I just got the quad xzillaraider 2 with the race tune. I'm stacking with Bullydog. With quad off, my rp guage on the outlook monitor reads good, lil over 20,000 psi. But when I start bumping up quad, the pressure on the quad monitor, that plugs I to the sensor instead of reading from the obd, but the outlook starts going down to nearly 5,000 psi and the quad is still reading lil over 20,000. And the truck is starting to sound really loud when this happens.

Any clue? Is this draining the rail?

 

sounds like the quad is interfering with the signals sent from the ecm. the bully dog is reading what the ecm is being told by the quad or a false/low reading, and then the ecm since its being lied to by the quad is trying to ramp up the pressure to match where it should be. the quad knows whats its reading because its reading the actual pressure from the sensor, but the bully dog is reading what its being fed by the module

if that makes sence

 

Umm, alright. Sounds complicated. I've tried several different tunes. And they all make the truck sound bad and it starts shaking kinda at full throttle. Don't feel like trans, but I'm not sure. Well Bullydog on xtreme don't sound different, on the first level of 5 on quad, the engine starts to have a different pitch and shaking. I'm lost

 

could be engine knock, or rail pressure knock