Low end boost gone

335dM · 11-04-2016, 04:16 PM

Just got my car back from dealer after 2 months!
Under warranty
New head
2 new turbos
New intercooler

Now no more low end boost!
No SES
?????

kydiesel35 · 11-04-2016, 05:16 PM

It's your vacuum lines.

Refer to Yozh's threads.

TorqueAddict · 11-04-2016, 06:14 PM

Ya, probably they did not put the vacuum lines back in place correctly - or - one of your vacuum solenoids is bad.

BB_cuda · 11-04-2016, 09:50 PM

2 months and they didn't catch this after getting back together. You might consider a different service dept.

335dlci · 11-04-2016, 11:57 PM

Why was your car at the desler for 2 months?

335dM · 11-05-2016, 07:31 AM

Quote:

Originally Posted by 335dlci

Why was your car at the desler for 2 months?

cbu
Coolant over temp.

They investigate because they were no ses
They put a new head because walnut was not working
2 new turbos
New I/c
New radiator
Scr metering valve
Nox sensor

BB_cuda · 11-05-2016, 08:24 AM

Wonder what happened to the head? I mean where it is now

335dlci · 11-05-2016, 10:58 AM

Quote:

Originally Posted by 335dM

cbu
Coolant over temp.

They investigate because they were no ses
They put a new head because walnut was not working
2 new turbos
New I/c
New radiator
Scr metering valve
Nox sensor

Wow. Sounds like a shotgun move on their part. That's awesome.for you minus the boost.

335dsleeper · 11-05-2016, 05:40 PM

Trace the vacuum lines and ensure they're all connected and serviceable.

335dM · 11-06-2016, 08:26 AM

Boost starts at 2000-2100 rpm

335dsleeper · 11-06-2016, 09:52 AM

^ yea, your HP (small) turbo isn't making boost.

Grab a 10mm socket and flat head, remove your airbox and trace your vacuum lines.

JuiceQuadre · 11-07-2016, 02:42 AM

Just curious, do you simply feel the boost is gone or is some app/diag showing zero boost?
Im asking because i dont really know how to recognize boost below 2k rpms..
If i push it, it downshifts to higher rpms.. If i dobt push it am i supposed to still reliably feel the boost?
Sry im kinda noob in this

335dsleeper · 11-07-2016, 07:08 AM

Quote:

Originally Posted by JuiceQuadre

Just curious, do you simply feel the boost is gone or is some app/diag showing zero boost?
Im asking because i dont really know how to recognize boost below 2k rpms..
If i push it, it downshifts to higher rpms.. If i dobt push it am i supposed to still reliably feel the boost?
Sry im kinda noob in this

Yea man, it'll be very lazy. No power until the larger turbo kicks in. You'll notice it, it's very noticeable.

JOHNNYBRAVO1 · 11-07-2016, 11:02 PM

Quote:

Originally Posted by 335dsleeper

Yea man, it'll be very lazy. No power until the larger turbo kicks in. You'll notice it, it's very noticeable.

Injectors injectors, I went threw the same issue. My back 2 injectors were beat up and had rust around there bodies and 4 of the injectors had bad carbon.

335dsleeper · 11-08-2016, 03:53 AM

Well, I agree Injectors can cause issues but, serious boost lag is not Injectors. It's very obvious when the HP turbo isn't making boost.

Dazza335iC · 11-08-2016, 11:48 AM

Quote:

Originally Posted by JuiceQuadre

Just curious, do you simply feel the boost is gone or is some app/diag showing zero boost?
Im asking because i dont really know how to recognize boost below 2k rpms..
If i push it, it downshifts to higher rpms.. If i dobt push it am i supposed to still reliably feel the boost?
Sry im kinda noob in this

Ya I was wondering the same thing... I thought my car fast decently fast at 13.5@104 with a JR Stage 2 tune, but I've seen guys running Stage 3 with hybrid turbos in the 11s... makes me wonder if I'm getting full power?

JuiceQuadre · 11-08-2016, 12:04 PM

Quote:

Originally Posted by Dazza335iC

Ya I was wondering the same thing... I thought my car fast decently fast at 13.5@104 with a JR Stage 2 tune, but I've seen guys running Stage 3 with hybrid turbos in the 11s... makes me wonder if I'm getting full power?

Yea.. Well i guess this thread is about having literally no boost (turbos not doing their job) so i suppose that very noticable as these engines are probably very turbodependant..

