unplugged wastegate hose today in the gdi 4g93t just for experiment because its the only way i know how to dig up in it. Well, no boost gauge, im assuming on 1st it was probably reaching 14-15psi, but its one hell of a monster! Stock is like blah, nothing, does not feel like boost compared to whatever it did.
At 5500rpm or so, pinging did occur, so some steps need to be taken for increasing boost in these engines.
Only thing i can think i can do is, upgrade tank fuel pump, run a water/meth kit, a turbo that can handle plenty boost, but lets say 10-12psi for start but good spool on the 1.8 and some mixture of race gas. Currently i have 2.25" exhaust right thru with HKS barrel and resonator, mishimoto good sized intercooler, 2.25" intercooler piping, hks ssqv, and cone filter. Soon to install oil cooler.
Turbo choice would be an evo 3 stock turbo or a GT22 turbo by garrent, good for up to 280hp for 1.7-2.2L engines.
Imagine this engine with that turbo, 14psi, reflashed ecu, and the other mods.....should run sweet!