JB4 question

sh0x93 · 06-29-2018, 10:27 PM

New to the forum here! My '10 335xi is at 75k miles and I'm pretty darn sure that I've got wastegate rattle. I hear the jb4 masks it somehow. How exactly does it do that? Does it make them open up at a higher rpm?

Also, I swapped my vacuum lines out with silicone and left the ones to the vacuum canisters off just to make sure it was my turbos that we're making the noise. I drove around a wee bit and concluded they were. Wouldn't I get like a low boost error or some kinda check engine light that would come on?

Aceway · 07-01-2018, 07:24 AM

Jb4 menu 10 adjusts default wastegate position. Had stock turbos with almost 100k miles and wastegate rattle was pretty bad. Got 30ff codes every now and then but wasn't very common. Default for menu 10 should be 3000, I set it to around 1100 and it helped a little bit. When I try going any lower than 1100, car would throw 30ff code more often.

06-29-2018, 10:27 PM	#1
sh0x93 Registered 0 Rep 3 Posts Drives: 2010 335xi Join Date: May 2018 Location: North Dakota iTrader: (0)	JB4 question New to the forum here! My '10 335xi is at 75k miles and I'm pretty darn sure that I've got wastegate rattle. I hear the jb4 masks it somehow. How exactly does it do that? Does it make them open up at a higher rpm? Also, I swapped my vacuum lines out with silicone and left the ones to the vacuum canisters off just to make sure it was my turbos that we're making the noise. I drove around a wee bit and concluded they were. Wouldn't I get like a low boost error or some kinda check engine light that would come on?
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07-01-2018, 07:24 AM	#2
Aceway Captain 462 Rep 875 Posts Drives: E82 135i / F25 28i Join Date: Feb 2018 Location: SoCal iTrader: (2)	Jb4 menu 10 adjusts default wastegate position. Had stock turbos with almost 100k miles and wastegate rattle was pretty bad. Got 30ff codes every now and then but wasn't very common. Default for menu 10 should be 3000, I set it to around 1100 and it helped a little bit. When I try going any lower than 1100, car would throw 30ff code more often.
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