What you might or might not have could be just some boost leakage.. ?
(But from what iv gathered slower time might be caused by million different things so...)

captpilly · 11-09-2016, 09:33 PM

Have you checked your red charge air hose?

11-04-2016, 04:16 PM	#1
335dM Major 139 Rep 1,363 Posts Drives: 335d m package Join Date: May 2011 Location: montreal iTrader: (0)	Low end boost gone Just got my car back from dealer after 2 months! Under warranty New head 2 new turbos New intercooler Now no more low end boost! No SES ?????
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11-04-2016, 05:16 PM	#2
kydiesel35 Lieutenant 168 Rep 460 Posts Drives: 2016 X5 35d Join Date: Jun 2015 Location: KY iTrader: (0) Garage List 2011 BMW 335d [0.00]	It's your vacuum lines. Refer to Yozh's threads.
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11-04-2016, 06:14 PM	#3
TorqueAddict Lieutenant 172 Rep 494 Posts Drives: 340i - 335D Join Date: Oct 2013 Location: Barrie, ON iTrader: (0)	Ya, probably they did not put the vacuum lines back in place correctly - or - one of your vacuum solenoids is bad. __________________ JR Auto tune and Bohl Diesel Downpipe - KWv2 coils - Apex Racing 18" EC7 wheels wrapped in Michelin PSS 245/275 F/R - Zimmerman cross drilled rotors F/R with Hawk HPS pads - SS brake lines - Motul RBF 600 - ADD W1 oil catch can - BMW performance CF spoiler
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11-04-2016, 09:50 PM	#4
BB_cuda Brigadier General 796 Rep 3,572 Posts Drives: 2011 335D Msport, 2013 X5D Join Date: Nov 2011 Location: Clear Lake, Texas iTrader: (0)	2 months and they didn't catch this after getting back together. You might consider a different service dept.
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11-04-2016, 11:57 PM	#5
335dlci Lieutenant Colonel 303 Rep 1,606 Posts Drives: 335d Join Date: Apr 2014 Location: Socal iTrader: (0)	Why was your car at the desler for 2 months?
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11-05-2016, 08:24 AM	#7
BB_cuda Brigadier General 796 Rep 3,572 Posts Drives: 2011 335D Msport, 2013 X5D Join Date: Nov 2011 Location: Clear Lake, Texas iTrader: (0)	Wonder what happened to the head? I mean where it is now
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11-05-2016, 05:40 PM	#9
335dsleeper Banned 394 Rep 1,622 Posts Drives: 09' 335d 10'35D Join Date: Dec 2015 Location: Suffolk, va iTrader: (0)	Trace the vacuum lines and ensure they're all connected and serviceable.
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11-06-2016, 08:26 AM	#10
335dM Major 139 Rep 1,363 Posts Drives: 335d m package Join Date: May 2011 Location: montreal iTrader: (0)	Boost starts at 2000-2100 rpm
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11-06-2016, 09:52 AM	#11
335dsleeper Banned 394 Rep 1,622 Posts Drives: 09' 335d 10'35D Join Date: Dec 2015 Location: Suffolk, va iTrader: (0)	^ yea, your HP (small) turbo isn't making boost. Grab a 10mm socket and flat head, remove your airbox and trace your vacuum lines.
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11-07-2016, 02:42 AM	#12
JuiceQuadre Second Lieutenant 58 Rep 222 Posts Drives: E92 335D 2006, F30 335i 2014 Join Date: Oct 2016 Location: EU iTrader: (0)	Just curious, do you simply feel the boost is gone or is some app/diag showing zero boost? Im asking because i dont really know how to recognize boost below 2k rpms.. If i push it, it downshifts to higher rpms.. If i dobt push it am i supposed to still reliably feel the boost? Sry im kinda noob in this
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11-08-2016, 03:53 AM	#15
335dsleeper Banned 394 Rep 1,622 Posts Drives: 09' 335d 10'35D Join Date: Dec 2015 Location: Suffolk, va iTrader: (0)	Well, I agree Injectors can cause issues but, serious boost lag is not Injectors. It's very obvious when the HP turbo isn't making boost.
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11-09-2016, 09:33 PM	#18
captpilly Enlisted Member 2 Rep 31 Posts Drives: X5D Join Date: Jul 2016 Location: MN, FL iTrader: (0)	Have you checked your red charge air hose?
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