84 Jetta 1.6td build question on performance

[zukgod1]

Hmm ok.

The problem I see with your placement is #1 and #4 are going to run different than #2 and #3 due to the nasty intake manifold's we have.

If you can you really need to move it directly under the turbo so its at the mouth of the turbo where all 4 cyls come together.

And that prob is TOO short.

I bet if you pull it out the tip may be black and thats it.

[dillenger1]

thermocouples get more accurate toward the point or end of the material.The thinner the probe the faster the response.So that would make the tip the best spot to aim for.

[zukgod1]

thermocouples get more accurate toward the point or end of the material.The thinner the probe the faster the response.So that would make the tip the best spot to aim for.

Not if that's all that's in the stream.  I believe 50% of the probe needs to be in the exhaust to get an accurate measurement.
Figure the way his is positioned hes getting maybe 1/4" in the stream then the reaming 3" is shrouded in metal transferring heat.

[1life2live]

I can move it to the middle but then ill have to fill the hole in the manifold. Not a big deal I just dont think its going to make a difference in less for some reason #1 and #4 were to have something drastic happen which in that case the gauge is only telling me what a catastrophic failure would tell me anyway. I have yet to find a longer probe to run and am thinking of cutting the bung off and taping the manifold so that the probe is farther into the stream. I still think the probe is malfunctioning and needs to be replaced. Oh and the probe is black all the way up to about and inch up from the tip

[zukgod1]

Drill and tap the manifold, you can use a pipe plug on the current hole. Easy stuff.
And you are correct it may not tell you more but why risk it when all it takes is drilling and tapping to eliminate the possibility? I suspect just moving it and tapping the manifold will help, that threaded bung you welded on looks to be at least 1/2", combine that with the length of the compression fitting and your way out there.