Vigo tire pressure-laden and unladen

[jack2964]

On a 2.5L 2-wheel drive Toyota Vigo the sticker on the driver's side door jamb has two different figures to inflate to for unladen and laden vehicle. However on the 3.0L 4x4 Vigo the sticker shows 29psi for both laden and unladen. What gives? and why so?

[transam]

Yep, correct, though on my 4x4 l use 32 psi in the front and perfect for me.

[jack2964]

Thanks Transam but why is the 4x4 pressures unaffected by load? I know there must be a perfectly logical reason for Toyota to stick to 29psi for both cases. What could it be?

[transam]

Thanks Transam but why is the 4x4 pressures unaffected by load? I know there must be a perfectly logical reason for Toyota to stick to 29psi for both cases. What could it be?

Well seems they did their homework regarding traction. They suggest 29 psi in the rear with or without a Ton load. I have had a Ton load of tiles in the truck and it was OK. I wasn't happy with 29 psi in the front of my 4x4 and fooled around with pressures until l had a smile, 32 psi. Though on a non 4x4 perhaps 29 psi is OK.

[Jitar]

Are the tyres on the 2.5L 4x2 and 3.0 4x4 the same size, load rating and style? Light truck tyres used on lower spec work trucks tend to have higher load ratings and bigger differences in pressure for full load than the more standard construction tyres used on the higher spec models. .

[IMHO]

SImple - 4 door VIGO's can't carry even half the load weight of 2-doors.

[Kwasaki]

Thanks Transam but why is the 4x4 pressures unaffected by load? I know there must be a perfectly logical reason for Toyota to stick to 29psi for both cases. What could it be?

Simple 2.5 - 2W drive Vigo and 3.0 4x4 Vigo different animals.

Google Toyota Vigo specifications, lots to read.

[jack2964]

Thanks to all for your input but really my query is more to the physics involved here. I am having a hard time understanding why there is no need to pump higher pressures when the 3.0l 4x4 is carrying a heavy load. Far as I know, (could be wrong here though) the other Vigos as recommended by their respective door stickers need greater pressures when laden.

The stock tires on the 3.0l 4x4 are Bridgestone Dueler H/T 265/165 R17 all round. I understand if I change to another brand but keep the size (265/165R17) then I should stick to the recommended pressures of 29psi all round laden or not. So unless I am thoroughly wrong, changing tires should not should need a different set of inflation figures? Otherwise the sticker is misleading?

But the main issue is still why is laden and unladen the same. Sorry if I sound thick here, could someone explain this in layman's terms. Thanks.

[transam]

Vigo has had Bridgestone and Michelin fitted from factory using the same psi. Your question really can only be answered by Toyota tech. Any other ride l have had has given an advertised increase in pressure when having extra load at the rear, whether saloon or estate car. My only thought is the basic weight distribution of the 4 door or 4x4, 4x4 carries a lot more weight at the front.

[harrry]

Vigo has had Bridgestone and Michelin fitted from factory using the same psi. Your question really can only be answered by Toyota tech. Any other ride l have had has given an advertised increase in pressure when having extra load at the rear, whether saloon or estate car. My only thought is the basic weight distribution of the 4 door or 4x4, 4x4 carries a lot more weight at the front.

Would the leveling system toyota has help this?

[jack2964]

Vigo has had Bridgestone and Michelin fitted from factory using the same psi. Your question really can only be answered by Toyota tech. Any other ride l have had has given an advertised increase in pressure when having extra load at the rear, whether saloon or estate car. My only thought is the basic weight distribution of the 4 door or 4x4, 4x4 carries a lot more weight at the front.

Thanks again Transam, that is the model I have (4dr). I thought this would be a fairly easy question for folks who know about light trucks. Surely the physical laws are constant and if one needs extra pressure then the other ought to too. As I would think.

[transam]

My thought is a 4 door truck is designed as a workhorse and people carrier in general use. They don't expect the driver to keep fooling around every five minutes with tyre pressures throughout the day, sooooo after many hours of testing they concluded the 29 psi was safe to use with a load and retain the comfortable ride. ...........can't think of anything else...........

[stevenl]

Would be interesting to see the recommendation between 2-wheel drive 2 door, 2,5 door and 4 door.

[Ace of Pop]

Would be interesting to see the recommendation between 2-wheel drive 2 door, 2,5 door and 4 door.

Why.?.

[IMHO]

A 4-door VIGO has softer suspension tuning than a 2-door, and that 4WD and Preunner models have softer suspension again.

Put 500KG in the back of a 2.5L J single cab and it's barely noticeable. Put 500KG in the back of a Prerunner and it's almost dragging it's ass on the ground.

[Jitar]

Jack

My friend with a 2WD Dmax 4 door with 17” tyres tells me Isuzu also recommend 29 psi front and rear. 29 psi seem to be a popular recommendation among manufacturers but not so popular with owners. Up market pickups like the 4 door Hilux Pre Runner etc are similar to cars in that they are often lightly loaded, so pressure recommendations are largely determined by ride, handling and wear etc.

