1800 zvh FRST 195 chip, beiges, 8/9psi boost, piper cam and pulley (possibly)

it wont rev past about 5k.. now i think my rev counter is right...

you know when youre in say a standardish car and youre accelerating for maximum speed in 5th... and the revs just won't climb anymore... well thats what im getting in virtually all gears. (cant control in 1st at that revs to check and 2nd is bit dodgy)

it just wont build over that....
no rev limiter or hard cuts seeming to cut in... just seems to virtually stop??

any ideas?

cam timing maybe? or is something fundamentally fooked somewhere? (its very strong from 2.5k to 4.5k!! loads rev range! lol)