06-28-2020, 12:35 AM | #1 |
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First track day / muffler paint flaking
Hi all -
Took the M2C for its first track outing at Dominion Raceway. What a blast. It's my 3rd time on a track (including M school) and was fortunate that my CA who is also an instructor joined me for a morning of instruction. Was already in love with the car but this really took it to the next level. Really trusted the car and got a lot more confidence towards end of the day. Also really appreciated the engine note in the higher RPMs - I stayed in comfort the whole day + windows down while racing so I could really hear it. One FYI - my black high temp muffler paint burned off a bit by end of day. No biggie and not surprising given how hot the car was running. Photo attached. Just for fun, here's a video from the cockpit of one my later runs. Big improvement from the start of the day. Stay safe all. |
06-28-2020, 07:05 AM | #2 |
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Nice!
May I ask what type paint you used on the muffler? I used VHT high temp ~ 1500 degrees iircc...
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06-28-2020, 07:54 AM | #3 |
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Make sure you scuff the muffler really well with a green Scotchbrite pad before you paint it, and as stated above, use high-temp exhaust paint. Should be fine with those two things. BMW should have done it for you...
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06-28-2020, 08:06 AM | #4 |
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Almost certainly the risk of flaking (and possible subsequent claims) is the reason why BMW leaves the muffler unpainted.
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06-28-2020, 08:30 AM | #5 | |
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Scuff first, maybe wipe with phosphoric acid to etch, neutralize, use a high temp paint. Anyone try a thinned down rhino lining? |
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06-28-2020, 08:43 AM | #6 | |
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06-28-2020, 09:36 AM | #7 | |
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We're talking about German engineering here, and you really don't believe they could make the paint stick? I respectfully disagree, and would add that I know of an automotive undercoating that doesn't even need to be scuffed to stick forever. But forever is a long time, so that's why I don't recommend it here. |
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06-28-2020, 10:21 AM | #8 | |
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So let's just say that it wouldn't be a surprise. Painting with heat resistant paint is possible and dark paint partially obscures its size, but nevertheless BMW refrains from doing it (unlike for example exhaust tips or configurator renders).
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06-28-2020, 10:51 AM | #9 | |
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I found a company in the Netherlands specialised in that kind of things. They made me a quotation of 968 €. 1 year guaranty for temperatures until 1050 centigrade. It isn't worth it for me at that price e. |
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06-28-2020, 10:57 AM | #10 | |
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06-28-2020, 11:20 AM | #11 |
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06-28-2020, 12:26 PM | #12 |
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06-28-2020, 12:52 PM | #13 | ||
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The writing is on the wall; they didn't paint the exhaust black to conceal it because they knew they would possible be bombarded with warranty claims.. There is no way in hell they missed this glowing eyesore below, in pre-production and just decided to to leave it, as is, just for the hell of it. |
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06-28-2020, 01:12 PM | #14 |
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Wonder if it's possible to blue it, like they do with guns. I'm not too familiar with the process. I think it's a chemical you just wipe onto the metal and it creates a black oxide layer. Would have to research to see if it can be done to the type of metal the m2c exhaust is made from.
https://en.wikipedia.org/wiki/Bluing_(steel) |
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06-28-2020, 01:29 PM | #15 |
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A mountain friend of mine took precautions. Unfortunately, looking good didn't last long. Looked like a mess. He resolved the flaking issue by replacing the exhaust with a smaller aftermarket one.
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06-28-2020, 01:37 PM | #16 |
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Dude, be honest. If they can engineer a car like the M2, they can engineer a way to make black paint stick to the back of a muffler. And yes, it may be cost prohibitive for them, but it's not as if it hasn't been done before.
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06-28-2020, 01:44 PM | #17 | |
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Mercedes did just that and painted their exhaust and tips black and even those started fading, forcing them to replace entire exhaust systems, under warranty.. I say it's smart money BMW left it uncoated, as ghastly as it looks.. Google the subject, every auto manufacture that painted their exhaust, eventually had to deal with color fading.. |
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06-28-2020, 02:30 PM | #18 | |
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Imagine for a moment that you're in charge at BMW, what would you recommend about exhaust painting for the future ?
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06-28-2020, 02:31 PM | #19 | |
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No, I'd tell them to richen the fuel mix |
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06-28-2020, 09:07 PM | #20 | |
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I'm going to leave my ball bag exhaust till i can afford an aftermarket one. No point painting it and having it slowly peel off, I reckon that would look worse (paint flaking off) than just a shiny ball bag.
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06-29-2020, 04:47 AM | #21 |
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I remember back in the 90s most JDM had black exhaust muffler...the blackness faded away over time but the paint did not flaked off.
OEM DC5 Integra Type R mufflers shown here |
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06-29-2020, 05:45 AM | #22 |
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If there is a fire from a painted exhaust, the BMW warranty will not be valid. In Europe, so. Maybe in the USA differently? The exhaust manufacturer and BMW are not responsible for the changes you make.
In Europe, there are a lot of insurance cases of pipe and plastic fire due to improper tuning. Any change that you make to the car without inspection or special permission, removes all warranties from the manufacturer.
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