questions about milege consumtion from tyres

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redhand said:
Bigger tyres equals increased fuel consumption. you've put bigger tyre on your landy.

Is it getting clearer??
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yeah but my consumption has GONE THROUGH THE ROOF, it should not be that noticeable

i'd say it was around + 30-40% on fuel from the old tyres
 
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redhand said:
Ok back to basics What was you getting before the tyre change and what are you getting now?
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not sure about mpg but after changing the normal standard tyres to the larger ones my fuel is around + 30-40%, it's very noticable, do you think it could be the type of tyre? there AT tyres but you could mistake them for mud tyres


also, the tyres seem a lot slower
 
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Your fuel consumption is up coz your oil is the wrong type for the new tyres. You need to start the engine, undo the sump plug and rinse out the oil with a hose pipe in your oil filler cap.

Then when all the oil has gone, drive down to your nearest motor supply shop and ask for some new oil to suit your 2 new tyres.

This will put your fuel consumption back to normal, maybe even improve it.
 
Green Bob said:
Your fuel consumption is up coz your oil is the wrong type for the new tyres. You need to start the engine, undo the sump plug and rinse out the oil with a hose pipe in your oil filler cap.

Then when all the oil has gone, drive down to your nearest motor supply shop and ask for some new oil to suit your 2 new tyres.

This will put your fuel consumption back to normal, maybe even improve it.
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thanx for that, your a star
 
spannerz said:
not sure about mpg but after changing the normal standard tyres to the larger ones my fuel is around + 30-40%, it's very noticable, do you think it could be the type of tyre? there AT tyres but you could mistake them for mud tyres


also, the tyres seem a lot slower
Click to expand...

Well you need to fill ya tank up till the pump clicks and drive it around as you would normally and when you've done around 100 miles or so go back to the same garage and fill it back to the brim again this will tell you exactly how much fuel you're using. Once we know that we can start to figure out if there is a problem.
 
redhand said:
Well you need to fill ya tank up till the pump clicks and drive it around as you would normally and when you've done around 100 miles or so go back to the same garage and fill it back to the brim again this will tell you exactly how much fuel you're using. Once we know that we can start to figure out if there is a problem.
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thanx i will do that, what is an average mpg?
 
redhand said:
Around 28/32 depending on what sort of driving you're doing.
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thanx red :D it's mostly on tarmac but i need the clearance for going through fields and up dirt roads, if i thought buying a new set of tyres would fix it then i would, but £500 is a lot to spend to find out that i need to put on the normal smaller ones to get back my mpg back to normal
 
spannerz said:
that thread is much like this one...5 usefull posts the rest is people tryin to be funny

can you explain so a 5 year old would understand

also i never use diff lock
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when driving in a straight line all the wheels turn at the same speed.

When turning the outside front wheel has to turn further than the inside front wheel. The same happens with the rear wheels but they will under cut the route taken by the front wheels. For this reason the diffs are unlocked.

If you engage difflock you lock the front and rear propshafts together. As the wheels are all trying to go around at the same speed and cornering means this can't happen, the transmission winds up like a coiled spring. When it can't take any more something gives out with catastrophic consequences.

If you engage difflock on a slippery surface the wind up is prevented when the wheels lose traction and slip. This is because any wind up is released everytime a wheel spins. On tarmac the wheels grip too well to allow them to spin, thus being unable to release the built up pressure.

tyres that are different sizes will be constantly winding up the transmission.

A big tyre rotates less times in a measured distance than a small tyre. This means that the speedo will show the vehicle covering less distance than it was. It also requires more power to turn a larger wheel.

In plain english...If someone counted how many small steps it took from one end of a football pitch to the other while another person took big paces. The big paces would be a lower number than the small ones.
 
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