Cm870 low boost high egt

[Rawze]

(01-28-2026 )Oilysnowman Wrote:  

(01-28-2026 )Rawze Wrote:  what are you calling high EGT's?.

1000 Fahrenheit post turbo. Occasionally it shoots up fast to 1100 when I shift and that’s when it gets the pressure differential derate actually, then the the boost shoots up to 40 or just over and cools it down then the boost slowly drops back to 33 ish. It was some other derate just for egr that came on with the engine brake. Sorry got my wires crossed there.

That EGT is not excessive, but the boost going above 37~ish is.

1050 - 1100 F (post turbo) is the upper end of acceptability for the ISX under max operating loads.

what you describe almost sounds more like the arm is hanging up?.. is wonky?. etc. - that could be the turbo itself.
related info: https://rawze.com/forums/showthread.php?...8#pid54418