Will ABS still function if FD is using a race transmission?
#1
Full Member
Thread Starter
Will ABS still function if FD is using a race transmission?
I read over this:
https://www.rx7club.com/3rd-generati...rolled-978049/
I have:
* All wheel speed sensors install
* ABS computer
* ABS unit
What I don't have is:
* Speedo sensor on OEM transmission. I am running a dog box race transmission and thus my speed is calculated via aftermarket wheel speed sensors that feed into the Haltech ECU.
I am worried that my ABS unit is likely not functioning because it doesn't know the vehicle speed and only knows the speed of each wheel.
Thoughts?
https://www.rx7club.com/3rd-generati...rolled-978049/
I have:
* All wheel speed sensors install
* ABS computer
* ABS unit
What I don't have is:
* Speedo sensor on OEM transmission. I am running a dog box race transmission and thus my speed is calculated via aftermarket wheel speed sensors that feed into the Haltech ECU.
I am worried that my ABS unit is likely not functioning because it doesn't know the vehicle speed and only knows the speed of each wheel.
Thoughts?
#2
Full Member
Thread Starter
I posted the same question in the race race tech forum: https://www.rx7club.com/race-car-tec.../#post12572407
#5
Full Member
Thread Starter
Is the ABS warning light on?
.
.
Do you know if the oem abs needs vehicle speed input from the oem transmission to enable abs?
Thanks
#6
10000 RPM Lane
iTrader: (2)
Did some searching for you, this nice write up by arghx seems to indicate that vehicle speed is a parameter to determine how much slippage the ABS module should output to the hydraulic pump.
https://www.rx7club.com/3rd-generati...rolled-978049/
.
https://www.rx7club.com/3rd-generati...rolled-978049/
.
Last edited by TeamRX8; 08-17-23 at 08:03 PM.
#7
Full Member
Thread Starter
Thank you.
I linked that same post in my original post.
I think you are right. The vehicle speed is an input to abs and I believe this vss is the one connected to the transmission.
If true, I have a non functional abs since I have a Jerico race transmission.
I should then just delete abs and move on with life. I'll save weight and easier bleeding.
I linked that same post in my original post.
I think you are right. The vehicle speed is an input to abs and I believe this vss is the one connected to the transmission.
If true, I have a non functional abs since I have a Jerico race transmission.
I should then just delete abs and move on with life. I'll save weight and easier bleeding.
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#8
Arrogant Wankeler
Thank you.
I linked that same post in my original post.
I think you are right. The vehicle speed is an input to abs and I believe this vss is the one connected to the transmission.
If true, I have a non functional abs since I have a Jerico race transmission.
I should then just delete abs and move on with life. I'll save weight and easier bleeding.
I linked that same post in my original post.
I think you are right. The vehicle speed is an input to abs and I believe this vss is the one connected to the transmission.
If true, I have a non functional abs since I have a Jerico race transmission.
I should then just delete abs and move on with life. I'll save weight and easier bleeding.
Last edited by Slides; 08-18-23 at 08:51 AM.
#10
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you all fail, lol the 92-94 ABS uses the wheel sensors for speed. connection to the cluster is for the warning light
#11
Rotor or no motor
iTrader: (24)
you can use this diagram and stick a light bulb where it is supposed to go on the instrument cluster. This is what i did when i was diagnosing my ABS issue. or even better you can use this as an input on the IC7 Dash.
Also our systems are similar. but i feed the wheel speed through the front wheel speed sensor but nothing in the ABS unit .
My ABS issue ended up being the control unit.
Also our systems are similar. but i feed the wheel speed through the front wheel speed sensor but nothing in the ABS unit .
My ABS issue ended up being the control unit.
#13
Full Member
Thread Starter
Interesting! Good insights all. Ok, this is good news because I have yet to rip the system out. But, I was close. ha
Yes, as a next step, let me wire the ABS light into the ic7 as it would be good to know in general if I have an issue in the future.
