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Better fuel econamy with bigger tyres
Better fuel econamy with bigger tyres
Hi All
i have just fitted 225/75/16s to my 04 Grand Vitara and i knew the fuel would go down a little but i now baby the car to get 430Ks from a 60L tank and before i drove with the foot flat to the floor and got 500Ks from a tank.
i also have found the old girl to be very slugish of the line.
i want it to feel better and bring back a little fuel econamy, i dont have the time or money to do gear swapping and wanted to know of any other ways to help the problem in a gv
thanks
tim
i have just fitted 225/75/16s to my 04 Grand Vitara and i knew the fuel would go down a little but i now baby the car to get 430Ks from a 60L tank and before i drove with the foot flat to the floor and got 500Ks from a tank.
i also have found the old girl to be very slugish of the line.
i want it to feel better and bring back a little fuel econamy, i dont have the time or money to do gear swapping and wanted to know of any other ways to help the problem in a gv
thanks
tim
www.outdoorauto.com.au - we love doing new GVs....
did a couple of gv's where i changed the diff ratios to 5.1's and installed airlockers. was quite a job but resulted in the owners gaining 100-150 k's out of thier tank. oh, the extra power was a plus too.
lwb 1.6efi,4sp auto,f&r airlockers,dual t/cases.custom coils.builder of ROAD LEGAL custom suzukis...and other stuff.
CAD modelling-TECH drawings-DXF preparation.
http://www.auszookers.com/index.php
CAD modelling-TECH drawings-DXF preparation.
http://www.auszookers.com/index.php
#1 have you corrected your speedo? (or corrected your results?)
What's happened to your gearing? (i.e what have your cruise revs dropped to?) - sometimes going up in tyre size will result in the car not locking the converter, for instance, in an auto, and therefore using a lot more fuel. Modern cars that are geared for maximum economy at a given speed won't like the added load and lowered revs larger tyres impart.
The aerodynamic changes and the rolling resistance should only we worth a couple of % by themselves.
Steve.
What's happened to your gearing? (i.e what have your cruise revs dropped to?) - sometimes going up in tyre size will result in the car not locking the converter, for instance, in an auto, and therefore using a lot more fuel. Modern cars that are geared for maximum economy at a given speed won't like the added load and lowered revs larger tyres impart.
The aerodynamic changes and the rolling resistance should only we worth a couple of % by themselves.
Steve.
[quote="greg"] some say he is a man without happy dreams, or that he sees silver linings on clouds and wonders why they are not platinum... all we know, is he's called the stevie.[/quote]
i have a manuel and i have not corrected the speedo but i have been watching the rpms and try and stay away from 3000 as it sucks the juice and
I also now have to drop agear going up hills which also uses more fuel.
lockers and gears would be nice but i dont have the time or funds.
im looking at other ways i can change it
I also now have to drop agear going up hills which also uses more fuel.
lockers and gears would be nice but i dont have the time or funds.
im looking at other ways i can change it
www.outdoorauto.com.au - we love doing new GVs....
you need to add 5% to your readings - so 430 = 450 straight away.
If you're driving all below 3K I reckon you're probably lugging the motor. I assume you're a V6? They're not that keen to chug.
With the added load of the taller, more aggressive tyres There's going to be a lot more load than stock.
Checked inflation pressures?
Did you do anything else at the same time like more lift? This will play a part too.
Steve.
If you're driving all below 3K I reckon you're probably lugging the motor. I assume you're a V6? They're not that keen to chug.
With the added load of the taller, more aggressive tyres There's going to be a lot more load than stock.
Checked inflation pressures?
Did you do anything else at the same time like more lift? This will play a part too.
Steve.
[quote="greg"] some say he is a man without happy dreams, or that he sees silver linings on clouds and wonders why they are not platinum... all we know, is he's called the stevie.[/quote]
so the new lift went on just before the new tyres?
Did you ever drive it with the lift before the new tyres?
You will have lost economy with the lift - increased aerodynamic drag and angle on uni's/CV's will be sapping some power.
