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.
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.
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.
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.
I've made several, just buy some bends, a flex section and a cat.
Like I said before, the aft-cat O2 sensor can be relocated to run down the back of the block and you won't have any issues with the wires reaching.
But, if you don't have a welder or someone who will weld it up for free then you really aren't going to save much versus buying one that is pre-made for a 9-3.
it wound up working out good rerouted the o2 and it was fine. making the pipe wasn't too difficult. used two u bends some straights and a cat. still had a few bends left after but i plan on running a full three inch so i will wind up using them. i still wish i had the money for the gs dp. oh well
all i plan to do for now is paint it with a high temp silicone based paint and maybe wrap the section next to the oil pan. haven't decided on the wrap yet though
so its all fone sounds great. got it all the way down to a side exit exhaust for now. once i buy a few more bends it will come out like stock
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