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      MK60 Standalone ABS FAQs

      Which ABS unit do I need?
      There are two variants of MK60 units that were fitted to the E46 M3 that can be used with our standalone harness. Part number 34512282558 (units fitted to 2003-2006 M3’s EXCEPT ZCP and CSL models) and 34512282421 (for the ZCP/CSL package cars).

      I’ve heard some MK60’s can be re-programmed, is that true?
      People can be talking about one of two things. Any E46 M3 MK60 unit can be recalibrated to match the CSL parameters and that is a service we offer <link here>. There are also a subset of MK60 units that can be used for Race ABS applications which requires a bench flash of a map specifically set to your chassis. Any ZCP/CSL unit can accept the Race ABS programming and any E46 M3 MK60 who’s computer number ends in 813.3 can also. Please see below how to tell the difference and note that BMW does not consider the 818.3 and 813.3 units to be different part numbers. So you’ll need to see the exact unit you’re buying to be sure.

      What does the CSL programming do?
      The CSL programming raises the slip and yaw thresholds about the stock programming. It also adds M-Track mode for users with an E46 M3 without the ZCP package.

      What is a Race mapped ABS?
      The Race ABS is a motorsport level ABS solution. A custom map is built around approximately 20 chassis parameters from YOUR CAR and turns the ABS unit into a threshold braking assistant. Once ABS regulation is engaged the system will hold your tires at the limit of grip much more efficiently than a human can because the system can sense slip and control the calipers independently. Please contact us for more information.

      How do I source an ABS unit?
      The best source for these are car breakers such as MParts Worldwide among others. eBay is the best place to start looking. Searching the part number or terms such as “E46 M3 ABS” or similar will return the units. But be sure to check part numbers as some parts suppliers are not always sure what they have.

      Are used ABS pumps reliable?
      Short answer: yes!

      Long answer: as with any used part you need to use caution and look at what you’re buying. But unless there are obvious signs of water damage or the computer unit is broken it should give you years of reliable service. Some rusting around the black cylinder on the pressure block (which is the pump drive) is typical. Brake fluid sometimes drips down from the master cylinder during brake services and brake fluid causes the rust.
      We’ve handled a lot of these units and failures are extremely uncommon.

      How close do the E46 wheel speed sensors need to be to the trigger wheel?
      Recommended air gap between the sensor and the trigger wheel is 1.0-1.5mm (0.040”-0.060”).

      How many teeth does my trigger wheel need to work with the MK60 sensors?
      The E46 (and most other BMW’s) use a 48 tooth wheel. However we’ve used other tone rings with anywhere from 40-50 teeth. So long as all 4 wheels have the same tooth count the system will work properly.

      The BMW sensors don’t fit my applications, what else can I use?
      We’ve confirmed system compatibility with a wide variety of other OEM sensors. These include:
      • Corvette C6 and newer (any with yellow sleeve over sensor wires)
      • Nissan 350Z & 370Z
      • Ford Mustang 2015+
      • Bosch DF11 sensors
      • Honda S2000 (AP2)
      • Most modern sensors are going to work just fine

      How does your custom harness option work?
      When you select a custom harness we will ask you to provide lengths to each wheel speed sensor from your MK60 ABS unit along with an indication of what sensor you’ll be using. The pressure sensor runs will be 36”, power and ground will be 36”, and the yaw sensor will be 72”.

      MK60 Standalone ABS Installation

      INSTALLATION GUIDELINES
      The MK60 can be fitted in a wide variety of cars both BMW and otherwise. Depending on your application, some wiring and plumbing is required but with the use of a standalone ABS wiring harness the installation can be streamlined. The key items required for installation are:

      • Wheel speed sensors (one per wheel)
      • Pressure sensors (measuring master cylinder outlet pressures for the front and rear outlets)
      • Yaw/Acceleration sensor
      • Signal to the ABS system that the brake pedal is pressed (this is typically accomplished using whatever controls the brake lights)
      • 12v power
      • Ground

       


      INSTALLATION LOCATION

      When you order a custom harness we will ask you to provide lengths to each wheel speed sensor from your MK60 ABS unit along with an indication of what sensor you’ll be using. The pressure sensor runs will be 36”, power and ground will be 36”, and the yaw sensor will be 72”.

