2010 Prius II: Poor On-Center Steering

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Old 28 Sep 2010, 12:37 am   #1 (permalink)
Leftie
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Default 2010 Prius II: Poor On-Center Steering

We are used to cars that self-correct a bit to keep the wheels
pointed straight while driving on the highway, but our new Prius doesn't
seem to want to self-correct. It has the 15" wheels and OEM tires, 40psi
front, 38 rear. Is this normal, and can it be improved?
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Old 28 Sep 2010, 05:32 am   #2 (permalink)
Elmo P. Shagnasty
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Default Re: 2010 Prius II: Poor On-Center Steering

In article <6heoo.10992$nl4.2746@newsfe21.iad>, Leftie <No@Thanks.net>
wrote:

> We are used to cars that self-correct a bit to keep the wheels
> pointed straight while driving on the highway, but our new Prius doesn't
> seem to want to self-correct. It has the 15" wheels and OEM tires, 40psi
> front, 38 rear. Is this normal, and can it be improved?


I've been hearing this complaint since the car came out.
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Old 28 Sep 2010, 10:48 am   #3 (permalink)
Al Falfa
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Default Re: 2010 Prius II: Poor On-Center Steering


"Leftie" <No@Thanks.net> wrote in message
news:6heoo.10992$nl4.2746@newsfe21.iad...
> We are used to cars that self-correct a bit to keep the wheels pointed
> straight while driving on the highway, but our new Prius doesn't seem to
> want to self-correct. It has the 15" wheels and OEM tires, 40psi front, 38
> rear. Is this normal, and can it be improved?


I increased the pressure in my tires (42/40) to improve mileage without
seeing any measurable improvement. The ride got rougher and the steering
became overly sensitive. I'm going back to the the lower pressure Toyota
specifies.


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Old 28 Sep 2010, 11:25 am   #4 (permalink)
News
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Default Re: 2010 Prius II: Poor On-Center Steering

On 9/28/2010 11:48 AM, Al Falfa wrote:
>
> "Leftie" <No@Thanks.net> wrote in message
> news:6heoo.10992$nl4.2746@newsfe21.iad...
>> We are used to cars that self-correct a bit to keep the wheels pointed
>> straight while driving on the highway, but our new Prius doesn't seem
>> to want to self-correct. It has the 15" wheels and OEM tires, 40psi
>> front, 38 rear. Is this normal, and can it be improved?

>
> I increased the pressure in my tires (42/40) to improve mileage without
> seeing any measurable improvement. The ride got rougher and the steering
> became overly sensitive. I'm going back to the the lower pressure Toyota
> specifies.



What's the stock caster setting?
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Old 28 Sep 2010, 03:32 pm   #5 (permalink)
Leftie
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Default Re: 2010 Prius II: Poor On-Center Steering

Al Falfa wrote:
>
> "Leftie" <No@Thanks.net> wrote in message
> news:6heoo.10992$nl4.2746@newsfe21.iad...
>> We are used to cars that self-correct a bit to keep the wheels
>> pointed straight while driving on the highway, but our new Prius
>> doesn't seem to want to self-correct. It has the 15" wheels and OEM
>> tires, 40psi front, 38 rear. Is this normal, and can it be improved?

>
> I increased the pressure in my tires (42/40) to improve mileage without
> seeing any measurable improvement. The ride got rougher and the
> steering became overly sensitive. I'm going back to the the lower
> pressure Toyota specifies.
>
>


My fallback option is to go to 38/36 and see if that helps.
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Old 29 Sep 2010, 06:37 pm   #6 (permalink)
Al Falfa
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Default Re: 2010 Prius II: Poor On-Center Steering


"News" <News@Group.Name> wrote in message
news:fOCdne9XGI2Iij_RnZ2dnUVZ_hednZ2d@speakeasy.ne t...
> On 9/28/2010 11:48 AM, Al Falfa wrote:
>>
>> "Leftie" <No@Thanks.net> wrote in message
>> news:6heoo.10992$nl4.2746@newsfe21.iad...
>>> We are used to cars that self-correct a bit to keep the wheels pointed
>>> straight while driving on the highway, but our new Prius doesn't seem
>>> to want to self-correct. It has the 15" wheels and OEM tires, 40psi
>>> front, 38 rear. Is this normal, and can it be improved?

>>
>> I increased the pressure in my tires (42/40) to improve mileage without
>> seeing any measurable improvement. The ride got rougher and the steering
>> became overly sensitive. I'm going back to the the lower pressure Toyota
>> specifies.

>
>
> What's the stock caster setting?


