Issue with car after jb4 and catless downpipe, any ideas?

F22santiago · 08-25-2016, 11:35 AM

So I went JB4 (map 2) on my 228i (n20) a year ago with no issues whatsoever, love the extra power car pulls strong. A few months ago I also went with AFE catless downpipe. Love the sound and definately feel the extr torque. However, my car now "sputters" a bit when wot on higher gears (i.e: highway pulls). No faults are thrown at all and after 5k rpms or so it clears up. I noticed it seems to happen when its colder so I am assuming it has to do with a fuel and air ratio or maybe overboost (had a similar problem on my turbo saab until i got a dyno tune). So anyone here have any idea what this could be?

Luminous · 08-25-2016, 01:21 PM

Quote:

Originally Posted by F22santiago

So I went JB4 (map 2) on my 228i (n20) a year ago with no issues whatsoever, love the extra power car pulls strong. A few months ago I also went with AFE catless downpipe. Love the sound and definately feel the extr torque. However, my car now "sputters" a bit when wot on higher gears (i.e: highway pulls). No faults are thrown at all and after 5k rpms or so it clears up. I noticed it seems to happen when its colder so I am assuming it has to do with a fuel and air ratio or maybe overboost (had a similar problem on my turbo saab until i got a dyno tune). So anyone here have any idea what this could be?

Check your spark plugs

mike@x-ph.com · 08-26-2016, 05:14 PM

Datalog and send it to Burger Tuning customer support

08-25-2016, 11:35 AM	#1
F22santiago Banned 48 Rep 190 Posts Drives: Estoril Blue 6 Speed M240i Join Date: Dec 2014 Location: New Jersey iTrader: (0)	Issue with car after jb4 and catless downpipe, any ideas? So I went JB4 (map 2) on my 228i (n20) a year ago with no issues whatsoever, love the extra power car pulls strong. A few months ago I also went with AFE catless downpipe. Love the sound and definately feel the extr torque. However, my car now "sputters" a bit when wot on higher gears (i.e: highway pulls). No faults are thrown at all and after 5k rpms or so it clears up. I noticed it seems to happen when its colder so I am assuming it has to do with a fuel and air ratio or maybe overboost (had a similar problem on my turbo saab until i got a dyno tune). So anyone here have any idea what this could be?
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08-26-2016, 05:14 PM	#3
mike@x-ph.com Joint Chiefs of Staff 24055 Rep 190,575 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	Datalog and send it to Burger Tuning customer support __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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