dnguyent

iTrader: (5)

I just read through "Inflation Pressure Part 3 - Plus Sizing" that can be found in http://www.toyo.com.au/

If I follow their advice regarding adjusting tire pressures for plus-sized tires, I should end up with 40psi in the front and 37psi in the rear.

Can someone else confirm whether this is correct?

Front 17" OEM 94W rating; recommended pressure: 35psi
Rear 17" OEM 96W rating; recommended pressure: 35psi

Front T1S 93Y rating; from table: 40psi for equiv OEM load rating.
Rear T1S 96Y rating; from table: 37psi for equiv OEM load rating.

Some extrapolation from those charts would be necessary.

grifferjr

I guess that sounds about right. i am not coming from a technical background but rather a better background: a practical one. when i bought my plus sized 19's, almost the same size as yours but falkens, the people knew nothing. they said that the OEM pressures would still be okay. well the car handled like crap. so much so that i actually started hating the new tires and rims, thought they trashed the cars handling. then i read up on the whole ordeal and realized i needed more psi in them. this advice came from a tech at the local alignment shop after i even went the route to have the alignment done twice to try and solve the problem (figured new size tires=need for new alignment). the guy there suggested trying higher cold psi.

i went from 35 to 40 first thing and "good god" did that make a difference. loved it. then i went from 40 to 43 and better right off the bat but after a while of driving the tires got too bouncy. even went to 45 cold and more of same thing. so i went back to 40 psi cold all around and the cars handles great again. guess the 35psi was too little and the car just felt soft in the corners.

main thing here is to just double check the tires max cold psi rating: mine is 50psi.

dnguyent

iTrader: (5)

I also found marked improvement in handling. Although steering response is still not as razor sharp as what I had with the thinner OEM's, it improved drastically. For a while I was convinced that I wanted nothing to do with Toyos anymore, but now, I'm quite happy with them.

I just wish the tire manufacturers and vendors would be more proactive in educating us and providing better instructions. In the long run, it would help them sell more of their own tires and retain brand loyalty. Toyo almost lost me until I ran into this bit of info.

I now run 40psi up front and 38psi in the back, and am very happy with it. Max pressure allowed is 50 psi and 44 psi, respectively, so I'm not worried about blowing anything up.