914 Turbo Lag

My 914 has 400 hours on it.  I can normally go from idle to full throttle (5800 rpm and 40" MAP) without noticable hesitation. But just the other day, with full throttle on takeoff, the engine hesitated at 5500 rpm for about three seconds then continued to accelate to red line (or just under) rpm and MAP, then ran normally.  My local Rotax guy in Seattle said this was normal and was attributable to turbo lag.  But I'd never experienced a noticable lag before and I'm wondering if this is really normal.