Originally Posted by JSchuricht
Your powerband doesn't really kick in till 1800+RPM. Are you seeing 10psi empty or while towing? Hills flats? Once your up to speed and there is little load, the boost will drop.
This guy is 100% correct, but he's wrong. CORRECT... you are dropping out of the powerband. But unlike the superduties, where the powerband is at 1500rpms for max torque, our trucks dont make torque until 2000rpms. Our OBS trucks make max hp at 3000rpms also. So basically, you need to spin these motors out to make power. Thats the nature of a V-Series diesel. They love rpm's.
Originally Posted by TOW RIG
its pretty consistent whether im loaded or empty. I was towing when I was having the boost drop uphill. Shouldnt it build boost under load all the time?
It seemed like it had the powerband effect like you said. any way to make that kick in sooner, or is that the nature of the beast?
I would like to learn more about hooking up the switch to the exhaust bypass valve like you said.
The truck cannot build boost if you aren't spinning the motor enough rpm's to lite the turbo. Like I said above, our v8 powerstrokes make max torque at 2k rpms, and max hp at 3krpms. These trucks need rpms.
No, there are
ways around this. A chip, first of all, when combined with an intake and exhaust, will fix a LOT of those boost issues. It will boost sooner, and boost harder. But a lot of people like to ditch the stock 1.15 exhaust housing and install a 1.0 housing. Some people will say it will cause higher egts blah blah blah, but it wont. I know LOTS of people on this forum running the 1.0 exhaust housing, and they love it. This housing will allow damn-near full boost between 1600-1800rpms. So a 1.0 exhaust housing combined with a chip, exhaust and intake would be a nasty combination.
It's an exhaust backpressure valve, and it's used to heat the truck up faster in the cold, and it's used to sustain oil temp when it's cold so the truck doesn't wet stack. The amount of flow-obstruction it provides is so minimal, I dont think it even shows up on a dyno (or its something like 5hp). I'd just leave it, or maybe hook it up to a 3way switch.