I recently got a 2007 379 w/ a c-15 converted to single turbo. It has only been bobtailed so far but I was worried about how high it revs when I’m floating gears. Seems to idle just fine, but in the high side I’m having to get it to 17-19rpm for it to fall out the hole to upshift when floating. I’ve been told it needs a tune which I don’t doubt it needs updated fuel settings. I’ve also been told this rpm issue would change when I’m hauling. Just came here to get some input and direction before I get this thing on the road. Thanks!
Cat c-15 high rpm?
Discussion in 'Peterbilt Forum' started by Dallison, Apr 1, 2021.
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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.Bean Jr. Thanks this. -
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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 movingLast edited: Apr 2, 2021
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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 rpmCoffey Thanks this. -
Coffey Thanks this.
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