This is my 08 BFII ghia. It started life as a stock NA car. I got a cat back about 8 months ago which was good for a little bit but I couldnt stand how rough the noise was. So it went back for hif flow cat and extractors. Now I was happy with the note but it didn't have the go to match. And I had an engine light from the extractors. So instead of getting a chip and tune I went down the forced induction path



The pics above are the completed original motor, the run in to canberra and back and with the new larger turbo fitted to it.
So far so good. Unfortunately the transmission just dosent want to play at all resulting in a motor good for over 400kw that dosent go anywhere. When we ran it to canberra and back the car was making 270rwkw and the drive was a nightmare. The box was stuttering from 1k to 2.8k rpm then was okay but taking up to 10 seconds to shift gears. At the moment the mechanic and I are blueing like cat and dog because I want the zf 6spd and he tells me im better off with a btr 4spd because its not electronically controlled or something. Either way it still needs a hardened gearbox better diff and a good tune.
Id like to know if there is any difference between a factory na ecu and a turbo one as far as tuning them goes becauee ive been told that tearing the ems out and tuning the factory ecu will solve the gearbox problems for now. When driving its stutters and wont change gear properly in manual mode. At the moment its running a rough tune and making around the 350rwkw mark.
If I sound a little less than well informed its because I am. I made the critical mistake of not knowing enough about the car and what was being done with it. Any advice or suggestions would be greatly appreciated because its been nearly 6 months and no result and I just want the car on the road
Thanks