knock only on second turbo

[Mave]

okill change them for a set that i know are good, its just strange how i can take it to 7 k under light load and all is well, then take it to 0.8 bar up to 5k and thats fine as well but when i go onto the second turbo at 5k or above it throws a hissy fit

7k light load dosn\'t need as much fuel as say 5k + at high load, as its BHP that needs fuel, not rpm