Floaty feeling at higher speeds common?

[kimona]

Originally Posted by Rigaud

My 2009 2dr hatch swayed....floated on the highway before the sway bar was installed. It holds straight like on rails since.

My '07 suffered from terrible highway wander and float. I installed a rear TRD anti-sway bar which indeed helped with stability at cruise to some degree, but did not eliminate this problem. (Of course, handling in corners was much improved).

I experimented with multiple tyre tread patterns and tyre pressures with and without the anti-sway bar. I discovered that highway wander could be completely eliminated with the correct tyre; tread pattern is all important on the Yaris.

I learned to be very selective choosing the right tyres for my '07 and now my '14. I've always used 205/50/16's with 32 psi front and 29 psi rear. I'm on stock suspension, and I don't use the rear anti-sway bar. I can drive the car at 90MPH with no wander and no float.

[Pinchlite]

Originally Posted by Rigaud

32f - 28r
205/45R16
1ZZ throttle body and intake, header, 2-1/4" freeflow ss exhaust, lowered and TRD sway bar.
@ 95-100kph I do 5.4 to 5.6L/100km Hard driving.......7.4L/100km

Fuel economy is all about how you drive.
My 2009 2dr hatch swayed....floated on the highway before the sway bar was installed. It holds straight like on rails since.

How does a rear sway bar effect the front when driving in a straight line?

[Rigaud]

Originally Posted by Pinchlite

How does a rear sway bar effect the front when driving in a straight line?

Google it or search this site!

[Check Tha Rook]

Originally Posted by tmontague

It's likely the fact that the yaris is such a light car than many others that you're used to. I found running wider tires, rims with a wider offset and more negative camber helped a lot for high speed stability.

I run 40/36 f/r for tire pressure. Mainly because I travel a lot of km's a year and I found anything less caused ore nature seat on the shoulders of the tire relative to the middle. Any pressure higher than that and the bride was too rigid

How wide of a rim would will fit on the yaris without sacrificing functionality?

[DiCaprio]

I have 33 psi in both rear and front. And i feel like my car likes to oversteer, which is fun, but i'll probably go down to 31 in the rear and try again.

[tmontague]

Originally Posted by Check Tha Rook

How wide of a rim would will fit on the yaris without sacrificing functionality?

If you never want to worry about rubbing you can easily for a 6.5 inch wide with a +28 offset with 185 wide rubber. You'll also have more space for a wider tire on that set up.

Keep in mind this is with -2.8 camber front and -1.8 rear on lowering springs

I have also had 7inch wide +25 in the rear with 195 side r comp rubber and they rubbed by 1mm on the inner metal of the fender. I'll be rolling that to alleviate this issue.

So in short, 6.5 wide with +28 offset will be fine if you have camber bolts up front and a camber washer in the rear

[SirDigby]

Originally Posted by Pinchlite

How does a rear sway bar effect the front when driving in a straight line?

it does not have any effect unless you have strong cross wind. it's for cornering stability.

not sticky tires, eh? oh, you must have got the pilot sport A/S 3+
you're right. the UTQG is 500 AA A
my mistake...

[enviri]

Originally Posted by Check Tha Rook

How wide of a rim would will fit on the yaris without sacrificing functionality?

7 inches, +42/+38 offset is a nice happy place.

[kimona]

^^^ Exactly what enviri said. Plus, tyres no wider than 205mm.

[Lux]

Floating feeling at high speed is caused by two factors:

1. centrifugal tyre expansion
2. aerodynamic lift

The Yaris is not equipped with any aero to help with high speed stability. You would need an extensive combination of underbody paneling, front spoiler and canard, and rear wing. A rear diffuser is difficult to package for clearance of the torsion beam.

High performance tyres can help resist centrifugal expansion. I've had 225/50R15 Z-rated tyres all around on my car before and the floating sensation at 180 km/h had moderately subsided. Really, the car needs more serious aero work because the low kerb weight makes is susceptible to sudden wind and road surface changes.

[NYC-SE]

Originally Posted by tmontague

I run 40/36 f/r for tire pressure. I found anything less caused ore nature seat on the shoulders of the tire relative to the middle.

? Can we have the auto correct translation?

Originally Posted by tmontague

Any pressure higher than that and the bride was too rigid

Next time try plying her with alcohol.

[kimona]

Originally Posted by NYC-SE

Next time try plying her with alcohol.

Thanks for the laugh!