Exhaust Temp Gauge fitting

[BoOsTeD_RB26]

As the topic says,

Just curious as to where I should mount the sensor for an exhaust temp gauge. Should I get a nut welded onto the exhaust and drill it in from there, or should I just replace the factory temp sensor in the cat with the aftermarket one?

Any ideas?

Cheers

[Sydneykid]

Hio Boosted_RB26, the EGT sensor needs to go as close to the turbo as you can get it. Around about the Lambdas sensor position is my choice.

[Busky2k]

Your best off putting the sensor in the turbo manifold. Putting it after the turbo is not a true indicator of EGTs, since the turbo actually consumes a continuously variable amount of heat from the engine.

EG after turbo it might be 600C and in the manifold, it might be 900C.

[Sydneykid]

Hi Busky, where does the 300 degrees of exhaust gas temperature go? I have a ceramic coated (inside and out) exhaust manifold and we run a turbine cover blanket. There ain't 20 degrees getting out of my system, so 300 = no chance.

[BoOsTeD_RB26]

Is there any way I can easily fit it on a gtr?

Getting to the exhaust manifold is tricky enough as it is without removing a whole heap of stuff.

[Busky2k]

Sydneykid, some of the heat (kinetic energy) is used to actually spin the turbine, not lost to the environment. High pressure/temp into the turbine, low pressure/temp out of the turbine. That is quite simply, how it all works.

Go here for a quick read about it;

http://sr20det.nismo.org/basicsofturbos.htm

Quite interesting actually. And yes, 300C is very real. And so while you might have 700C post turbo, it might actually be 1000C at the exhaust valve, and thats risky! But the main problem is that you dont really know the temperature, as each turbo will subtract a different amount.

I have a webstage with real life figures if you still dont believe me. Heheh

[sewid]

Is there any way I can easily fit it on a gtr?  

Getting to the exhaust manifold is tricky enough as it is without removing a whole heap of stuff.

Put the car on ramps and fit it from underneath might be a good idea.

Thats how I would probably do it on my car.