1600 F is too high. The maximum you should see on your gauge is 1500 F. Most of the gausges are up to 1600 and this also explains the 1600 max limit. Most engine builders recommend 1500 F. But this is measured before the turbocharger. Not at the dump pipe!

 

buy a wide band O2 sensor. This is the only safe way to tune. I suggest some form of knock detection that yoiu can monitor.

 

for those who mount the probe elsewhere other than the manifold,

i have my EGT probe about 3" from the turbo in the downpipe. you should be about 300 degrees cooler at that point in the system.

highway use = 1300 degrees

screaming = 1200 degrees

these are just the average temps i see daily.

there are some benefits to EGT in the d/p, one is that there are no modifications to the stock manifold (subaru is getting a little cranky about ANY mods )

this location will give you a reading of what's passing through the turbo

some guys like to meter the #3 cylinder, that's the best reason to put it in the manifold since the #3 is prone to lean conditions.

if you do decide to put it in the d/p, don't go for anything less that a a bung welded on by someone who knows that they're doing. it's a easy place to get a leak.

later, riggs

 

The best place is to install the probe before the turbocharger.

We never know how much heat is lost in the turbine wheel. As a result, in each turbocharger's exhaust turbine housing some heat is lost. How much? Donno. So, in order to be on the safe side insatall the probe before the turbo. Heat loss is relative, the longer the header pipes the more heat loss and seeing lower EGTs. This is a a bad case where one might think that he is on the safe side but in fact he may not be. Moreover, the insulation of the exhaust piping may change the heat loss.

 

if you're measureing the exhaust gases as they exit the turbo...........you're reading the temp of the gases in the turbo for the most part. this is just as good as reading the gases before they enter the turbo.

saying that heat is lost in the turbo doesn't mean anything...heat is lost everywhere from the time it is created.

if gases get too hot the turbo is done. you can read the gases coming out of the turbo and know whether or not they're dangerous temps!

it would be like mounting the probe in the up-pipe or the downpipe....it's a matter of very little difference.

even the fastest EGT gauges don't change very fast. you would see both of them spike if something went wrong.......whether you were metering before or after the turbo.

i think this is one of those matters that just get done a lot of different ways. i know just as many guys that mount the probes after the turbo as do mount it before. i guess it's kinda preference.

NOW, IF YOU'RE MONITERING THE #3 CYLINDER......THAT'S A DIFFERENT STORY

most guys tap the manifold cause they are worried about #3 running lean which is a common problem with the subaru fuel rail.

one last thought........if you tap the manifold........you're reading the gases as they exit the engine. they are going to be cooler by the time they reach the engine, so you're not going to get a very true reading if you wanna know the gas temps going into the turbo. so, with this in mind the best place for the probe is just before the turbo in the up-pipe. the difference between metering 2" before the turbo or 2" after the turbo are miniscule (SP?) so i had dan at godspeed weld my EGT bung into the downpipe between the flange and the O2 bung....it's about 2" from the flange........

works just fine........

if anything bad ever happens i'll know that the temps are climbing before they ever cause any harm.

later, riggs

 

oh yeah...........i'm not trying to be a smart *** or anything...but i have an idea.

AUTOMETER makes a kit for running 2 EGT probes so you can meter more than one place. you can set this up with one of two gauges i think.

it would be cool to meter the gases as they enter the turbo and just as they leave. that would tell ya how much heat engery is being lost in the turbo housing

if you wanted to get really crazy you could meter the #3 and the turbo......cover both ends!!! i think it would be easier to just run a fuel/air to watch the #3.....but that's just too many gauges.....it'll end up looking like T.F.A.T.F. got a hold of your interior

later, riggs

 

everyone i know says #3, but it's prob just a little confusion. it's the cylinder that gets fuel last on the stock rail.....and i thought that was the rear driver side......so maybe it is the #4.....beats me. i'll have to look into that one so i know what i'm talking about!

and about where to put the EGT probe...........they can be placed anywhere......it depends on what you want to measure.

i could stick an EGT probe down my dogs throat, but it's not going to give me a really good reading on the gas coming out his azz

you wanna measure the gases entering the turbo.......get as close as you can to the turbo. you wanna measure the exhaust leaving the engine.....get as close as you can to the engine exhaust ports

later, riggs