bro abt the prob. i face it when i started playing IRO.. later i
realised that you have to ramp yr 3th gear to abt 10,750 RPM to
11,000 RPM then when you shift to 4th gear the RPM will be slightly
9,000 RPM cos after 9,000 RPM you can feel the pickup, and during
turns right, when you drop from 4th to 3rd, while turning.. keep
pumping the accelerator to maintain the RPM, it helps to drift
too.. practice a bit.. and also. hachi roku is very fast when you
do a drift at the corner with only the rear turning rather than to
crab walk..
hope this helps you
good luck!! 
