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ABS disabled

Old 08-27-2018, 10:55 AM
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I'm certain the ABS system will not work without CAN communications from either the stock ECU or a stand-alone. This is possible with MoTec and Adaptronic stand alones, although currently only one person has it working with MoTec to my knowledge, and Adaptronic only works with manual trans, no DSC ABS units currently.
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Old 08-27-2018, 11:28 AM
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Old 08-27-2018, 11:45 AM
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Originally Posted by heavy85 View Post
I donít want to modify the ABS in any way, just want it functional. To be clear there are no other modules on the car to interface with. Has anyone successfully run the factory RX8 ABS as a stand alone system and if so what does it take is the only question.
Do you have a facespace account? The "LS Powered RX8" group is a pretty good body of knowledge.
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Old 08-27-2018, 08:00 PM
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Originally Posted by Adax View Post
I'm certain the ABS system will not work without CAN communications from either the stock ECU or a stand-alone. This is possible with MoTec and Adaptronic stand alones, although currently only one person has it working with MoTec to my knowledge, and Adaptronic only works with manual trans, no DSC ABS units currently.
Well that really sucks. Any possibility one could wire in the stock ECU just enough to make the ABS work - power, ground, whatever wire that signals the ABS? Alternately has anyone found an aftermarket ABS to integrate with the Mazda speed sensors and such?
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Old 08-28-2018, 07:53 AM
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A lot of V8 swap guys do this.
They keep the RX-8 ECU in place to operate the OE dash and such. Many put the ESS tone wheel on the crank for RPM measurement to keep the factory EPS system running.
I know some other have tried to emulate the ECU's CAN signals with an Arduino or RPi but CAN messaging information is somewhat scant so not all functions can be emulated this way.

IIRC, Touge Factory near Chicago built an LSX RX-8 that looked and functioned nearly identical to stock. Jason Saini brought it out to an autocross event and I got a ride in it (total BEAST!). I don't know if it had functioning ABS (and Jason's a good enough driver that I couldn't tell) but I think it had functioning ABS. You might want to see if Touge Factory or Jason can/will do some consulting to get this issue solved.
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Old 08-28-2018, 01:00 PM
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We've gotten CAN functionality working through Megasquirt on the BMW, so I'm hoping we can get the same working on the RX-8. I would definitely not want to run a stock ECU...
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Old 11-01-2018, 08:14 AM
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Anybody try this setup?

Just bought an RX-8 for E Production in SCCA. I'm looking to loose weight and the harness is 28 pounds. This looks promising but I'm wondering if anybody has used it.

MAZDA RX8 BRAKE BIAS SERVO REPLACEMENT PEDAL BOX KIT Ė HYDRAULIC DUAL AP CYLINDER [KIT B

Thanks,

Steve
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Old 11-14-2018, 10:07 AM
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The easy button for ABS is just to convert the ABS module to one from a non-DSC car. Then you have standalone ABS that doesn't require the factory ECU.
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Old 11-14-2018, 10:51 AM
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Originally Posted by John V View Post
The easy button for ABS is just to convert the ABS module to one from a non-DSC car. Then you have standalone ABS that doesn't require the factory ECU.
is this a common swap? i many have to look into that.
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Old 11-14-2018, 10:55 AM
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Originally Posted by trackjunkie View Post
is this a common swap? i many have to look into that.
Probably not, but non-DSC cars are not exactly uncommon and it sure makes swapping different engines / engine management systems a lot easier than starting with a DSC car.
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Old 11-14-2018, 06:41 PM
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I put balance bar with dual masters on my old car (240Z) and after lots of tweaking, trying different pads, playing with master sizes, etc got it OK but never awesome and flatspotted a bunch of tires in the process. The RX8 ABS is magic in comparison. And the DSC to non DSC ABS swap is not a bolt-on. The modules are completely different in every way so make sure to source EVERYTHING from a donor - lines, electrical connector (will have to splice into harness), master cyl, mount, etc. But the non-DSC ABS will run standalone as thatís what I run.
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Old 11-15-2018, 08:21 AM
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that's some good info, thanks.
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Old 11-15-2018, 08:58 AM
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SCCA E Production rules

Unfortunately, the rule book does not allow ABS at all. I'll be the first one in and let everybody know how it works...I'll be at Hallet in Jennings OK the last weekend in March, then VIR the second weekend in April.

I think I may be the 1st to have an S-5 13b in an RX-8....If anybody knows anybody else, please let me know.

Thanks,

Steve
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Old 01-21-2019, 09:03 AM
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FWIW, I bought the COMPBRAKE setup out of England, $550 USD included shipping. It arrived within a week.

Won't be driving until late March but I will get back on quality of parts, installation notes, and on track performance.

Steve
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Old 01-21-2019, 12:14 PM
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I will be very interested to hear your thoughts. The ABS/EBD system in the RX-8 has a pretty terrible failure mode, but it's so magical under braking that I am loathe to remove it.
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Old 02-27-2019, 12:35 AM
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I tried running without ABS at thunderhill track and the rears would lock up before the front under heavy braking. I actually spun under braking. With the ABS back on and it was much better.
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