RickyLee

so i went to alignment shop today....
and this is the result..(PIC)below
http://postimage.org/image/lqvy4ozsn/
mechanic test drove it he said "pretty straight" NOT! when i accelerate over 45+ mph i felt my car was pulling right and it pulls left when decelerate
tire pressures are even, tire wear? i dont see much of wears n i know it wont really effect much.. unless i have 20% meat on my tire which is not the case.
i spent $80 they couldnt fix it?
could it be something to do with chassis subframe or control arm?
left and right SAI and included angle are really uneven..

does anyone have clue?

Tein CM RS
18" wheel F/R
staggered tires

cdelena

Did it do it before the alignment? The rear camber seems a bit much and I know a touch of equal toe-in is needed but I have no experience with 18's and their behavior.

Different diameter rear tires will cause that problem you are describing which is why matched tires and inflation are so important.

har-vey

are the tyres the same all round. when i bought mine it was like this and when i got the new rubber on it all went away

Billman250

Its the tires. The alignment likely amplified it.

Rear tire brand, size, age, pressure, and wear must be an exact match.

To prove it, simply swap the rear tires left to right, and see if the pull changes direction.

billios996

This will seem like a dumb question, are you driving on a flat road? Crowns and ruts will pull wide tires all over the place. Aggressive alignments and mismatched tires will aggravate it too.

Has the car ever been hit or have you hit a curb?

BEASTMODE

Do this. I had an this problem and swapping rear tires proved it was the tires. In my case, I had a new defective tire.

thomsbrain

I have had defective new tires that caused this exact behavior. Tire Rack exchanged one after I measured them and found a 1/4" difference in circumferance between the two brand-new Dunlops. The problem got better with the replacement but was still slightly present. I chose to live with it since it was close to perfect by that point and I go through tires fast and change my diff oil frequently regardless.

Like you, I checked and re-checked my tire pressure about 30 million times and had the car aligned before pulling the rear wheels to measure the tires and discovering the real problem.

Billman250

All modern tires have a date imprinted on them, on one side of the tirte only, in the form of a 4 digit number.

examples: number 2012 means your tires were made in the 20th week of 2012. 5011 means they were made in the 50th week of 2011. etc...

I recommend anyone purchasing new tires to make sure you have matching dates, or the traction can differ.