Location of EGT sensor

[Clarkoh]

What effect does the location of the EGT sensor have on readings??

I have mine in the exhaust manifold, just before the turbo. I sometime approach 1400 on hills. Of course, I lock out the OD and take my time to get up the hills, after that. I pull a heavy 5th wheel trailer. The engine has the 16cm housing, Banks exhaust and K&N Filter. The engine will now make 17 lbs. of boost, with the stcok housing it would barely make 11 lbs.

 

[CDegner]

Your sensor is in the best location to get the reading you need (personal opinion). If you had your sensor post turbo, you would be reading 2-300 degrees lower. Granted, you could do the math in your head but this way, you look and see where you are at.



Opinions vary on this topic. This is merely my opinion. I'm sure you will get others.



Carl

 

[Clarkoh]

Thanks

Thanks. Is 1400 too high for a short period? So far, no damage that I can tell?

 

[Tim1]

egts

I think its too high!!! I try to stay under 1300 for any amount of time, however i can understand your situation with a automatic. I would look at opening up the ehaust to flow as free as possible and using a bhaf to get more air in the engine as well as cold air from the outside air. Just my 2 cents. Tim

 

[BushWakr - RIP]

I recall some good natured 'ragging' on nascar mark a couple years or so ago... . he was always hitting some ungodly temps...

I don't say much anymore since I hit 1700*F pre-turbo on a dyno run... ... yup, nasty.....



The generally accepted rule(s) are: 1200*F-1250*F all day with long cool down...

1350*F - 1 min. out of 5,. . no more...

1500*F - stand by for some really nasty thermonuclear event and the resulting entertainment for the passer's by.....

You can get away with a very short blast into those ranges but sooner or later... . it's all over but the rebuild. .



Pastor Bob.

 

[hdm48]

Pre or post turbo, it's your choice. But concider this, if you run it post turbo, by the time the guage tells you it's overheating, it's too late.

There are guages you can buy that do the math for you if you want to run it post turbo. But it will not respond fast enough.



In the engines that I build for race only apps, and you go past the 1200 degree mark on the Op-tach, the engine life is measured in seconds. Castor oil mixed with the fuel will help, but not for long.



In ideal conditions, the temp probe should be located 6 inches from the nearest exhaust valve face or begining of the port. This is called the "wet line". It's the same in all engines and is the most accurate location for exhaust gas readings.



And don't shove the probe all the way in. Just enough to expose the tip to the gas charge. Any more than that and your just blocking the port.



Dave

 

[Clarkoh]

Thanks, again

I pretty much knew that. I will be opening up the core support and adding some ducting to promote fresh cold air in. I am thinking of having the intercooler cleaned up too. 10+ years of corrosion, leaves, sticks and the remains of the paint cannot be much help either.



Is there a better down pipe (from the turbo) available for my truck? I have the Banks exhaust with a stock down pipe.