Having the following issue occur (boost dropping off) - I just wish to know wether it is normal or wether I need to upgrade something or have a problem I need to fix.
Car is an R34 GTT tiptronic auto.
Mods:
Turbotech boost tee set at 12psi (aftermarket boost gauge)
HKS cat back exhaust.
Now it dosn't matter wether you have the gearbox in "D" or wether you use the tiptronic, mash the pedal and boost jumps straight up to 12 psi (which is what I want) then drops almost instantly to 10psi, holds it for maybe 2 seconds or thereabouts before dropping off and changing gear. Car feels strong the whole time whilst accelerating (no misfires) but you do get a big backfire as it hits the redline and changes gear (but I have heard this is common in skylines) and probably unrelated.
Planned mods in the near future are dump/front pipe, hiflow cat, FMIC and SAFCII.
Thanks for any advice.