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2Addicts | BMW 2-Series forum BMW 2 Series (F22) Forum 2 Series Photos and Videos 14 M235i baseline to stage 2+ (dyno + Dragy testing/comparison)

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      04-01-2019, 10:23 AM   #23
designatedposter
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Quote:
Originally Posted by serrated View Post
not yet unfortunately. it doesn't seem to do it when it's warmer out so I'm suspecting that it might be running out of fuelling. (70+ F)

i only did the front 4 coils since the back 2 require removing crap to get to them. there's a tiny chance that it's one of those but i'm thinking probably not. we'll find out though!

worst case scenario i take it to a shop and have them take a peek
Why would you run out of fuel in lower Temps vs higher Temps?
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      04-01-2019, 05:45 PM   #24
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FWIW, I had the same issue on my '14 M235i with Stage 1 HEX/VF Reflash tune.

At the time when I installed the HEX reflash, I didn't realize the factory cold-side charge pipe was a weak point. This is my daily as well, so I just wanted to flash and be done with it.

About 5 months into running the reflash, I began developing the same exact high RPM hesitation you have described. Shortly after this started (~2 weeks) I had the factory cold-side charge pipe blow up and leave me on the side of the road.

It's possible that my hesitation was due to a failing charge pipe connection that was leaking. It seems you have replaced your charge pipe, but maybe it's worth re-tightening all of your clamps. I know from experience on other turbo cars I have owned, that I would need to go back and re-tighten all of my T-bolt clamps after a large variance in temperature from the time of the initial install. Basically, the piping would expand and contract, leaving a lot of slack in the t-bolt clamps.

Again, this may not be your issue, but might be worth it to check. I haven't had a single hesitation after replacing the factory charge-pipe with an ER charge pipe. It's been about 5 months now.



One more thing: It's very easy to incorrectly install the o-rings on the charge-pipe. They can also adjust during the install process and seat poorly. Might want to confirm these as well.


Quote:
Originally Posted by serrated View Post
not yet unfortunately. it doesn't seem to do it when it's warmer out so I'm suspecting that it might be running out of fuelling. (70+ F)

i only did the front 4 coils since the back 2 require removing crap to get to them. there's a tiny chance that it's one of those but i'm thinking probably not. we'll find out though!

worst case scenario i take it to a shop and have them take a peek
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Last edited by XCC Motorsports; 04-01-2019 at 05:52 PM..
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      04-04-2019, 10:49 AM   #25
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I have stage 2 waiting to be installed. I can't wait to see the difference. Went with upgraded FMIC, CP and DP.
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      04-11-2019, 11:35 PM   #26
serrated
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Quote:
Originally Posted by designatedposter View Post
Why would you run out of fuel in lower Temps vs higher Temps?
Colder air means it's more dense so it has to fire in more fuel to keep AFR correct. I'm making an assumption of course. It could be a lot of things
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      04-12-2019, 12:32 AM   #27
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N55 Stutter

Hello All,

I'll throw in my 0.02$ on the high rpm stutter,

It may a torque limitation map being reached, say the mapping only allows XXX Nm (gear dependent & rpm) The colder temps creates more torque.
(The Diesel TCU has a torque limitation map, and most likely the Gasoline too)
(the Diesel is limited in 1st gear)

From the video it seems like a torque modulation - possibly by throttle rather than the fuel cut/redline type of torque limitation.

Or the additional boost may create some type of compressor surge.
or wastegate management/feedback to oontrol torque/boost

/ideas off

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      04-12-2019, 08:18 AM   #28
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Quote:
Originally Posted by m3driver999 View Post
Hello All,

I'll throw in my 0.02$ on the high rpm stutter,

It may a torque limitation map being reached, say the mapping only allows XXX Nm (gear dependent & rpm) The colder temps creates more torque.
(The Diesel TCU has a torque limitation map, and most likely the Gasoline too)
(the Diesel is limited in 1st gear)

From the video it seems like a torque modulation - possibly by throttle rather than the fuel cut/redline type of torque limitation.

Or the additional boost may create some type of compressor surge.
or wastegate management/feedback to oontrol torque/boost

/ideas off

Regards,
Is this specific to the auto or are manuals affected as well?
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      04-12-2019, 10:17 AM   #29
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Quote:
Originally Posted by designatedposter View Post
for me, i was not able to remove the foam without loosening the strut bar and remove the plastic.. did you just tear your foam?

the foam has pockets which there are plastic posts that fit into them that keep them in place, so did you just tear it out?
No not at all, didn't remove anything aside from the plastice engine cover and coil packs. It was a lower profile snap-on wobble extension but otherwise it was tight, but got it out no sweat, I was surprised!
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      04-12-2019, 11:26 PM   #30
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Quote:
Originally Posted by designatedposter View Post
Is this specific to the auto or are manuals affected as well?

It is for the auto trans, where the software has a limitation in order to protect the clutches and/or case structure. In the lower gears the internal loads are higher. That is from reading the M57 diesel forum - 6HP28 ZF auto; but logic is most likely used in other transmissions.

The MT's don't have software, and haven't seen anything linked to torque limitations on MT's; though it can probably be implemented from the engine management and/or stability/traction control. So the MT's are more tuner friendly - ie rear diff ratio changes, stronger clutch, etc
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      04-13-2019, 03:17 PM   #31
serrated
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I wonder if there's a fix if that ends up being the issue
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