I have stock tires in front and BS in the rear. I have noticed my slip light is on sometime which I have never had before.

 

its highly possible, depends on the traction level of the two tires relative to each other

 

yes, it can cause your slip light to go on, sometimes even with VDC off. My buddies car has PS2's on the front and T1R's on the rear, it acts up quite a bit with VDC on when he's getting on it, it only goes off on the hardest turns when VDC is off though.
-GP-

 

Thats odd, i have had 2 different brands/types of tires twice on my car. One time i had BFG KDW 2 on the front and then the BFG DKW T/A KD i believe on the rear. Then i had BFG KDW 2 on the front and goodyear eagle f1 gs-d3 on the rear and never had a problem...

-sean

 

Those tires probably have similar levels of grip so you were fine, this only becomes an issue when the grip differences between the front and rear are different enought that the VDC thinks its slipping all the time

 

I would be inclined to think that maybe the different brands were not the same diameter as the originals which would throw the computer off. Those that have experienced the problem, are the sizes the exact same as stock?
check here, it will tell you if your different size is being read too fast or too slow by your computer. (sorry it's from a mazda site)
http://www.miata.net/garage/tirecalc.html

 

tire size usually isn't the issue, the VDC is pretty flexible with regards to tire size, it really just comes down to grip level, and some tires just don't match up causing the problem

 

on my other car I have 2 different brands and the vdc
acts crazy

 

I dont see how there are different levels of grip really...i would say that as long as your running the same tire sizes as OEM you will be fine. My KDW 2 and my KDW T/A KD tires had no were near the same amount of tread as one another. One is a ultra high performance summer tire and the other is a extreme performance summer tire. I dont know why the car would think its slipping unless the tires are in fact actually slipping...?

-Sean

EDIT: Im just going off experience, not saying your wrong redlude so dont flip one...just off of experience.

 

I know we've been responding to the same threads, and if you take my replies as flipping on you, my bad, it wasn't meant in that way , and like you said, it shouldn't be a problem, and in most cases it won't be, but in certain situations with tires that vary enough it may be. Something is causing the problem, and I don't see any other likely culprits, and its not the first time its happened so that would be my best guess

 

i agree as well, most likely it is because of his tires i doubt it would be anything else as well. That sucks if it is because of that! New tires *credit car swiping noise*

 

lets not even get into that

 

I've run several different front/rear setups on this car, and no VDC issues regardless of aggressiveness or weather. I think tire size will have more to do with that than the grip levels. I've run such combos as 555/RE050A, KDW2/S-03 , KDW2/T1R, and 555/T1R on this car w/ no issues whatsoever. All were 245/35/19 & 275/35/19 combos.

 

people have run nonstaggered setups as well without problems, so I'm not sure of why that would be the issue

 

i think what redlude is referring to is the treadwear of the tire... the lower the number usually means better grip with less tire life/higher treadwear means less grip but longer tire life... so if you've got your toyo proxies 4(treadwear 300) up front and toyo t1r back... ur front wont grip as well when accelerating fast causing the slip light to turn on.. or if its vice versa and t1r's are up front... on a fast turn, you might get more back spin.


edit: just examples.. not necessarily your situation