I DO NOT GET IT

[MARINE1991]

Originally Posted by gblaue

It's pretty simple, Stabili-Trac measures the rotational speed of each wheel. If any wheel speed is different, then it does what it is supposed to do, either save your butt or set of an error code. It sets the warning light if it can't correct the "improper measurement".The main thing is that you use the tire size calculator that was previously posted above and match the revolutions per mile between the front and rear tires.

I did already, should work as long as I can get the tire to fit since the car is lowered 1 inch already.. the calc does not take that into account...

[bmorecam]

WHAT DID YOU SAY???

[blazzin1]

MARINE1991, I think you're confusing people with the "stance" terminology. If you are trying to say that the factory OEM tires have a different height (front-to-rear) of 1.0", that is not true (at least not on an SS). The factory OEM rear tires are 275/40/20 (28.7" dia.), and the fronts are 245/45/20 (28.6" dia). That's a very negligable difference of 0.1". From my understanding, you upgraded your tires to Continental Extreme Contact DWS, correct? Your upgrades sizes are 295/40/20 (29.3" dia.) and 255/45/20 (29.0" dia.), is that correct? If this is correct, you shouldn't be having any problems with stabilitrak. In fact, this is the same sizes I was going to buy when I upgrade (if I stick with 20" rims). These upgraded tire sizes only have a 0.3" difference (I'm not sure where you got the 2" stance (rake) difference from), which "should" not affect stabilitrak. Tony (aka Nineball), and several others, have said that as long as the front-to-rear height difference is less than 0.5", there should be no problems. I guess maybe some cars are overly sensitive though, and some aren't, as I have seen quite a few people go with a front-to-rear height difference of much more than 0.5" and not have any lights at all. But this is the first I have ever heard of someone having lights with less than a 0.5" rake. Did you squeeze that 295/40/20 on the factory 9" wheel? If so, that might be part of the problem, that tire is recommended for 10-11.5" wheel only. Squeezing it on a wheel that is too narrow will make it taller in the middle. BTW, if your tire guy is getting a 265/45/20 for the front, is he switching brands? The DWS's are not made in that size!!! I don't think that is going to fix your problem either.

[Harleyfatboy]

Wrong size tires, wrong stance. What is so hard to understand. Your dealer was right even if you do not believe him. Some people are just weird.

[MARINE1991]

Originally Posted by blazzin1

MARINE1991, I think you're confusing people with the "stance" terminology. If you are trying to say that the factory OEM tires have a different height (front-to-rear) of 1.0", that is not true (at least not on an SS). The factory OEM rear tires are 275/40/20 (28.7" dia.), and the fronts are 245/45/20 (28.6" dia). That's a very negligable difference of 0.1". From my understanding, you upgraded your tires to Continental Extreme Contact DWS, correct? Your upgrades sizes are 295/40/20 (29.3" dia.) and 255/45/20 (29.0" dia.), is that correct? If this is correct, you shouldn't be having any problems with stabilitrak. In fact, this is the same sizes I was going to buy when I upgrade (if I stick with 20" rims). These upgraded tire sizes only have a 0.3" difference (I'm not sure where you got the 2" stance (rake) difference from), which "should" not affect stabilitrak. Tony (aka Nineball), and several others, have said that as long as the front-to-rear height difference is less than 0.5", there should be no problems. I guess maybe some cars are overly sensitive though, and some aren't, as I have seen quite a few people go with a front-to-rear height difference of much more than 0.5" and not have any lights at all. But this is the first I have ever heard of someone having lights with less than a 0.5" rake. Did you squeeze that 295/40/20 on the factory 9" wheel? If so, that might be part of the problem, that tire is recommended for 10-11.5" wheel only. Squeezing it on a wheel that is too narrow will make it taller in the middle. BTW, if your tire guy is getting a 265/45/20 for the front, is he switching brands? The DWS's are not made in that size!!! I don't think that is going to fix your problem either.

Well he did the calc after he called his tech guy up. and showed me the 2 inch difference and when he put in the bigger front tire it went down to less then 1. I do not have a clue when it comes to all this, that is why I called the dealer up and relied on the tire shop.. I had them put the OEM tires back on and it drives fine, put the new tires on the breaks start pulsating and all the lights come on.. so if the new bigger front tires do not fix it I will get a refund and order the OEM sizes, but the tire guy here told me it will fix it as long as there is no issues with rubing with the fronts. I am worried about that he said it will be fine. I did ask him if the 295 are too big for the rear and he said its fine...lol... I dont know.. he said was a legit size according to his computer, I told him to order the 285 just in case, which I need to call and make sure he did it, i know he order the bigger fronts.

[cab2g]

well I am glad you got it resolved. It is totally the tire guy's fault for not knowing that putting taller wheels in the back than in the front would cause traction control issues. It does make a lot of sense as others have said. If you have a tuner, they can definitely tune the car to handle the taller rear tires. But also in order to save money on a tune, you may just want to look into buying lowering springs for just the front and that will change the car's rake/stance to what you want to see.

