Question on tyres

[snake1978]

hey guys.
Ive just had my gq lifted 2inch , ironman all round.
At present it has 15in rims with i think 31x10.5x15 tyres

AFter the lift my fuel consumption went from 11.5 litres/100 to around 13.5
The original shock due to age, caused the tyres to wear wrong, making the steering wobble ( mostly between 85-100kmph)
Im wondering if when i replace the tyres what way should i go?
should i get new 15x8 rims and go 33's, or will that raise diesel consumption even more
should i source a set of 16in standard gq rims and run 16in tyres
should i stick with same size tyres i have


any suggestions appreciated ( btw 80% the car drives on tar and the odd trip up the beach)

[Warnie]

Lifing the car should not have done anything to the fuel consumption. Increasing tyre size will increase fuel consumption as now you need more force to turn the tyre. From 31" to 33" this difference should be minimal, but differs with hoiw you drve and your car. As for 15" vs 16" there is no real difference, I went with 16" as tyres are easier to come by in that size (285/75R16). The 33/12.5R15 is the most popular size in 33"s for a 15" rim and is around 1.25"s wider than the 285/75R16"s. The general move is towards bigger rims these days...

Hope that helps

[snake1978]

thanks for the tip.
i dunno why but fuel useage definately went up with the lift, around 2 litres per 100, i thought maybe a bit more wind drag

from people running 33s , can any1 tell me how much more fuel id go thru if i went to 33's?
also , alot of patrols came with 16in standard, would economy improve at all going from 15in to 16 inch rims? would it lower rpm sitting on 100kmhr ?

[growler2058]

My GQ had 16" rims standard but I went 15" sunny's so I'd have more sidewall on my 33's never checked fuel economy tho as the odometer is nackered

[Clunk]

I'm kinda thinking that it would be the type of tyre used not necessarily the size of the tyre that would affect fuel consumption...................... for example, a road trye would be better than and all terrain, an all terrain would be better than a muddy, etc etc............... again the wider the tyre, the more road resistance, therefore the higher the fuel consumption.......

I personally think.............. well I've bought a Patrol, they're big, heavy and thirsty, I bought it to have some fun in with the family and out and about with mates...... The fun factor far outways the cost of running the pretty little thing!!!! lol and we didn't buy these because they're frugal!!!! Just my thoughts

[snake1978]

yea true, id have thought like that 10 yrs ago too, but with rising fuel costs, carbon tax, and it being a daily commuter i have to consider fuel costs. if it was a weekend car it wouldnt be an issue

[Clunk]

yea true, id have thought like that 10 yrs ago too, but with rising fuel costs, carbon tax, and it being a daily commuter i have to consider fuel costs. if it was a weekend car it wouldnt be an issue

true true mate, maybe i should be thinking that way to............. it's also my daily driver lol

[YNOT]

thanks for the tip.
i dunno why but fuel useage definately went up with the lift, around 2 litres per 100, i thought maybe a bit more wind drag

from people running 33s , can any1 tell me how much more fuel id go thru if i went to 33's?
also , alot of patrols came with 16in standard, would economy improve at all going from 15in to 16 inch rims? would it lower rpm sitting on 100kmhr ?

The size of the rims will have no affect on fuel consumption, it comes down to the rolling circumference of the tyre and tread pattern. As said above highway type tyres will be better than mud tyres, all terrains somewhere in the middle.

Tony

[chester]

If 80% is on road driving and the rest is beach work,i would think about either leaving it with 31's or maybe even going a 32/11.5R15.
With a 2 inch lift they won't look out of place.The only advantage to having bigger tyre's is ground clearance under the diff pumkin.Going to a 33/12.5R15 will increace fuel use and also affect the power.

[makeitfit]

Have you checked your mpg properly allowing for the fact your speedo will be out now with bigger tyres? Check it with sat nav and so correct your numbers
Here in deepest darkest west wales (uk), I run my old beastie on Bio diesel ( that's used veggy oil and methonol and stuff) Cost about 60% the cost of diesel here so keeps the running costs right down Works a treat but does make me hungry all the time as it smells of the chip shop