Cat c-15 high rpm?

Not seeing the issue. Why can't you drag the RPM down further before you downshift? Problem solved.

On that note, 1900 isn't gonna hurt a thing.

 

Halfass put your foot on the clutch when your pulling it out of gear...........then float it in....

Cats don’t like low rpms especially jacked up ones. Think Heat in heat out ,rpms keep the air moving

 

Try giving it some fuel, then pull out of gear as you let up on the go pedal.

1700 is a bit high for my taste, despite what these other guys are saying. (Yes it probably wont hurt it till about the 2k + mark, but stock setup runs good torque to 1400 and good hp to 1700 then each falls off pretty bad. If youve done much other than the turbo changeover, ignore everything i said, but my 3406e (485hp) and c15 (500 hp) are far happier at low rpm

 

Higher rpm means lower egt's, less carbon build up, less strain on the engine, more oil volume, higher cylinder pressures and less blow by. Yeah you may burn a tad bit more fuel but the benefits outweigh the cons in my experience. If I shift it like a 13 speed I shift around 1700, if I'm lazy and shift like a 9 speed I shift at 1900. You won't cause any damage till you're past 2100. To put it this way you'll cause more damage skipping oil changes on a cat than you would shifting at high rpms. When I pull hills whatever my speed settles at I drop a half gear and set my cruise with it at 1500rpm. Doing it that way for me keeps the engine from lugging, keeps egt temps down and keeps my uphill speed constant. Everyone makes it out to seem like cats are fragile pieces of styrophoam that need to be constantly lugged but most of the guys are not mechanics, they're a lot of the time rookies, and they have never pulled any serious weight at 120k plus pounds. The more load you put on the truck the more you'll truly see the higher rpms are a benefit. As well if you run low rpms on a worn engine it will accelerate bearing wear and cause more vibration and that can be catastrophic. Hope this helped mate safe travels

 

If you let the motor settle before letting off the throttle it has already broke torque and won't come out you have to have the forward momentum and then let off to get it to pop out, down hill it's the opposite you put pressure on it when the rpms settle it'll slide right out of gear then you can let off and shift up for smoother shifts going downhill, a big misconception is that low rpms is better but in reality the engine wants to accelerate, lugging it at low rpms while loaded causes a lot of vibration in the engine and will cause bearings to wear out faster, the crank damper can only do so much to stop vibration, lower rpms produces less oil volume, you may have the same pressure but a lot less oil will be fed, lower rpms produces a lot more carbon and unburnt fuel, it causes higher egt temps which is bad for the turbo and can cause warping and cause your turbo to blow overtime if the engine is properly tuned or defueled, yes you may get better mileage running lower rpms but me personally I'd rather get that extra couple hundred thousand miles out of the engine. I run over 100k pounds at times and I usually keep the rpms between 1500 and 1800, a lot of tanker drivers keep rpms high as well to keep up their momentum, another misconception or a lack of understanding is that the rpms don't affect fuel mileage as much as the load on the engine, you can run between 1200 and 1500rpm all day but if you got it to the floor all the time and drive fast you won't see any gains, the only time you'll really notice better mileage from low rpms is on flat grounds, the reason it gets better mileage is because your engine is struggling and isn't able to get enough boost built up, you'd be better off keeping the rpms higher and keeping your boost down, just my 2 cents