OK so I purchased some 19's some time ago and couldnt get the car to ride like butter, balance, road force, hubcentrics etc. I have only recently started driving with VSA off and I have noticed quite honestly significant ride improvement, must be me but with VSA off there are no vibrations with my particular 19's while with it on their are some virbations I can definately feel. This all occurs anywhere in the 60-70mph area.

 

or maybe u think its smoother (mental thinking or something)
i only noticed a difference in power when VSA is off.....better response from pedal

 

Did putting the hub-centric rings help? I too have 19's and feel some vibrations. I'll try the VSA advice.

 

um ah.. no.

even my girlfriend complained when driving and she also noticed it.

 

Ravi, you said you noticed an increase pedal response with VSA off? A slight bit or a noticeable difference? Is there a reason why power increases with it off? Thanks!!

Joey

 

VSA stands for vehicle stability assist. it controls wheel spin so there is not much slipping to the side. in order to that, some engine power and brake pressure is controlled by VSA so you get good control and it doesn't go crazy.

someone will probably elaborate. i read this on a previous post pertaining to launching it w/ VSA off.

 

Read the manual, Dudes!!

 

im just trying to figure how does the VSA affect the suspension or makes it ride smoother

 

It doesn't. VSA only affects engine power output and braking. If it ever goes active, the indicator on the dash will turn on. Under normal driving it doesn't do anything.

 

 

I did. It mainly cautions you from driving with tires of varying sizes, like when you get a flat and use the donut spare, you should turn the VSA off. Likewise if you blew a tire and had to temporarily replace it with a different size.

If you replace your tires with larger tires, which have the same rolling radius and roatations per mile, it will not affect the VSA. I know the manual says "same size and type" but as long as you maintain the rotation per mile criteria, there should be no problem.

If there were, then multitudes of people who have done a +1 or even a +2 or +3 would have their VSA light on all of the time.

 

The question I asked is not covered in the manual, but thanks anyway.....dude

 

How does the engine know if the tires have a different rolling radius and therefore number of rotations per mile? And the answer cannot be GPS.

Mike

 

If its only 1 tire, it knows be because its different from the other 3 It uses the wheel speed sensors for the ABS system.

Actually, its unfortunate that the TL doesn't do a clever trick that my Olds Alero did -- if one wheel was rotating at a different speed, it activated a tire pressure alarm. All the information needed is there. This little trick saved me some grief 2 times.

 

That's a load of

With the A-Spec package the wheels are larger, yet there are no ECU or VSA modifications. Possibily if the rear tires were much larger than the fronts (or visa versa) it would cause a problem but that won't be the case.

 

As long as all 4 tires are the same size you will not have a problem. The VSA kicks in when one tires is moving at a different speed than the others, if they are different sizes the likely hood of the VSA engaging is greatly increased.

 

I understand that, and now that I re-read Ron's thread after getting some sleep I see that's exactly what he was saying too.

Well I guess that's my dumb question for the day.

Mike

 

hey I'm just stating my experience, as a result I drive mostly (weather permitting) with VSA off.

 

Why do you drive with the VSA off. There is no benifit to driving with it off except when you accelerating rapidly and could get some wheel slip. Other than that the VSA is passive. you could put 13's from a yugo on the car and the ride is going to be shitty but not cause of the VSA. Like the post below the only thing that matters as far as the VSA is conserned is the wheel speed sensors for the ABS. They measure rotation and how fast and then the computer decides what wheels need to brake what ones are skidding and how much gas to allow if you have the pedal mashed. This all happens before the PUCKER factor takes place.

 

AS i stated before and now aagain, its smoother and significantly less vibration with MY PARTICULAR application, thats why If its less virbation then Im driving with if off, is that ok with you?

 

If you get a vibration with the VSA on something is wrong with your car. A wheel speed sensor, yaw sensor, lateral g sensor, etc.

The VSA is a passive system and will have no affect on normal day to day driving in fair conditions.

If your car, and its VSA system, is in perfect condition... any "smoother" operation is a complete placebo effect.

 

I'll take my placebo causing non steering wheel shaking effect gladly with a smile.

With the VSA it shakes but just a little, done the back to back comparison enough I stop counting.

 

But with the A-spec Package the actual Tire is a thinner or low profile tire. Reading these forums people have said time and time again, that the final diameter of the wheel and tire is the same between the OEM Rims and the A-Spec Rims.

 

Which is how it should always be with plus size tires.

 

Would driving with VSA off improve the jerking on rough surfaces in curves?

 

No, VSA would actually save you (or attempt to save you) should that jerking be severe and cause you to spin the tail of the car out.

Upgrading to an aftermarket rear sway bar and/or upgrading the tires would help.

 

Let me make a point that I drove the car for about 1000 miles with the stock wheel/tire and the car didnt vibrate at all with the VSA on or off, so I dont believe there is something wrong with the car.

 

Didn't work for me...

 

just for kicks, put your stockers back on for a tank of gas, then let us know what happens.

 

you mean plus size wheels?