I just returned from a 1200kms drive on NH4 (Banglore - Belgaum - Kolhapur - Belgaum - Bangalore)
My car has done about 39k kms since I bought it 2 years ago, out of which nearly 30K kms must be on this highway alone. I know exactly where the road curves, exactly where every speed breaker is and exactly on which stretch people come in the wrong dircetion! In other words I am extremely familar with the road and how the stock car behaved on this road.
I had a blast driving the car on the highway. The Bilsteins have just transformed the handling, poise and road manners of the car. You just don't realise what speed you're doing until you look at the speedometer. I just can't describe that feeling of control you get at the wheel. All that torque starting from low down in the rev range going right up to the redline meant that I had some great fun on the highway. One big diffference is the tall and dead 6th gear which was good for cruising only, is now wide awake. Whenever the speed drops to 120 or 100 kph, just a dab on the throttle and the car races up to crazy speeds in no time. With the stock car one would feel the need to downshift to get back upto speed. There is a bit of an improvement in the top end too, but its the midrange that blows you away. The Belgaum - Kolapur stretch of NH4 is one awesome stretch and the moment some work came up in Kolhapur, I was literllay salivating. I had a run in with a big German car and it was great fun playing with some inflated egos.
For the Bangalore - Belgaum journey I tanked up with Speed97, just to see what difference 97 octane makes with the remap. Return journey was with regular unleaded 91 octane petrol. To be honest, 97 octane hardly makes any difference. THe car was pulling just as strongly with the regular 91 RON. Interstingly the car consumed more fuel for the Bangalore - Belgaum journey with 97 octane than the return journey with regular fuel, despite the fact that Bangalore is at a slightly higher altitude. My driving pattern was pretty similar with both journeys.
Here are some quick facts
Bangalore - Belgaum
Distance travelled : 510 kms
TIme taken : 5 hrs 25 mins
Avg Speed : 94 kph
FE : 9.3 ltrs/ 100 kms or 10.75 kpl
Fuel Speed 97
Belgaum - Bangalore
Distance travelled : 510 kms
TIme taken : 5: 36 mins
Avg Speed : 91 kph
FE : 8.7 ltrs/ 100 kms or 11.50 kpl
Fuel : Normal Unleaded from BP (BS3)
A similar drive with the stock car would give an FE of about 12 ~ 12.5 kpl. There is a slight drop in the fuel efeciency of about 1 kmpl on an average. A small price I'd say for the increased performance.
One thing that I noticed was that on regular fuel, there was a bit of jerky power delivery when you go wide on the throttle at around 2,500 rpm in 4th or 5th gear. It would then smoothen out past 3,300 rpm. This happened only when I would hit the throttle at 2,500 rpm and not at, say 3,000 rpm. I don't think this was there while the car was on 97 octane. A case of ECU needing some time to readapt to the 91 octane fuel perhaps?
I am running on fairly new front brake pads which have done only about 5k kms. They have bed in real nice and are very reassuring even with the increased speeds and power. In any case I am not one who cuts it real close and drives on the limit all the time. I have a habit of maintaining good distances with other vehicles. As such I did not feel any need for improved braking. Same with tyres. The 16" Michelin PLCs that I've got, though comfort oriented tyres, are very very grippy. Their grip has never let me down. In fact, I can barely remember when was the last time the ABS kicked in. I have done almost 40,000 kms on these tyres, and for a heavy and fast car like the Laura TSI I am amazed with the life of these tyres. Tread depth on each tyre is still more than 3mm.
I am in love with my car yet again and I've decided to pamper her with some more upgrades, albeit cosmetic. Let's see how it goes.