You must be thinking of the Volt. I believe it has casters instead of
tires. :-)




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Old 29 Sep 2010, 10:40 pm   #7 (permalink)
Larry Van Wormer
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Default Re: 2010 Prius II: Poor On-Center Steering

A very good question, since the likely problem is insufficient caster
for good on-center feel. Wonder if it's usefully adjustable on the
Prius?

(I've found it very useful in the past to slightly increase caster
settings on the front suspension of a car, to help improve the
centering....)



On Sep 28, 9:25*am, News <N...@Group.Name> wrote:

>
> What's the stock caster setting?


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Old 30 Sep 2010, 09:08 am   #8 (permalink)
News
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Default Re: 2010 Prius II: Poor On-Center Steering

On 9/29/2010 11:40 PM, Larry Van Wormer wrote:
> A very good question, since the likely problem is insufficient caster
> for good on-center feel. Wonder if it's usefully adjustable on the
> Prius?
>
> (I've found it very useful in the past to slightly increase caster
> settings on the front suspension of a car, to help improve the
> centering....)
>
>
>
> On Sep 28, 9:25 am, News<N...@Group.Name> wrote:
>
>>
>> What's the stock caster setting?

>



Far more efficient than increasing toe-in scrub and drag.
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Old 30 Sep 2010, 10:32 am   #9 (permalink)
Al Falfa
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Default Re: 2010 Prius II: Poor On-Center Steering


"News" <News@Group.Name> wrote in message
news:n4WdncGEAeJLBDnRnZ2dnUVZ_iydnZ2d@speakeasy.ne t...
> On 9/29/2010 11:40 PM, Larry Van Wormer wrote:
>> A very good question, since the likely problem is insufficient caster
>> for good on-center feel. Wonder if it's usefully adjustable on the
>> Prius?
>>
>> (I've found it very useful in the past to slightly increase caster
>> settings on the front suspension of a car, to help improve the
>> centering....)
>>
>>
>>
>> On Sep 28, 9:25 am, News<N...@Group.Name> wrote:
>>
>>>
>>> What's the stock caster setting?

>>

>
>
> Far more efficient than increasing toe-in scrub and drag.


I don't understand the concern over the caster setting. If you go back in
this thread you will see the caster question was posed in response to this:

"I increased the pressure in my tires (42/40) to improve mileage without
seeing any measurable improvement. The ride got rougher and the steering
became overly sensitive. I'm going back to the the lower pressure Toyota
specifies."

I have since gone back to the recommended pressure which, in turn, restored
the ride and steering. In other words, the steering issue was solved by
simply restoring the tire pressure to Toyota's recommended level.




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Old 30 Sep 2010, 12:09 pm   #10 (permalink)
News
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Default Re: 2010 Prius II: Poor On-Center Steering

On 09/30/2010 11:32, Al Falfa wrote:
>
> "News" <News@Group.Name> wrote in message
> news:n4WdncGEAeJLBDnRnZ2dnUVZ_iydnZ2d@speakeasy.ne t...
>> On 9/29/2010 11:40 PM, Larry Van Wormer wrote:
>>> A very good question, since the likely problem is insufficient caster
>>> for good on-center feel. Wonder if it's usefully adjustable on the
>>> Prius?
>>>
>>> (I've found it very useful in the past to slightly increase caster
>>> settings on the front suspension of a car, to help improve the
>>> centering....)
>>>
>>>
>>>
>>> On Sep 28, 9:25 am, News<N...@Group.Name> wrote:
>>>
>>>>
>>>> What's the stock caster setting?
>>>

>>
>>
>> Far more efficient than increasing toe-in scrub and drag.

>
> I don't understand the concern over the caster setting. If you go back
> in this thread you will see the caster question was posed in response to
> this:
>
> "I increased the pressure in my tires (42/40) to improve mileage without
> seeing any measurable improvement. The ride got rougher and the steering
> became overly sensitive. I'm going back to the the lower pressure Toyota
> specifies."
>
> I have since gone back to the recommended pressure which, in turn,
> restored the ride and steering. In other words, the steering issue was
> solved by simply restoring the tire pressure to Toyota's recommended level.
>
>
>
>



The original question was posed by 'Leftie', who has not indicated a
solution:


Al Falfa wrote:
>
> "Leftie" <No@Thanks.net> wrote in message

news:6heoo.10992$nl4.2746@newsfe21.iad...
>> We are used to cars that self-correct a bit to keep the wheels

pointed straight while driving on the highway, but our new Prius doesn't
seem to want to self-correct. It has the 15" wheels and OEM tires, 40psi
front, 38 rear. Is this normal, and can it be improved?
>
> I increased the pressure in my tires (42/40) to improve mileage

without seeing any measurable improvement. The ride got rougher and the
steering became overly sensitive. I'm going back to the the lower
pressure Toyota specifies.
>
>


My fallback option is to go to 38/36 and see if that helps.
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