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post #11 of 25 Old 4th February 2017, 02:30 PM
pmalik
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Quote:
Originally Posted by kglover21 View Post
It should actually be the opposite of this, listen on the CAN-BUS for the specific M Mode message and then use this to trigger an output to open exhaust valves or whatever you fancy. Listening to the bus wont upset it, unless you get bus speeds or termination wrong
Yeah, you don't wanna broadcast anything - just listen for the frame that has the right identifier and toggle your internal state on and off. I would hope they have two frames, one of with on and one with off so none of the modules listening would get out of sync*.

* canbus isn't reliable multicast last i checked, so you'd expect all the frames to be state-explicit (M mode on, M mode off rather than M mode toggle).


Also it's pretty amusing that every m-car forum has a huge engineer userbase.

Last edited by pmalik; 4th February 2017 at 02:37 PM.
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post #12 of 25 Old 4th February 2017, 02:31 PM
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Trigger relay or other accesories with M button

Oh. Well that is super easy with an Arduino or the like. In fact I just built a contraption like that for my own exhaust.

Last edited by rt7085; 4th February 2017 at 02:32 PM.
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post #13 of 25 Old 4th February 2017, 02:35 PM
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Trigger relay or other accesories with M button

Trigger relay or other accesories with M button-imageuploadedbyautoguide1486211579.048637.jpg

This thing listens (and talks) on CAN to throttle input, RPM and speed, measures actual vacuum pump negative pressure for actuating the exhaust valves, monitors pump temperature, activates and deactivates the pump via a relay. I slapped a display on it because I could. Adding the M button is trivial. Let me know if you need help.

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post #14 of 25 Old 4th February 2017, 02:42 PM
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Originally Posted by rt7085 View Post
This thing listens (and talks) on CAN to throttle input, RPM and speed, measures actual vacuum pump negative pressure for actuating the exhaust valves, monitors pump temperature, activates and deactivates the pump via a relay. I slapped a display on it because I could. Adding the M button is trivial. Let me know if you need help.
What do you actually use for the exhaust valves? The electric stepper motor ones won't last more than couple months with that duty cycle. OEMs all do spring loaded vacuum ones (I had an S8 with that setup), thought i haven't seen any aftermarket ones.

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post #15 of 25 Old 4th February 2017, 02:54 PM
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I have a Frequency Intelligent exhaust with vacuum valves. That is the way to go. I bought a separate vac pump (Hella PU-28) which is the same as the pump in our cars. It makes -1 bar. The problem is that these pumps draw 120W (10A) and get hot when they run too long. I have it tucked away under the trunk liner for noise. I tried it the simple way with a vacuum cut off relay and a pressure accumulator. But sometimes the pump would not shut off. So hence this extra stuff. Now I can monitor and control it safely. I could simply have run a vacuum hose to the engine vacuum. But I don't want to compromise that. Besides what fun would that be. LOL!
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post #16 of 25 Old 4th February 2017, 03:52 PM
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post #17 of 25 Old 4th February 2017, 04:11 PM
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Trigger relay or other accesories with M button

Quote:
Originally Posted by pmalik View Post
Hmm why not recycle one or two of the 335i exhaust valve pumps?



https://www.turnermotorsport.com/p-1...-exhaust-flap/


That is not a pump. That is a control valve. I have one of these as well. Different brand. But indeed, you collect vacuum in the accumulator and when you are ready, you release the vacuum into the exhaust actuators. You need a check valve between the pump and the accumulator to trap the vacuum. I found one on amazon for a couple of bucks. Get good silicone vacuum hoses. I found several grommet locations on the left and right sides of the truck bottom that were located right behind the bumper over the exhaust muffler locations to get out to the actuators.

Last edited by rt7085; 4th February 2017 at 06:28 PM.
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post #18 of 25 Old 5th February 2017, 03:31 AM
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Originally Posted by rt7085 View Post
That is not a pump. That is a control valve. I have one of these as well. Different brand. But indeed, you collect vacuum in the accumulator and when you are ready, you release the vacuum into the exhaust actuators. You need a check valve between the pump and the accumulator to trap the vacuum. I found one on amazon for a couple of bucks. Get good silicone vacuum hoses. I found several grommet locations on the left and right sides of the truck bottom that were located right behind the bumper over the exhaust muffler locations to get out to the actuators.
Oh whoops, you're right the 335 cars have mechanical vacuum pumps.
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post #19 of 25 Old 11th February 2017, 12:18 AM
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So I had a thought. The "Power" button on the gearknob surround has a little orange LED that comes on when in M mode.

I'm thinking what if I take the surround off and tap one of the wires going to the button. It must have a 12v positive feed that lights up the LED when active.

If I can find which wire it is and then I could tap it and run it to a small relay I could then use the trigger wire from that to feed the exhaust cut outs...

What do you guys think?
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post #20 of 25 Old 11th February 2017, 12:31 AM
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Originally Posted by jpw0809 View Post
So I had a thought. The "Power" button on the gearknob surround has a little orange LED that comes on when in M mode.

I'm thinking what if I take the surround off and tap one of the wires going to the button. It must have a 12v positive feed that lights up the LED when active.

If I can find which wire it is and then I could tap it and run it to a small relay I could then use the trigger wire from that to feed the exhaust cut outs...

What do you guys think?
Very good thought! That may just work to trigger the control side of a relay. Pin #1 on the power button gets 12v to turn on the LED, just make sure your relay is wired in series or the LED won't work anymore.


Last edited by CHARIOT; 11th February 2017 at 12:40 AM.
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