portland2002
Full member
just tuned my seat leon cupra r bam engine.had the k04 turbo rebuilt with a larger compressor wheel complete engine rebuild inc intergrated engineering con rods.with full exhaust system inc tubular manifold and new n75 valve f type.when took it to get mapped on a dyno it holds 1.5 bar boost upto 3700 rpm then drops to 1.1 bar then on.even when dialed in 1.5 bar it will no hold it i think maybe weak actuator? i have checked for boost leaks tight as a drum anybody got any ideas?. power figures were 292 ftlbs at 3700rpm and 262.4 bhp at flywheel