2WD on Demand

"HFV has no HFV. But somehow has 2 motorcycles" (hondasfordsvolvo) 08/22/2019 at 15:44 • Filed to: None

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I’m scheming a bit lan to make my Xdrive have a Race Mode. 2wd, no abs, no traction control. All at the flip of one switch.many BMW owners myself included have had their stability control system fail entirely due to faulty wheel speed sensor. So basically I want to intentionally cause a fault.

My plan involves buying a wheel speed sensor, and hacking into it, putting a switch to disconnect the signal, or ground wire between the harness and the actual sensor. Thankfully the same sensor is used on nearly every BMW so the part is cheap.

It seems the installation of the part is pretty straightforward as well, I think I’d just have the switch in the glove box so I don’t have to cut a hole for it anywhere. The intent being that everything would be reversible.

What say you Oppo? Am I a stupid madman, or a good madman.

Also on an unrelated note today I saw a Polaris Sligshot with a rook age/roof, with a bike, and cargo box mounted to it, and it was towing a tiny camper. It was wild .

If only EssExTee could be so grossly incandescent > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 15:58

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How does a bad wheel speed sensor give you 2WD?

Highlander-Datsuns are Forever > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:00

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You could just unplug one of the wheel speed sensors and make sure it isn’t dangling around to get caught up in the brake or wheel. I know it’s very easy on my Mazda. 

TheTurbochargedSquirrel > If only EssExTee could be so grossly incandescent 08/22/2019 at 16:05

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Car doesn’t know how fast one of its wheels is going, can’t verify that fancy computer controlled AWD system is functioning correctly, assumes it isn’t, shuts off fancy computer controlled AWD system.

TheTurbochargedSquirrel > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:06

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Put the switch in line with the power or ground to the sensor. You can cause all kinds of signal integrity issues if you tap into the signal wire and then run it to somewhere else in the car.

dogisbadob > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:09

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Wait, it’s normally 3WD?

Oppenheimer - not missing my shitboxes anymore > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:09

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You’re a madman with good intentions.

What car is it for? I can think of many other modules that can complain and go to limp mode if this failure is detected. After all, it’s part of my job making sure those work properly.

HFV has no HFV. But somehow has 2 motorcycles > If only EssExTee could be so grossly incandescent 08/22/2019 at 16:11

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What the squirrel said.

Power to the front wheels is variable from 0-80% I think via a clutch pack in the transmission. Without the wheels speed sonor the stability control system doesn’t know what to do so it does nothing. That’s what everything shuts down, not just the AWD. 

I like cars: Jim Spanfeller is one ugly motherfucker > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:12

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I dunno if this is smart or not, but it is very Oppo. 

HFV has no HFV. But somehow has 2 motorcycles > Highlander-Datsuns are Forever 08/22/2019 at 16:13

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That would involve. At least getting out and crawling under the car. I want a “hey check this out, flip switch, do burnout” scenario 

HFV has no HFV. But somehow has 2 motorcycles > dogisbadob 08/22/2019 at 16:13

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Lol awd

HFV has no HFV. But somehow has 2 motorcycles > Oppenheimer - not missing my shitboxes anymore 08/22/2019 at 16:14

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2011 328i X drive. I put about 500 miles on mine when the stability control system was out. I’ve read of people going much longer without fixing it.   

vicali > TheTurbochargedSquirrel 08/22/2019 at 16:15

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Sounds a bit like the diff switch on auto 4EAT subarus; when you bypass the transmission sensor it went into error and the dif f locked at 50/50 F/ R . The error stayed until you restarted it. It had to have a specific resistance or it would go into full stumble mode.

That was 1998 and people were frying sensors.. It’s probably gotten more complicated 20 years later.

Oppenheimer - not missing my shitboxes anymore > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:15

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Then go for it. Really nice to have 2WD on demand!

HFV has no HFV. But somehow has 2 motorcycles > TheTurbochargedSquirrel 08/22/2019 at 16:16

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That what I was thinking. With Thin gauge wire, adding a few feet could alter the signal enough tot make a differencet

This is also why I want to get a spare part first so if I mess it up I can just put the original back in 

bob and john > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:16

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i’m just going to point out the plan here.

lets take 1 (one) expensive german AWD system
install item to remove a sensor
pray it works.


can we ...you know, think of the potential consequances?
as an idea, if a se ns or goes on my lex, EVERYTHING gets locked. torqe split is locked, the ABS turns off, VCS/ESP turns off, and EVERYTHING on the dash lights up. 

