I have no idea. :aiwebs_001:
Right now I'm planing to swap to a softer spring in the gate on the 38R so that I can put more load on the 47 without overboosting the truck. As it sits I'm running about 10 or 11lbs on the 38 and about 22 on the 47. I would much rather see about 30 or 35 on the 47 and about 5lbs on the 38.
The truck's power/plant your ass is DIRECTLY related to the first stage boost gauge needle. You can just look at the first stage boost curve vs the engine power curve on the dyno to verify what the seat of my pants tells me everyday.
When the 47 is making 30lbs and manifold boost is at 50 with the 38 making 6 or so lbs, the durated exhaust gas temperature after a full run at full load in the high gears is 1250 to 1300 flat.
When the 47 is making about 22ish lbs and manifold boost is at 50ish with the 38 making around 10 or so...the exhaust gas temp same scenario sneaks up to 1600 by the time you're finishing off the speedo.
I would probe the temps, but I just don't have room for any more damn gauges. I hate gauges and I've got two on the pillar, one where the ESOTF goes for auto T-case guys one zip-tied to the antenna, and one servo taped to the dash near the pillar. Course I guess at this point, in the name of temporaryality, I could just tape on another, lol. But I already know that the coolest possible scenario is with the 47 making as much boost as it can without overboosting the manifold dependent on how much the 38 is making.
Not to mention that the hellacious jet engine audio starts to get wicked loud once the 47 starts up toward 25lbs or more. When it hits 30+ you might as well be sitting on the hood of a mod class truck just as the sled takes off behind it, lol.
I know it's supposed to be about function....but damnit, there's something to be said about striking fear deep into the pants of every 5.9 owner within hearing distance when you come up on boost.