Backfiring after JB4 ISO firmware update?

1stockbmw · 12-15-2012, 08:42 PM

Hey guys so I was wondering if my car was supposed to be backfiring from updating to the ISO firmware. I know it is supposed to have the gurgling sound but the backfiring is new. Here is a video for reference. The motor is the N55 and this is already warmed up.

mashimarho · 12-16-2012, 10:29 AM

Hmm... I can't imagine why. I wonder if mine sounds like this...
I don't have ISO though.

E90Company · 12-16-2012, 10:33 AM

That sounds badass! Who cares lol

Dark_Knight_335 · 12-16-2012, 02:24 PM

My Dinan exhaust does that- pretty badass, and normal- for my exhaust at least.

jsmonet · 12-16-2012, 02:29 PM

Just FYI, that's afterfire, otherwise known as little pockets of unburnt fuel igniting in the exhaust. Backfiring is a far more serious issue usually requiring, at the least, a new intake manifold after it happens

Overrun/afterfire is no big deal.

sA x sKy · 12-16-2012, 04:31 PM

Quote:

Originally Posted by jsmonet

Just FYI, that's afterfire, otherwise known as little pockets of unburnt fuel igniting in the exhaust. Backfiring is a far more serious issue usually requiring, at the least, a new intake manifold after it happens

Overrun/afterfire is no big deal.

Your definition of afterfire is backfire...

Backfire happens when you run too rich and unburnt fuel ignites in the exhaust..its perfectly normal and fine if you're catless. Just have to be careful of the O2 sensors.

PR3CI5N · 12-16-2012, 04:38 PM

You have your mufflers deleted?

1stockbmw · 12-16-2012, 05:36 PM

Yup mufflers are deleted. I just love the sound haha. Oh and also I still have the stock downpipe so I am not running a catless set up, its just the muffler delete.

madmanhiker · 12-16-2012, 06:23 PM

I noticed the same issue - I emailed Terry about it already as well. Let him know, this may be a characteristic of the new firmware in certain configurations. I did NOT backfire nearly as much prior to the ISO, and I know my car inside and out.

SfValley335i · 12-16-2012, 07:28 PM

look at this way, now you can shoot fireballs from your muffler

BMW_Belgier · 12-17-2012, 05:36 AM

Just like the PPK...

335iBoii · 12-29-2012, 09:14 PM

i like it.. lol

12-15-2012, 08:42 PM	#1
1stockbmw Private 6 Rep 55 Posts Drives: 2011 E90 335i PE Join Date: Jul 2009 Location: Woodland Hills, CA iTrader: (1) Garage List 2011 BMW 335i Perfo ... [0.00]	Backfiring after JB4 ISO firmware update? Hey guys so I was wondering if my car was supposed to be backfiring from updating to the ISO firmware. I know it is supposed to have the gurgling sound but the backfiring is new. Here is a video for reference. The motor is the N55 and this is already warmed up.
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12-16-2012, 10:29 AM	#2
mashimarho BimmerPost Supporting Vendor 2144 Rep 13,877 Posts Drives: E92 M3 & F80 M3 & G82 M4 Join Date: Mar 2010 Location: Lynnwood, WA iTrader: (45) Garage List 2021 BMW G82 M4 [0.00] 2011 BMW E92 M3 [0.00] 2015 BMW F80 M3 [0.00] 2012 BMW 335i xDrive [9.78]	Hmm... I can't imagine why. I wonder if mine sounds like this... I don't have ISO though. __________________ Mashimarho.com /// Instagram /// Facebook /// Youtube /// sales@mashimarho.com /// (425) 582-7939
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12-16-2012, 10:33 AM	#3
E90Company Major General 198 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)	That sounds badass! Who cares lol
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12-16-2012, 02:24 PM	#4
Dark_Knight_335 Came to the N55 Darkside 1131 Rep 12,740 Posts Drives: 2011 335 E93 M-Sport Join Date: May 2010 Location: NY/NJ iTrader: (28)	My Dinan exhaust does that- pretty badass, and normal- for my exhaust at least.
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12-16-2012, 02:29 PM	#5
jsmonet Captain 302 Rep 913 Posts Drives: 2020 x7 m50i Join Date: Nov 2011 Location: so cal iTrader: (2)	Just FYI, that's afterfire, otherwise known as little pockets of unburnt fuel igniting in the exhaust. Backfiring is a far more serious issue usually requiring, at the least, a new intake manifold after it happens Overrun/afterfire is no big deal. __________________ 2020 bmw xHippo, v8tt edition
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12-16-2012, 04:38 PM	#7
PR3CI5N need4speed 510 Rep 1,903 Posts Drives: 2010 E90 M 335i Join Date: Jun 2010 Location: West Coast iTrader: (24)	You have your mufflers deleted? __________________ N54
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12-16-2012, 05:36 PM	#8
1stockbmw Private 6 Rep 55 Posts Drives: 2011 E90 335i PE Join Date: Jul 2009 Location: Woodland Hills, CA iTrader: (1) Garage List 2011 BMW 335i Perfo ... [0.00]	Yup mufflers are deleted. I just love the sound haha. Oh and also I still have the stock downpipe so I am not running a catless set up, its just the muffler delete.
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12-16-2012, 06:23 PM	#9
madmanhiker Lieutenant Colonel 87 Rep 1,615 Posts Drives: '11 E92 335i Join Date: Jul 2008 Location: Jacksonville, Fl iTrader: (5) Garage List 2011 335i M-Sport [6.00] 2008 328i Sport Pre ... [0.00]	I noticed the same issue - I emailed Terry about it already as well. Let him know, this may be a characteristic of the new firmware in certain configurations. I did NOT backfire nearly as much prior to the ISO, and I know my car inside and out. __________________ -madmanhiker jax,fl
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12-16-2012, 07:28 PM	#10
SfValley335i Colonel 167 Rep 2,409 Posts Drives: Current:135i Sold:335i sedan Join Date: Mar 2007 Location: City of Angels iTrader: (8)	look at this way, now you can shoot fireballs from your muffler
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12-17-2012, 05:36 AM	#11
BMW_Belgier Lieutenant Colonel 104 Rep 1,597 Posts Drives: E92 335xi n55 Join Date: May 2012 Location: Switzerland iTrader: (0)	Just like the PPK... __________________ BEFORE: 130i N52 (2006-2011) NOW: 335xi N55 (2011- )
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12-29-2012, 09:14 PM	#12
335iBoii Take Off* 5 Rep 47 Posts Drives: 335i Join Date: Dec 2011 Location: GTA iTrader: (0)	i like it.. lol __________________ JB4 G5 ISO, AR DP's, ER CP, Synapse BOV, AlpineMSS HID, BMS Oil Catch Can, BMS CDV... WISHLIST--> LSD Last edited by 335iBoii; 12-30-2012 at 12:48 PM..
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