proTUNING Freaks
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read

Go Back   BMW M3 and BMW M4 Forum > BMW F80 M3 / F82 M4 Technical Topics > Engine / Drivetrain / Exhaust / Bolt-ons / Tuning

Post Reply
 
Thread Tools Search this Thread
      06-19-2019, 01:28 PM   #23
Graves
Sicario
Graves's Avatar
Germany
781
Rep
916
Posts

Drives: 2018 M3 ZCP
Join Date: Jul 2017
Location: Bayern

iTrader: (0)

Garage List
So, not to revive the dead, but I just installed my BMS and the CEL came on today. Had it on the car for 4 days now. I'm wondering if maybe I need to rotate my pipe because it's hitting the MAF sensor and causing some sort of leak or disruption. Everything is tight as hell on the car. Check and rechecked everything. Thoughts?
__________________
Ryan King
2018 M3 ZCP
Appreciate 0
      06-19-2019, 02:44 PM   #24
Graves
Sicario
Graves's Avatar
Germany
781
Rep
916
Posts

Drives: 2018 M3 ZCP
Join Date: Jul 2017
Location: Bayern

iTrader: (0)

Garage List
Cable looks crushed a little, but it's still intact. Everyone I have spoken too thinks the MAF sensors just aren't seated properly.
Attached Images
 
__________________
Ryan King
2018 M3 ZCP
Appreciate 0
      10-22-2019, 03:51 PM   #25
calubi
New Member
2
Rep
10
Posts

Drives: F80 M3 Comp
Join Date: Aug 2019
Location: Ohio

iTrader: (0)

I just installed this intake over the weekend. The fitment of the maf sensors was a pain, particularly on the passenger side. The o-rings felt too big for the mount, and required more force than I would have liked to get the sensor to fit into the pipe. I ended up having to start threading the screws with the sensor mostly out and let the screws push the sensor in while cranking on them. Definitely not what I would have expected for a brittle plastic sensor.

My problem now is cold start idle. I have cold start turned off in BM3, and the RPM will hunt a bit at idle, occasionally dropping down to almost stall before shooting up over 1000 for a second. It only does that once or twice per cold start, and seems fine once warmed up. Unfortunately I did intake, spark plugs, and cold start delete/reset adaptations at the same time, so I can't say 100% it's the intake. But if it were the plugs, I would expect more than cold start idle issues. And the behavior is classic maf symptoms. I just hope I haven't damaged the sensors by having to really jam them into the mounts on this intake.
Appreciate 0
      10-22-2019, 04:32 PM   #26
Fuel-It!
BimmerPost Supporting Vendor
245
Rep
452
Posts


Drives: M4, M5, M2C, X4M, 440i, etc...
Join Date: Mar 2019
Location: Phoenix AZ

iTrader: (0)

If you are flashed your tuner can always adjust the MAF tables within the flash if you need to make compensations for cold idle.
Appreciate 0
      10-22-2019, 08:49 PM   #27
calubi
New Member
2
Rep
10
Posts

Drives: F80 M3 Comp
Join Date: Aug 2019
Location: Ohio

iTrader: (0)

I'm flashed, but only with the BM3 stage 1 OTS map. Is there anything specific I can log to verify its the tune vs a leak?

I plan on swapping back to stock intake just to make sure that's the culprit.
Appreciate 0
      10-22-2019, 09:35 PM   #28
Fuel-It!
BimmerPost Supporting Vendor
245
Rep
452
Posts


Drives: M4, M5, M2C, X4M, 440i, etc...
Join Date: Mar 2019
Location: Phoenix AZ

iTrader: (0)

I doubt it's a leak, but since the intake flows more air the MAF reading can be off. During cold idle when its not using the o2 sensors yet that can cause some cars to get a little choppy for the first 45 seconds until the car warms up and goes to closed loop mode.

I don't know if BM3 has adjustment for intakes built in or what but the table your tuner would change would rescale the MAF reading for the higher flow intake.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 12:22 AM.




f80post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST