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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 09-26-2008, 02:58 PM   #1
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custom making downpipe ?

i am currently custom making a 3 in down pipe and full exhaust for my 99 viggen. my ? is, is it ok to extend the o2 sensors wires to reach a new location? thanks
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Old 09-26-2008, 03:00 PM   #2
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i am currently custom making a 3 in down pipe and full exhaust for my 99 viggen. my ? is, is it ok to extend the o2 sensors wires to reach a new location? thanks
If you're talking about cutting them and soldering or something, you can do it, but if they are not done well, you may get improper voltage reading to the ecu which will affect air fuel ratio.
I would try to keep match the locations so you don't have to do this.
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Old 09-26-2008, 03:00 PM   #3
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how far away?
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Old 09-26-2008, 03:00 PM   #4
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I don't see why not...would they still be in the right locations?
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Old 09-26-2008, 03:07 PM   #5
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i would rather get a used one for $300, right jonny?
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Old 09-26-2008, 08:04 PM   #6
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they would still be in the same locations. its just the rear o2 is about 6 inchs back further now. i was planning on soldering them then heatshrinking the wires. also i like fabrication work and have all the tools to cut and weld it. so i decided to give it a go and make my own. the front bends were a lil tricky but i got them to work.
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Old 09-26-2008, 10:01 PM   #7
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i am currently custom making a 3 in down pipe and full exhaust for my 99 viggen. my ? is, is it ok to extend the o2 sensors wires to reach a new location? thanks

The way I read it the wire length is important to keep the right resistance and when you buy a universal bosh unit, they make a big deal out of making the wire length exactly the same as the stock harness.

That tells me the wire length does effect ohm resistance and that is how the ecu interprets a/f and egt and everthing else and its very important to have that part of the system working properly. I would try to keep it in a spot where the stock wire harness will reach.

John
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Old 09-27-2008, 02:15 PM   #8
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well i guess it is time to get the multimeter and soldering iron out and do a lil experiment.
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Old 09-27-2008, 04:15 PM   #9
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Can't you run the aft-cat O2 wire down the back of the block? Or is the wire still not long enough after that is done?
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Old 09-28-2008, 08:15 AM   #10
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once i get the downpipe bolted on i will try to reroute the o2 before anything and we will see what happens.
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Old 09-28-2008, 08:59 AM   #11
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I have been told that since O2 sensors are sealed sensors, the only way for them to release air pressure as the air expands inside them is through the wires. Soldering them may affect that and cause some other issues. Im not sure what. I thought someone made extension harnesses. Or why not try and make your own harness? Get a few matching sealed connectors, crimp the connectors in and try that.
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Old 09-29-2008, 05:31 AM   #12
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Bad idea to cut the 02 wires. Will cause problems down the road. You should easily be able to fit a cat in there and reach it with stock wires.
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Old 10-07-2008, 03:55 PM   #13
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anyone else tried to make custom downpipe?

lous' custom makes and fits it for ~$400
GS sells it for 472+shipping+my time for fitting=a lot of money

There are bunch of $40 mandrel bent 3" dp's for hondas on ebay. i'm thinking about getting one or two and welding it into a straight one, w/out cat.

or getting this integra dp below, welding extra o2 sensor and hoping it will be long enough for my ss exhaust

advices?


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Old 10-07-2008, 04:12 PM   #14
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my advice is buy one from gs, you won't be disappointed, and it takes like less than 30min to install
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Old 10-07-2008, 04:19 PM   #15
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Nicks piece is well worth the money, especially version 2 which for just a little bit more includes a flex pipe replacement.



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Old 10-07-2008, 04:22 PM   #16
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x2 she's a beaut
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Old 10-07-2008, 04:43 PM   #17
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too easy and too expensive for me, a college student.
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Old 10-07-2008, 04:48 PM   #18
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i can see too expensive, but too easy?
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Old 10-07-2008, 04:51 PM   #19
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well fitting it is easier than buying other dp and welding it to fit flexpipe.
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Old 10-07-2008, 04:53 PM   #20
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dont go buy a piece that is premade for something else. buy parts and weld them together yourself. it'll be just as much work with less headache
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