2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > B58 Turbo Engine / Drivetrain / Exhaust Modifications > Should I get JB4 with my MPPSK?
Post Reply
Thread Tools Search this Thread
      02-27-2018, 12:21 PM   #23
BimmerPost Supporting Vendor

Drives: 2007 335i, 2015 M3
Join Date: Dec 2008
Location: N54tuning.com

iTrader: (90)

Originally Posted by bradsm87 View Post
No issue? In most tuner's books, no issue means no leaner than 12.5:1, no constant knock detections and fuel trims +/- 5%. Just because the car seems to drive OK does not mean no underlying issues. Any B58 JB4 on map 3 is going to be constantly riding knock detections unless you're running race fuel and it's still running the crazy lean factory AFR target. It's also going to have its fuel trims pretty much maxed out and likely completely maxed out in some spots. You're much better off running less boost and enabling it to run a bit more timing.
Its always good to log.. A log will show if any of the above is happening.

Takes a couple min to log. I always recommend that if running on the edge of what is recommended as each car is slightly different and fuel quality varies. Not all 93 is the same..

Appreciate 1
Post Reply


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 -4. The time now is 11:59 PM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
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