OPPOsaurus WRX > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:18

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sounds like a fun way to create a bunch of expensive electrical issues.

If only EssExTee could be so grossly incandescent > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:18

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Being the owner of a BMW, I'm very familiar with the impact of the sensor on the DSC system. I've never looked into how their AWD systems worked though. That's silly that it deactivates entirely.

HFV has no HFV. But somehow has 2 motorcycles > If only EssExTee could be so grossly incandescent 08/22/2019 at 16:20

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Silly but convenient. I want to believe that the engineers had people like me in mind. People who want AWD for snow, and RWD for every other instance. Like they wanted to offer this feature but it was rejected somewhere doesn’t the line 

Highlander-Datsuns are Forever > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:22

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No different that having to get out of the truck and lock the hubs for 4wd. 

Highlander-Datsuns are Forever > bob and john 08/22/2019 at 16:22

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Yeah, I’m typically not trying for more warning lights on the dash. 

HFV has no HFV. But somehow has 2 motorcycles > bob and john 08/22/2019 at 16:24

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It is smarter that the torque split locks on the Lexus. But gunner that it shuts off in the BMW.

I haven’t heard of any adverse effects from driving when the stability system goes into NOPE mode. Doesn’t mean there’s no risk tho

bob and john > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:28

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the lexus doesnt go full power to one end either. I think its variable between 25/75 and 50/50

HFV has no HFV. But somehow has 2 motorcycles > bob and john 08/22/2019 at 16:29

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Xdrive will disconnect the front wheels entirely in certain circumstances. I think anytime you’re cruising above 45 it shuts off for fuel economy 

TheTurbochargedSquirrel > vicali 08/22/2019 at 16:33

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Did that mod with my 2001 Outback. It drifted good in the winter with the 50/50 split and the factory rear LSD in that gen of Outback.

Nibby > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:34

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make it FWD

If only EssExTee could be so grossly incandescent > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:34

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I’d prefer it maybe go into a failsafe mode that locks in a  constant percentage to the front. Last thing I want is to not have AWD in the winter because a silly little sensor fails

dogisbadob > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:34

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oh oops!

You know, I only saw the mention of the Polaris Slingshot at the bottom and didn’t even notice you said it was for a BMW in the beginning

So I thought the Slingshot was AWD, which would be 3WD in that case!

Sorry

HFV has no HFV. But somehow has 2 motorcycles > Nibby 08/22/2019 at 16:51

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No

Tripper > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 16:53

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$20 says your car lights up like a Christmas tree if you do this. Hopefully it goes back when you undo it. My E90 needed coding just to “register” a new battery.

Not recommended in my unprofessional opinion. I am however interested to hear the outcome should you choose to move forward.

HFV has no HFV. But somehow has 2 motorcycles > Tripper 08/22/2019 at 16:58

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Oh yes many lights come on. ABS, DTC, 4x4. But once the problem is fixed they do go away on their own.

The codes do say as “stores codes” so if you check with a scan tool it’ll report that it had  the code.

Tripper > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 17:01

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Anything like VAGCOM for BMW? Might be able to code out the warning lights if there is.

HFV has no HFV. But somehow has 2 motorcycles > Tripper 08/22/2019 at 17:05

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Yeah. I just have a simple Bluetooth OBD scanner that uses an app on your phone. I was able to clear it with that 

NojustNo > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 17:12

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Ha Have you tried holding the DTC button pn the dash for 5 seconds ? On my 2wd it basically kills everything.

https://www.e90post.com/forums/showthread.php?t=318226

HFV has no HFV. But somehow has 2 motorcycles > NojustNo 08/22/2019 at 17:32

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Yeah. Everything but the AWD. 

Future Heap Owner > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 17:50

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I have no idea if this will work or not, but there’s really only one way to find out.

Textured Soy Protein > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 17:53

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There’s an app for that. Literally .

HFV has no HFV. But somehow has 2 motorcycles > Textured Soy Protein 08/22/2019 at 17:59

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Android only. Dang it! 

Nibby > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 18:15

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sudo make it FWD

Jordan and the Slowrunner, Boomer Intensifies > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 18:50

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Can you not just buy a cheap tablet?

HFV has no HFV. But somehow has 2 motorcycles > Jordan and the Slowrunner, Boomer Intensifies 08/22/2019 at 19:40

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My experience with cheap android tablets has been.

Open app... ... ... crash.... repeat 

Jordan and the Slowrunner, Boomer Intensifies > HFV has no HFV. But somehow has 2 motorcycles 08/22/2019 at 19:45

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That’s my experience with Android in general.