Yeh some stuff gets banned, usually because it already breaks an existing 
rule, or it would mean the cars would go too fast.  The FIA routinely bring 
in new rules to stop the cars going too fast - it's just dangerous.  There's 
plenty of invention that doesn't get banned though, it just doesn't make the 
papers because it's not very exciting.

> I wonder - how fast would the cars be able to go without all the 
> restrictions?

Well I would imagine they could easily make a car so that no human driver 
could survive the G force for two hours...

F1 cars already brake and corner at up to 4G, it would be pretty easy to up 
that to 7 or 8G and similar for acceleration if there were no rules.

Things which would make the biggest difference to speed:
- Larger engine capacity
- Turbo chargers (with no limit on pressure)
- No regulation on fuel type
- No minimum weight
- Moveable aero devices (ie like a plane wing that changes shape depending 
on whether it wants maximum lift or minimum drag)
- Wider tyres
- Stickier tyres
- Not as many safety features

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