       

      Engine Compartment or Interior

      The MK60 uses on-board pumps and does not require a pre-charge pump to boost master cylinder line pressures. As a result the MK60 is very flexible with regards to installation location. It's not uncommon to see these units installed on the passenger side floor or even in the trunk of a race car. This can be advantageous to make room in the engine bay for engine swaps or to simplify wiring or plumbing.

       


      SENSORS

       

      Wheel Speed Sensors:
      The MK60 uses active wheel speed sensors (which is common on a majority of modern cars. This style sensor helps increase performance, durability and low speed accuracy and do not seem to have the false cycle problem like the passive sensors do. As a result the MK60 can be integrated into almost any car that is or can be fitted with active sensors. To date there's been proven results with BMW, Audi, and Nissan sensors.

      Pressure Sensors:

      Pressure sensor inputs as used by the MK60 to determine pedal input levels and driver intent. They are installed such as to monitor the master cylinder front and rear outlet pressure. They are not required for ABS regulation but provide performance advantages especially in cases when the suspension is being loaded or unloaded under braking.

      DSC / Yaw Sensor

      The DSC sensor (commonly, but incorrectly called the yaw sensor) is a combination of lateral acceleration and yaw/axial acceleration sensor. Similar to the pressure sensors, this sensor is not required for the ABS to function. However, it is strongly recommended especially in racing applications. Cars not equipped with the DSC sensor are more likely to experience Ice Mode where the wheels lock and ABS regulation stops. This is caused by the ABS computer not being able to distinguish what the chassis is doing (rotating vs going straight) without the input from the DSC sensor. What is "Ice Mode"? Ice mode is part of the ABS software that tries to interpret when the car is on ice and allows the system to lock the wheels which is the best way to stop in a no-traction situation. The ABS sometimes interprets wheel speed conditions during trail braking as the car being in a no-traction situation when it is not provided with DSC sensor data.


      WIRING

      The standalone harness has minimal additional wiring required but there are some items that have to be provided by the chassis.

      Power: The MK60 requires 3 power inputs. Two (2) 20 Amp inputs for the pump which should be constant when the ignition is on and one (1) 5 Amp input for the module which can be constant with ignition or switched to allow for turning the ABS system on and off. We offer a power harness accessory to aid in installation: MK60 Power Supply Sub Harness

      Ground: One ring terminal must be grounded to chassis ground.

      Brake Light Switch: The MK60 requires an input when the brake pedal is depressed. The wire that senses this needs to see a chassis ground when pedal is NOT pressed (Normally Closed) and open circuit when the pedal IS pressed. This can be accomplished a variety of ways. The most basic way is to use the brake light voltage to drive a Double Pole Double Throw (DPDT) relay. BMW offers a relay referred to commonly as the "Salmon Relay" (for it's color) that is perfect for this application.

      Malfunction Indicator Lamp: The MK60 has a dedicated Malfunction Indicator Lamp (MIL) wire. This light only illuminates when an ABS failure occurs which in standalone mode is limited to wheel speed sensor failures. The MIL light will not provide indication of DSC or pressure sensor failures since those only degrade (but don't disable) ABS regulation. 

      MK60 Data Acquisition Integration



      The MK60 is capable of providing data to external systems such as the AiM MXL series of data loggers, AiM EVO data loggers, MoTeC, etc. The Motorsport harness can be configured to offer a variety of outputs to suit the application.

      WHEEL SPEEDS
      The MK60 outputs conditioned digital wheel speed data in both 5v and 12v depending on configuration. 3DM and RHT have developed interface modules that can provide data with either reference voltage. This data can be useful for logging and also for standalone ECU's that provide traction control based on wheel speeds.

