Last week I swapped my 4.11 diff to a 3.54. Before the swap my boost gauge was reading about 9psi max. My gauge only goes up to 15 psi and now I can peg it all the way to 15 psi. It is probably higher than that but I can't tell. I know my gauge probably isn't that accurate but can it be off by up to 5psi? Maybe a wastegate problem?
Does anyone know what type of boost level I should be seeing with a stock L28et, stock turbo, mkIII supra intercooler, stock fuel and ecu, 2.5" exhaust.