BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      02-08-2019, 02:45 PM   #1
Thunderguts
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How does the E-diff get power?

How does the E-diff get pressure to apply brakes if I'm not applying any pressure via the pedal? I can't see anything special in the master cylinder. The only thing I can find is the DCS Hydro Unit. Does this have some kind of electric plunger in it to generate brake pressure? I'm no fan of electronic nannies and unfortunately the E82 has several. Ultimately I plan to get a mechanical LSD and code out DSC altogether. I just don't like the idea that a computer can freak out and lock up my brakes at any time. Mechanical failures happen, but they're rare without some kind of warning. BMW electronics definitely fall under the category "known unknowns." At least we don't have electronic steering. Nothing is more unnerving to me than a car that can steer itself.

Ah yes, after doing more research, the DCS Hydro Unit does have an electric pump in it to generate its own pressure. Fortunately our units don't seem to have the problems that earlier units had, but I still don't care for them.

Ugh! I seriously wish I had a standalone ECU so I could rip out every other computer and sensor in the car.

Last edited by Thunderguts; 02-08-2019 at 03:32 PM..
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      02-08-2019, 03:58 PM   #2
The Wind Breezes
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Don't fool yourself into thinking you know the car better than BMW. The people who design this stuff are very smart and you are 100 times more likely to have your ass saved by that stability control unit with full authority over your brakes than have it turn against you and kill you in what would be a pretty exceptional freak accident (or targeted act).

Besides, there's tons of other ways the car can kill you if electronics fail at the wrong time or someone puts malicious code somewhere. Run ABS pump (no brakes) kill power steering (after shutting down motor), kill power brakes, kill the motor, program transmission to downshift to first at 80mph on the highway. I'm sure that's just the tip of the iceberg, someone more creative than me can do better.
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      02-08-2019, 04:09 PM   #3
iminhell1
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Why did you buy a car with ABS then?
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      02-08-2019, 04:41 PM   #4
Thunderguts
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Quote:
Originally Posted by iminhell1 View Post
Why did you buy a car with ABS then?
I really wouldn't if it weren't federally mandated. Granted, I live in a place where rain falls maybe 30 days a year and snow comes once every three years. My 128i is extremely well balanced with a great suspension. Without all the electronics, it would also be around 2800 lbs and even more fun to drive. Granted a mechanical diff would add maybe 30 lbs to the rear, but without all the electronics, the battery could be half its size.

Maybe I'll win the lottery so I can afford a 2002 Turbo or a Hakosuka.
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      02-09-2019, 01:17 PM   #5
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The electronics are not what makes your car heavy. To save weight on the battery go LiFePO4. You can easily do less than half the stock weight.

ABS can of course be disabled / removed but don't worry about that for now.

Diff can be welded very inexpensively. I did mine and spent more money on the huge wrench to get the nut off the driveshaft than supplies to weld it. A shop can do this for low cost as well if you bring them the diff. If you don't have experience racing karts or something you will probably crash the welded diff car on the street, but it is ridiculously fun and highly recommended.


Things to remove which will save a lot of weight for little effort and cost, in no particular order:

--lithium battery
--rear trunk lining
--electronics in rear trunk
--all speakers
--all AC ducting on floor
--carpet, sound deadenging
--rear seat bottom and backs
--front passenger seat (and driver if you like discomfort of a non adjustable lightweight seat)
--sunroof
--door skins / window glass
--hood
--trunk
--fenders
--AC system including condenser
--Entire dash including HVAC blower system with heater and evaporator
--under hood tray and all windshield wiper hardware.

Lightweight wheels are good too but not for street use. Some of that stuff you would probably want to replace with a carbon or fiberglass panel. You can build those yourself. They sell fiberglass stuff at walmart and the auto parts store. Get to it and you may well end up with a badass car instead of a boring stock 128.
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