part throttle boost?

[Bellic]

when im driving and put foot down car doesnt feel that quick like turbo dying out early,
but at part throttle car seems quicker and turbo just pulls strong, what could be wrong?

 

[Prawn]

i had that when i tried running an mbc after my remap. i didnt try upping the boost at all, just set it to peak at the same level the remap set it to.

didnt really work AT ALL, i got part throttle surging, and random spikes, and full throttle it really didnt feel very quick at all.....

very strange.

what about that J valve you got?

 

[Bellic]

put on j valve powers like smooth and power dies out early not agressive like the c valve , at first the i put the j it went into limp mode epc light came on switched ign on off then went ok ?