      BRAKE PRESSURES
      Using a breakout box 3DM and RHT can provide front and/or rear master cylinder output pressure data to your data logger device. We have developed custom sensor files for AiM use and can provide support for other data loggers as required.

      MIL OUTPUT
      Using a breakout box 3DM and RHT can provide indication of ABS fault/failure to your AiM dash. We have developed custom sensor files for AiM use with this output.

      CAN OUTPUT
      CAN stream output is currently under development.

      MK60 Standalone ABS Overview

       

      The MK60 Standalone ABS system by Racing Harness Technologies (RHT) is a bespoke made to order system. The system is designed to be as plug and play as possible but it does require some advanced mechanical understanding and skills. Depending on current order load, delivery time can be be between 6-8 weeks so please plan your project build accordingly. 

       


       

      OPERATING CONCEPTS

      The MK60 is unique among off the shelf ABS units (outside of high cost units from Bosch) in its ability to operate in a truly standalone mode. All of its sensor data is managed within the unit and its diagnostics are performed via a dedicated OBD2 port without the need for other gateway modules or the ECU like is the case with other modern systems. The MK60 is able to monitor its own sensors and regulate wheel slip without integrating into a car's existing electronics.

      Due to the onboard pumps in the MK60 there is no requirement for a pre-charge pump which are sometimes seen on other ABS systems (such as those on the pre-2003 E46 M3).

      3-CHANNEL VS 4-CHANNEL ABS

      4-channel ABS systems (like the MK60) regulate all 4 calipers independently from one another compared to earlier 3-channel ABS systems which regulated only the front calipers independently and linked the rears to a single outlet. This is particularly important in cases of trail braking and corner exit where 3-channel systems can causes issues when trying to regulate slip on one rear wheel and disturb both. 

       

       


       

      FREQUENTLY ASKED QUESTIONS

       

      The MK60 is both simple and yet complex at the same time. We have assembled a list of FAQs to help with the most common questions.

      View FAQs >>

       


       

      INSTALLATION

      The MK60 can be fitted in a wide variety of cars both BMW and otherwise. Depending on your application, some wiring and plumbing is required but with the use of a standalone ABS wiring harness the installation can be streamlined. The key items required for installation are:

      • Wheel speed sensors (one per wheel)
      • Pressure sensors (measuring master cylinder outlet pressures for the front and rear outlets)
      • Yaw/Acceleration sensor
      • Signal to the ABS system that the brake pedal is pressed (this is typically accomplished using whatever controls the brake lights)
      • 12v power
      • Ground

      When you order a custom harness we will ask you to provide lengths to each wheel speed sensor from your MK60 ABS unit along with an indication of what sensor you’ll be using. The pressure sensor runs will be 36”, power and ground will be 36”, and the yaw sensor will be 72”.

      Learn More about Installation >>

       


       

      DATA ACQUISITION INTEGRATION

       

       

      The MK60 is capable of providing data to external systems such as the AiM MXL series of data loggers, AiM EVO data loggers, MoTeC, etc. The Motorsport harness can be configured to offer a variety of outputs to suit the application.

      Learn More about Data Acquisition Integration >>

       


       

      RACE MAP PROGRAMMING

       

       



      The MK60 in it's base configuration offers exceptional ABS performance and has been proven to work on a wide variety of applications. The MK60 is used extensively in its base configuration on track cars equipped with high performance street tires and race cars running both DOT-R and full non-DOT slick tires.

      However, for users looking for professional motorsport level performance and fine tuned mapping the MK60 can be re-mapped with a TEVES/Conti race program. This map is developed around your specific chassis and takes into account parameters such as weight, track width, caliper piston size, etc.

      UPGRADE PATH
      Our general recommendation is for users to start with the base MK60 map and see if it fits your application. We can assist with sourcing a "map-able" MK60 so that you have the option to upgrade as desired.

      SOURCING THE RACE MAP
      3DM and RHT do not perform this remapping service. However, we are happy to connect our clients with a trusted vendor that does. Please email or call if this an upgrade you'd like to discuss.