Boost pipes are all ok no holes, had new turbo fitted an recon injecters about month ago, pumps black smoke if rev'd to 3k+ even puts a black line on the road lol, had it on computer an no codes coming up, what would cause this?

 

egr valve?

 

overfuelling massivley

 

what could cause this mark?

 

possibly an injector stuck wide open, may not even flag a fault. i know from my younger years playing with 306 turbo diesels it was a case of no smoke no poke lol after turning boost and pump up! we used to get them to smoke like fuck on a straight road and turn them down little by little till the smoke went ha ha. my zx turbo diesel used to nail my mates rs turbo till 3rd gear with a nice cloud of unburnt skeg lol

 

oh and its marc lol

 

It cant be faulty its a BMW. There a miles better car than any other make of car.

 

i had the injectors checked tho?

 

I know you said you have checked boost pipes, but I'd double check them. It must be an air leak or over fueling.