Mistral MPG?

[kbekl]

Which for the power to wieght ratio is good i think plus they go on & on & take abuse & still go on & on :bow :thumbs

no they take certain abuse then go on and on lol

get the engine wet and it dont like it lol:lol:lol:lol

 

[Stuarty]

After reading what happend to your engine i will be investing in a snorkel before i tackle any water lol that has put me off somewhat

 

[kbekl]

After reading what happend to your engine i will be investing in a snorkel before i tackle any water lol that has put me off somewhat

if i was doing the mave again i wouldnt leave the air inlet where is was right behind the indicators i would put it up near the windscreen wiper assembly as you should get enough air come down throught the vents and you would be able to wade a fair bit deeper :thumbs:thumbs

 

[slimlfc68]

hi guys r we talkin mixed miles coz we got 435 miles on afull tank from liverpool down to tidworth and over to andover few days round town and then back home that aint bad then :thumbs

 

[lacroupade]

its dependant on the tyres normally on max with the 30 9.50 as their weight is under par comapired with the originals

take my isuzu standard it wants 28 front and 32 rear but as i have the lotus handling it wants 34 front and back

if you are running 30's or any other type of " standard tyres then it should be the max psi so i have been told

what do you mean by that bit Karl? not clear?

my assumption is that bigger tyres are able to carry more weight usually so are under less stress therefore don't need higher pressures? the extreme would be these big fat 'roller' tyres like you have on tractors etc.. - I have a set on my little Honda off-road trike and they have just 1 bar in them, i.e. atmospheric pressure.

I can see what something with non-standard suspension (which may be harder for example, or rely on the tyres as part of the system more than the standard setup might) could require a few more PSI, but I suspect if you stick bigger tyres on a standard truck, the pressure should stay the same or possible even drop a bit....I'll go and have a chat with my mate who owns a tyre shop and see....

UPDATE: a bit of googling would seem to indicate that, for example, a tyre 25% wider can handle 25% more load than the original at the same pressure, which would imply that if anything, bigger tyres want pressure decreasing not increasing...?

Interesting debate and I think we should dig deeper til we get an answer....

 

[Stuarty]

Thats a good point as at 32 psi they defo dont look flat and i have noticed no charactristics (spelling ) of under pressure tyres whilst driving and there seems to be no uneaven ware across the tyre at the moment anyway will be intresting to find out.

 

[lacroupade]

Thats a good point as at 32 psi they defo dont look flat and i have noticed no charactristics (spelling ) of under pressure tyres whilst driving and there seems to be no uneaven ware across the tyre at the moment anyway will be intresting to find out.

I'd say 32psi is a good measure - I run my 31" AT2s at around 30-32psi with no problems. As has been said, your biggest technical issue is the fact that, unlike all these people who THINK they are getting 23-25mpg, your speedo is close to accurate with those bigger tyres.

Their average speedo under-read of 10% (typical on the Terrano) means they are actually getting around 21mpg in reality because when their speedo says they've covered 110 miles they've probably only covered about 100.

But checking/cleaning filters is always good advice for starters. Fitting a 57i K&N induction kit (a piece of pi55 and costs around £50 or less) will give you at least another 2mpg and ever so slightly better performance - so washes its face in about eight tankfuls of juice.

 

[kbekl]

its is dependant on the make of tyres you have

iirc adz runs 40-50psi in his 33's so might be worth asking him

but from what i have read it seems the inch tyres need to be at a higher psi than the normal at tyres

A tire sized P265/75R15 112S inflated at the 30 psi front and rear recommended for your suv has a load carrying capacity of 2,319 lbs.

A LT31x10.50R15 109S sized tire at 30 psi has a load carrying capacity of just 1,595 lbs - dangerously low as it reduces total load capacity for your truck by a staggering 2,900 pounds! Even at the maximum inflation pressure of 50 psi a tire of this size can only carry 2,270 lbs which is barely adequate - equivalent roughly to driving with the stock tires under-inflated by 2 psi. If you do buy the 31's you absolutely need to increase your inflation pressure to 50 psi or you could have a safety issue. Under-inflation not only causes premature tire wear but it can also cause the tire to overheat and fail.

 

[lacroupade]

its is dependant on the make of tyres you have

iirc adz runs 40-50psi in his 33's so might be worth asking him

but from what i have read it seems the inch tyres need to be at a higher psi than the normal at tyres

OK...spoke to my tyre man as promised and its just as I thought. All borrox LOL!

This guy has run his tyre business for 30 years or more and does a lot of 4x4s, as well as commercial/agricultural and specialist forestry vehicles, not to mention a full mobile service. In other words, he knows his stuff.

Bottom line is that, if you fit larger tyres, regardless of type, he tells me no way should you be increasing tyre pressures above that which the vehicle manufacturer recommends for standard tyres. A larger tyre, of whatever type, is capable of carrying more weight than a smaller one and therefore needs less inflation.

If anything they want reducing in pressure, but he tells me that keeping the standard pressures (26psi or 1.8bar in the case of the Terrano on 235/70/R16s) should be fine.....but NOT increased above that.

I can understand why Adz would run higher pressures (assuming he does?) cos his normal ride is a lorry, where I suspect large tyres have higher pressures than car tyres....but thats cos they are carrying shedloads more weight proportionately.....on the Terrano, 40psi will not only wear your expensive new oversized tyres out more quickly but give you a bumpier ride to boot.....hope that settles the question :thumb2

 

[Stuarty]

Yep that does seem to make sense thanks for going to the trouble of finding this out as im sure it will be food for thought for some of us :thumb2

 

[Adz]

I can understand why Adz would run higher pressures (assuming he does?) cos his normal ride is a lorry, where I suspect large tyres have higher pressures than car tyres....but thats cos they are carrying shedloads more weight proportionately.....on the Terrano, 40psi will not only wear your expensive new oversized tyres out more quickly but give you a bumpier ride to boot.....hope that settles the question :thumb2

Do run 40 psi on the rear & 50 psi on the front of dirty frog on road but off road depending on surface, 5 psi to 40 psi :thumbs

After about a year on dirty frog, the rears have worn even & the fronts are all over the place coz of the idler :doh

 

[lacroupade]

Do run 40 psi on the rear & 50 psi on the front of dirty frog on road but off road depending on surface, 5 psi to 40 psi :thumbs

After about a year on dirty frog, the rears have worn even & the fronts are all over the place coz of the idler :doh

Yeah but you've got big knobblies haven't you (how's the treatment going by the way?:nenau) which I suspect won't show quite the same wear characteristics as say a more road-oriented tyre. And your ride must be like concrete surely?

Bit like I say, don't take my word for it....check with a decent tyre depot and see what they say....:thumbs