BMW Acronyms
Teves MK60 Feature Descriptions I should be doing any number of things for my employer, but I think it'd be more fun to post here. The following is taken from what appears to be a BMW document, titled "E46 Traction and Stability Control Systems". I'm posting it here because there are so many damn features in the Mk60 system that the acronyms become annoying. https://cimg0.ibsrv.net/gimg/www.mia...41c47f838b.png The Teves MK60 system is designed to maintain the vehicles stability during:
Corner Brake Control (CBC) CBC can occur if the vehicle is cornering and ABS regulation is not taking place. If the control unit detects transverse acceleration in excess of 0.6g and the brakes are applied, CBC prevents a build up in brake pressure to the inside rear wheel. This prevents the vehicle from entering into an unstable situation that can lead to Oversteer. The MK60 accomplishes this by closing the Inlet Valve, thus not allowing brake pressure to increase at the brake caliper. The difference in braking force between the two rear wheels creates a yaw force that opposes the oversteer and allows the vehicle to handle neutrally. Electronic Brake Force Distribution (EBV) EBV will adjust brake pressure to the rear axle based on the rate of slow-down of the rear wheels, ensuring even brake force between the front and the rear of the vehicle. The control unit monitors the wheel speed when the brakes are applied and compares the deceleration of the front and rear axle to determine required regulation. If the vehicle is moderately to fully loaded, the rear axle will take longer to slow down, rear wheel brakes can then be applied at a higher pressure . If a vehicle was lightly loaded, a similar brake pressure would be too great and result in an unstable situation. I think it's worth noting here that EBV does not substitute for static brake proportioning on the BMW. In the BMW master cylinder, there are two different sized pistons (to my knowledge). So the proportioning is done inside the master, before the pressure sensors. I've put included a brake proportioning valve placed before the pressure sensors for this reason. Some other relevant gems from this document: The brake fluid level switch is incorporated into the cap. The switch is a reed contact switch. If the brake fluid is at a sufficient level, the switch is closed and switched to ground. If the fluid level drops below a specified level , the reed contacts open and the MK 60 responds by switching off the ASC/DSC functions. Normal braking and ABS operation is unaffected. Brake Pressure Sensors The sensor provides the control unit with an analog signal proportional to brake pressure. Voltage increases with increasing brake pressure. Plausibility with BLS (brake light switch) The signal input from the brake light switch is compared with the pressure sensor values. The pressure sensors must not detect more than 5 bar when the BLS is not actuated. Both signals are used to form a redundant BLS input which is constantly monitored.
Originally Posted by 3DMMotorsports
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.
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Engine Bay Plumbing
I'm done plumbing the system and actually have the car running and driving and stopping. I have not been able to really test the ABS function... I chose to put everything on the driver's side, where the stock intake sat. In the "E46 Traction and Stability Control Systems" document, it says: The pre-charge pump used on previous systems is no longer required. Rapid pressure build up is possible because of the close proximity of the hydraulic unit to the master cylinder and improvements in the design of the return pump. This seems like a fine reason to keep the run between the master and the hydraulic unit. This also reduces the number of tubes crossing over the transmission - I only used the existing stock lines. The E46s I found in the junk yard mount the MK60 at an angle. Maybe it's a good way to angle the ports so there's always somewhere for air bubbles to travel upwards and out of the unit. I went ahead and mounted the unit at a similar angle. https://cimg2.ibsrv.net/gimg/www.mia...8d4240b254.jpg I mounted the BrakeQuip tees to a piece of bent aluminum to keep them from flopping all over the place. I placed the pressure sensors at the bottom of the tee so that air bubbles don't get trapped in the sensor. I'm hoping it also serves as a shield against heat from the header - apparently these sensors don't like excess heat. The Wilwood prop valve fits nicely underneath the master here. https://cimg4.ibsrv.net/gimg/www.mia...f9298e885e.jpg I mounted the OBD port I pulled off a junker near the hydraulic unit. It wasn't the greatest idea as the BMW procedure for bleeding the pressure requires you to both use the PC software and press the pedal. The cable I used wasn't long enough to reach, so I had to dig out an old USB extender. Not a big deal, but don't make this mistake. https://cimg7.ibsrv.net/gimg/www.mia...2b5fa9e929.jpg I've now lost the ability to organize thoughts into a cogent post. More later. |
Initial Results (Anecdotal)
I freaking love this system. I took it out at Thunderhill West for a track day with TrackTime (who I think ran a great day). It was six 20-minute sessions on the 2-mile track. I was in the Advanced group with a bunch of faster cars, so I had no one holding me back. I have stock 1.8 brakes with GLock R10 fronts and R8 rears. I did two sessions on older 205 RE-71Rs on 15x7s and the other four on brand new 225 RS4s on 15x9s. I didn't futz with the ABS module at all. Observations:
I didn't get my data capture set up for this event, but based on the fact I'm nowhere near as good a driver as most of you on here, I'm driving a non-turbo Miata on FM Foxes instead of the requisite Xidas, and my car setup is probably lacking, what data would you find helpful for me to capture the next time I'm out? |
After hearing your observations, i'm beginning to wonder how much an improvement this system is over the NB2 ABS. Does anyone have any thoughts on this? The NB2 system is way easier to retrofit, cheaper, and if only marginally less performance, im not sure this is worth the $ and effort.
