Exhaust gas Temp sensor location
 

I htought i had saw it once before but I searched on here and could not find anyting to help, anyone know the best location for the exhaust gas sensor location. I am installing the DEFI bf gauges and the book says in the header/manifold but I am eventually working toward the turbo so wont I have a new header/manifold? Ay suggestions? Thanks guys.


Chris

When you get the turbo and the new exhaust manifold, just reinstall the sensor in it...

That makes perfect sense, guess I was just looking into that too much! :) Now another question, I read that sometimes people install them on the downpipe. Knowing that i am going to turbo soon, should I install it on the downpipe or the manifold? Just wondering if anyone out there (sure they have) has installed one and if they have any tips for me. Any help is greatly appreciated!


chris

It doesn't matter from an accuracy standpont. EGT numbers are useless until you get them plotted in conjunction with a torque curve on a dyno.
That said, you need to take into consideration the range of the probe and meter.
If you are limited to 1600° F like most EGT gauges, you will not want to mount the sensor in the manifold near the ports. Rotary EGTs are very high and you might excede the limits of the gauge there, depending on the orientation of the probe.
I'd say to mount it near where the factory WBO2S is near the flange connection to the midpipe/CAT.

Thanks, I have read alot of you posts and you are the man! :) Does this make any sense to you, i am a little anal, so i decided to get all my gauges hooked up and working before I went to turbo, just so I could get use to how the engine runs stock and when i do have the turbo, if it does something wild I will know cause I have something to base it on. Also I am using the DEFI BF EGT, is that one okay with the rotary temps? Thanks so much for your help!

Chris

Yeah, the Defi should be alright. It goes to 1100°C, which is about 2000°F.

You always want to get all of your measuring gear up and running correctly before you start to make changes to the engine. I think you are doing it in the right order.
You should try to get a dyno session in before you install the turbo with all of the gauges hooked up and note the numbers.
That way, you will have something concrete to compare with as you tune the turbo setup.
At least get some good, hard, consistent drag runs or 4th gear street pulls.

so how hot does most of our rotary exhaust temps get?

I talked to a mechanic and he told me to have the sensor of the exhaust manifold gauge very near the turbine...I didn't clearly understand but he is a very rescectable mechanic and one of a kind so i ll trust him...

The mounting point will be affected by the available range of the EGT gauge. Rememeber - the actual number isn't important, only the relative number to the torque peak.
That said, installing it before the turbo would be most useful, but it is likely that you will be peaking the meter there.