ISX 2350 485

[Rawze]

(01-21-2022 )Hermjeji Wrote:  CM2350, ISX15 550, 2015

Boost pressure measured several times, EGR tuneup completed, goes up to 38PSI. ECM was flashed with latest calibration a few years ago. This is from the factory sensor and not a secondary boost gauge. The truck is due for DPF bake and de-ash. However, i was looking at some data I collected a while ago when the truck was pulling some short 5-10% grades loaded in the city, what is the max turbo speed supposed to be? This one is getting above 100,000 RPM.

Also - did the overhead set a few weeks ago, same results afterwards. No axial turbo play, impellers looked good on the intake side.

first of all, that pic you posted makes no sense compared to your statement. --- looks exactly like someone stomping the accelerator in short bursts and then letting off it?. Are those seconds or minutes at the bottom of the chart? There is also unexplained data in it. - What little data can be read also is not that unusual for a non-deleted truck.

NEXT: The CM2350 max RPM rating of the turbo is 145KRPM mechanically, with a 120k settings for protection limits. 100k is below this, so I don't know what your trying to say.. H#ell... most Vg turbo will get to 80K even when doing a parked regen cycle. ... so if your concerned about the turbo spinning well within its operating limits.. then your worrying about zero nothing.


As far as the boost pressures on a CM2350 ... it is quite normal for the intake to get to 36,.. 38 psi when there is EGR gas present and the truck is not deleted. This is because about 4-5 psi (or more) of that IS EGR GAS PRESSURE that is coming back around into the intake, bypassing the turbo, and artificially inflating the intake pressures vs. what the turbo alone is providing. Again.. its absolutely normal.