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Originally Posted by George Washington
(Post 1573098)
After hearing your observations, i'm beginning to wonder how much an improvement this system is over the NB2 ABS. Does anyone have any thoughts on this? The NB2 system is way easier to retrofit, cheaper, and if only marginally less performance, im not sure this is worth the $ and effort.
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Originally Posted by fmcokc
(Post 1573686)
No Comparison, you will throw rocks at the NB2 system once you have driven both.
--Ian |
Does anyone know of a solution to convert the active BMW sensor signal into a passive type? I've seen things to do the opposite but not for this. I have a Race Logic TC which uses passive sensors so I'm trying to find a way to use the BMW sensors with it. Otherwise I guess I'll have to go NB2 if I want to stick with the RLTC.
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At a track day, looking for some input. I keep getting a 5E24 code, “Pressure Sensor 1/2 Not Plausible”. I clear it and it comes back the next session. Anyone have a clue on what to look at? Thanks in advance.
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Originally Posted by thebeerbaron
(Post 1565107)
Medium - "Receptacle, 1.5mm". These are female contacts used in the large 47-pin connector for the control module. The TE part number I used is 1355556-1. I bought mine from Mouser - $0.129 each.
Seals - For the small and medium connectors, I used TE part number 967067-1. They worked OK, not great. I think the issue was my crimping. I do not have the proper tool (see below). I bought mine from Mouser - $0.146 each. The proper TE contact to accommodate the seal is part number 1241603-1 The TE part number for the seals are: For 22awg wires 967067-2 (yellow color) For 18-20awg wires 967067-1 (green color) Blanking seal: 967056-1 (blue color) |
Originally Posted by druz
(Post 1573749)
Does anyone know of a solution to convert the active BMW sensor signal into a passive type? I've seen things to do the opposite but not for this. I have a Race Logic TC which uses passive sensors so I'm trying to find a way to use the BMW sensors with it. Otherwise I guess I'll have to go NB2 if I want to stick with the RLTC.
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Originally Posted by j_man
(Post 1598328)
The seals didn't work great for the 47pin plug because you used the wrong MQS contacts. 1355556-1 is to be used without those seals.
The proper TE contact to accommodate the seal is part number 1241603-1 The TE part number for the seals are: For 22awg wires 967067-2 (yellow color) For 18-20awg wires 967067-1 (green color) Blanking seal: 967056-1 (blue color) |
Originally Posted by j_man
(Post 1598329)
The ABS pump has outputs for the 4 wheels (at least the MK60E5 one has) but the case should be the same with the MK60. The ABS unit grounds the output on every tooth pulse, so you use a pullup resistor to either 5V or 12V (or any other) to generate a square wave amplitude what your Race Logic TC expects to see
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Originally Posted by fmcokc
(Post 1598345)
Thank you for that. I was just wondering the other day what is the correct connector for seals because I got the same thing and notice if they were too short. Question for you though, What is a good tool to crimp the seal for that size? I have several tools with the circular crimp on them for seals but they were all too big for this one.
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Ok, here you go. A much more affordable crimper for occasional dealings with these contacts:
https://www.bmotorsports.com/shop/pr...roducts_id/364 |
Originally Posted by thebeerbaron
(Post 1545177)
If you've got a mill, why not just mill the rear mounts from stock? Maybe I'm just a nerd with a mini-mill, but that seems more straightforward to me.
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just to confirm. All the fittings are m10 x 1 inverted except the pump (m12 x 1 bubble)?
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Originally Posted by icantlearn
(Post 1599729)
just to confirm. All the fittings are m10 x 1 inverted except the pump (m12 x 1 bubble)?
All the Miata stuff is M10 inverted flare. The BMW stuff is either M10 bubble flare or M12 bubble flare. That includes the pressure sensors. |
Which m10 are bubble? I thought the pressure sensors screw into the BQ44 adapter?
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Originally Posted by icantlearn
(Post 1599732)
Which m10 are bubble? I thought the pressure sensors screw into the BQ44 adapter?
All the Miata stuff is M10 inverted flare. Regarding the mill work - I'm afraid I've got too many projects going on right now to help you out. You should see the lack of progress on my K-swap! |
Originally Posted by thebeerbaron
(Post 1599734)
I believe all four outputs from the ABS module are M10 bubble. The two inputs may be M12 bubble. That sounds right - I'm not in front of my car right now.
You also need to use long thread brake flare nuts in the module, the short ones run out of thread before the pipe seats, found this out the hard way. The pressure sensors use an M12x1 inverted flare and yes the BQ44 adaptor is the right one for this. https://cimg3.ibsrv.net/gimg/www.mia...65db747562.jpg https://cimg8.ibsrv.net/gimg/www.mia...d94252eed0.jpg https://cimg9.ibsrv.net/gimg/www.mia...d03a979c48.jpg https://cimg0.ibsrv.net/gimg/www.mia...c8796ce04b.jpg |
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