Tire pressure for Syncro Doka 16

[0to60in6min]

thanks all for the help...

Mark - the sticker is exactly as the one posted by Dave (thanks Dave).

Jon - I think you're right on... I will try 30/35 or 35/40

according to the manufacturer it's 2,335 @ 65 PSI

dan

[davevickery]

[Jon_slider]

[crazyvwvanman]

Thanks for the sticker photo Dave.
Checked 2 load tables that best matched the 2 tires in question.
Assuming a stock tire is 205R16 RF 104

then 26 front and 30 rear
becomes
32 front and 36 rear

for LT225/75R16 110 D/8pr

to have about the same load capacity, as best I can determine.

I usually like a few more psi myself when loaded down than when empty.
Some vehicle stickers show different pressures for different loads.
One of my vehicles shows 12 different tires and lists various pressures for them depending on cargo/person loads.

Mark

[davevickery]

Yep Mark, it looks like you rounded up, and I rounded down. I think I would have gotten 31/36 but it was closer to 30/35 so I went with that. Anyway I think we are in the ballpark for minimums and I could see him wanting to put a little more anyway.

If anyone wants to compare, the OE 205R14 Reinforced, 104 ERTO is on page 31 and the LT225/75r16 on page 21. https://www.toyotires.com/media/2125/application_of_load_inflation_tables_20170203.pdf

[jadatis]

The car- and tiremakers calculate the advice pressure for the GAWR's.
Those are given on American cars on the same plate as the pressure advices.
But on European cars ( here the case) its given on the VIN-plate , wich must be on the car somewhere since 1980 .
But mayby when the car is directly made for the american market, this VIN-plate is not on the car.
So if you suspect this VIN-plate on your car, you have to search for it under the motorhood, or in one of te doorstyles.

Once you found it , for these GAWR's you have to calculate the pressure.
Because most busses on this forum are used as motorhome. the weights in use on the axles will be close to the GAWR, wich are called MTA ( maximum total axle ) or MPAW ( max permissable axle weight).

This calculation of pressure can be done linear as Jon Slider does, but the official used calculation gives a bit lower pressure.

Calculating back the GAWR's from the old advice pressures and tires, can give to low weight because of the pressure calculation used, but rounding up to the first 0.1 bar or 1 psi gives a bit higher weight when calculating back. And then sometimes the rounded up bar is conversed to psi and again rounded . so deteriming real used weight is not acurate
So first determine the GAWR's/MTA's/MPAW.

[jadatis]

Searched back a list Jon once sended me with GAWR's and GVWR of Vaganon. Most have front GAWR of 2646 lbs(= 1200 kg) and rear GAWR of 2866 lbs ( = 1300 kg)in the 2 wheel drive.

The calculation I gave is what the car-makers used, but its best to add 10% to that to cover unequal weight.
This still will not give unaceptable comfort and gripp.
I once deterimined that this border is when real weight on tire is less then 85% of the weight the pressure is calculated for for 160km/99m/h.
And yes also speed is a factor . Goal of pressure advice is to not overheat the tires for the speed and weight on tire.
Probably the Vaganon wont make the 99m/h so for lower speed the pressure can be lower.
I also found out the system the tiremakers use for speed.
But what I advice to calculate is adding 10% to the weights and calculate the pressure for 160km/99m/h and then you have the highest pressure , at wich comfort and gripp still is acceptable, and gives the largest possible reserve for things like , pressure loss in time, inacuracy of pressure device, misyudged real weight on tires, unequall weight R/L, etc etc.

[Jon_slider]

[Steve M.]

Good thread 'cause I'm running on my Syncro 16:


Weight 4923 lbs. (2461.5 lbs per axle.)
- cabinets installed, (some clothes, food.)
- spare tire mounted.
- plywood roof platform
- Fiamma F65 awning mounted
- my body weight 245 lbs.
----------
Front GAWR : 1300Kg. @ 01/20/2018  44psi
Rear GAWR:   1380Kg  @ 01/20/2018  47psi

Tires: Nokian Rotiiva A+.  225/75/16R
Max single load is 1215 Kg (2680 lbs.)

Seems to be rolling just fine. Not quite my "Big Wheel" days, but fine enough!
_________________
This free advice is worth exactly what you paid for it.

There are seven days in a week. Someday is not one of them.

[Jon_slider]

[0to60in6min]

another question is should we consider the weight of the engine if it's NOT a 2.1 WBX?... because other engines are heavier...
should we raise the rear a couple psi because it's not a WBX?

thanks

[Jon_slider]

[Steve M.]

[Wildthings]