Speaking of sensors, I need lots of air temp sensors in my GTR setup. I could buy them, but I thought it would be more fun to assembly some. I really like the glass silicon diode based NTC sensors because the have very small thermal mass and thus very fast response time.

Back in the day I used a few Autronic air temp sensors that relied on the KTY/83 glass silicon sensor, and I have made a few using that same sensor. That part is now deprecated, but there are lots of similar sensors. For this particular application I picked the US Sensor 103JG1F, which is a 10k@25C J curve NTC sensor. They are $1 each, so cheap. The wire is M25579/16, 20 gauge. I should have used 22.

To make them usable I put them into a 1/8 NPT brass fitting and used epoxy to seal them up. 99.999% of you guys should just buy the air temp sensors from Tony Palo at T1, as he does a much better job, and uses a kick ass 1/16 NPT stainless steel fitting.

I’ll shrink wrap the wire side, put a DTM connector on each one and be good to go. Most of them have the temp sensor covered in epoxy, but I did make a couple with exposed tips. I’ll put one of each in my Subaru test rig and post up data comparing how they react. In my limited testing previously the epoxy made very little difference.

It is amazing how fast these respond to temperature changes compared to the standard GM AIT sensor (which is a ceramic NTC element). I’ll post up comparison data once I get my Subaru back on the road.