W124 dailydriver upgrade
W124 dailydriver upgrade
Alone at 120cc the 451 runs right up the middle of the map. Dougal ran some numbers over on 4btswaps. The thread rambles a bit, but you can pick out the best bits. On page 4 he runs the numbers for the 451 and we discuss using a bypass valve for the compressor side (I bought that one Alcaid used from the audi 3.0 biTDI but everyone I know who has tried it cannot get the passive compressor bypass to open, including that guy on here with the compound gwagen). Anyway I am going to run it with a wastegate on each turbo like yours and 50mm gates, and call it good. At 120cc I should not need the 451 wastegate, but if the hx30 compressor is obstructing flow then I will need to wastegate the big turbo and run the little turbo gate at higher pressure. If I want to turn the fuel up later to 150cc I will just turn the hx30 wastegate up to 60psi from 40psi and keep the big turbo gate closed.
http://www.4btswaps.com/forum/showthread...edes/page3