I have a hypothesis about why my ABS is not working: I may have removed the ABS computer from the back of the car in the past without really knowing what it was. I probably thought "Why would anything important be back here? maybe this was for the radio system". lol
I need to figure out the harness connection and probably have to buy an ABS computer from EBay to get it back working.
Thanks all!
Yes, as a next step, let me wire the ABS light into the ic7 as it would be good to know in general if I have an issue in the future.
I have a hypothesis about why my ABS is not working: I may have removed the ABS computer from the back of the car in the past without really knowing what it was. I probably thought "Why would anything important be back here? maybe this was for the radio system". lol
I need to figure out the harness connection and probably have to buy an ABS computer from EBay to get it back working.
Thanks all!
#14
Full Member
Thread Starter
I have confirmed that my ABS computer is still installed. Phew.
Next up: I will be wiring the ABS light into the Haltech ic7 to see if it is complaining or not. Now that I think about it, before I switched over to the ic7, I had the OEM dash installed and the ABS light was not on. So, there is hope here folks!
I am building a power bleeder for my new Chase Bays manual brake master cylinder as I am having a hell of a time getting the ABS unit and everything else bled completely. Which is preventing me from trying to brake hard enough to activate ABS.
Stay tuned.
Next up: I will be wiring the ABS light into the Haltech ic7 to see if it is complaining or not. Now that I think about it, before I switched over to the ic7, I had the OEM dash installed and the ABS light was not on. So, there is hope here folks!
I am building a power bleeder for my new Chase Bays manual brake master cylinder as I am having a hell of a time getting the ABS unit and everything else bled completely. Which is preventing me from trying to brake hard enough to activate ABS.
Stay tuned.
#15
Rotor or no motor
iTrader: (24)
I have confirmed that my ABS computer is still installed. Phew.
Next up: I will be wiring the ABS light into the Haltech ic7 to see if it is complaining or not. Now that I think about it, before I switched over to the ic7, I had the OEM dash installed and the ABS light was not on. So, there is hope here folks!
I am building a power bleeder for my new Chase Bays manual brake master cylinder as I am having a hell of a time getting the ABS unit and everything else bled completely. Which is preventing me from trying to brake hard enough to activate ABS.
Stay tuned.
Next up: I will be wiring the ABS light into the Haltech ic7 to see if it is complaining or not. Now that I think about it, before I switched over to the ic7, I had the OEM dash installed and the ABS light was not on. So, there is hope here folks!
I am building a power bleeder for my new Chase Bays manual brake master cylinder as I am having a hell of a time getting the ABS unit and everything else bled completely. Which is preventing me from trying to brake hard enough to activate ABS.
Stay tuned.
#17
~17 MPG
iTrader: (2)
I have confirmed that my ABS computer is still installed. Phew.
I am building a power bleeder for my new Chase Bays manual brake master cylinder as I am having a hell of a time getting the ABS unit and everything else bled completely. Which is preventing me from trying to brake hard enough to activate ABS.
Stay tuned.
I am building a power bleeder for my new Chase Bays manual brake master cylinder as I am having a hell of a time getting the ABS unit and everything else bled completely. Which is preventing me from trying to brake hard enough to activate ABS.
Stay tuned.
#19
Full Member
Thread Starter
I just configured ABS is working! I got the Chase Bays manual brake master all bled and feels great. Easy to left foot brake.
For now, I have the high beam indicator set as the "abs error" light. I talked to Haltech this morning and they said a big software update is coming out that will allow me to change the entire setup and program any input to do whatever. I could have just flashed up a warning, but I did the high team icon for now since this is a race car and it is not street level.
Thanks everyone!
For now, I have the high beam indicator set as the "abs error" light. I talked to Haltech this morning and they said a big software update is coming out that will allow me to change the entire setup and program any input to do whatever. I could have just flashed up a warning, but I did the high team icon for now since this is a race car and it is not street level.
Thanks everyone!
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arghx (08-22-23)
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