Hi there,
Just in the process of finishing mods on R33gtst in order to get a tune (going for around 230-240rwkw).
Installed a Justjap 450 x 300 x 76 tube and fin - With the standard justjap piping kit.
Problem:
I have some missing at low rpm and low throttle inputs.
I have had this since I put the GCG highflow on but it is more pronounced now that's for sure.
E.g 2000-2500rpm up a hill in 3rd with 1/4 throttle input.
What's been done/checked:
I have T'd in to the BOV line for the boost controller.
At full boost/throttle there is no signs of missfire so I assume coils are ok, I put new sparkies in about 3000km ago.
I'm hoping the tune will fix this up - could the O2 sensor be causing this? I think it would still be in closed loop at these times.
Anybody had issues like this? The PFC was tuned for stock turbo, R34SMIC and 10psi.
Side notes:
Boost seems to be raised about 0.5-1psi and the stock AFM is maxing out quite a bit earlier. Feels a bit less responsive though
Also running no snorkel on the airbox and you get some wired noises...