All Race Harness Technologies (RHT) MK60 products have moved to RHTmotorsport.com. For more information and to purchase MK60 products please contact Doug at info@RHTmotorsport.com
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”.