extending oxygen sensor wiring

BlakeNZ · Post by **BlakeNZ** » Tue Jun 17, 2008 9:48 pm

hi avenish, i have had my car's 02 wire extended (for my twin dump pipes). any auto electrician can do it. it is shielded cable.what turbo are you putting on?

avinesh · Post by **avinesh** » Tue Jun 17, 2008 10:03 pm

BlakeNZ wrote:hi avenish, i have had my car's 02 wire extended (for my twin dump pipes). any auto electrician can do it. it is shielded cable.what turbo are you putting on?

im putting on a dsr 430 which is suppose to be a close spec to gt30 40

BlakeNZ · Post by **BlakeNZ** » Thu Jun 19, 2008 9:31 pm

do you need injectors? i have some 550cc 2jzgte usa spec ones sitting here.

avinesh · Post by **avinesh** » Fri Jun 20, 2008 6:10 pm

BlakeNZ wrote:do you need injectors? i have some 550cc 2jzgte usa spec ones sitting here.

yea pm a price

avinesh · Post by **avinesh** » Fri Jun 20, 2008 6:12 pm

ok everything is in now but i cannot get the boost over 8psi i wana put it to around 11-12psi lookin at the turbo the actuator is closed when car is off so that seems to work but dunno why i cannot raise the boost more an also the bad thing is my oil return has a bit of a rise in it an then it goes down will this affect things cheers

NZ_AE86 · Post by **NZ_AE86** » Sat Jun 21, 2008 6:56 pm

It is quite clear that Matt is the only person who knows how an Oxy sensor works!

CRIMP ONLY as a lot of Oxy sensors breath through the cable - between the insulation and the wire.

sergei · Post by **sergei** » Sat Jun 21, 2008 7:36 pm

NZ_AE86 wrote:It is quite clear that Matt is the only person who knows how an Oxy sensor works!

CRIMP ONLY as a lot of Oxy sensors breath through the cable - between the insulation and the wire.

right...

The debate was more about the soldering vs crimp.
What set me off is that Matt stated that
1) soldering is a "high" resistance joint
2) voltage of the sensor is very low

neither of those are true.

I also stated that original poster could extend the wires and solder them together after the plug (loom side), without touching the original sensor wirings. Shielding is preferred, but not necessary as last ~30cm of the wiring is unshielded anyway.

Whether they breathe or what other reason why manufacturers recommend crimping is completely other matter.

matt dunn · Post by **matt dunn** » Sat Jun 21, 2008 8:42 pm

sergei wrote:1) soldering is a "high" resistance joint
2) voltage of the sensor is very low

neither of those are true.

what matt said was

matt dunn wrote:Oxy sensors work on such small voltage that the resistance in a solder joint, (and there is) can affect the accuracy.

In reality probably bugger all.

Dont see the word high in there,

and what someone calls low voltgae is always going to be up for debate.

JRS · Post by **JRS** » Sun Jun 22, 2008 3:05 pm

the reason for not soldering is the wire is nichrome and not coper and it can't be soldered with standerd soldering equipment (stuck togther /= soldered btw).

in addition, even if you used the correct soldering equipment i beleiev the joint can develop a significant voltage across it when the wires on the sensor side get hot. something to do with being two different metals nichrome and copper.

the crimp terminals with the 2 sets of tangs that are folded in are really good.

the crush type ones with the red/blue/yellow insulators are not as good but acceptable if crimped with a proper pair of ratcheting pliers.

NZ_AE86 · Post by **NZ_AE86** » Sun Jun 22, 2008 3:27 pm

Although he would appear to have it sorted I think your still missing the point of crimp connections on the Sensor wires - it is to allow the sensor to breath air.

MAGN1T · Post by **MAGN1T** » Sun Jun 22, 2008 10:13 pm

What a funny thread.

The only reason crimp connections are used is for time and money.

If you're doing the job for someone else, use crimps.

If you're doing the job for yourself, solder it.

The best way to extend it is to leave the sensor and loom both standard, get a plug and socket from a wreck and make an extension piece. That way when it $&#$% out faultfinding is easier.

Steve

NZ_AE86 · Post by **NZ_AE86** » Mon Jun 23, 2008 10:22 pm

MAGN1T wrote:What a funny thread.

The only reason crimp connections are used is for time and money.

Steve

Wrong.

MAGN1T · Post by **MAGN1T** » Mon Jun 23, 2008 10:57 pm

Your reason being?

NZ_AE86 · Post by **NZ_AE86** » Tue Jun 24, 2008 8:54 pm

An Oxygen sensor needs to 'sample' air from outside the exhaust. Some do this through one or more sample holes in the sensor body but others sample air through the wires - between the wire and the insulation.
When you buy a new Oxygen sensor the warning to only crimp is not just to waste ink - they do not want their product to give problems due to installation faults.