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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > surging/flucuations while crusing in vaccuum



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      05-20-2012, 04:36 PM   #1
TT3 iN NyC
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surging/flucuations while crusing in vaccuum

Hi all,

I noticed that when I'm cruising, not in boost, the car feels jerky/surging/hesitating. You can actually feel the jerking/hesitation, sort of like it wants to pull.

This only happens when I keep the throttle constant, not giving gas, to maintain a constant speed limit. It doesn't happen while the car is idling or when in boost.

When I give gas, it'll go away but does come back sooner or later.

Anyone have any ideas what it could be? Video below

Thanks!

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      05-20-2012, 04:51 PM   #2
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Video is private.
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      05-20-2012, 05:05 PM   #3
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Quote:
Originally Posted by skinrock
Video is private.
Thanks! Changed to public
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      05-20-2012, 05:09 PM   #4
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What bypass/bov are you running?
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      05-20-2012, 05:11 PM   #5
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Quote:
Originally Posted by shiv@vishnu
What bypass/bov are you running?
Stett chargepipe with forged DV's
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      05-20-2012, 05:14 PM   #6
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Quote:
Originally Posted by TT3 iN NyC View Post
Stett chargepipe with forged DV's
I've run into this problem when the spring setting in the bypass valve is too soft and starts to crack open/close/open when cruising at a high enough RPM to make positive boost pressure when cruising. I solved it by running a stiffer spring (yellow). Do you know what springs you are running?
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      05-20-2012, 05:20 PM   #7
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Have you been using map 3?
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      05-20-2012, 05:26 PM   #8
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[quote=I've run into this problem when the spring setting in the bypass valve is too soft and starts to crack open/close/open when cruising at a high enough RPM to make positive boost pressure when cruising. I solved it by running a stiffer spring (yellow). Do you know what springs you are running?[/QUOTE]

Yup, I'm running the yellow springs. I'm pretty positive. I just checked the box, there is a set of blue and a set of green springs in there.
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      05-20-2012, 05:26 PM   #9
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Quote:
Originally Posted by Jeff@topgearsolutions
Have you been using map 3?
Not at all. I only use map 1
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      05-20-2012, 07:43 PM   #10
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Anyone? =)
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      05-20-2012, 07:49 PM   #11
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I have the same set up and the same issue. But I believe I am running the green spring, I'm gonna try a different one.
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      05-20-2012, 07:55 PM   #12
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Quote:
Originally Posted by Evelyn
I have the same set up and the same issue. But I believe I am running the green spring, I'm gonna try a different one.
Yellow are the stiffest? Or is there one that's stiffer?
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      05-20-2012, 10:06 PM   #13
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Which map/firmware are you running? The latest 4-23?
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      05-20-2012, 10:24 PM   #14
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Quote:
Originally Posted by badass335
Which map/firmware are you running? The latest 4-23?
Yup, latest 4/23 map/firmware. However, I made this video on map 0 (stock).
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      05-20-2012, 10:36 PM   #15
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i am noticing this too but what i have is if cruising at around 60mph at 2000 rpms with slight gas pedal pressure for awhile i see boost guage surge up like 1 psi or so quickly then back but not all the time.i have a tial bov with std spring no color just metal.maybe it could be that?Maybe get a harder one?
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      05-20-2012, 11:21 PM   #16
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Just curious if this happens on the 3-17 maps. I would suggest you try those and see if it happens?
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      05-21-2012, 08:07 AM   #17
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Quote:
Originally Posted by badass335
Just curious if this happens on the 3-17 maps. I would suggest you try those and see if it happens?
Even if it occurs on map 0?
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      05-21-2012, 08:20 AM   #18
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Which color springs do you have in the valves?
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      05-21-2012, 09:27 AM   #19
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Quote:
Originally Posted by Fedie
Which color springs do you have in the valves?
I have the yellow springs. These are the stiffest correct?
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      05-21-2012, 10:11 AM   #20
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Quote:
Originally Posted by Jeff@topgearsolutions View Post
Have you been using map 3?
what are the issues with this i never gotten a straight answer other then something about adaptations
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      05-21-2012, 10:37 AM   #21
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Will resetting adaptations resolve this issue?
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      05-21-2012, 10:50 AM   #22
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It's easy enough to do, give it a try
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