Logger Tuning

[94Jettameowpsst]

Is it possible to get a good tune with just a logger? I mean, i know i have an afc and maf't to tune with but i just cant get it right. My fuel trims never move but when i do lean it out a bunch, its like when i floor it its sluggish till boost reaches my desired setting *say 15psi* then it just literally throws you back in your seat. My car was tuned like this before i took it to sbr to have it dyno'd and they said my part throttle was way lean, or "stoich". All the time my logger was still stuck at 81% l,m,htft. So, do i need a wideband to get it tuned right, cause im obviously not doing something right WTF

 

[94Jettameowpsst]

Well i figured out part of my problem. I knew this but i didnt knwo it really made this much of a difference. I put my pump in today and turned the boost up around 20 and what do ya now, the car runs like ass. The more i lean it out the higher the timing goes and the more knock i get but its still pouring black smoke out the exaust. I think i need a chip.....do they really make that much of a difference?