Just clicked in my head once you mentioned that, thanks Vlad.

Yep. The sensors don't last long, obviously, so you install them for tuning and then remove them for regular use (like Dimitris has done). I have an AEM 4-channel controller but haven't had time to put it to use.

I also have 4 HBX-1 heatsinks in there now (I used to have the DIY copper heatsinks as recommended by Innovate, however they would crack on a regular basis due to vibrations), so the sensors last a little longer than expected.

Btw I do have the sensors installed on a permanent basis as I am always testing ECUs on my car.

EGT would be much more reliable, not to mention cheaper.

Ive been thinking of building a multiple channel EGT setup using some AD595 thermocouple amplifiers. Theyre kinda of expensive pieces of silicon (~$15 each), but not much else is required to build it, and thats still nothing compared to widebands.

EDIT:
Another cool thing about EGT is that you can see detonation.

You can see exactly zero det from EGTs. Ask me how I know.

User error I think.
Its probably useless for catching detonation while driving the car, but if youre logging it on the dyno you should see a sudden drop in EGT when detonation occurs. Unfortunately this is so counter-intuitive that people have frequently made the mistake of not interpreting the drop in EGT as a bad thing.

Dimitris, how much effort did you go to ensuring the EGT and WB bungs and the parts which block them when not in use do not impede flow?

I wonder if simply not protruding into the cylinder is enough.

Dann

Zero effort. This is my DD/mobile lab/track toy, so even if I lose 5hp because of the reduced flow, I don't care. :)

We saw nothing at 25psi on the dyno, AFRs were stable, EGT was stable, then poof, white smoke (ouch - hello, can I haz open window, stuffy in here blah blah blah.