bmw e36 rev limiter problem (kicks in at 4000)

I have a bmw 316 e36 as a second car the rev limiter kicks in about

4000 revs. way down on previous up to around 6500 red line (not done regular). The car drives fine up to this point, this is a real nuisance when joining motorways or overtaking. does anyone know how to tweak reset or remove the limiter? or is there another problem attributing to this you could point out? many thanks