Dud VT Maybe??

[lout]

check throttle body is fully opening with accelerator to the floor, difference in top speed indicates a drop in horsepower

 

[DUBHSTATO]

shift it from 1,2,3,D manually, the car should override at 5,500 so leave it in 1'st, let car override to 2'nd, click it into second and wait till it hits about 4000, then let it sit into 4th, and back on the accelerator.
i have about 1km strip down the road from me, and it my wh luxobarge can hit 185km/h and my mates vt can hit 200km/h theres no reason for it...

also try with power off, it lets the engine rev lower witch is where the tourqe is, like in 4th it should sit right on 400 with 3/4 throttle, thats what i do