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BMW 3-Series (E90 E92) Forum
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Drone on OEM Performance Exhaust
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06-07-2012, 09:05 PM | #23 | ||
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Is the PE 1/2 as loud as the is one? What the difference then? Anyway, won't highjack - OP, hope you get your drone problem fixed! Let us know what another dealer says...
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06-07-2012, 09:38 PM | #24 |
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I just installed PE on a e92 335i, and was surprised by the differences compared to PE on my e90 330i. It's not quite as deep or "rumbly", at least not yet after 1000 km. The turbos seem to smooth out the exhaust, I suppose. Still fantastic, well worth it!
Anyway, I'm also getting drone cruising around 2500 rpm in the e92, which is common on the highway. The e90 has zero drone IMO. I'll have to check for leaks at the clamps...but it's surprising that could cause drone. I'm wondering if mounting it slightly differently (tighter, or shifted somehow) could effect the resonance of the system. Best idea is to compare to someone else at a meet with the same setup Good excuse to go to a meet
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"WINDING ROAD FOR 7 KM" ... l Last edited by zuluZero; 06-07-2012 at 09:47 PM.. |
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06-07-2012, 10:08 PM | #25 |
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Yeah, I think I'll still have the clamps checked out before I make it stock again.
So it really shouldn't drone at all right? How is the E90 PE different from the E92? Anyways, made an appointment for next Tuesday. I hope it goes well, will keep this post updated just in case someone runs into the same at least this can be informative. |
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06-08-2012, 12:44 AM | #26 |
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e90s have a resonator and upgrading to PE deletes that, so the e90 will have a greater increase in sound as compared to stock.
I installed a PE on my e93 about 3 months ago and have not experienced any drone. As others have already commented, the loud (relatively speaking) start up is normal, but it quiets down after about a minute. I agree with the general consensus that you either: (1) have a slight leak at the clamps or (2) are just more sensitive to drone. I haven't heard of another exhaust that compares with the PE when it comes to drone, given how mild and tame the PE is vs the aftermarket setups. |
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06-08-2012, 01:04 AM | #27 |
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Thanks Baysics.
Yeah I think your point number 1 and 2 kind of sums up what I've been thinking. I am sensitive, but at the same time, I will take it in to another dealer to have it checked out. So a quick question, where does the potential leak come from? Is it from the clamps and if so how? Thanks, John |
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06-08-2012, 02:24 PM | #28 | |
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I don't think this is the exhaust. What you describe is similar to what a few of us noticed to a significantly greater extent when we added M3 rear subframe bushings. One of the guys switched back to standard 3 series bushings and the noise diminished but is still noticeable. My guess is that you are noticing this noise that was there before but because you were listening to your car more you are now more aware of it. See this post
http://www.e90post.com/forums/showpo...5&postcount=32 in this thread http://www.e90post.com/forums/showthread.php?t=532595. I know the thread focuses on the fact that we all had Quaife LSDs installed but it has been determined it is not the LSD but the stiffer bushings that are making the noise you describe more pronounced. Clearly there is an underlying issue...we would all like to know what it is. Quote:
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06-08-2012, 02:31 PM | #29 |
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That's an interesting point, but I doubt it's the bushings
since I heard this noise before I upgraded to the BMW OEM performance suspension. I installed PPK2 and PE at the same time, then I installed the Performance Suspension 2 weeks later. Also, my friend mentioned hearing the drone without me asking if the sound was noticeable. I do know that when I pay attention to it, I can hear it more audibly, but also when I don't pay attention to it, I can still notice it. |
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06-08-2012, 02:35 PM | #30 | |
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Understood, but if you did install the M3 bushings the noise would be significantly worse like what we have. I think the cause is the same but it's transmitted more loudly via the stiffer M3 subframe bushes.
I would be interested to know if you can modulate the sound at will like I describe. It sounds from you description that you can. Quote:
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06-08-2012, 02:41 PM | #32 |
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I could try with my phone, but I don't have a good video camcorder of any sort.