[blazzin1]

Originally Posted by MARINE1991

Well he did the calc after he called his tech guy up. and showed me the 2 inch difference and when he put in the bigger front tire it went down to less then 1. I do not have a clue when it comes to all this, that is why I called the dealer up and relied on the tire shop.. I had them put the OEM tires back on and it drives fine, put the new tires on the breaks start pulsating and all the lights come on.. so if the new bigger front tires do not fix it I will get a refund and order the OEM sizes, but the tire guy here told me it will fix it as long as there is no issues with rubing with the fronts. I am worried about that he said it will be fine. I did ask him if the 295 are too big for the rear and he said its fine...lol... I dont know.. he said was a legit size according to his computer, I told him to order the 285 just in case, which I need to call and make sure he did it, i know he order the bigger fronts.

Well, I hate to say it, but I think your "tire guy" is on crack!!! He needs to study this for a while:
http://www.conti-online.com/generato...tasheet_en.pdf

It has all the available sizes and fitment data about the DWS tires. You know....if you're running the OEM wheels......they make the DWS in the OEM sizes!!! There, problem fixed!!! And I won't even charge you!!

[formare]

Personally - I think it was to much to expect. The techs and dealers are trained to repair and maintain the car as it was designed and built. I suppose the engineers that designed the cars might have been able to answer a question related to an alteration to the design; but asking the dealer to know is way outside of what they are reasonably expected to know.
Just my opinion....

Originally Posted by MARINE1991

Yea I think they should have been able to look it up and figured it out... Since it was a stability track issue, and let me know that if the stance is off more then 1 inch it will cause the lights to come on, I do not think that is too much to expect. yes I was asking for help, and not really bashing the dealership but companies in general when you do anything to there product they do not want to help out to figure out if its an issue with the car or the tire, instead of always getting the answer of it has to be OEM. I have voided my warrenty along time ago and I am fine with that, but is it too much to ask why the stability lights are coming on and ask for help??? maybe it is now a day's...

[MARINE1991]

Originally Posted by blazzin1

Well, I hate to say it, but I think your "tire guy" is on crack!!! He needs to study this for a while:
http://www.conti-online.com/generato...tasheet_en.pdf

It has all the available sizes and fitment data about the DWS tires. You know....if you're running the OEM wheels......they make the DWS in the OEM sizes!!! There, problem fixed!!! And I won't even charge you!!

I think you might be right... I do not know what he is smoking...

[MARINE1991]

Originally Posted by blazzin1

Well, I hate to say it, but I think your "tire guy" is on crack!!! He needs to study this for a while:
http://www.conti-online.com/generato...tasheet_en.pdf

It has all the available sizes and fitment data about the DWS tires. You know....if you're running the OEM wheels......they make the DWS in the OEM sizes!!! There, problem fixed!!! And I won't even charge you!!

I took a look at the PDF, and I am more lost now then ever.... I had the the rear on the rim at 295/40 or 30??/20 and its not even on the PDF. I am going to call him up and make sure he ordered the 285 rears like he said he was going to.

Thanks for all the help...

[ravensjeff]

I'm guessing here, but the 29.0" & 29.3" dimensions is NOT what to judge whether or not it exceeds rake/stance. It is 2 arbitrary points of the car- like the front bumper height to the rear bumper height (Another guess).

The difference in height between these 2 tires directly affect the front/rear bumper height, which affects stabilitrak, etc.

Where are all of the math majors!!!

I certainly would not be mad at the dealer for giving you a slight unclear, but correct answer. I know I was extremely anal about tire/rim size when I upgraded to Nitto tires and Forgeline rims. Your tire salesman dude maybe should have known- maybe.

[MARINE1991]

I am going to print all this off including Nineballs sticky and take it down there and talk to him again.. I wasted all day yesterday and still no new tires...

[MARINE1991]

Originally Posted by ravensjeff

I'm guessing here, but the 29.0" & 29.3" dimensions is NOT what to judge whether or not it exceeds rake/stance. It is 2 arbitrary points of the car- like the front bumper height to the rear bumper height (Another guess).

The difference in height between these 2 tires directly affect the front/rear bumper height, which affects stabilitrak, etc.

Where are all of the math majors!!!

I certainly would not be mad at the dealer for giving you a slight unclear, but correct answer. I know I was extremely anal about tire/rim size when I upgraded to Nitto tires and Forgeline rims. Your tire salesman dude maybe should have known- maybe.

Yea I agree with that as well..

[blazzin1]

Originally Posted by ravensjeff

I'm guessing here, but the 29.0" & 29.3" dimensions is NOT what to judge whether or not it exceeds rake/stance. It is 2 arbitrary points of the car- like the front bumper height to the rear bumper height (Another guess).

The difference in height between these 2 tires directly affect the front/rear bumper height, which affects stabilitrak, etc.

Where are all of the math majors!!!

I certainly would not be mad at the dealer for giving you a slight unclear, but correct answer. I know I was extremely anal about tire/rim size when I upgraded to Nitto tires and Forgeline rims. Your tire salesman dude maybe should have known- maybe.

No, you're right, those dimensions should not affect stabitrak (or maybe they do, I don't know). But they definitely will affect ABS, which is why his brakes are pulsating. The speed sensors will detect how fast the front and rear wheels are spinning and if there is a major difference, it will trigger ABS problems. So, the 29.3" and 29.0" diameters have to do more with the circumference of the tires (as it affects ABS).