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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Feb-26-2014, 03:21:50 AM   #11
bzsbimmer
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Default Re: Extending O2 wiring for Section 1 with Cats

Yeah I think we got that buuuut... the CSL doesn't come with a cut wire loom so how is theirs run?
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Old Wed, Feb-26-2014, 04:09:42 AM   #12
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Default Re: Extending O2 wiring for Section 1 with Cats

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Originally Posted by trantamthien View Post
Here you can see he cut the loom towards the fuse box area. The wiring leads straight downwards in this area. This allows for more length to run along the side of the transmission tunnel here. Also, even before the sensor wires go into the loop, it's coiled up and tied up on the valve cover.



so you are saying he only uncoiled the wire from the loom on the head and cut the wiring harness cover back to the dme and then ran it straight down without physically extending it?




sorry im dense mate.
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You could make any wheel work with enough fender work, the right tire, and enough camber. Whether you are willing to go through that though is up to you. just say no to wheels that dont fit.
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Old Wed, Feb-26-2014, 04:28:34 AM   #13
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Default Re: Extending O2 wiring for Section 1 with Cats

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Originally Posted by bmwbob View Post
so you are saying he only uncoiled the wire from the loom on the head and cut the wiring harness cover back to the dme and then ran it straight down without physically extending it?




sorry im dense mate.
Correct. The coiled stock wiring is only unraveled to make it longer. There is no splicing or adding extra length wire to the existing cable. This should be enough to allow you to use the existing wiring for almost all applications without modification.
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Old Wed, Feb-26-2014, 11:25:40 AM   #14
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Default Re: Extending O2 wiring for Section 1 with Cats

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Originally Posted by m3e46freak View Post
Why do people think they need to cut o2 sensors?
Quote:
Originally Posted by bmwbob View Post
i dont see where he physically extended the sensor wiring?! unless i missed it.
I did not cut any wires, I only extended the OEM O2 wires that are located under the engine cover and enclosed in the factory looms.

The OEM O2 wires use different looms to go from the engine to the area behind the brake booster. They start in the hard plastic corrugated loom, through a soft rubber boot, into a hard plastic cover and finally through a soft rubber corrugated boot.





I only cut the hard plastic corrugated loom back to the soft rubber boot. I tried locating the loom with the hard plastic cover behind the brake booster but this still did not provide enough length for the wires to reach the euro bracket.

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Originally Posted by bmwbob View Post
also what kind of small bracket did you make? i cant see it in the pictures.. can you picture it so i can make my own?
I removed one of the mounting tabs and the 90 deg bend from the euro mount. I kept the straight part of the 90 deg bend since I purchased the cover and needed to use the two mounting tabs to attach it.



The bracket is just a piece or scrap metal bent to slide over the bracket and reach one of the existing studs on the transmission tunnel. I looked at attaching something to the mount but I didn't want any fasteners to get in the way of securing the O2 wiring. After a coat of primer I used a spare 'nut' to attach it.





Installed:

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Old Wed, Feb-26-2014, 12:23:52 PM   #15
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Default Re: Extending O2 wiring for Section 1 with Cats

^ WOW. better than the stock routing. i agree with you 100 percent that the stock mounting position for the o2 sensors seemed the lowest point.

i am sure thousands of euro cars havent ripped the o2 sensors from the exhaust system!! lol... but still i like yours much better!
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You could make any wheel work with enough fender work, the right tire, and enough camber. Whether you are willing to go through that though is up to you. just say no to wheels that dont fit.
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Old Wed, May-14-2014, 09:13:26 PM   #16
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Default Re: Extending O2 wiring for Section 1 with Cats

Bumping this up. Does anyone know how the wires are routed exactly on the euro car? The euro and us models (pre 2004) have the same engine harness according to realoem. So it stands to reason that we shouldn't have to cut the loom if the harnesses are the same. Do the euro cars route the precats differently?
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Old Wed, May-14-2014, 11:25:23 PM   #17
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Default Re: Extending O2 wiring for Section 1 with Cats

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Originally Posted by terraphantm View Post
Bumping this up. Does anyone know how the wires are routed exactly on the euro car? The euro and us models (pre 2004) have the same engine harness according to realoem. So it stands to reason that we shouldn't have to cut the loom if the harnesses are the same. Do the euro cars route the precats differently?
The secondary O2 sensors for EURO cars have longer wires than the US ones.

US
BOSCH/L=1075MM -> 11781406621
BOSCH/L=935MM -> 11781406622

EURO
BOSCH/L=1390MM -> 11787837564
BOSCH/L=1340MM -> 11787837565

The US ones will extend as the OP has shown but it is really close on the 935MM one. I did this on my Z4M. You can buy EURO ones from the dealer but they cost approx $300 CDN each, I asked.
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Old Wed, May-14-2014, 11:28:46 PM   #18
djm3
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Default Re: Extending OEM O2 wiring for Section 1 with Cats

Does this help? It's from a CSL.

ImageUploadedByTapatalk1400110018.353056.jpg
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Old Wed, May-14-2014, 11:39:14 PM   #19
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Default Re: Extending O2 wiring for Section 1 with Cats

Quote:
Originally Posted by Mirko View Post
The secondary O2 sensors for EURO cars have longer wires than the US ones.

US
BOSCH/L=1075MM -> 11781406621
BOSCH/L=935MM -> 11781406622

EURO
BOSCH/L=1390MM -> 11787837564
BOSCH/L=1340MM -> 11787837565

The US ones will extend as the OP has shown but it is really close on the 935MM one. I did this on my Z4M. You can buy EURO ones from the dealer but they cost approx $300 CDN each, I asked.
This is only true on the z4m. For the M3, the euro sensors are actually shorter.
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Old Thu, May-15-2014, 01:00:07 AM   #20
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Default Re: Extending OEM O2 wiring for Section 1 with Cats

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Originally Posted by djm3 View Post
Does this help? It's from a CSL.

Attachment 180624
I wish our us spec heat shield had those clips (or at least I'm 99% sure we don't). I tried zip tying them out of the way, and they just melted. Thankfully the O2 wire insulation seems to be able to withstand high temperatures.
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Discussing Extending O2 wiring for Section 1 with Cats in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)