probably, I think they mention 2 seconds before the impact, but of course without video footage we'll never really know.
I'd love to see some incar footage from Alonso's car.
So we can hear the sound. 'Cos Mclaren say that the renault telemetry suggest nothing.
Edit: I've just watched the video on the F1 site
http://www.formula1.com/gallery/race/2008/789/ (right hand side of screen) You can see that he clouts the upper wing on the first corner into the back of the williams, then half way round the first lap it flies off. So he did a half lap without the upper plain. So I would have thought that if it effected the accel' that much, he would have planted it into the back of Alonso before the incident....unless he wasn't close enough to pick up a slipstream under accel'.