ABS Light coming on after changing wheels / tires
05-04-2024, 10:12 AM
#1
ABS Light coming on after changing wheels / tires It came on at highway speeds. I changed to Weld Wheels 18" front and rear.
285/30/18 Front
315/30/18 Rear
Is the difference in diameter here too great?
Anything I can do? I can't ignore the ABS light because Texas has safety inspections and this will cause me to fail.
285/30/18 Front
315/30/18 Rear
Is the difference in diameter here too great?
Anything I can do? I can't ignore the ABS light because Texas has safety inspections and this will cause me to fail.
05-06-2024, 10:49 AM
#2
Even if your ABS light was off, it will not work properly with mis-matched tires. (It would still be over-active.) So, that may be something that is more important to you.
I am not aware of a tuner who can customize the EBCM for staggered tires. Aside from customizing the EBCM for the wheel setup, I suppose one could custom-machine a new rear reluctor to the proper ratio, but doing that (and tearing the rear end apart) must be crazy expensive.
I am not aware of a tuner who can customize the EBCM for staggered tires. Aside from customizing the EBCM for the wheel setup, I suppose one could custom-machine a new rear reluctor to the proper ratio, but doing that (and tearing the rear end apart) must be crazy expensive.
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Need4Camaro (05-11-2024)
05-06-2024, 10:02 PM
#3
Even if your ABS light was off, it will not work properly with mis-matched tires. (It would still be over-active.) So, that may be something that is more important to you.
I am not aware of a tuner who can customize the EBCM for staggered tires. Aside from customizing the EBCM for the wheel setup, I suppose one could custom-machine a new rear reluctor to the proper ratio, but doing that (and tearing the rear end apart) must be crazy expensive.
I am not aware of a tuner who can customize the EBCM for staggered tires. Aside from customizing the EBCM for the wheel setup, I suppose one could custom-machine a new rear reluctor to the proper ratio, but doing that (and tearing the rear end apart) must be crazy expensive.
05-06-2024, 10:37 PM
#4
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Looks like it's about a .7" height difference between those two tire sizes...that's right on the border of what usually causes this issue (I used to have a spread of .3" and had no issues, and usually folks are OK up to about .5" - beyond that is questionable).
Why such a short front tire in the first place? That front tire is almost a full inch shorter than the stock tire height.
There are really only two options here:
- Ignore the light (I drive around in '70s cars without ABS all the time, I don't worry about it, but I don't ever drive them in bad weather). I know you mentioned having to pass an inspection, but you can do this by resetting the light and switching to an alternate set of better-matching junk wheels/tires just for the test (if driving to the test site is enough to set off the light). That is, assuming you can fit a cheap set of wheels over whatever brakes you might have.
- Change tire sizes. I would want a taller front tire anyway (in fact, even your rear tire is a bit shorter than stock), but I don't know the width of your wheels or if tires of the optimal size (within that width range) are manufactured in an 18".
Only other option I could think of would be what wssix99 mentioned above.
Why such a short front tire in the first place? That front tire is almost a full inch shorter than the stock tire height.
There are really only two options here:
- Ignore the light (I drive around in '70s cars without ABS all the time, I don't worry about it, but I don't ever drive them in bad weather). I know you mentioned having to pass an inspection, but you can do this by resetting the light and switching to an alternate set of better-matching junk wheels/tires just for the test (if driving to the test site is enough to set off the light). That is, assuming you can fit a cheap set of wheels over whatever brakes you might have.
- Change tire sizes. I would want a taller front tire anyway (in fact, even your rear tire is a bit shorter than stock), but I don't know the width of your wheels or if tires of the optimal size (within that width range) are manufactured in an 18".
Only other option I could think of would be what wssix99 mentioned above.
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Y2K_Frenzy (05-07-2024)
05-07-2024, 09:03 AM
#5
Looks like it's about a .7" height difference between those two tire sizes...that's right on the border of what usually causes this issue (I used to have a spread of .3" and had no issues, and usually folks are OK up to about .5" - beyond that is questionable).
Why such a short front tire in the first place? That front tire is almost a full inch shorter than the stock tire height.
There are really only two options here:
- Ignore the light (I drive around in '70s cars without ABS all the time, I don't worry about it, but I don't ever drive them in bad weather). I know you mentioned having to pass an inspection, but you can do this by resetting the light and switching to an alternate set of better-matching junk wheels/tires just for the test (if driving to the test site is enough to set off the light). That is, assuming you can fit a cheap set of wheels over whatever brakes you might have.
- Change tire sizes. I would want a taller front tire anyway (in fact, even your rear tire is a bit shorter than stock), but I don't know the width of your wheels or if tires of the optimal size (within that width range) are manufactured in an 18".
Only other option I could think of would be what wssix99 mentioned above.
Why such a short front tire in the first place? That front tire is almost a full inch shorter than the stock tire height.
There are really only two options here:
- Ignore the light (I drive around in '70s cars without ABS all the time, I don't worry about it, but I don't ever drive them in bad weather). I know you mentioned having to pass an inspection, but you can do this by resetting the light and switching to an alternate set of better-matching junk wheels/tires just for the test (if driving to the test site is enough to set off the light). That is, assuming you can fit a cheap set of wheels over whatever brakes you might have.
- Change tire sizes. I would want a taller front tire anyway (in fact, even your rear tire is a bit shorter than stock), but I don't know the width of your wheels or if tires of the optimal size (within that width range) are manufactured in an 18".
Only other option I could think of would be what wssix99 mentioned above.
