sadly welly, I don't think your idea of raising the bonnet will work at all.
From aero testing done on minis, it was shown that there was actually higher pressure at the back edge of the bonnet where the screen goes up, and a result, gases were actually drawn INTO the back edge of the bonnet rather than escaping!
That's most interesting actually dude, you any links to data? Would be an interesting read, I love things like that.
Anyway, two reasons I will be doing it still....
Now I've given this some considerable thought, the interesting thing is the slightly upturned lip at the back of the S3/A3 bonnet. In my mind, air rushing over....
Sod it, I'll draw a diagram...
That's my basic theory of how it would work, which is why I'd be grateful for any info you can pass on Prawn :thumbsup:.
Secondly, the majority of my heat build-up under the bonnet comes from giving the car a bit of beans, and then stopping. Now stopping being in traffic, or whatever, means that when I get going again, the UBT has gone up by many degrees from the heat of the turbo, heating the air up.
Raising the back of the bonnet up will at least allow the air being heated by the turbo to vent straight out through the gap, as it naturally will. I have proved this as a concept by removing the rubber strip at the back, and watching the heat coming out whilst stopped at traffic lights or the like.
Hopefully, this will greatly aid the effort to keep under the bonnet cooler, as the hot air is not being trapped after being heated by (a normally glowing) turbo...
Thoughts?