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      03-13-2020, 06:28 AM   #1
Filip3615
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Open exhaust flap during cold start on 435i?

Hey guys, I've got a F36 435i 2015, with a supersprint exhaust, and a wagner tuning catless downpipe (which sounds amazing!).
When I bought the car it had Jb4 but I changed this to MHD cause it fitted my needs better. Although the only "issue" i have with this is I can not manually choose when to have my exhaust flap open, except in WOT Comfort/Sport mode. With the JB4 I could open it through the BC button at any time.

So... I wonder if there is some way to manually open the exhaust flap on cold start.
Thanks!
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      03-13-2020, 11:20 AM   #2
mike@x-ph.com
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I'm not familiar with MHD but I know this feature is available with bootmod3. It can be found in the interface
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      03-13-2020, 01:48 PM   #3
DreamerJoe
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in the MHD map write options prior to flashing it lets you check a box to have the valve always open in sport/+ mode.
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      03-13-2020, 07:11 PM   #4
Filip3615
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DreamerJoe I think I know which option you mean. This does not include cold starts however. At least not in my car.
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      03-13-2020, 07:46 PM   #5
Munchi435i
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Quote:
Originally Posted by Filip3615 View Post
DreamerJoe I think I know which option you mean. This does not include cold starts however. At least not in my car.
Why not just get an axle back exhaust with no valve. Not sure why anyone would want such a loud cold start
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      03-13-2020, 08:01 PM   #6
Filip3615
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Munchi435i I'm satisfied with the exhaust system. But I was asking just in case there was any way. It's fun to do once in a while.
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      03-14-2020, 08:19 PM   #7
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Yeah, the MHD option selection does NOTHING. I have the M Sport exhaust, and the valve is actually closed all the time until conditions are met.
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      03-14-2020, 10:17 PM   #8
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Quote:
Originally Posted by AmuroRay View Post
Yeah, the MHD option selection does NOTHING. I have the M Sport exhaust, and the valve is actually closed all the time until conditions are met.
What is the m-sport exhaust? To my knowledge there is the stock exhaust that comes with all trim levels of 335i/435i and the M-performance exhaust which is an additional option.
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