Downpipes and wastegate rattle...

E92Fan · 03-24-2009, 09:18 PM

Quick question for all those who have installed replacement catless downpipes - have you noticed that after installation, the wastegate noise/rattle is much louder and more prominent? I presume this is due to the lower back pressure due to the lack of restriction in the downpipes ?? Has anyone done the turbo-lag retrofit with ISTA 32.2 in this situation? Has it reduced the wastegate noise, or increased it further??

maui86 · 03-25-2009, 01:08 AM

when i installed mine, the noise was so loud it was embarrassing actually. maybe its the material of the pipes on the aftermarket ones? i have no clue, but its pretty loud. luckily for me, the rattle was only during the first 30secs or so of cold start then it went away. i could barely hear it upon decel. if i rev it up. i dont know if i should take it to the dealer to try get them to fix it. i tried the way mr.5 suggested but for me, i believe it was the front wastegates.

teri

ar design · 03-25-2009, 09:30 AM

Yes, it will make it more noticeable, because you are removing a "muffler" (the catalyst) that hides a lot of the noise.

Jeller · 05-18-2009, 10:45 AM

Mine is very noticeable after the DP Install, I have the same question...

Has anyone done the update to 32.1 and had any sucess?

Mine is not rattling on idle, but upon acceleration and between shifts, sounds like ass.

battlehawk1025 · 05-18-2009, 11:53 AM

even when i changed from the stock exhaust to aftermarket it got louder.

jaysonbmw · 05-18-2009, 04:21 PM

I jus't drop my car at the dealer for this stupid noise!!!

Jeller · 05-18-2009, 06:41 PM

Quote:

Originally Posted by jaysonbmw

I jus't drop my car at the dealer for this stupid noise!!!

Please update if you can^
Mine is pretty metallic sounding, upon acceleration and kind between shifts I get it.

Jeller · 06-01-2009, 09:14 PM

Updated software to newest version, still sounds like ass, very metallic sounding and its back in stock form, with DP's still on. Looks like the DP's will be coming off and taking it back in for new actuators.

Vudoo4u2 · 06-01-2009, 09:27 PM

mine is the same upon cold start...but not when its moving, after it warms up all runs perfect

03-24-2009, 09:18 PM	#1
E92Fan Moderator 322 Rep 5,493 Posts Drives: . Join Date: Aug 2007 Location: . iTrader: (0)	Downpipes and wastegate rattle... Quick question for all those who have installed replacement catless downpipes - have you noticed that after installation, the wastegate noise/rattle is much louder and more prominent? I presume this is due to the lower back pressure due to the lack of restriction in the downpipes ?? Has anyone done the turbo-lag retrofit with ISTA 32.2 in this situation? Has it reduced the wastegate noise, or increased it further?? __________________ ... ... ... DMS Remap Review ----- Quaife LSD Review ----- Hartge Antiroll Bars Review ----- Bilstein PSS10 B16 Ride Control Review ----- Detail by ShineOn ----- Paintshield Review
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03-25-2009, 01:08 AM	#2
maui86 Captain 37 Rep 738 Posts Drives: 07 335i Join Date: Nov 2007 Location: paradise iTrader: (1)	when i installed mine, the noise was so loud it was embarrassing actually. maybe its the material of the pipes on the aftermarket ones? i have no clue, but its pretty loud. luckily for me, the rattle was only during the first 30secs or so of cold start then it went away. i could barely hear it upon decel. if i rev it up. i dont know if i should take it to the dealer to try get them to fix it. i tried the way mr.5 suggested but for me, i believe it was the front wastegates. teri __________________ http://videos.streetfire.net/video/s...rays_37268.htm gotta do what i gotta do to get them donuts 04 spec-v: rip dec07
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03-25-2009, 09:30 AM	#3
ar design 295 Rep 4,408 Posts Drives: 04 M3 Join Date: Jan 2008 Location: Denver, CO iTrader: (9)	Yes, it will make it more noticeable, because you are removing a "muffler" (the catalyst) that hides a lot of the noise. __________________ -Critter
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05-18-2009, 10:45 AM	#4
Jeller Lieutenant 15 Rep 506 Posts Drives: 2007 335i E90 ZSP Join Date: Oct 2008 Location: Buffalo NY iTrader: (5)	Mine is very noticeable after the DP Install, I have the same question... Has anyone done the update to 32.1 and had any sucess? Mine is not rattling on idle, but upon acceleration and between shifts, sounds like ass.
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05-18-2009, 11:53 AM	#5
battlehawk1025 battlehawk1025 44 Rep 883 Posts Drives: 2007 335XI 6mt, SL 65 , M6 Join Date: Aug 2007 Location: wilmette/chicago,IL iTrader: (4)	even when i changed from the stock exhaust to aftermarket it got louder.
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05-18-2009, 04:21 PM	#6
jaysonbmw F1 8 Rep 226 Posts Drives: Formula 1 E92 Join Date: Apr 2008 Location: PR/Orlando Fl iTrader: (0)	I jus't drop my car at the dealer for this stupid noise!!!
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06-01-2009, 09:14 PM	#8
Jeller Lieutenant 15 Rep 506 Posts Drives: 2007 335i E90 ZSP Join Date: Oct 2008 Location: Buffalo NY iTrader: (5)	Updated software to newest version, still sounds like ass, very metallic sounding and its back in stock form, with DP's still on. Looks like the DP's will be coming off and taking it back in for new actuators.
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06-01-2009, 09:27 PM	#9
Vudoo4u2 Night Sh1ft 458 Rep 3,079 Posts Drives: F95 X5MC LCI Join Date: Oct 2007 Location: It's bobsled time iTrader: (3) Garage List 2024 BMW X5M Compet ... [0.00]	mine is the same upon cold start...but not when its moving, after it warms up all runs perfect __________________ "Your first 10,000 photographs are your worst.” ― Henri Cartier-Bresson
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