Toyota Thailand do not state gross weight limits for the Hilux (wonder why) but according to Toyota elsewhere:

Hilux 3.0L D4D 4 Door 4x4

Tare 1,925 + 815 = 2740 kg Gross Weight

265/65R17 tyres with load index around 110 (standard load rating ~880kg/tyre at 29 psi or 800 kg/tyre after de-rating for light truck).

The tyres are OK at 29 psi up to 1,600 kg per axle. In reality it would be difficult to load the full 815kg payload and keep the rear axle to this limit because the position of the tray or bed is too far rearward to distribute the weight between the axles. Toyota’s 815 kg load is a marketing value but if the load is less dense than gold bars, the rear tyres are going to be carrying more load and need more than 29 psi (and it will be almost dragging its ass around)

Light commercial vehicles can get closer to their tyre limits at max load, particularly variants with smaller tyre sizes, (basic pickups and vans).

Standard 2 door Hilux

Tare 1,620 + 1090 = 2710 kg Gross Weight

205/70R15C tyres with load index around 105

The smaller tyres on the 2 door truck have a lower load index and are also Light truck (load range C) tyres that need about 50 psi to achieve similar load rating to the bigger 17” tyres. Some 2 door trucks can and do carry 1 tonne loads and these need the higher tyre pressure. However when they are empty the rear axle load is much less so the stiff high pressure light truck tyres give a very rough ride, hence the different recommended pressure for laden and un-laden.

Any Tyre needs more pressure to carry more load but compared to the 2 door, the 4 door Hilux will see a less increase in load on the rear tyres between the theoretical laden / unladen conditions. If Toyota recommends the same pressure, they must think the difference in not significant and rely on the softer suspension IMHO referred to. The 4 door would still be better with more rear pressure for rear world heavy loads.

[mogandave]

If I had to guess, I would think differences is front-back and or loaded un-loaded would have more to do with safety and comfort, rather than load capacity.

Run 40-60 PSI on the back of an unloaded pickup and the ride is pretty miserable, and if you hit a bump while cornering the rear-end wants to come out from under you.

As far as the 29 PSI, it may or may not be a coincidence that it is almost exactly 2 Bar…

Also, the 29 PSI is a cold rating, so if your tires are inflated properly, when hot, they should check at 31-32. If you drive 100 km and air your tires to 29 PSI they are under inflated.

[jack2964]

====>Any Tyre needs more pressure to carry more load but compared to the 2 door, the 4 door Hilux will see a less increase in load on the rear tyres between the theoretical laden / unladen conditions. If Toyota recommends the same pressure, they must think the difference in not significant and rely on the softer suspension IMHO referred to. The 4 door would still be better with more rear pressure for rear world heavy loads. <===

I've taken this onboard and put in about 5psi over the recommended 29psi cold pressure for the rear when I 've got the truck loaded. I can visually tell the leaf springs flatten out a bit and the rear tyres too look 'compressed' when laden. With the extra 5psi, ride seems fine so I'll stick to this. Thanks Jitar.

[Ace of Pop]

If I had to guess, I would think differences is front-back and or loaded un-loaded would have more to do with safety and comfort, rather than load capacity.

Run 40-60 PSI on the back of an unloaded pickup and the ride is pretty miserable, and if you hit a bump while cornering the rear-end wants to come out from under you.

As far as the 29 PSI, it may or may not be a coincidence that it is almost exactly 2 Bar…

Also, the 29 PSI is a cold rating, so if your tires are inflated properly, when hot, they should check at 31-32. If you drive 100 km and air your tires to 29 PSI they are under inflated.

What a load of messing around .Where do you stick the Thermometer.What determins Hot, a Hot Day in Iceland,or Navada Dessert..

[mogandave]

If I had to guess, I would think differences is front-back and or loaded un-loaded would have more to do with safety and comfort, rather than load capacity.

Run 40-60 PSI on the back of an unloaded pickup and the ride is pretty miserable, and if you hit a bump while cornering the rear-end wants to come out from under you.

As far as the 29 PSI, it may or may not be a coincidence that it is almost exactly 2 Bar…

Also, the 29 PSI is a cold rating, so if your tires are inflated properly, when hot, they should check at 31-32. If you drive 100 km and air your tires to 29 PSI they are under inflated.

What a load of messing around .Where do you stick the Thermometer.What determins Hot, a Hot Day in Iceland,or Navada Dessert..

Cold just means ambient temperature.

Hot means after the car has been driven until the tires get hot.

Stick the thermometer in your…errr…exhaust.

[Ace of Pop]

OUCH.!! The Walls Ice Cream Vigo called in to Mom n Pops whilst our Friday Gang were slurping Leos. What Presure do you run on the Rears..?. No Idea,we leave Loaded,and bounce back to the Depot empty. My kinda reply.