Ah ha. Good choice for a car. I call this the playstation 2 (PS2) car as all you have to do is to keep your foot flat ont he throttle and turn the wheel to steer just like how you play GT3 on the PS2.
The gearing you have on your car (assuming that it's either a 523i, 525i, 528i or 530i), you will only be able to clock anywhere between 230km/h to 235 km/h max. The only difference between the cars is the speed which you get there and also the speed where the steam runs off and speed start to build up at a slower pace. My old baby used to blast all the way to top without hesitation, only the gearing limits it from going faster.
Be a bit careful with the stock setup on our roads as it ain't no autobahn smooth and correctly banked. To compound the problem, the E39 masks speed so well that you don't realise how fast you are actually blasting until the unthinkable happens. Becareful with the E39, it's less safe than you think it is.
The best way to drive your auto is to leave it in auto mode and use the kickdown switch with a quick firm stab to overtake or "just for kicks". Steptronic is way too slow to be effective. I did a demo run from KL to Ipoh with a forumer sometime back with the car in full auto and boy, was that fun
. I think he lived to tell.
If you are doing a straight line combat, just stab on the pedal and let the autobox do the tricks otherwise you will find yourself left behind when the ECU deciphers your steptronic inputs. Approaching a sweeper and want a bit more torque to power through (a) if you want to go for it all the way, just kickdown and blast through. I demo-ed this to a forumer on entering a sweeper at 200KM/H and exiting at 230KM/H enroute Bkt Jelutong>Subang toll on that short 100m sweeper (B) not so extreme then push the lever to sports and it will automatically drop a gear for more traction and enough powerband to capatilise on to pull you throgh the sweeper fast.
If you want to drive fast, do up your suspension and brakes. Can advise if you need help
I do miss my PS2 but thank god for the alternative drugs but the PS2 will spoit you and make your balls smaller when you switch to an alternative drive as you will come to realise how much the PS2 hides speed and the "real deal" so it takes a while to realign your senses when you switch to a much raw-er machine as it is no longer just stab the pedal and point.