abs
- Thread starter korvette klown
- Start date
Most (older) GM ABS systems will disable if you pull the fuse or unplug the pack. Can't say for sure on a C4, but I'm pretty sure it's a kelsey hayes system, which disables with power loss. It's a safety feature so you at least have "normal" brakes when the ABS fails.
- Thread starter
- #3
under the storage box, right
Yep. I’ll look it up in my FSM tomorrow and see if it describes the “failure mode” of the unit.
By orange cone racing I assume you mean Autocross and I have competed at a high level in that and many other forms of racing.
I am trying to think of why you would want to disable ABS. Traction control yes, but ABS?
I am new to C4s so I don't have alot of practical experience but have done a fair bit of research as I'm currently building a C4 race car for the GTU series at the Area 27 track in Oliver, B.C. My research has not lead me to believe that I can do better than the computer.
Although I haven't raced a C4 in Autocross, I raced my 2015 C7 Z51 in A street class and managed several class wins and also overall FTDs in that car, and wouldn't dream of being able to modulate the brakes as well as ABS can. Even though the C4 system is vastly inferior to current day ABS I still think that it would likely be better than most humans. My C4 is a 1990 and I know that the ABS was slightly upgraded from the first version. I believe the system had another revision in 1992 and it's said that system was quite a bit better again.
If you feel that the ABS pulsing is making your stopping distance too long then back up your initial braking point so that ABS doesn't kick in or just barely starts. Take it from a notorious late braker, the amount of time you save with the perfect late braking manoeuvre is tiny compared with the amount of time lost if you brake too late. It's always better to enter a corner in a controlled and stable manner and be able to get the car rotated early, thus being able to get on the power earlier. In autocross racing this is especially important for heavy, high power cars, such as ours.
Looks like you have a 1989 and I'm not sure if that was the early version of ABS or if the 89 got the first revision. Anyway, if you are going to experiment with disabling ABS I would try to formulate a test where you try to threshold brake with, and without the system under the same conditions. One condition you should simulate would be hard braking then going into a turn right after, this is where on an autocross course you would often try trail braking as you turned in, without ABS this would be harder to accomplish on a regular basis without any lock ups.
If you do try this test let us know about your experience, would love to get some feedback on the subject.
I am trying to think of why you would want to disable ABS. Traction control yes, but ABS?
I am new to C4s so I don't have alot of practical experience but have done a fair bit of research as I'm currently building a C4 race car for the GTU series at the Area 27 track in Oliver, B.C. My research has not lead me to believe that I can do better than the computer.
Although I haven't raced a C4 in Autocross, I raced my 2015 C7 Z51 in A street class and managed several class wins and also overall FTDs in that car, and wouldn't dream of being able to modulate the brakes as well as ABS can. Even though the C4 system is vastly inferior to current day ABS I still think that it would likely be better than most humans. My C4 is a 1990 and I know that the ABS was slightly upgraded from the first version. I believe the system had another revision in 1992 and it's said that system was quite a bit better again.
If you feel that the ABS pulsing is making your stopping distance too long then back up your initial braking point so that ABS doesn't kick in or just barely starts. Take it from a notorious late braker, the amount of time you save with the perfect late braking manoeuvre is tiny compared with the amount of time lost if you brake too late. It's always better to enter a corner in a controlled and stable manner and be able to get the car rotated early, thus being able to get on the power earlier. In autocross racing this is especially important for heavy, high power cars, such as ours.
Looks like you have a 1989 and I'm not sure if that was the early version of ABS or if the 89 got the first revision. Anyway, if you are going to experiment with disabling ABS I would try to formulate a test where you try to threshold brake with, and without the system under the same conditions. One condition you should simulate would be hard braking then going into a turn right after, this is where on an autocross course you would often try trail braking as you turned in, without ABS this would be harder to accomplish on a regular basis without any lock ups.
If you do try this test let us know about your experience, would love to get some feedback on the subject.
