Floaty feeling at higher speeds common?

[Pinchlite]

2007 2 DR HB.

The car handles great,new dampers all round with 1.5 drop.205/50/R16.Michelin pilot a3+(not sure if thats correct tire name)

The car does not pull or feel bad,but it just kind of feels as the front end is getting airborne...of course its not but thats best way to describe.The steering also becomes very,or more sensitive.This is 140 kmh.I know,Iknow but I was going with the flow.This was the first real highway drive I have had with my yaris btw.

Someone mentioned low tire pressure?.I have 38 psi like kal tire put it at...

[SirDigby]

uh...that's really high tire pressure. since your city is at 249 feet (76m) i'd put them sticky shits at 28psi-30psi (193kPa-207kPa)
do you have a print out of your alignment? sounds like a toe issue maybe. are the tires rotating the correct direction? sometimes tires mounted in the wrong direction will have this effect.
there is differently something wrong. did you install adjustable sway-bar end-links with your drop? what brand of strut/shock/springs?
i do that speed everyday, stock suspension with 80,000 miles (128,750km) on them. (upper strut brace, rear sway bar have no effect on straight line) feels comfortable all the way to 112mph. (180kmh)

[kimona]

When I had my '07, I increased the tyre pressure (on my 205/50/16's) to 38PSI, the car bounced around like a basketball at low speeds and felt like it was floating at higher speeds. Drop your tyre pressure to about 30PSI and see if it makes a difference.

[Pinchlite]

When I had my '07, I increased the tyre pressure (on my 205/50/16's) to 38PSI, the car bounced around like a basketball at low speeds and felt like it was floating at higher speeds. Drop your tyre pressure to about 30PSI and see if it makes a difference.

Whoa!...30 PSI?
I dont feel bouncing at any.The ride is pretty tight.Maybe you had worn dampers?

I will get shit mileage at 30 psi?

[dogsridewith]

Driving unloaded? At least evaluate w/ the 38 front and 30 psi in rear.
Handling is a lot about what I recall are called slip angles--something like angle between aim of rim and path of tire contact patch? Has to be slip angle to generate cornering force. Slip angle is inversely dependent on tire pressure...at least until things get really broken loose. Old rear engine air cooled Beetles had weight bias as severe the other direction as our 3-door Yaris. Rear tire pressure at least 5 psi higher than front really helped control oversteer. Maybe your front end floating sensation at speed is some understeer?

[kimona]

Whoa!...30 PSI?
I dont feel bouncing at any.The ride is pretty tight.Maybe you had worn dampers?

I will get shit mileage at 30 psi?

The information I provided was when my '07 was new and I was experimenting with tyre tread patterns and tyre pressure.



Here's recommended tyre pressures for the Yaris: http://blog.toyota.co.uk/toyota-tyre-pressure-and-size-guide#Yaris

Tyre Pressure:

14-inch wheels (175/70/14): The front tyres should be inflated to 36 psi. The rear tyres should be inflated to 35 psi.

15-inch wheels (175/65/15; 185/60/15): The front tyres should be inflated to a minimum of 33 psi and to a maximum of 36 psi. The rear tyres should be inflated to a minimum of 32 psi and to a maximum of 35 psi.

16-inch wheels (195/50/16; 205/50/16): The front tyres should be inflated to 32 psi for speeds below 99mph and 35 for speeds above. The rear tyres should be inflated to 29 psi for speeds below 99mph and 30 for speeds above.

[enviri]

16-inch wheels (195/50/16; 205/50/16): The front tyres should be inflated to 32 psi for speeds below 99mph and 35 for speeds above. The rear tyres should be inflated to 29 psi for speeds below 99mph and 30 for speeds above.

WOAH! i played around with pressure alot on my car and i ended up with 33 front 31 rear just last week because the car didn't feel right!! I didnt know i was so spot on lol. (sw connecticut highways go from 70-110mph cause everyone here drives high end german/italian no one gives a damn lol.)

[MadMax]

Whoa!...30 PSI?
I dont feel bouncing at any.The ride is pretty tight.Maybe you had worn dampers?

I will get shit mileage at 30 psi?

No, but you're tires will last longer and you'll get better traction out of them.

This car gets decent enough gas mileage, I don't understand this infatuation with squeezing an extra couple of miles out of a gallon. Most of the time it's at a sacrifice to handling or even safety.

There is a balance to be achieved when it comes to tire pressure, enough to maximize the mileage, traction and handling. If you increase one of those factors, you decrease others. Simple physics.

[Pinchlite]

The information I provided was when my '07 was new and I was experimenting with tyre tread patterns and tyre pressure.



Here's recommended tyre pressures for the Yaris: http://blog.toyota.co.uk/toyota-tyre-pressure-and-size-guide#Yaris

Tyre Pressure:

14-inch wheels (175/70/14): The front tyres should be inflated to 36 psi. The rear tyres should be inflated to 35 psi.

15-inch wheels (175/65/15; 185/60/15): The front tyres should be inflated to a minimum of 33 psi and to a maximum of 36 psi. The rear tyres should be inflated to a minimum of 32 psi and to a maximum of 35 psi.

