12-29-2016, 01:59 PM | #243 |
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01-02-2017, 04:33 PM | #244 |
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Thanks OP and everyone else who made this thread informative. I finally did resonator delete and I'm really happy with the result! It really compliments MPE
Last edited by zen0s; 01-02-2017 at 04:57 PM.. |
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01-04-2017, 10:07 PM | #245 |
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mufflers and resonators are on your car for a reason and its not recommended to delete either.
a res is designed around your engine and you will lose torque plus get an awful droning sound betwen 2500-3000rpm so whoever is considering to do this, beware. if you want a nice sound keep your resonator and muffler, and install a downpipe. |
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01-05-2017, 01:36 PM | #246 | |
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I have the AWE midpipe instead of my resonator, didn't lose any torque, it sounds great, has no drone. The only downside is that cold starts are much louder. This is because the "resonator" isn't actually a resonator - it's a secondary catalytic converter that doesn't have any sensors. It's used during cold starts and warm ups. When the car warms up, the main catalytic converter (with the sensors) takes over and the secondary cat isn't fully utilized. On the other hand, the downpipe replaces the primary catalytic converter, which IS monitored closely by the car, and will throw codes and fail emissions testing if deleted. And is more likely to cause drone since that is the cat used during regular driving. Some people will have a downpipe, get the resonator delete, and then complain that there's too much drone and go back to DP only - that's because of the DP, not the resonator delete. |
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01-05-2017, 01:47 PM | #247 | |
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if you look at an exhaust from an e92, or a n55 stock exhaust you will note that there is a factory x-pipe in place of where a resonator would otherwise be. its there for a reason. |
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01-05-2017, 02:10 PM | #248 | |
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http://thumbs3.ebaystatic.com/d/l225...vLRa5cu0wg.jpg We're talking about the "resonator" in the middle, no? That's a secondary cat, at least according to AWE. Not sure what you mean RE: x-pipe, maybe it's different for the N54 since it's a twin-turbo setup (with two downpipes and secondary cats). Either way, if you removed the secondary cat/resonator on the F30 N55 exhaust, you would only lose torque if you had absolutely no back pressure. So then it comes down to your DP and your muffler. I'm sure if you just straight piped everything after the cat you might lose a bit of torque, but not much. Last edited by donkey; 01-05-2017 at 02:18 PM.. |
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01-05-2017, 02:23 PM | #249 | |
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as for the older secondary cat design on engines like the n52 and n54, the throttle response improved when you remove them. particulary in high rpm's there is also an approx 5hp increase in power which you can feel. there are gains to be had from deleting them. |
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01-06-2017, 08:08 PM | #250 | |
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How is the in cab drone around 2000rpm?
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01-10-2017, 07:49 AM | #251 | |
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01-10-2017, 08:05 AM | #252 | |
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I absolutely agree with the "effects" of RES delete, but I don't agree with the function of it: there's no secondary catalytic converter inside! The RES is designed only for reducing sound and drone. Anyway, I put on a HJS 300 cells DP and removed RES by installing a stright-line by Ragazzon (Italy), with original MPE, and I'm very happy with the sound, having experience no drone effect and a louder beautiful sound. Yes, the cold starts are terrible and gives you problems with neighbors
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01-10-2017, 10:44 AM | #253 | |
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http://s1190.photobucket.com/user/20...0lci2.jpg.html here is a link of your stock exhaust. somewhere in the middle of the exhaust, you see an X pipe. right there buddy. before the pipes start to do those interesting bends and then connect to the exhaust. like i said for the fourth time, you lose torque in the absence of a resonator. thus, this is why there is a factory x-pipe fitted to the exhaust. |
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01-10-2017, 10:46 AM | #254 | |
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I can show you a picture of my stock exhaust that's sitting in my garage if you really don't believe us. There is no x-pipe for f series n55, or probably any N55. Last edited by donkey; 01-10-2017 at 11:15 AM.. |
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01-10-2017, 11:03 AM | #255 | |
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IIRC it is essentially similar to a hi-flow cat, and has the same materials inside. Agreed that it is primarily used for sound. |
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01-10-2017, 04:35 PM | #256 | |
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01-10-2017, 04:51 PM | #257 | |
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01-10-2017, 05:21 PM | #258 |
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01-10-2017, 05:23 PM | #259 | |
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why do the newer engines have nothing in the middle of the exhaust? is it a matter of cost cutting or simply removing unnecessary shit. (who the hell needs secondary cats if they have god damn primary cats to begin with?) |
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01-12-2017, 03:23 AM | #260 | |
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01-12-2017, 03:27 AM | #261 | |
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https://www.realoem.com/bmw/enUS/sho...diagId=18_0977 Anyway, if you were told by AWE I want to deepen the matter... Edit: I talked with my friend @franzzz who had removed the central resonator from its 335i AH and has the stock part at home: it is only a simple sound reducer, with no catalytic converter inside
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01-17-2017, 09:34 AM | #262 | |
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There is not x-pipe on our cars so why you want us to put one. As people said the resonator is to help reducing noise and drone on start up.
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