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Exhaust Gas temperature sensor

JamesO

JamesO

New member
I wonder if any of you with tuned Turbos have one fitted?
My wideband gauge (VEMS) has an EGT sensor and I have decided it would be a good idea to fit it as I will be tuning it, just not sure as to the best place. The crosover pipe would be easist but may be a bit far away.
Also what sort of temperatures should I see, I have generic figures somewhere but knowing what I should see on the 944 would be handy.

Cheers
 
I've wondered about this too, the exhaust temp will certainly have cooled a little bit by the time it hits the crossover. If you wrap the manifolds and crossover that will help. I guess if you choose the crossover you get the average temp of all 4 cylinders which may give you more information than just the temp of one cylinder. Maybe at the start of the crossover pipe would be the best place.
 
Thanks for the feedback, I'm toying with wrapping the exhaust but have heard negative things such as fire risk when the wrap gets oily, cracked exhausts etc. Not sure if this is just peoples theories or fact.
The crossover is looking likely as the probe will stick out a fair bit and space is at a premium around the manifold
 
I've heard that they can set fire when oily too :). But then lots of people wrap exhausts so..... Another option is ceramic coating. Probably be ok without wrapping though. Doesn't the crossover have some point already for a temp sensor. I'm sure I remember seeing one on mine.
 
The take off point on the crossover is for a narrow band lambda sensor for closed loop running. Not sure why the early cars that didn't have lambda sensors. Not sure measuring EGT at this point is any good for anything other than pure nerdy interest. It will have cooled by that point.

But what are you intending to use the information? Surely even measuring the EGT right at the exit of the cylinder head is of limited use? For tuning purposes are you not really interested in the temps in the combustion chamber when the piston is at TDC and the gas is at the highest compression and the fuel burning and temp the hottest? By the time the gas is ejected out of the exhaust it will have cooled significantly and unless you understand by how much very very accurately how will you use that information?
 
My EGT sensor is mounted where the sniffer tube used to go. I have never had the sniffer tube fitted on my car so not sure what it did but having an EGT sensor there works well. Its been a while since I had anything connected up to it as I only plug it in for testing/ tuning but it gave the expected numbers and is not far from the 4 header pipes. A lot of guys on rennlist have this setup so its tried and tested. There was a guy selling it as a kit a couple years back but they are all gone now.
 
On 944 -s i have fitted EGT sensor to crossover where 2 pipes goes to 1. In my opinion another place where to put egt sensor on 944s is where 1st and 4th cylinder exhaust pipes meet.

http://galerii.ecutec.ee/view_photo.php?set_albumName=album28&id=1_G

As seen on that drawing EGT is highest where engine pulses meet.
 
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