What Tyres pressure should I be running with MT tyres?

Short fat bloke · Feb 2, 2010

Good Afternoon All!

Ive recently fitted sum Insa Turbo Dakar Mud terrian tyres (Std size 235 70 16) to my 300tdi Disco and was wondering what tyres pressures to run due to them A) being a MT and not road bias and B) being a retread.?

at the moment Im running 32psi in the rear and 26psi in the front.

Part of the reason for asking the question is that Im noticing quite a differnce in fuel consumption, I used to get around 25-26mpg's doing my usual short journeys of 3-5miles to work and back and a few other little trips in and out of town but Im now getting 18-20mpgs, this is as far as Im conerned V8 teritory, and if Im shoveling this much juice I'd rather be driving a V8!

Has anyone else experienced any thing like this?

SFB

classic kev · Feb 2, 2010

Your tyre pressures seem a bit out but i don't know what they are supposed to be for normal tyres and normal loads. I have the same tyres on my RRC, I run at 30psi all round.

Fuel consumption - well I run a V8 so don't lose sleep over it but you will use a bit more fuel on mud tyres but I wouldn't have thought it would be that much of a difference. If you're getting 18 - 20 mpg around town and short hops be happy! A v8 will struggle to see better than 14mpg with the average being more in the range of 9 -12mpg. On motorways a v8 might do 23-24mpg when being reasonably gentle.

Short fat bloke · Feb 2, 2010

Cheers Kev, I guess Im wondering if the consumption is down to tyres or something more serious?

Paul D · Feb 2, 2010

I wouldn't have thought tyres would make that much difference to fuel consumption. When we off-road I generally drop my tyre pressures (AT's, not MT's) to about 20 psi all round for grip .. doesn't seem to make much difference at all!

What might make a difference, indeed did on mine, but again not that much, is the diameters of the tyres .. but you say these are the same size so it shouldn't be that!

Might be worth looking elsewhere for a coincidental problem occurring.

Mark Disco · Feb 4, 2010

i noticed when i went to my Insa Turbo's that fuel economy dropped massively. was getting 300+ miles to a full tank of mostly town driving before the new tyres, now im down to 200 miles. nothing else changed on the car so i just put it down to the tyres and the compromise we have to make

brainboy81 · Feb 4, 2010

Mt's will kill mpg just the nature of the tyre it's not designed for road use. Unless you slend a lot of time off road I'd go for at's

SHORT ROUND · Feb 4, 2010

i'm running insa turbo MT all round now and i hav'nt noticed any difference in fuel consumption since changing from my road tyres and my tyre pressure's are about 33 psi all round

YORKIE_GAV · Feb 4, 2010

SHORT ROUND said:
i'm running insa turbo MT all round now and i hav'nt noticed any difference in fuel consumption since changing from my road tyres and my tyre pressure's are about 33 psi all round

Thats what i want to here cause i'm fitting some kumho muds soon. Was that standard size or did you go bigger?

bobbler · Feb 4, 2010

SHORT ROUND said:
i'm running insa turbo MT all round now and i hav'nt noticed any difference in fuel consumption since changing from my road tyres and my tyre pressure's are about 33 psi all round

Thank fook for that I was starting to consider leaving the Saharas in the garage for a while longer

barmatt · Feb 4, 2010

SHORT ROUND said:
i'm running insa turbo MT all round now and i hav'nt noticed any difference in fuel consumption since changing from my road tyres and my tyre pressure's are about 33 psi all round

I agree, I've been running insa turbo dakars for a few months and I've only noticed a slight drop in fuel economy and run about 33 psi all round too. I wasn't sure about buying remoulds at first but finances said I had too and I'm glad I did, brilliant tyres off road and not half as bad in the wet as I expected.

ratty · Feb 4, 2010

I'm down by about 4mpg running my special tracks. I get about 23mpg.

fanatic · Feb 4, 2010

Mine on special tracks is like driving a series on motorway, 4 gear as it now goes slower in 5th 65mph or so. time for a set of spare road tyres and more power

barmatt · Feb 4, 2010

fanatic said:
Mine on special tracks is like driving a series on motorway, 4 gear as it now goes slower in 5th 65mph or so. time for a set of spare road tyres and more power

Good idea, I got a set of lr steelies in the garage with road tyres on for when the weather improves

Just keep looking on fleabay some wheels and tyres go for feck all, I paid £14 for 4 land rover steelies and nuts

.

SHORT ROUND · Feb 4, 2010

i'm on 205/80/16 at the moment but i will be going bigger in the future but they came up at £140 for wheels and tyres with nearly new tread so i had them.

fanatic · Feb 4, 2010

something like 205 road tyres go for peanuts, Locally and A roads the defender v8 csw is great, but unless I change the engine-it's crap on 31.5 inch wheels on motorway.

Considering I have Defender transfer box which is lower ratio than disco-disco transfer box would be hideous over geared

300tdistu · Feb 5, 2010

barmatt said:
I agree, I've been running insa turbo dakars for a few months and I've only noticed a slight drop in fuel economy and run about 33 psi all round too. I wasn't sure about buying remoulds at first but finances said I had too and I'm glad I did, brilliant tyres off road and not half as bad in the wet as I expected.

yes me too insa turbo dakars 265 75 16, got 4 for £175

What Tyres pressure should I be running with MT tyres?

Short fat bloke

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classic kev

Well-Known Member

Short fat bloke

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Paul D

Old, nackered 'n broke, but the Landy is fine . :)

Mark Disco

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brainboy81

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SHORT ROUND

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YORKIE_GAV

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bobbler

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barmatt

Well-Known Member

ratty

I'm not special I'm limited edition

fanatic

RESPECT IS EARNED, BEATINGS ARE FREE ;-)

barmatt

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SHORT ROUND

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fanatic

RESPECT IS EARNED, BEATINGS ARE FREE ;-)

300tdistu

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