high altitude and turbos
FYI... I've spent a year learning how to get my PT54 to spool at high altitude (5200'). After following advice on increasing flow (high flow heads, intake, ported intake), and chasing every possible error, the end resolve is that the stall speed must be increased for altitude. My first increase was to 3200rpm and was still stuck at 2psi and no climb at 2000rpm when in brakestand. Now changed to 3800rpm stall and it gradually, I mean it takes 30 seconds to climb until the brakes/tires won't hold it (~5psi). You're at half my altitude, so won't be as much a problem. Looking back, I'd have spent the best money on a ball bearing turbo (spools easier, quicker). btw, reducing the A/R is another way to help (but hurts top end performance). Mine is at 0.63 and they don't make them smaller.
Suckin' thin air at 5200'