N55 Rough Idle W/ catless dp after JB4 ISO?

Gearhead327 · 06-05-2014, 10:32 PM

Quote:

Originally Posted by Jsoboti

I put my G5 board back to non-iso and it actually runs way worse. stalls absolutely every time i am stopped for more than 30 seconds. Whats your setup? what kind of DP? are you using mini cats or are your 02 sensors plugged straight in to the DP?

I'm running BMS DP with O2's plugged straight in. My JB4 is the latest firmware before ISO. Could it be the DME? Maybe yours is running a different version than mine. My cars build date is 8/11 and the DME has never been updated.

Jsoboti · 06-06-2014, 11:06 AM

My production date is 10/10 so you may have a newer DME version.

Took the JB4 off and she idles perfectly. What gives?

Mike@N54Tuning.com · 06-06-2014, 11:51 AM

The N55 with downpipes just idle rough. It's because they are set too lean at idle from the factory and the DP just makes them run that much leaner. BMS added a patch in the ISO firmware but it requires the FF connector. There are notes in the N55 ISO thread about the setting.

Mike

Jsoboti · 06-07-2014, 10:18 AM

Quote:

Originally Posted by Mike@N54Tuning.com

The N55 with downpipes just idle rough. It's because they are set too lean at idle from the factory and the DP just makes them run that much leaner. BMS added a patch in the ISO firmware but it requires the FF connector. There are notes in the N55 ISO thread about the setting.

Mike

So the FF wires with the proper setting will enrichen the mixture? Is there any other way to do this if the FF wires are not enough?

06-06-2014, 11:06 AM	#68
Jsoboti Lieutenant 28 Rep 583 Posts Drives: 2011 335i E92 M-Sport 6MT Join Date: May 2014 Location: Mississippi iTrader: (0)	My production date is 10/10 so you may have a newer DME version. Took the JB4 off and she idles perfectly. What gives? __________________ JB4 G5 ISO FF \| BMS Performance Intake \| BMS Wheel Spacers \| VRSF Catless DP \| Red CYBA Scoops \| Supreme Power Lowering Perches \| VRSF Charge Pipe \| VMR 810 19x8.5 ET35 19x9.5 ET33 \| Michelin PSS 235/265 \| BMS CDV \| BMS Clutch Stop \| 4'' Tips
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06-06-2014, 11:51 AM	#69
Mike@N54Tuning.com Joint Chiefs of Staff 5017 Rep 116,150 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	The N55 with downpipes just idle rough. It's because they are set too lean at idle from the factory and the DP just makes them run that much leaner. BMS added a patch in the ISO firmware but it requires the FF connector. There are notes in the N55 ISO thread about the setting. Mike
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