Cm870 low boost high egt

[Rawze]

(09-03-2026 )Wesoja2 Wrote:  

(09-03-2026 )Rawze Wrote:  

(09-03-2026 )Wesoja2 Wrote:  Has this issue ever been solved? I have the same thing going on with mine. Does it with EGR intact or demandated. RR also tuned my truck and we had this same exact issue that still has never went away

What are the EGT's, boost, etc?.

also maybe this post helps...
https://rawze.com/forums/showthread.php?...9#pid85889

...will not make more then 32-33psi above 1500 rpm’s and 1000-1100 degrees in a hard pull. If you pull it down around 1400 it’ll go up to 37ish and egts will come back down into 800-900ish.
...

1050 - 1100 F is not excessive actually... but the boost only going to 33 and holding is a bit low. Should be in the 36-37 range.

Most of the time when the boost does this (assuming for a moment there is nothing mechanically wrong) and the ecu is dropping boost, it is due to the auxiliary emissions systems being unhappy with the engine exhaust NOx levels, etc. - The reason for the boost or other derates/dropouts can be found by monitoring things via CT software on a test drive + recording the laptop screen as it is acting up.