ohhh man...this supra have very bad mapping !
pj not possible!
the old cars from j-style have all bad mapping ( nisssan z32, honda s2000... )
sorry but this can not fixed !
try it with a other car !
nissan silvia s14, s15
nissan skyline r31, r32, r33
mazda rx7 from backa
the second evo 8 from j-style ( here in dl section )
and much other cars have a good mapping but not this supra !