16-inch wheels (195/50/16; 205/50/16): The front tyres should be inflated to 32 psi for speeds below 99mph and 35 for speeds above. The rear tyres should be inflated to 29 psi for speeds below 99mph and 30 for speeds above.

Alright then.I will give this a go when tires are cold in the morning.

32 and 29 psi.

Looks like the tire place just went with what was on the door jam.

[Pinchlite]

No, but you're tires will last longer and you'll get better traction out of them.

This car gets decent enough gas mileage, I don't understand this infatuation with squeezing an extra couple of miles out of a gallon. Most of the time it's at a sacrifice to handling or even safety.

There is a balance to be achieved when it comes to tire pressure, enough to maximize the mileage, traction and handling. If you increase one of those factors, you decrease others. Simple physics.

Going to go 32 and 29 front/back.

Thanks for insight.

[IllusionX]

44psi like any hypermiller. Haha

TBH, I run 35psi all around. Verify it at room temp, in shade.

Sent from my SM-G930W8 using Tapatalk

[Pinchlite]

44psi like any hypermiller. Haha

TBH, I run 35psi all around. Verify it at room temp, in shade.

Sent from my SM-G930W8 using Tapatalk

gong to try this 32 and 29 psi after reading comments from what I think are some really knowledgable fellas.

Makes sense to have less in the rear.

I do appreciate the reply though.

[Rigaud]

Did you instal a rear sway bar?

[SirDigby]

Whoa!...30 PSI?
I will get shit mileage at 30 psi?

you don't buy Michelin Pilot Sport 3 tires to get better fuel millage. :laugh:
if your goal is fuel millage you buy those silly low rolling resistance tires.
if you buy performance tires, your goal should be maximum performance, otherwise save yourself $200(USD)

[Pinchlite]

uh...that's really high tire pressure. since your city is at 249 feet (76m) i'd put them sticky shits at 28psi-30psi (193kPa-207kPa)
do you have a print out of your alignment? sounds like a toe issue maybe. are the tires rotating the correct direction? sometimes tires mounted in the wrong direction will have this effect.
there is differently something wrong. did you install adjustable sway-bar end-links with your drop? what brand of strut/shock/springs?
i do that speed everyday, stock suspension with 80,000 miles (128,750km) on them. (upper strut brace, rear sway bar have no effect on straight line) feels comfortable all the way to 112mph. (180kmh)

Not sayng its uncomfortable.The car stays true as in zero pull.No vibrations.

New Tires are on correct with new KYB shocks.

I ckecked pressure cold last night 32 all round.These are not super sticky tire and many use this exact tire and are pleased as am I.

Perhaps Iam just not used to the yaris at higher speed?

The car drives absolutely firm amd feels really responsive.Really,really impressed overall.Drives nicer then a new fit and civic si which are both 2016 and I have driven both.

The civic feels like a boat and the fit just feels cheapish,kind of like a chevette,pontiac acadian or escort I once owned.

Could a bad stabilizer bar(One that connects to front shock absorber) cause issues like I described.

I think that is rattling.

I have new cv drive shaft going in this weeekend due to torn boot so i will have mechanic give it a thorough go over.

[Pinchlite]

The information I provided was when my '07 was new and I was experimenting with tyre tread patterns and tyre pressure.



Here's recommended tyre pressures for the Yaris: http://blog.toyota.co.uk/toyota-tyre-pressure-and-size-guide#Yaris

Tyre Pressure:

14-inch wheels (175/70/14): The front tyres should be inflated to 36 psi. The rear tyres should be inflated to 35 psi.

15-inch wheels (175/65/15; 185/60/15): The front tyres should be inflated to a minimum of 33 psi and to a maximum of 36 psi. The rear tyres should be inflated to a minimum of 32 psi and to a maximum of 35 psi.

16-inch wheels (195/50/16; 205/50/16): The front tyres should be inflated to 32 psi for speeds below 99mph and 35 for speeds above. The rear tyres should be inflated to 29 psi for speeds below 99mph and 30 for speeds above.

Not sayng its uncomfortable.The car stays true as in zero pull.No vibrations.

New Tires are on correct with new KYB shocks.

I ckecked pressure cold last night 32 all round.These are not super sticky tire and many use this exact tire and are pleased as am I.

Perhaps Iam just not used to the yaris at higher speed?

The car drives absolutely firm amd feels really responsive.Really,really impressed overall.Drives nicer then a new fit and civic si which are both 2016 and I have driven both.

The civic feels like a boat and the fit just feels cheapish,kind of like a chevette,pontiac acadian or escort I once owned.

Could a bad stabilizer bar(One that connects to front shock absorber) cause issues like I described.

I think that is rattling.

I have new cv drive shaft going in this weeekend due to torn boot so i will have mechanic give it a thorough go over.

[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

[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.

[kimona]

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]

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]

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

Google it or search this site!

[Check Tha Rook]

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]

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]

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]

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]

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?

Any pressure higher than that and the bride was too rigid

Next time try plying her with alcohol.

[kimona]

Next time try plying her with alcohol.

Thanks for the laugh!