Where do you install an Exhaut Temp Probe?

[chriso]

How far down on the exhaust pipe should I install my new exhaust gas temp probe. I've heard of people installing them in the #6 Exhaust mainifold also. While I have my "good" exhaust out I also want to install a bung for a wideband (to be purchased later on). So I need a bung for my temp probe and my future wideband.

 

[Yellow 13]

Dont put it #6 then your just getting #6 exhaust temp.

 

[WeDgE]

Mine is in the turbine outlet housing...just before the flange.

 

[hot dayam mk3]

i see many supra owners have there egt probe tap into #6 exhuast runner. #6 on the exhuast is basically the hottest side of the exhuast side. and tune with a wide band not a egt.

 

[souprat]

^^^agreed^^^ ether No.6 runner, collector, or could even mount it in the turbo right after the flange if you wanted to. NOT after the turbo, the info you would get from that is hardly useful. and yes, egt is a good thing to know, but should be used in conjunction with a WB to tune.

 

[SMP142]

how would the reading be useless after the turbo? if you have it in the #6 runner your only reading one cyl.

 

[souprat]

the cylenders are generally running about the same(lean rich ect). the #6 is usually the hottest. so you can figgure that whatever the #6 reads the others are alittle cooler(on the safe side) and the rest will be near what #6 reads. idealally you would have 6 egt gauges and probes, one in each runner. but i know i can do without that clutter in my car.
why not after the turbo: the turbo takes alot of the heat energy from the exhaust stream and uses it to turn itself an make boost. temps after the turbo can be 7-800degrees cooler than in the manifold. and the further away from the turbo you get the temps get even cooler, less acurate. imagine putting you egt in you muffler tips, where the exhaust is cool enough to stick you hand in the exhaust stream.
you can tell if you are lean or rich from combustion temps. so if you want to get an idea of what your combustion temps are you put the probe as close to combustion as possible, without anything interfearing with the temp reading(turbo).

 

[souprat]

been talked about before:
http://www.supramania.com/forums/showthread.php?t=14035&highlight=egt+probe

http://www.supramania.com/forums/showthread.php?t=8714&highlight=egt+probe

and a useful comparison between pre turbo and post turbo temps by someone who hade 2 probes:

http://www.supramania.com/forums/showthread.php?t=2028&highlight=egt+probe

 

[IHI-RHC7]

EGTs are essentially useless without WB.
Yes, you can make sure things don't melt. Which is good.
But high egt can mean many things, lean fuel condition, to little timing advance, so rich it's combusting in the manifold, etc...
We assume #6 is hottest, maybe it is, maybe it isn't. If #1 injector becomes clogged, I'd assume that #1 would be hotter, and #6 egt would say all is dandy, and you'd melt a piston/valve, etc...
As souprat Said, it's been covered, and after the turbo is pointless.
Putting an egt probe in the collector for the turbo gives you a good average temp to moniter, along with a good AFR. If the AFR looks good, and suddenly average EGT rises, you know that something is amiss.
Without individual EGTs you will never know which cyl needs attention, but it is a good tool to identify a problem.

 

[shaeff]

#6 is said to be the hottest because that's where all the EGR crap is. people with JDM motors don't have EGR, so TECHNICALLY, all the cylanders should be about equal. i'm putting mine in the collector, pre-turbo.

-shaeff

 

[lagged]

#6 is said to be the hottest because that's where all the EGR crap is. people with JDM motors don't have EGR, so TECHNICALLY, all the cylanders should be about equal. i'm putting mine in the collector, pre-turbo.

-shaeff

if you want to speculate, then number one should the hottest since its at the end of the fuel rail.

id put the gauge in the collecter BEFORE the turbo.