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Did you ever get his truck back on the dyno for final numbers?Glenn,
Tom's truck is done, he is driving it and enjoying it. We have been chipping away at the current configuration on the shop truck and I'm almost at the conclusion that the heads are just too much to overcome above this level. What do I mean:
New HPFP is on the shop truck. New dyno shows 565lb/ft of RWTQ, still near 470rwhp SAE. No additional improvement in power. We had to go to medium wastegate springs to help with bleedoff (read: backpressure). Mike at MPT has been great to work with and we are trying to stretch the limits of what is possible but the "Turbulence Dam" cast into the stock head that restricts flow to 170cfm on the intake side is just too much to overcome. I fully believe these turbos can get us to 550RWHP, if the head flow was there. As it stands, they are working super hard to shove the air past the dam and above 4000RPM the turbos are working too hard shoving against the flow limit and not putting up extra power to the rear wheels. I hope that makes sense. One or two more things to try and then I can say we have definitively tried everything! My own restriction is 93 octane (E10) pump gas, no meth/E85 mix. We are close (reminder, we are at 12 degrees of timing and 17lbs of boost to hit the 470rwhp). It is not a big stretch to imagine that we could bridge the gap with fueling and cross the 500rwhp number, that just wasn't my goal![]()