09-23-2021, 10:15 AM | #1 |
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Cold start rattle with PSI Midpipe
So after I installed the PSI midpipe, I am getting a massive rattle upon cold start. Just wondering if anyone else has experienced this. I think it may be the valves flapping but I'm not sure how to diagnose it. All I know is that this rattle is horrific. Still there even in comfort engine mode although not quite as bad. The system sounds great after the cold start has completed. If it is the valves flapping I'm afraid I may have to wire them open. I'd really hate to lose the valve functionality though.
Last edited by sleepy75; 09-23-2021 at 10:33 AM.. |
09-23-2021, 02:35 PM | #2 | |
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09-23-2021, 02:47 PM | #3 |
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Yeah the pipe could be rattling off the brace as others have reported. Same with the Valvetronic
Apparently this is caused by cutting the exhaust in the wrong place. My Valvetronic just arrived today so will definitely be cautious with the install. You could get around this by adding some washers to the brace (not ideal), or having the exhaust adjusted. I don't think it's the valves |
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09-23-2021, 06:26 PM | #5 |
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I can now confirm that the obnoxious cold start rattle is neither the cross brace clearance or the exhaust flaps. I temporarily removed the brace and wired the valves open. Proceeded to cold start with the same result. The only thing that begins to manage it is comfort mode with the exhaust sound button off. Again, the noise is only during cold start. After that completes (10 seconds?) everything sounds awesome.
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09-23-2021, 07:17 PM | #6 | |
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09-23-2021, 07:18 PM | #7 | |
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09-24-2021, 05:45 AM | #8 | ||
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They seem to have the materials now and are churning them out so you should be good soon I bet |
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09-24-2021, 06:36 AM | #9 |
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You can hear the m cold start now. Mine doesnt touch the x brace and the cold start from bmw is fucking hilarious. Its not even good. I start in eco with valves shut and get the fuck out of the garage asap. Once its warmed up it sounds beautiful on startup. At the gas station sport plus im breaking people’s necks theyre like oh damn whats that!
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09-24-2021, 07:06 AM | #10 | |
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09-24-2021, 09:43 AM | #11 |
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Video, or it didnt happen
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09-24-2021, 09:48 AM | #12 |
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I remote start mine from in the house in the morning. I don't want to be near it incase neighbors are out there walking.
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09-24-2021, 12:57 PM | #13 |
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Are there any videos for the cold start post-midpipe install? I'm on the fence about it, and have been worried about any rasp but it now seems that a cold start in non-eco mode sounds terrible? Or perhaps I'm misunderstanding.
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09-24-2021, 03:26 PM | #14 |
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In my opinion, yes, the cold start sounds terrible. I’ll try to get a video of it up later tonight or tomorrow.
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09-27-2021, 06:17 AM | #15 |
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This isnt unique to the psi mid pipe. Any mid pipe or exhaust will sound like shit. Its the M performance cold start program. Its just absurd
https://g80.bimmerpost.com/forums/sh...1&postcount=44 I posted some warm starts here… as you can see it has nothing to do with the mid pipe. Its all running through the stock muffler, which determines the volume. The only difference between mid pipes is flow and pitch
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09-28-2021, 08:17 AM | #17 |
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Yes middle
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01-04-2022, 09:14 AM | #18 |
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Stumbled across this thread. I too have a pretty obnoxious cold-start with my PSI mid pipe. No vibrating or rubbing on the crossmember, and it seems like it's just the frequency/pulses of the exhaust during the cold-start. The buzzing sound is most definitely coming from the rear muffler section.
I could see how this is going to happen with any mid-pipe. I wonder if this would change with a different rear section (along with being louder, just no buzzing/vibrating). Either way, thankful it only lasts a few seconds. Otherwise, extremely happy with the PSI pipe. Car sounds damn epic in full sport+. |
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01-04-2022, 09:23 AM | #19 |
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cant wait for bm3 so i can disable the cold start
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01-04-2022, 12:57 PM | #20 | |
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01-04-2022, 01:16 PM | #21 | |
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01-04-2022, 09:34 PM | #22 |
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I fiddled with the valves and safety wired them open, just to see the impact on the cold start paired with mid pipe… dear god, sounded like the world was ending. So loud.
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