I'll do that maybe later tonight when I get off work. I hope the mic on the phone is good enough to pick up the low frequency tones. |
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06-08-2012, 05:42 PM | #33 |
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I have a bit more 'noise' from my PE but I wouldnt call it a drone, and certainly not intrusive, although what you describe OP, I do notice. Mostly around 2k rpm specifically, and mostly when cold. Once the engine temps rise and the car has been going 10 minutes then I normally do not hear it as pronounced, which should be typical as the exhaust gets warmer.
Whatever it is, I actually like it, since its not really drone actually more 'noise'. Drone is vibrationy which IMO this is not.
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06-08-2012, 06:08 PM | #34 | |
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06-09-2012, 01:06 AM | #35 |
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Here are two videos of my attempt to show you guys what the drone is like. In the first video, I'm actually driving around 60 mph and at the very beginning, the background sound you hear is just the tires going on the road, but 22 seconds in, you'll hear that drone is very pronounced and even a little bit "vibrational" because of its low frequency nature. In the second video, I'm just at a stop and revving the engine. You can definitely hear the droning sound except for some reason the volume on that clip turned out really silent when I upload it to youtube. |
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06-09-2012, 01:09 AM | #36 | |
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But the reshaping is what I got on the receipt from the dealer. It definitely sounded like BS, because it didn't solve anything. |
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06-09-2012, 03:23 AM | #37 | |
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It's not a bolt on or welded system. Rather, the dealer cut the pipe leading to your OEM mufflers. The new PE muffler was then fitted. Basically, you had the new pipe leading from the PE ending right where the cut to the stock piping was made. The pipe ends have no way of conmecting to eachother. To mate the PE pipe to the OEM piping, the dealer used a slip clamp. This clamp basically covered the gap between the PE piping and OEM piping. Both sides of the clamp were then tightened (one to the PE pipe and the other to the OEM pipe) to make a leak proof seal. If the clamps were not fully tightened, you might have air leaking out. Here is a simple illustration that might help you understand: You know how little kids sometimes combine several straws together to make a super long straw? It's a similar principle with the clamps. Assume you are attaching three straws end to end. The middle straw would be akin to the clamp used to fasten your exhaust. If the connection on either end of that middle straw is loose, the liquid would leak out. Similarly, if the seal on either end of your clamp is loose, you would have an exhaust leak. It's not a perfect analogy, but should help you better understand where/how a leak might arise. Good luck finding the problem and fixing it. The PE system is really fantastic, so I hope you are able to get to the bottom of this and better enjoy the PE! |
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06-09-2012, 09:23 AM | #39 | |
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That said, you are an AT and I have an MT so maybe it could be something, but 2krpm exactly on with slight throttle (not enough to accel or slow) it does have that noise on mine, but only when the engine temps are down. Have you drove the car for a long period of time to where the exhaust is hot?
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06-09-2012, 09:42 AM | #40 |
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Dackz, thanks for your input, the sound doesn't go away even after a long drive. I was driving from Los Angeles to Palm Springs the other day and it sounded like that the whole way. I know what you mean that the exhaust can be more noisy, but even when the engine oil is ~240-250, the droning sound is still very apparent, is that normal? In fact, when I first had the PE installed, I thought to myself that maybe it'll take some time for the exhaust to settle in, but it didn't and the noise level has never gone down.
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06-09-2012, 09:45 AM | #41 | |
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06-10-2012, 01:10 AM | #42 | |
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06-10-2012, 01:17 AM | #43 |
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I'm not tuned. The thing about waiting and hoping the exhaust drone goes away after time is that I actually drive friends from time to time and they can also hear the drone. ~_~" Only have PPK Stage 2 installed.
I guess my main concern is: 1) Whether or not the problem is normal, because if it is, I guess I've made up my mind to go back to the stock exhaust. 2) If the problem is not normal, what is the best course of action to get it resolved. A) Have the PE properly resealed and have the clamps re-tightened B) If it's a faulty PE exhaust that has problems, have it replaced by BMW. C) If it's un-fixable, have the stock exhaust reinstalled and sell the PE part. Last edited by jyeah; 06-10-2012 at 01:24 AM.. |
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06-10-2012, 08:14 AM | #44 | |
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