After finishing my manual conversion i have come across a problem. My car now goes harder at 3/4 throttle than at full throttle. At full throttle it feels like it's holding back. Its a 32 GTST with RB20DET. It just has basic mods; front mount, 3" turbo back exhaust, R33 turbo, air filter, splitfire coil packs and a remapped chip in standard ecu. Currently running 11 psi.
What is likely to be causing my problem? When it still had the auto in it, the further i pushed the pedal the harder it went... but that is no longer the case!