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Originally Posted by sp00ln
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I read over a bit from those links but not in any great detail. All I saw were arguments that mirror Kevin's as to why *you shouldn't* put it after the turbo. The only argument to put it after the turbo was the one that you already proposed. We're those links supposed to refute Kevin's points?
The bottom line is this: on a WRX, #3 runs hot, so why not sample that one in particular? If your gauge and probe can't handle those temperatures, then you have
the wrong gauge for your car. I guarentee you that placing a probe after the turbo will mean a huge variety in temps... you say "just figure out what's normal and look for changes", but on a cold day, with 20deg air flowing from the hood scoop, over the turbo, and down the DP, you'll be cooling everything off quite a bit, in which case "normal" will change depending on the weather. Meanwhile, a probe in the cast iron header 3" from the block will be much more insulated from external factors.
Autometer makes several EGT probes. If you get the race quality probe (the more expensive one) it will read temps up to 2000F. Granted most Autometer gauges only scale to 1600F... at least you don't have to worry about breaking the probe due to overheating, and you know that the accuracy won't be too haywire at 1600F. (Actually, when I had my Autometer EGT in the header, I *never* saw temps over about 1550F anyway.)
Also, it's not like there isn't a catalytic converter and the factory EGT already in the up-pipe before the turbo. I'd be much more worried about the pre-cat failing and blowing throught the turbo due to the altitude induced rich conditions we live with than an EGT in the header.
So basically the only reason to put the EGT probe in the DP is to "protect the turbo", when it's already at risk from the cat and factory EGT. I'd rather get accurate readings from the lean cylinder.