On paper, the fastest A2 is still the 1.6 FSI, with its 110 BHP.
In real life, there are plenty of chipped TDi's around that reach similar values. They have been chipped by Abt, Wetterauer (if you read the German forums on
www.a2forum.com) or mainly by UK companies (of course on this forum).
Whether a 110 BHP TDi outruns a 1.6 FSI is not a clear thing. Although the TDi will have a VERY serious advantage on the highway and on intermediate sprints (I mean, not from standstill), the FSI will be quicker in a sprint.
I think this all boils down to the gearbox. IMO the TDi has a very short first and second gear, meaning you lose lots of time shifting from 0-60mph (you have to go to 3rd for that). The FSI might just make that in 2nd.
Some more theory: if you go the Abt's website and look up the datasheet for a chipped TDi, you will notice that the 0-60 time hardly goes down. I think that is correct.
And for your information: a TDi weighs nowhere near 900kg. More like close to 1100. A big difference. Still lightweight for what it is, but not featherlight.
Personally I have this stretch of road on the ring near Alkmaar which I use to 'determine' acceleration. It's from a traffic light to a road-sign. I clock the highest speed to be reached at the sign:
My (old) 90Bhp, 900kg Honda Civic 1.5 16v made it to a 140km/h there. On paper its 0-100km/h time was 9.7 seconds.
My unchipped A2 1.4 75BHP Tdi, +-1100 kg, made it to just under 130. Paper 0-100 is like 12.7?
In chipped condition, my A2, now with 95BHP attains the same 140 as the Civic. Paper 0-100 according to Abt should still be around 12 seconds.
There you see that the TDi can pull away quite hard when at speed!
However, the old Civic always felt and sounded faster...
Are you going to have your new A2 chipped?
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(2003 Silver 1.4 Tdi Exclusive(SE), 95bhp/235Nm chiptuned by ABT, black interior, sport seats, heated mirrors, JVC KD-SH909RB cd-receiver, Infinity Kappa 63.1 + Vifa on-dash tweeters, 12" Subwoofer on 300w Amp)