Had a small diesel dyno event local to me today. It was at an RV and industrial diesel type shop and they had a Taylor chassis dyno. I had never heard of one before. I guess its used for big rig type applications. How they run it scared the shit out of me! ha! Basically they run the engine up to redline and hold it there, then apply a water break load and bring it to full throttle at max rpm. Then they increase the load leaving it at WOT and drag the engine rpm down from redline, all the way down to above idle or whatever "normal" starting rpm would be, the whole time leaving it wide open throttle and the turbo screaming at max boost! It's scary hearing the engine drop rpm lower and lower and get down really low but the turbo is still screaming bloody murder at max boost pressure.
My truck nuts shriveled up into my exhaust pipe cause I was scared waiting for something to go bang! lol
I found out my turbo was only set to 35psi (suppose to be wastegated at 40psi) so I didn't have enough air for cooling under that much load so to keep EGT in check they had to let off the throttle to about 75% or so. I still made 485whp 975wtq through 33" tall mud tires and dually too so I'm spinning 4 of them.
That sounds about right cause I put down 525whp 1007wtq on a mustang dyno leaving it full throttle and a more traditional rev up through the rpm range like normal.
I'm gonna install a manual boost controller and set boost to 45psi where it should be and go back sometime and see what she'll do.
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Its just not the right setup for drag racing. I can sled pull though. Plus its just unbelievable to drive. I leave it set on max power all the time, even snow/ice. Its amazing how fast it pulls through a gear for a 8,200lb 4x4 brick!