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bigger wheels and abs 

 

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 Post subject: bigger wheels and abs
Posted: Mon Feb 21, 2005 7:04 pm 
Parts Gopher
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i have a el ghia v8 and once borrowed wheels from mate which were 18 inch. looked good but the abs light kept comming on. and i think that when it comes on, they dont work. any1 with the same prob?
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Posted: Mon Feb 21, 2005 7:29 pm 
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Did you have all four wheels or only two ???? If the front wheels are a different outside diameter than the back it will assume one is slipping.

 

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Posted: Mon Feb 21, 2005 7:42 pm 
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raiki wrote:
Did you have all four wheels or only two ???? If the front wheels are a different outside diameter than the back it will assume one is slipping.


How? The abs works off of four rotating discs, one for each wheel, with notches cut in it. If one stops rotating, or slows faster than the others, it backs it off. Thats my understanding of it :?

 

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Posted: Mon Feb 21, 2005 8:10 pm 
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Andrew J wrote:
raiki wrote:
Did you have all four wheels or only two ???? If the front wheels are a different outside diameter than the back it will assume one is slipping.


How? The abs works off of four rotating discs, one for each wheel, with notches cut in it. If one stops rotating, or slows faster than the others, it backs it off. Thats my understanding of it :?

if the computer recognises wheels travelling at different speeds than the others, it will throw up errors

 

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Posted: Mon Feb 21, 2005 9:08 pm 
Getting Side Ways
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Andrew J wrote:
raiki wrote:
Did you have all four wheels or only two ???? If the front wheels are a different outside diameter than the back it will assume one is slipping.


How? The abs works off of four rotating discs, one for each wheel, with notches cut in it. If one stops rotating, or slows faster than the others, it backs it off. Thats my understanding of it :?


If two wheels of different diameter are travelling at the same speed, they are at different RPMs. This means on is partly locked (for ABS) or the other is slipping (traction control).

The clever ABS systems don't work only on locked wheels, its all about RPM differential.

 

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Posted: Mon Feb 21, 2005 9:49 pm 
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but remember that the ecu is always learning the different rate at which each will rotates, every time u turn on the ignition it will re-calerbrate, as tyers wear they change there diamiter but doesnt mean that the abs light comes on does it.

the abs will calculate the speed of each wheel and it determain when there is a slip rate between each wheel before its modulates the brakes.

so changing the tyre profile actaully doesnt effect the abs
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Posted: Mon Feb 21, 2005 11:09 pm 
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raiki wrote:
Andrew J wrote:
raiki wrote:
Did you have all four wheels or only two ???? If the front wheels are a different outside diameter than the back it will assume one is slipping.


How? The abs works off of four rotating discs, one for each wheel, with notches cut in it. If one stops rotating, or slows faster than the others, it backs it off. Thats my understanding of it :?


If two wheels of different diameter are travelling at the same speed, they are at different RPMs. This means on is partly locked (for ABS) or the other is slipping (traction control).

The clever ABS systems don't work only on locked wheels, its all about RPM differential.



Yeah, i see what youre getting at. I read it as different tyre width :D

So no confusion there

fordgt290 wrote:
ut remember that the ecu is always learning the different rate at which each will rotates, every time u turn on the ignition it will re-calerbrate, as tyers wear they change there diamiter but doesnt mean that the abs light comes on does it.

the abs will calculate the speed of each wheel and it determain when there is a slip rate between each wheel before its modulates the brakes.

so changing the tyre profile actaully doesnt effect the abs


They were talking about differences in profile between front and back, not all together :)

 

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