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Need4Camaro (05-07-2024), Y2K_Frenzy (05-07-2024)
05-07-2024, 11:54 AM
#7
It came on at highway speeds. I changed to Weld Wheels 18" front and rear.
285/30/18 Front
315/30/18 Rear
Is the difference in diameter here too great?
Anything I can do? I can't ignore the ABS light because Texas has safety inspections and this will cause me to fail.
285/30/18 Front
315/30/18 Rear
Is the difference in diameter here too great?
Anything I can do? I can't ignore the ABS light because Texas has safety inspections and this will cause me to fail.
The following users liked this post:
Need4Camaro (05-07-2024)
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05-07-2024, 06:01 PM
#8
You need to answer the question for us as to if you want 100% perfect function of your ABS system. Is that important to you? Do you care if your ABS activates prematurely as you come to a stop? Do you care if your ABS activates late if you end up in a skid?
If you care about these things, then you need to match circumference of the tires or do some customized engineering for the car. You also got some advice in 2015 on getting the staggered look while matching tire size: https://ls1tech.com/forums/wheels-ti...-question.html
If you care about these things, then you need to match circumference of the tires or do some customized engineering for the car. You also got some advice in 2015 on getting the staggered look while matching tire size: https://ls1tech.com/forums/wheels-ti...-question.html
05-07-2024, 10:15 PM
#9
You need to answer the question for us as to if you want 100% perfect function of your ABS system. Is that important to you? Do you care if your ABS activates prematurely as you come to a stop? Do you care if your ABS activates late if you end up in a skid?
If you care about these things, then you need to match circumference of the tires or do some customized engineering for the car. You also got some advice in 2015 on getting the staggered look while matching tire size: https://ls1tech.com/forums/wheels-ti...-question.html
If you care about these things, then you need to match circumference of the tires or do some customized engineering for the car. You also got some advice in 2015 on getting the staggered look while matching tire size: https://ls1tech.com/forums/wheels-ti...-question.html
What’s the game plan for this thing? I have no experience with a dedicated road course race car or anything like that but I have had my fair share of “dual purpose vehicles” (meaning street use and off street use) from 4x4’s to sports cars and I’ve come to appreciate more sidewall than less within reason. Off road and straight line traction both benefit from a larger sidewall when you “air down” and I’ve never really had a reasonably sized sidewall per the application rolling over on itself while cornering to where I’d consider the handling crappy. I have had “short” sidewalls that gave a crappy ride and in the grand scheme of things the handling wasn’t improved enough to justify the harsh ride. Get some sidewall in your life. I’m not saying monster truck but not rubber band tires either.
Last edited by Y2K_Frenzy; 05-07-2024 at 11:18 PM.
05-08-2024, 01:29 AM
#10
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I have no experience with a dedicated road course race car or anything like that but I have had my fair share of “dual purpose vehicles” (meaning street use and off street use) from 4x4’s to sports cars and I’ve come to appreciate more sidewall than less within reason. Off road and straight line traction both benefit from a larger sidewall when you “air down” and I’ve never really had a reasonably sized sidewall per the application rolling over on itself while cornering to where I’d consider the handling crappy. I have had “short” sidewalls that gave a crappy ride and in the grand scheme of things the handling wasn’t improved enough to justify the harsh ride. Get some sidewall in your life. I’m not saying monster truck but not rubber band tires either.
I like the suggestion of moving to a 275/35/18 front tire. It's slightly taller than the rear (which isn't ideal), but it shouldn't be too noticeable with it being only a 0.14" difference in overall height. And that spread is well within the range that will be acceptable to the ABS system (again, I had a 0.32" difference and the ABS was totally unaffected). Or, if you want the same spread but favoring a taller rear tire, then consider going to a 265/35/18 front tire (if your front wheel can accept a tire as narrow as a 265mm - still not sure since I don't think you listed wheels specs). Any of these choices are still a bit shorter than stock (with a lot less sidewall as there was no factory 18" wheel option), but they are better than sticking with a 285/30/18 front tire IMO.
05-11-2024, 01:30 PM
#11
I think I will just upgrade the front tires..
I guess I thought I was finished with everything but I've got more to do. Always a work in progress.
Supercharger goes in this month though.. ..thats going to be a blast.
Admittedly I do love the stance of the car with it being so low and aggressive looking between the front and the rear, but its not very functional on the street as it is right now. I do wonder what would happen if I go the custom route when it comes to my ABS though..
I guess I should ask, without ABS, how likely is it that my wheels will lock up and skid if I slammed on the brakes suddenly? Driving around it didn't feel any different and I'm typically a very attentive driver, I can count the number of times I've slammed on my brakes in the matter of a year but I still don't want one of those times to end up costing me in an unexpected situation.
I guess I thought I was finished with everything but I've got more to do. Always a work in progress.
Supercharger goes in this month though.. ..thats going to be a blast.
Admittedly I do love the stance of the car with it being so low and aggressive looking between the front and the rear, but its not very functional on the street as it is right now. I do wonder what would happen if I go the custom route when it comes to my ABS though..
I guess I should ask, without ABS, how likely is it that my wheels will lock up and skid if I slammed on the brakes suddenly? Driving around it didn't feel any different and I'm typically a very attentive driver, I can count the number of times I've slammed on my brakes in the matter of a year but I still don't want one of those times to end up costing me in an unexpected situation.
05-12-2024, 08:41 AM
#12
The risk depends on how one uses the car and how often. A daily driver, driven in rain or snow should definitely have it. Even if one doesn't care about the car, there is a liability angle. If one were to get in a wreck and hurt someone else and they were to find that the ABS was defeated or not working, the owner of that car could get sued.