Check tyre pressures for sure. Those tyres are going to have a LOT more rolling resistance than stock.
Steve.
Did you ever drive it with the lift before the new tyres?
You will have lost economy with the lift - increased aerodynamic drag and angle on uni's/CV's will be sapping some power.
Check tyre pressures for sure. Those tyres are going to have a LOT more rolling resistance than stock.
Steve.
[quote="greg"] some say he is a man without happy dreams, or that he sees silver linings on clouds and wonders why they are not platinum... all we know, is he's called the stevie.[/quote]
welcme to owning a modified 4x4 =P haha
i dont know about the V6s, but the 4cyls like to rev... if you baby the engine your fuel economy will suck... take off fast in first and keep the revs up after that. i try to cruise between 2500-3000rpm, 3400 is 100k km/hr on mine.
i dont know about the V6s, but the 4cyls like to rev... if you baby the engine your fuel economy will suck... take off fast in first and keep the revs up after that. i try to cruise between 2500-3000rpm, 3400 is 100k km/hr on mine.
The worst thing about censorship is ███████.
i need these tyres but losing 100ks from a tank even when babying is hard, just trying to get some back!
i know it wont be the same as before but just an extra 30 - 50ks will make a big difference and i would be very happy with that...
the next experiment is i fill her tomorrow and drive normally and see how we go!!!
i know it wont be the same as before but just an extra 30 - 50ks will make a big difference and i would be very happy with that...
the next experiment is i fill her tomorrow and drive normally and see how we go!!!
www.outdoorauto.com.au - we love doing new GVs....
What pressure u running, with the bajas on the road, suzis recomend pressure is a bit low, they say 19psi, i run them about 25psi.fordy1 wrote:i need these tyres but losing 100ks from a tank even when babying is hard, just trying to get some back!
i know it wont be the same as before but just an extra 30 - 50ks will make a big difference and i would be very happy with that...
the next experiment is i fill her tomorrow and drive normally and see how we go!!!
When im at 5psi on the road, crikey duz she get thirsty
If it breaks, excellent, time for an upgrade
Like it's been said your odometer is probably out by a bit so it may not be 100kms.fordy1 wrote:i need these tyres but losing 100ks from a tank even when babying is hard, just trying to get some back!
i know it wont be the same as before but just an extra 30 - 50ks will make a big difference and i would be very happy with that...
the next experiment is i fill her tomorrow and drive normally and see how we go!!!
Build Thread - http://www.outerlimits4x4.com/viewtopic.php?f=16&t=168546&p=1927514&hilit=GRPABT1%27s+zook#p1927514
mmm should be about 8.1% as noted from friend with the same gv and size tyres - 430Ks = 464.83 not bad , i will recalculate when next tank is used
the main thing is not being able to fill up just once a week and the lack of right foot when she who must be obayed drives
thanks all for your input
the main thing is not being able to fill up just once a week and the lack of right foot when she who must be obayed drives
thanks all for your input
www.outdoorauto.com.au - we love doing new GVs....
I've recently put 31's on my 4 cylinder, and yes, you will use more fuel if you regularly go up hills, and do stop start driving.
Just a quick google says your engine's max torque is at 3300 rpm, that rpm is when your engine is running most efficiently, so theoretically try and cruise at around 3300rpm...
Also, try drafting behind semi trailers
Just a quick google says your engine's max torque is at 3300 rpm, that rpm is when your engine is running most efficiently, so theoretically try and cruise at around 3300rpm...
Also, try drafting behind semi trailers
=/_____________\=
/[__\\___S___//__]\
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I--------[vitara]------I
I___I'''''''''''''''''''''I___I
/[__\\___S___//__]\
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I--------[vitara]------I
I___I'''''''''''''''''''''I___I
I used to run some 30" chunky muds, 9.5 wide with a 16valve 1.6efi. I used to get 9km's per litre. Now with standard sized tires im getting nearly 12km's per litre. These figures are not exact, but pretty close and i did no other mods. And it has heaps more accelleration and i dont have to put the accellerator down as much to go somewhere.
zook comming soon......
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