I recently moved out of a C15 379 and into an MX powered 386. So far I'm happy with it, but the engine brake seems to cut out around 1,200 rpms. Almost like going from stage 3 to 2. Is this common?
It feels like it's on stage 3 until around 1,200, then it feels like it kicks down to stage 2 on its own. It's a 2011
Normal. If you read the manual for your truck,it will show the rpm's in which the jake is most effective.
Without looking at the manual,max rpm is 2200 iirc. Downshift to use the jake is 1500-1600rpm. Depending on your gearbox. Below 20mph you don't really use the jake much.
I'm not much of a high revver lol it has an 18 speed. I usually upshift at 16 and downshift at 12, if I take a full gear. Half gears it's usually 14 and 16. It seems to pull better on the bottom end anyhow. Definitely different than a CAT!
Back to this, I've been messing around here and there with it. When I let off the throttle around 1,500 with the engine brake on, it seems like it works full force and really slows the truck down. After a few seconds, right when the turbo starts to spool, it cuts out. After it cut out, I switched it down to stage 1, then to stage 2 and 3 and there was no difference in engine braking power. Any ideas?
