C15 High EGTs

Either a bad leak in cac or one of the turbos has failed. If the top turbo is shot chances are it damaged the bottom one as well. Also do you have stock mufflers on it? If so look for a restriction there.

 

You may hear it but it is very common for a leak not to affect boost. I am thinking like superhauler myself. If the temp gun matched the pyro at the time or close I would say pyro is pretty pretty accurate and you are getting hot

 

You wont hear a leak most of the time. Squire soapy water or windex on all conections at high idle 1500 to 1700 rpm. The cac you will have to pressurize. If it is original cac I will bet $$$ it leaks.

 

Only small boost leaks whistle and whine usually....larger ones just leak, if that makes sense. Your CAC doesn't need to be airtight, but it shouldn't lose more than 5psi in 15 seconds after being pressurized.

 

If your idling pyro temp is reading normal and not 2-300 high, and it agrees with your heat gun temp (what is your idling temp btw? Mine will be between 350 and 600 depending if I've just finished a tough slow down pull, or coasted to an empty stop) chances are good your top readings are accurate. In which case you might want to figure this out pretty quick before you have a melt down. You haven't really answered the topic of one turbo failing. My C15 is the single, so I'm not too familiar with the twins, but there has got to be a lot of guys on here that can speak to this. So you twin turbo guys, is this how it goes when that top turbo packs it in, high egts but no other real symptoms?

 

If the CAC and radiator are plugged with dirt, bugs, etc. then the air passing inside of the CAC can't be cooled down. A plugged radiator can cause an engine to run hot because air isn't passing through the tubes and fins.

 

post #12 says: Yes both water and oil temps normal