Are you running too high a boost and overspeeding the turbo? If so, then maybe T3 or VNT time.
T3 i would go for,mines off a 86 golf td,steam cleaned and fitted on my AAZ and its good fun and its used hard :wink: Bert
Dan i got some K26 around if you wanna experiment with?Duane
get me some of your specs and I might be able to hook you up with a new borg warner turbo charger. what kind of power you want to run, along with Nozzles, boost pressures, displacement and all that fun stuff.laterjkeiffer