Bigwheels32

Just the usual gear. exhaust, Front mount, boost gauge, boost T and turbo timer. Thanks heaps

Hi all , I've recently purchased an r32 skyline. It's spooling up to 4,000rpm and when it gets there its boosts. 4k seems really late to me. I've changed the spark plugs, wiring loom for coil pack and fuel filter. What could it be? Any help would be much appreciated. Thanks guys!