Underboost issue :(

Olicox18

Active Member
Aug 9, 2022
19
2
Hey all, so I’ve got a Ibiza cupra 1.8t which is decat, oversize injectors all that stuff and it used to boost to 21-22 psi but a year ago I did the turbo which was replaced with a cheapy (my fault) so that died and I’ve just replaced it with an oe quality refurbished turbo but I’m still only boosting up to 14psi spike then it drops to 10-12 psi ? If anyone has any ideas I’d really appreciate it 😂 got a log through vagcom for the n75 cycle, expected and actual boost too
 

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