I’m new here and I have some questions.

[Rawze]

(01-16-2020 )Chamberpains Wrote:  

(01-16-2020 )Rawze Wrote:  they spike about 32 or so then fall back on their face again, exhaust runs hot and its real hard on the turbo if engine is driven hard like that.

Mine has done this ever since Mommaburt tuned it a couple years back. I told him about it and we monitored a few things with CT but nothing stood out. It'll spike at 32 and fall back to 28-26ish depending on how heavy and how much of a grade I'm on. I've never seen it drop below 26 on full throttle. It still gains speed and seems to pull just fine for 450 hp. But I rarely ever push boost above 20 so I dont know if this would be a problem for me. I've pressurized the whole engine with no leaks. I always figured its was just what they did. I don't run a pyro so I cant tell what the exhaust temps are. Anything else I should be looking at?

it needs to be fixed... no, it is not normal. It has been mentioned many many times on here... this is just one of those times, from back in 2016...

Quote:People think that it does no harm to unplug the EGR on a CM870 without having the ECM re-programmed,.. but it is in fact harmful. The turbo suffers the most.

Unplugging EGR = air-flow derates and lower then normal boost. It derates and drops it to 28-32 PSI max instead of the required 36+ PSI the engine actually needs for proper power. Because of this, EGT's will run a bit higher, and turbo is always running hotter, though there is no sensor or codes for it. A Pyro gauge on the outside of the exhaust manifold like in my gauge instillation videos will typically reveal that it is very easy to get it to 900+ degrees (red-line temp) when pulling hills and that will shorten its lifepan.

ref: http://rawze.com/forums/showthread.php?t...78#pid2278

... there are likely 2 dozen more references to this in the past, if someone looked hard enough.