AlpineMSS Low RPM Catless X-Pipe Misfire/Torque Dip/Bog - RESOLVED

[tdott]

Update:
This issue has now been resolved. Alex says to request a new file and you'll get the latest changes.


There seems to be a growing number of cars with this condition, the majority seem to be on Alpine MSS tune from other threads on this topic.

Common modifications with this condition:
- Bimmerworld Resonated & non-resonated
- ESS with and without HFC
- Becker Headers/X-Pipe

Descriptions of the condition:

Originally Posted by MikeYQM

there was a frequent torque dip/bog. What happens is at around 2500rpm-3000rpm while increasing from about 30-50% throttle. Once it starts, the RPM hang and the DCT won't downshift in D mode. Almost like a misfire, but with no codes.

Originally Posted by fth001

I had this issue while running the BW Xpipe, Gintani Race rear, Alpine stage 2 tune, MT. Immediately felt a loss in power in that rpm range. It was VERY noticeable when trying to accelerate hard in 3rd or 4th gear from under 2500K. The car would start bogging down, if I backed off the throttle I would be able to get through it. If I held on the throttle, it would bog so hard that it would send my car into limp mode. I would have to pull over and restart the car to get going again.

Originally Posted by tdott

When I accelerate hard from a stop, when it hits ~2k-2.5k the car stops accelerating for a split second then goes again.

This is a video of Joshbot007 with the problem captured on video:

Thought it would be a good idea to get a list together to see who would be interested and if we can request some revisions/changes to accommodate this incompatibility.

I think most of us with this happening to our cars wouldn't mind paying a little extra to contribute to the development/R&D of a solution. So with enough interest hopefully we can get this done. We are all otherwise happy with our Alpine MSS Tunes and would like to keep using them.

Existing Alpine customers Interested / Willing to contribute:
1. tdott
2. bennylagoon
3. Spoff_E90_M3
4. Powashiftin
5. fth001
6. Scharbag
7. strokemycocktus
8. Audioslave686
9. V8Juice
10. nate122
11. dmlf
12. gh0stE92M3

Potential New Customers (with BW or similar xpipe and/or headers) who would be interested if Alpine MSS had a solution, having more interest couldn't hurt:
1. 6ixSpd
2. DJiGGs
3. CurbBender'90
4.
5.
6.
7.
8.
9.
10.

Once we have a good group of existing Alpine customers with this issue, I can reach out to Alex to get a response. The goal is to show that this is not an isolated issue with one or two cars, and that there is a need for a solution.

Logs that I have taken showing the issue using BMW Logger, you can see rpm flattens for a split second then increases evenly after this, while throttle is 100% the whole time and DSC is off. There is no stabbing of the throttle or on/off sequence. Just a gradual roll on, then increased to 100% and kept there.

The second arrow shows a dip in AFR ratio at this point. It dips to 0.84 then goes to 1, then works its way down a bit.

[MikeYQM]

Even though I went with the Epic tune and solved this problem, I've offered to continue to assist Alex in finding a fix for the rest of you. I've sent him most of my previous logs and data from when I was running his tune. I am still a paid Alpine customer.

That said, of course I'm not going to send him the Epic tune itself...

[tdott]

I believe the below members have mentioned in other threads they are experiencing this issue.

Tagging them here so they can express interest:
MShift
fth001
V8Juice
dmlf
CurbBender'90
Spoff_E90_M3
strokemycocktus
Audioslave686
bennylagoon
Joshbot007
fsmtnbiker
SupergluedGaspedal
nate122

[tdott]

Originally Posted by MikeYQM

That said, of course I'm not going to send him the Epic tune itself...

I don't think sending the file you have would be useful since it is read protected/encrypted.

[bennylagoon]

VERY interested. Thanks tdott 😉

[Spoff_E90_M3]

Definitely interested!

[Powashiftin]

You can add me to the list

[tdott]

I'll keep the first post updated. Thanks all.

[fth001]

Definitely interested, I still have my brand spankin new BW X-pipe sitting in my storage. I'm running my MS pipe right now but would love to give the BW pipe another chance if we can fix this issue.

[SYT_Shadow]

Good thread Trevor

[Scharbag]

I have also been fighting with issues with my Alpine tune. Rattle and clatter when I lug the engine right in the range of this torque dip. Would love to have the tune improved as well.

I am "special" because I have the Dinan ITBs... Regardless, hope that this can get addressed as I am also paid member of the Alpine club and would love to be able to rely on those tunes.

Cheers,

[Alex@Alpine]

I will get to working on this, you guys are all on 91? Correct?

[tdott]

Originally Posted by Alex@Alpine

I will get to working on this, you guys are all on 91? Correct?

Personally, I had this happen on both E85 and 93 files.

Others can chime in on their experience.

Thanks for jumping on this!

[Alex@Alpine]

Originally Posted by tdott

Personally, I had this happen on both E85 and 93 files.

Others can chime in on their experience.

What happens when you go stock file?

[strokemycocktus]

Originally Posted by Alex@Alpine

What happens when you go stock file?

I had this issue with stock engine software as well, the tune didn't change it in any way.
I ran RON 98 and RON100 tunes with the same results.
It seems 100% related to the x-pipe.
Stock xpipe + stock tune = no torque dip
ESS xpipe + stock tune/98 tune /100 tune = torque dip

tdott You can count me in for the tune update

[Alex@Alpine]

Originally Posted by strokemycocktus

I had this issue with stock engine software as well, the tune didn't change it in any way.
I ran RON 98 and RON100 tunes with the same results.
It seems 100% related to the x-pipe.
Stock xpipe + stock tune = no torque dip
ESS xpipe + stock tune/98 tune /100 tune = torque dip

You can count me in for the tune update

Okay I'll buy the x pipe put it on my car and get to work

[6ixSpd]

Glad to see a vendor step up and stand behind their tuning capabilities

If things get worked out, I'll have to grab this xpipe and tune as well.

[DJiGGs]

Posting for future reference when I pickup an xpipe next season.

Have alex's stage 2 with test pipes at the moment, and all is good. Glad to see him step out to help on this issue.

[Alex@Alpine]

Okay guys with my tune and this problem who want to be part of the test group please email me

Alex@alpinemss.com

Subject line test group 16.

I have the first changes ready to go & if Mike wants too try it too message me

[M43S7RO]

I have a bw race pipe paired with a corsa and stg 2 alpine tune, no issue that I've noticed but willing to contribute. Have had my tune for a few yrs now, is it possible the tune was changed at some point to cause the issue?

I have run the 91 octane file as well as +93 octane file occasionally with ~97 octane fuel, no issues.

[buldogge]

Are we tying the previously discussed "pinging"/bogging issue, when accelerating in too high a gear from <=2500 rpm to this discussion...seems there are some very similar variables/occurrences.

Anyway...I don't have a forward biased X-pipe...but I have Fabspeed HFC x-pipe, Fabspeed resonated mids, and Dinan back boxes with the Alpine Stg2 93oct (and Karbonius intake FWIW) and would be curious how the new tuning works in relation to what we previously were discussing.

-Mark in St. Louis

[Audioslave686]

Originally Posted by tdott

I believe the below members have mentioned in other threads they are experiencing this issue.

Tagging them here so they can express interest:
MShift
fth001
V8Juice
dmlf
CurbBender'90
Spoff_E90_M3
strokemycocktus
Audioslave686
bennylagoon
Joshbot007
fsmtnbiker
SupergluedGaspedal
nate122

Yup,
I have Bimmerworld X pipe and 93 octane Alpine Stage 2 tune
Pre-detonation on higher gears up to 2500 rpm