4.5 petty 105 landcruiser owners. Regarding 33's

Submitted: Friday, Jun 06, 2014 at 12:23
ThreadID: 108135 Views:1637 Replies:8 FollowUps:5
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Wanting to put 285 75 16 on my 105, it currently has 265 75 16.
After somebody who has put this size on and can speak from experience on this car.
it is a 4.5l petty/gas and its the 4spd autobox.

How much economy did you lose?
Gearing?
etc....

cheers
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Reply By: Freshstart - Friday, Jun 06, 2014 at 12:26

Friday, Jun 06, 2014 at 12:26
I know that you wanted "like cars" but on our 4.2td auto, we lost 2 litres per hundred going from 265s to 285s.
AnswerID: 533834

Follow Up By: matth j - Friday, Jun 06, 2014 at 13:04

Friday, Jun 06, 2014 at 13:04
I guessing you also changed to a mud terrain for that result?? if that's the case for my 4.5 I will stick with 265 75 16's
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Reply By: Ross M - Friday, Jun 06, 2014 at 13:06

Friday, Jun 06, 2014 at 13:06
Two things against you there,

Larger diameter ie, over gearing, harder for engine to push it along = more fuel.

Wider tyre requires more effort to roll it along than a narrower tyre does = more fuel

PLUS

If the 265 does the job, it is probably quite a bit cheaper than the 285 = more $$$$$

So I lied, it is three things not so much in your favour.
AnswerID: 533839

Follow Up By: matth j - Friday, Jun 06, 2014 at 13:10

Friday, Jun 06, 2014 at 13:10
yeah that seems correct although I thought if there was not much difference in performance and fuel I could use them, looks like 265's will do the job at least for a couple years.
cheers
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Reply By: Ozrover - Friday, Jun 06, 2014 at 13:37

Friday, Jun 06, 2014 at 13:37
The wife has the same car with 285s on it, yes they are heavy on fuel, but realistically, it has more to do with how heavy the right foot is.

She actually gets better economy than my V8 Dual cab between Tennant Creek & Alice, but I do it in shorter time... ;)
AnswerID: 533844

Reply By: Member - Colin E - Friday, Jun 06, 2014 at 13:54

Friday, Jun 06, 2014 at 13:54
I have 1HZJ diesel when i went from 235/85 I also changed beehive snorkle top to an open one my economy improved 1L/100k.
I also changed the last section of my exhaust to 3" and no second muffler economy improved again 1-2 L.
But I do drive easy averaging 14.4 - 15L /100k around town .
Each time i fillup i put it in my VMS now and get good readings
Colin
AnswerID: 533846

Follow Up By: scandal - Friday, Jun 06, 2014 at 18:23

Friday, Jun 06, 2014 at 18:23
I also have a 1HZ in a 105 series cruiser, I'm still using 235/85, still have the factory snorkel, but have an aftermarket turbo and 3 inch exhaust.
I normally drive conservatively, I consistently get high 12's-13/100ks, It didnt change much after the turbo went on IF driven sensibly, start stomping on it and you will PAY (but now it goes good) I live 29k's from work which is mostly 80kph zone, a few roundabouts 2 t-intersections and about a dozen sets of traffic lights , 1 am starts means no traffic, coming home can be a bit stop start, my last main/sub tanks took 122 liters for 1015 kilometers.
Mine doesn't like freeway speeds nor towing the camper(1.4ton) with the combination of both, it willl go out to 18-19/100k
Just adding bigger tyres will generally drop 1-2 liters/100, add weight such as bullbars, winch, draw systems, roofrack and that will all add up pretty quick knocking fuel economy, just like making little adjustsments can make the fuel economy improve,
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Follow Up By: Member - Colin E - Saturday, Jun 07, 2014 at 11:13

Saturday, Jun 07, 2014 at 11:13
I also have a rooftop tent
When i canged the rear exhaust because it was crushed i had a noticeable improvement in power this is a regular hill i go over with matching conditions
I do not use 5th gear at all sue to horrible noise but cruise very happily at 90 about 2500 revs
The speedo reads 3-4k under the gps
You only get accurate fuel economy if you calculate ever fill and the new gps's you can fill it in as you fill up
I am looking forward to putting Turbo in in june next year
But very pleased with the larger tyres and mostly just the $350 i spent on the exhaust
Colin
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Reply By: Rod W - Friday, Jun 06, 2014 at 14:23

Friday, Jun 06, 2014 at 14:23
Matth do you have a GPS? If so whats the speed difference between the GPS and the vehicle?

I did have a 75 series with the 1FZFE 4.5lt petrol 5 speed manual, it also had 10R x 15" tyres. The speedo didn't match the GPS. The engine was screaming its head off so to speak, thus using more fuel. I replaced the tyres with 285's and immediately the GPS and vehicle speedo matched and the engine ran a lot quieter.
AnswerID: 533852

Reply By: matth j - Friday, Jun 06, 2014 at 16:57

Friday, Jun 06, 2014 at 16:57
Thanks for the help. I do not have a gps and cant really afford mods like exhaust etc at the moment. I think I might stay with 32's and see how I go, maybe change size after them! Cheers
AnswerID: 533862

Reply By: Member - Odog - Friday, Jun 06, 2014 at 18:52

Friday, Jun 06, 2014 at 18:52
G'day Matth j
I had same vehicle, but no gas, went from the 265/75 16 to the larger 285/75 16...
Made it feel very under powered, and found on the hwy, 5th gear (manual) was not really needed.
Did use more fuel, don't no exactly how much, but just that loss of torque, was really noticeable, and was a big disappointment.
I knew it would change the way it drove, but not that much.
Ended up trading it not much longer after that.
Hope this helps. Cheers. Odog
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Reply By: matth j - Friday, Jun 06, 2014 at 20:40

Friday, Jun 06, 2014 at 20:40
Thats for that mate!
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Follow Up By: MUZBRY- Life member(Vic) - Sunday, Jun 08, 2014 at 09:57

Sunday, Jun 08, 2014 at 09:57
Gday Matt
I have a 105 with 285.75. r16 and my average fuel use around Melbourne is for the last three fills is 12.9 / 13.25 / 13.9 ltrs /100. It just depends how far you push the pedal down.. Power , not a lot but good enough for me. Up in the high country the 105 goes where all the others go and at the same speed .

Muzbry
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