HUGE opportunity to laugh and call me stupid...
I dont think that is exactly true. The sensors measure the angular velocity of the wheel. In an extreme case, if the front tires had half the circumference of the rear tires, and the senso assumed that the tires were the same size, it would think that the front tires were moving forward at twice the speed of the rears, because it is spinning at twice the speed.
It seems to me that the system should be smart enough to measure the difference in circumference of the tires by assuming that the tires are generally covering the same distance and comparing their relative angular velocities. in a system like this, I could see how there would be a maximum difference in the tire sizes.
It seems to me that the system should be smart enough to measure the difference in circumference of the tires by assuming that the tires are generally covering the same distance and comparing their relative angular velocities. in a system like this, I could see how there would be a maximum difference in the tire sizes.
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From: Chicago, IL
Originally posted by zPilott
I dont think that is exactly true. The sensors measure the angular velocity of the wheel. In an extreme case, if the front tires had half the circumference of the rear tires, and the senso assumed that the tires were the same size, it would think that the front tires were moving forward at twice the speed of the rears, because it is spinning at twice the speed.
It seems to me that the system should be smart enough to measure the difference in circumference of the tires by assuming that the tires are generally covering the same distance and comparing their relative angular velocities. in a system like this, I could see how there would be a maximum difference in the tire sizes.
I dont think that is exactly true. The sensors measure the angular velocity of the wheel. In an extreme case, if the front tires had half the circumference of the rear tires, and the senso assumed that the tires were the same size, it would think that the front tires were moving forward at twice the speed of the rears, because it is spinning at twice the speed.
It seems to me that the system should be smart enough to measure the difference in circumference of the tires by assuming that the tires are generally covering the same distance and comparing their relative angular velocities. in a system like this, I could see how there would be a maximum difference in the tire sizes.
Hahahahahaa....you're stupid! 
Well, you asked for it.
I'm actually running snow tires that are 225/45 the whole way around on my enthusiast. My TCS kicks in much more easily than it does with the 235/50's out back. Under normal driving...not really a problem...which is what I do about 95% of the time in the winter months. When it's dry out, I have the TCS off anyway...so not an issue with winter tires overall. I feel your pain man...hopefully you can unload those things.
Good luck.
ps 225 tires out back is not a lot of rubber for a car with 300hp.
Well, you asked for it.I'm actually running snow tires that are 225/45 the whole way around on my enthusiast. My TCS kicks in much more easily than it does with the 235/50's out back. Under normal driving...not really a problem...which is what I do about 95% of the time in the winter months. When it's dry out, I have the TCS off anyway...so not an issue with winter tires overall. I feel your pain man...hopefully you can unload those things.
Good luck.
ps 225 tires out back is not a lot of rubber for a car with 300hp.
Originally posted by zPilott
I dont think that is exactly true. The sensors measure the angular velocity of the wheel. In an extreme case, if the front tires had half the circumference of the rear tires, and the senso assumed that the tires were the same size, it would think that the front tires were moving forward at twice the speed of the rears, because it is spinning at twice the speed.
It seems to me that the system should be smart enough to measure the difference in circumference of the tires by assuming that the tires are generally covering the same distance and comparing their relative angular velocities. in a system like this, I could see how there would be a maximum difference in the tire sizes.
I dont think that is exactly true. The sensors measure the angular velocity of the wheel. In an extreme case, if the front tires had half the circumference of the rear tires, and the senso assumed that the tires were the same size, it would think that the front tires were moving forward at twice the speed of the rears, because it is spinning at twice the speed.
It seems to me that the system should be smart enough to measure the difference in circumference of the tires by assuming that the tires are generally covering the same distance and comparing their relative angular velocities. in a system like this, I could see how there would be a maximum difference in the tire sizes.
Your TCS is kicking in probably because they are 225 and dont have the same traction as the 235 not because of diameter diffeences.
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Well, I just spent the last 20 minutes going through the service manual (not the owner's manual) and could not find any reference to this at all! Did anyone else find anything? My guess is that the TCS/VDC doesn't kick in until the angular velocity difference is probably about 10% vs the 1 or 2 percent people have been speculating on here.
Now, I also did a quick Yahoo search of "ABS+TIRE DIAMETER" and from what I read, if you were so far out of spec to cause a problem, you should actually get an ABS or TCS/VDC warning light. Otherwise I think this thing is getting all out of propotion.
Now, I also did a quick Yahoo search of "ABS+TIRE DIAMETER" and from what I read, if you were so far out of spec to cause a problem, you should actually get an ABS or TCS/VDC warning light. Otherwise I think this thing is getting all out of propotion.
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