setting on llams causing bump stop hit and automatic height raise is a good indication you have the larger ones.

[Redback]

I can understand 35s on a play/serious offroader, but on a touring vehicle, sorry I don't get it, imagin getting on the sat phone, yeah g'day, D4 owner.....is that dopey tyres in Tom Price,

tyre place..........yes mate,

D4 owner.....I'm after a 35/11/18 BFG for me D4,

tyre place....hahahahahahahahahahahahahahahahaha

[Russrobe]

Do you expect any different a reply from a 265 60 18, 285 60 18 or 275 65 18? I wouldn't.

[DiscoJeffster]

I can understand 35s on a play/serious offroader, but on a touring vehicle, sorry I don't get it, imagin getting on the sat phone, yeah g'day, D4 owner.....is that dopey tyres in Tom Price,

tyre place..........yes mate,

D4 owner.....I'm after a 35/11/18 BFG for me D4,

tyre place....hahahahahahahahahahahahahahahahaha

And yet, like they did for me up north, they trucked me up the tyre size I needed. They'd have air freighted if desired overnight, for a reasonable $100 more. Now I do get your point, but if you do a tyre, you can plan/ring ahead to have one there for when you arrive at the next convenient tyre stop. I had the same issue with the rubbish 255/55/19, hence one reason why people go down to 18s amongst many others.

[shanegtr]

...is that dopey tyres in Tom Price,



Might be very close to the mark with that comment[wink11]

[Redback]

I will imagine even 17s will be rare up there, which is what we'll be touring on, 245/70/17 Bridgestones and I think we'll need one trucked in if we destroy one, so serious[bigsad]

My point was, 35s are overkill on a touring vehicle regardless of make.

[shanegtr]

Standard landcruiser and prado sizes are not too bad, which is one of the reasons I run 265/65/17.

[BobD]

I got a 285/60 R18 off the shelf in Darwin so that is also a reasonable size as I think some people use them on 200 series. Only problem, it was a Dunlop but still AT and similar tread to D697, just not LT.

[Russrobe]

I got a 285/60 R18 off the shelf in Darwin so that is also a reasonable size as I think some people use them on 200 series. Only problem, it was a Dunlop but still AT and similar tread to D697, just not LT.
Yeah Bob my old mans 200 series came standard with 285 60 18s. I stole one of his old ones as a 2nd spare =)

[jonesy63]

I will imagine even 17s will be rare up there, which is what we'll be touring on, 245/70/17 Bridgestones and I think we'll need one trucked in if we destroy one, so serious[bigsad]

Hey Baz - that is a popular size for Hillux - so don't worry! ;)
Cheers,
Rob

[Tony V]

Just a word of warning...

It is possible to run these larger sizes using LLAMS, IID tool, Rods or some other means to lift the body away from the tyres. However if you have some sort of problem which causes the suspension to drop to the bump stops the tyres will be touching either the chassis (D4 front especially) or the inner guards (body seams on a car with rear air) and you may not be able to proceed without fixing the problem or using something to isolate individual air struts and pump them up.

If you are moving along at 100km/h and your suspension lowers you don't have a lot of time to pull over before things rub. Driving on the bump stops is pretty uncomfortable but it least with smaller tyres you are driving.

This is not to say you shouldn't do it. Just be aware of the risk, having had both my previous D3 (a dodgy height sensor) and my current D4 (my fault) lower at inconvenient times in the past I decided it wasn't a risk I wanted to take.

While I agree that 35s could cause some major issues

In my case, I ran my 275/55R20 around town without any lift for 2 weeks with only minor rubbing on full lock.
I raised it when I arranged for a full wheel alignment.

121541 So an overall height diffrence of 1.9 inches and 0.8 inces in width or effectively 0.95 inch above the tyre under the wheel arch and when turning, with 0.4 inch inside the wheel arch and 0.4 inch towards the outside. If the suspension goes, it a flat bead back to the shop with or without this difference.

[~Rich~]

Well it could be done, look at this current RRS on 37" tyres!

https://www.aulro.com/afvb/images/imported/2017/04/764.jpg

Article: 37's on a Range Rover Sport - Expedition Portal (http://forum.expeditionportal.com/threads/169476-37-s-on-a-Range-Rover-Sport)

[Slunnie]

Well it could be done, look at this current RRS on 37" tyres!

Article: 37's on a Range Rover Sport - Expedition Portal (http://forum.expeditionportal.com/threads/169476-37-s-on-a-Range-Rover-Sport)

I do love that! Just reading a previous thread on it, they basically lowered the front and rear suspension assembly by 6".

[~Rich~]

Getting that passed by an engineer would be a challenge I'm sure, let alone pay for insurance for it.

[Slunnie]

It'd be an interesting exercise. From what I can see it is a suspension lowering job (Like the Les Richmond Disco2 4" kit) rather than a body lift. Speedo correction. Those tyres would need to be covered though.

That winch is in a strange place.

[blackrangie]

It'd be an interesting exercise. From what I can see it is a suspension lowering job (Like the Les Richmond Disco2 4" kit) rather than a body lift. Speedo correction. Those tyres would need to be covered though.

That winch is in a strange place.
Correct, it lowers everything by 6 inches front and rear, they guy that built the lift(drop) has been doing the same to hummers for years.. Awesome end result, just goes to show you anything is possible

[Slunnie]

Correct, it lowers everything by 6 inches front and rear, they guy that built the lift(drop) has been doing the same to hummers for years.. Awesome end result, just goes to show you anything is possible

Does the entire D3/D4/RRS suspension mount entirely on sub-frames for the front and rear? Is the top of the struts also to the sub frame or does that go to the body?

[shanegtr]

Does the entire D3/D4/RRS suspension mount entirely on sub-frames for the front and rear? Is the top of the struts also to the sub frame or does that go to the body?
The D3 and 4 all the suspension arms are mounted to the chassis.
As well as the airbags, theres no sub frame so to speak. Would be doable with the new D5 I would think