Boost comes on from 2k up (I see ~2 psi starting at 1700). Anything above 3k and it picks up almost instantly. It is really hard to drive the car without spooling the turbos. Unfortunately, I put in used Sp500s (came on the front clip and were almost new) and they are burning some oil. I'm going to replace them this winter with ball bearing turbos. It sounds like I have the exact same problem that Medici has. I primed the engine though...
"the truth hurts like a big black cell mate and no vaseline" - BigTDogg (MA)