Question for those running 33" tyres

[Nick V]

Can any of you folks out there running 33" tyres tell me if you have noticed a real difference in fuel consumption compared to when you ran the standard size?

I want to change to 33" myself, but if there is a great difference, I will wait untill I can afford to change the diffs,

Cheers, Nick

[surfstar]

Can any of you folks out there running 33" tyres tell me if you have noticed a real difference in fuel consumption compared to when you ran the standard size?

I want to change to 33" myself, but if there is a great difference, I will wait untill I can afford to change the diffs,

Cheers, Nick

Put it like this, mine came with 33" BFGs on it and my surf does 15 MPG which is terrible. I have a set of 31" BFGs but would not ever consider a down size as the 33s are the ultimate. I belive you need a 4" lift to run 33's

[Nick V]

Put it like this, mine came with 33" BFGs on it and my surf does 15 MPG which is terrible. I have a set of 31" BFGs but would not ever consider a down size as the 33s are the ultimate. I belive you need a 4" lift to run 33's

That's a lot worse than I expected I have a suspension lift and will be adding a body lift for now as that's the cheapest option

Cheers, Nick

[TonyN]

A lot depend how you drive, if you try and drive with the same acceration and zip it will really suffer, if you can keep you foot out of the throttle and cruise I be looking at maybe 2-4 mpg loss normally. If you do a lot of motorway cruising and are light on throttle you can get better MPG as the RPM's are lower, as long as its not bogging down out of the power band causing you to have to squeeze the throttle more.

[ecosurf]

My gorgeous truck (just gave her a good polish, so she's extra gorgeous today!) runs 33" BF Goodrich tyres. They were on the truck when I bought it, and apparently the suspension lift and uprated tyres were done in Japan, along with modified speedo and gears, to accomodate the size (not sure exactly what was done, not that mechanically minded).

As such, I achieve between 21 (heavy city, drag racing, off road) 26 (city, i.e. going to work) and 31 (highway). I use a combination of Biodiesel and regular, which apparently helps a bit (plus you can get Bio for 80ppl)

Plus I recon it looks AWESOME with big tyres!

[golly]

big tyres

Can any of you folks out there running 33" tyres tell me if you have noticed a real difference in fuel consumption compared to when you ran the standard size?

I want to change to 33" myself, but if there is a great difference, I will wait untill I can afford to change the diffs,

Cheers, Nick

my tyres are 285/75/16 bfg ko at's same as 33" 26mpg less if you gas it all the time. if you run tyres at 32psi mpg should not change that much but if you run them at a low pressure then you will use a lot of fuel
was your kit car done at holeshot i ave a busa an i have seen the cars at holeshot nice kit.
gollygone

[Nick V]

my tyres are 285/75/16 bfg ko at's same as 33" 26mpg less if you gas it all the time. if you run tyres at 32psi mpg should not change that much but if you run them at a low pressure then you will use a lot of fuel
was your kit car done at holeshot i ave a busa an i have seen the cars at holeshot nice kit.
gollygone

Thanks for the info folks

Golly, not been to Holeshot for any work but have spoken to them and they are very helpful. Will be getting some parts from them in the near future so may take a trip up there myself. Then of course there is the turbo conversion for the Busa.......................... .........

Cheers, Nick

Nick

[Nick V]

How can I tell if the torsion bars are uprated or not, and how can I tell how much further they can lift the front end up?

Cheers, Nick

[TOYMOTA]

Can any of you folks out there running 33" tyres tell me if you have noticed a real difference in fuel consumption compared to when you ran the standard size?

I want to change to 33" myself, but if there is a great difference, I will wait untill I can afford to change the diffs,

Cheers, Nick

I used to run 31,s and changed to 33,s can,t say i noticed a difference in mpg or speed it still feels the same(thirsty and slow)but i didn,t buy the truck for economy and performance anyway.

[TonyN]

How can I tell if the torsion bars are uprated or not, and how can I tell how much further they can lift the front end up?

Cheers, Nick

They are normally red! but should be thicker diameter than standard bars. 22.8mm is stock on IFS pickups, not sure about Surfs but not going out in the cold to measure now!!!

Uprated bars are 24 or 26mm. Trucks are normally set at the factory at about 13.5 - 14" from top of wheel rim to bottom of wheel arch. Its not a great idea to go over 1 1/2" of lift or you may eat CV's or rip CV gaiters due to the steeper CV angle. Fitting Manual hubs overcomes this problem, but you do lose your 'shift on the fly' 4WD ability.

[laser_jock99]

A lot depend how you drive, if you try and drive with the same acceration and zip it will really suffer, if you can keep you foot out of the throttle and cruise I be looking at maybe 2-4 mpg loss normally. If you do a lot of motorway cruising and are light on throttle you can get better MPG as the RPM's are lower, as long as its not bogging down out of the power band causing you to have to squeeze the throttle more.

I'd agree with that. Used to get 25mpg on 31" tyres now getting about 22mpg on 33" General Grabbers with big mud terrain tread. All Terrain tread might return a little better mpg.

[da SLUG man]

remember the speedo's slightly out too with bigger tyres...

[TonyN]

remember the speedo's slightly out too with bigger tyres...

Speedos have been out for ages.......

[da SLUG man]

Speedos have been out for ages.......

not as long as wheels!

[Nick V]

They are normally red! but should be thicker diameter than standard bars. 22.8mm is stock on IFS pickups, not sure about Surfs but not going out in the cold to measure now!!!

Uprated bars are 24 or 26mm. Trucks are normally set at the factory at about 13.5 - 14" from top of wheel rim to bottom of wheel arch. Its not a great idea to go over 1 1/2" of lift or you may eat CV's or rip CV gaiters due to the steeper CV angle. Fitting Manual hubs overcomes this problem, but you do lose your 'shift on the fly' 4WD ability.

Just been out and checked, the height from very top of rim to bottom of arch is 14" but did not bother getting light out to check the diameter of bars.

Can I assume that I can wind the bars up to give another 1 1/2" of lift if I need to, combined with a body lift kit of 1 1/2" - 2" plus rear spring spacers, and wheels spacers, will give me enough clearance to fit the 33" tyres?

So many questions eh

Cheers, Nick