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first turbo only boost 0.5 bar

1.7K views 10 replies 4 participants last post by  supra mkiv  
#1 ·
i have build my engine back to sequential mode from ttc mode.. i have noticed that the first turbo only boost 0.5 bar to 4000 rpm, and then the second turbo come online to 0.8 bar..

i have read that the first turbo should boost atleast 0.7 bar, before the second turbo come online..

i have checked all vacum lines, and they are fine..

i have checked the all 4 wastegate and they are Loose and can open ang close with out no problem..

the vsv there stand on the top closede to the second turbo, is that the one controle the boost on the first turbo???
 
#9 ·
i dont know but i still dont see a problem as long as the sequential system works.Just search on the forums for bpu mods or about what is required to up the boost. I later had mine boost to 0.9 on 1st and then 1.2 on 2nd until i went single turbo
 
#10 ·