O2 Simms with Stock Downpipes

dzenno · 06-20-2008, 12:21 AM

I'll be putting in the UR catless DPs on the car tomorrow and I mounted the O2 simms from Terry today. Just wondering, considering the DPs are not changed out yet, would there be any difference with the simms in terms of performance?

I drove the car after the install for a bit and it seemed like it had to adapt, initially seemed to have lost some power but then recovered again.

How do you explain this?

nj335i · 06-20-2008, 09:41 AM

Word on the street is that putting O2 sims in with stock downpipes will throw a code, which explains the symptoms you describe.

asdflkijd · 07-26-2008, 09:57 PM

I took out my downpipes at a perferred shop and drove home to take out the simms.. it was approx 80 miles of highway driving and didnt throw a code.... It shouldn't be a problem because with the o2 simms it just tricks your ecu into thinking you had cats..

Malek@MRF · 07-26-2008, 10:39 PM

Stock downpipes with 02 simulator will not throw a code.

You will be OK.

Good luck!

06-20-2008, 12:21 AM	#1
dzenno Banned 287 Rep 5,876 Posts Drives: Join Date: Feb 2006 iTrader: (1)	O2 Simms with Stock Downpipes I'll be putting in the UR catless DPs on the car tomorrow and I mounted the O2 simms from Terry today. Just wondering, considering the DPs are not changed out yet, would there be any difference with the simms in terms of performance? I drove the car after the install for a bit and it seemed like it had to adapt, initially seemed to have lost some power but then recovered again. How do you explain this?
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06-20-2008, 09:41 AM	#2
nj335i Modaholic 97 Rep 1,707 Posts Drives: with 3 pedals Join Date: Jan 2007 Location: East Coast iTrader: (7)	Word on the street is that putting O2 sims in with stock downpipes will throw a code, which explains the symptoms you describe. __________________ Euro Delivery - April 2007
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07-26-2008, 09:57 PM	#3
asdflkijd Aberry is a scammer 584 Rep 5,507 Posts Drives: SGM E92 335i, AM E90 335i Join Date: Jun 2007 Location: Seattle, WA iTrader: (14) Garage List 2008 E92 335i [10.00] 2007 E90 335i (Reti ... [9.00]	I took out my downpipes at a perferred shop and drove home to take out the simms.. it was approx 80 miles of highway driving and didnt throw a code.... It shouldn't be a problem because with the o2 simms it just tricks your ecu into thinking you had cats..
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07-26-2008, 10:39 PM	#4
Malek@MRF Brigadier General 740 Rep 3,732 Posts Drives: E92 M3, E46 M3, G82 M4 Join Date: Jan 2008 Location: Irvine, California iTrader: (5)	Stock downpipes with 02 simulator will not throw a code. You will be OK. Good luck! __________________ BMW PERFORMANCE SPECIALISTS. Race Engines. Suspension. F/I. Brakes. Race Preparation. Factory Service. Alignments. OFFICIAL PARTNERS: KW. MOTON. Brembo. AP Racing. BBS Motorsport. iND. HRE. Turner Motorsport. VAC. BMW Motorsport. Facebook \| Instagram \| Yelp! \| Flikr Phone: 949-233-0448 \| E-Mail: info@mrfengineering.com
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