RIP CM2250, 2013, 800,000km 20,000 hrs

[Rawze]

(02-08-2021 )Hermjeji Wrote:  So, can a bad turbo make 50 lbs of boost? The mech. said my turbo was gone, went and took a look at it as well, looks like it's got a decent bit of play in the lateral directions. Mech said he found a good used one, when he installed it, said the turbo was just spooling all over the place during startup, moving between 18-50 lbs of boost. I know these heads can't take more than 35+ lbs of boost (around there). My question is, can the turbo actually do this if it's bad? Or is something else going on.

I'm debating between a rebuilt or new turbo. But am just shocked that a bad turbo is making more boost than a good one? Truck is mandated.

if it was the wrong turbo then it can possibly over-boost.

if it was not calibrated properly, it can over-boost.

if the program in the ecm does not match the cpl of the enigne it can over-boost.

if the actuator is hanging up, it can over-boost.

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even so, sounds to me that someone does not know what they are doing. The engine cannot make 50+ lbs boost without throwing several alarms for over-boosting and turbo over-spooling.

BTW: there IS SUPPOSED TO BE SIDE-PLAY IN THE TURBINE!!!! -- THAT SIDE-PLAY SHOULD BE 0.045" OR LESS! ... DID ANYONE MEASURE IT OR DID THEY JUST GUESS LIKE A DUMB S$IT!??. ---== Was the housing chewed up? ===--?

just trying to help you make wise decisions any ways.

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also, if the engine is built right, you should not have to break it in on a dyno. Just drive the piSS out of it first few days and stay away from the highest engine brake setting for the first 50k miles. Have the valves re-adjusted in it after the 50k miles .. and then you can use the engine brakes on highest setting after that.