[325d]

Hi.

I would like to learn about EGT's.
I tried searching, but could not find much.
I read that one have to watch the egt's when a N57 is tuned, but I can not find much more info....

-What EGT is critical on a tuned N57?
-What EGT can you reach on a stock (not tuned) N57 in "extreme" situations like a max speed test on a hot day?
-How much lower will the egt be wit a PDF/cat delete?
-++

Thanks! :-)

[Yozh]

start here:

http://www.dieselpowermag.com/featur...rature_basics/

Google usually works well.

[glitdi]

High egt levels are usually a sign of a lot of things that are critical to diesel engine.
Exhaust gas temperatures will tell you if the engine the injection quantity and timing are off, it will tell you if your running to rich, and if you have maxed out your turbo, injectors etc...
To high egt can cause a myriad of damage including melting the pistons out of an engine, melting the turbo, damage to injectors etc..
A turbo makes power but its prime purpose is to evacuate heat and re-use the lost energy. A turbo converts heat into power, fuel is burned it is expelled past the turbo and then scavenged into power and fed more air. Cold air in helps keep egts, down hot air out helps bring cold air in, its a delicate balance. Fuel timing and quantity are key, diesel burns slower than gas so you only have a small window to burn all the diesel before expelling it. Engineers have spent years trying to balance power vs time.

The failure point in regards to high egt is in direct proportion to what metals are used in the engine, and turbo. Rule of thumb is less than 1400 degrees if I remember correctly.
A clean burning tune will result in lower egts and more power, pushing soot is typically lost power. You can get away with overfuelling up to a point, but for longevity and reliability your better off not doing this.
Read up on fuel quantity and timing in regards to diesels, also check out garret turbo's website, there is a lot of useful information there in regards to turbo spool maps which is critical to tuning a diesel engine. you need heat to spool up a turbo and a turbo to expel heat.
Your going to need to do a bunch of reading if you want to understand whats involved. Go to the library and get some books on diesel technology, try the physics section.... Good luck!!

[325d]

Thank you for your answers.
I was most interested in more information on what EGT's you reach on your stock and tuned N57's.
I think many of you monitor EGT, right?

Originally Posted by glitdi

To high egt can cause a myriad of damage...

I understand. But what is to high egt on a N57 (measured with stock egt sensor)?
I guess this has been discussed on this forum earlier (?). I can not find any info when i search.

Thanks!