Grifter
Well-Known LVC Member
can SLIGHTLY shorter or taller tires in the rear comapred to the fronts really freak out the ABS/TC system?
how sensitive is the ABS/traction control to tire sizes?
- Thread starter Grifter
- Start date
Grifter
Well-Known LVC Member
MrWilson said:
but there is when the wheel speed sensors dont read the same front to rear. thats how the traction control system works. i was just wondering what kind of tolerences there were in the system before it started causing problems..
1/2" tire hieght difference acceptable, 1"? etc..
Frat-man-du
Dedicated LVC Member
Grifter said:
My wife blew both rear tires - yes she backed up over a blow out strip -cleaning warning not to back up.
We put on two spare donuts (good samaritan felt sorry for my wife) and the ABS light came on after about 30 miles. ABS light was off when she picked up the car, after two new tires. Has not come back on - almost a year now.
Not sure if related, but that's my story and I'm stickin' to it!
M
my95mark8
Guest
I think that if the putting 2 different size wheels would cause the light to come on because the computer would see them as turning at different speeds.
Grifter
Well-Known LVC Member
MrWilson said:
thats great and all, but give us the important numbers too.. you just gave us the aspect ratio of the tire..
FWIW i'm running 275/40/17 rear, 245/45/17 front.
they should be the same height, but since they are different manufacturers, that doesnt mean they are.
and my question is concerning the part where, what if they arent the same hieght? how much tolerance is acceptable to the computers..
Moes8
Dedicated LVC Member
just an fyi,
t/c runs off both front and rear abs sensors,
think about it,if you have both rear tires spinning equally the system has to judge off the fronts too,otherwise the system would say,"well,everything looks peachy" and you would spin all day long
t/c runs off both front and rear abs sensors,
think about it,if you have both rear tires spinning equally the system has to judge off the fronts too,otherwise the system would say,"well,everything looks peachy" and you would spin all day long
dertyclown
Dedicated LVC Member
who need ABS or T/C
02LSE96LSC91SE84TC
Dedicated LVC Member
I ran different height tires on my Mark VII, didn't seem to make a differance, but it doesn't have traction control, only abs. My VIII I stuck with same size all around. Sorry it doesn't help much.
Grifter said:
Running 215/60-16's in the front & 225/60-16's in the rear no problem. Ran 235/60-16's in the rear for a while, no problem. The T/C will brake the spinning, loose, wheel up to thirty MPH to help get traction, braking a front wheel will not really accomplish anything. Believe you are all right in either case. Ed
Grifter
Well-Known LVC Member
would the tires being shorter than stock really throw off the system? all 4 are spinning faster than the computer thinks they should be, would that be an issue? i know people are running 245/45/17's...
I'm not sure but I do know the Gen 2 traction control is a lot more advanced than the Gen 1 system. I would like to know the answer to this as well since I have stock 225/60/16's all around right now and I would like to put 255/50/16's in the back...
Moes8
Dedicated LVC Member
this system still works with limited slip and what not,MrWilson said:
and trust me on even open rears can slip equally on snow and ice,
the real question none of us can answer so far is how far of a difference one can go in front to rear tire size before a problem occurs,there obviously is a room for difference in size i think,if there was no tolerance for different sizes the system would probably engage even when just making a left or righthand turn,as one tire would be turning faster/slower than the other(more proof the system reads the front abs sensors,as they will each be turning different speeds when cornering also.)
hopefully someone can answer this,but it might come down to trial and error.
nobodyspecial
Active LVC Member
95LSC32V said:
That would put the rolling difference at 2.2% different, I would seriously doubt the ABS/TC control system is programmed to react to such a small difference. Variations in tire size, tire pressures, etc can easily add up to that much. I would think that you would be ok up to a 4-5% difference. At least that is where I would put it if I designed it.
rmac694203
Dedicated LVC Member
There are plenty of people, including me, that have run slightly shorter tires with no problems. I don't know about the front and rear being different sizes though.
nobodyspecial
Active LVC Member
rmac694203 said:
Smaller or taller tires will have zero effect on ABS/traction control if they are the same size on all 4 corners. If is the difference between them as the sensors compare the fronts to the rears for t-c, as I wrote above, it probably needs at least a 4-5% difference in diameter (which means the same percentage in circumference) between the front and rears to throw the systems off.
ONEBADMK8
Dedicated LVC Member
NO differences whatsoever. I have 35's on the back and 40's on the front and I have been staggered for YEARS with nothing at all going hay wire.
These cars aren't that sensitive.
These cars aren't that sensitive.
Grifter
Well-Known LVC Member
ok. thats what i was thinking too, i couldnt see them being that sensitive, but then again i couldnt see someone in their right mind deciding that was a good place for an oil filter either..
check my other post, http://www.lincolnvscadillac.com/showthread.php?p=163827#post163827, thats what prompted this question..
check my other post, http://www.lincolnvscadillac.com/showthread.php?p=163827#post163827, thats what prompted this question..