Micra develops "throaty roar"

*QUICK* sell it to a boy racer and tell them it has 200BHP, they will buy it! It is probably the front downpipe or part of the exhaust at the front/middle - start the car and try to listen about. It will get worse in time. There is a nice Micra on

Eh???

How do i work out the cruising speed on my modified citroen ax. I does 128mph (on the gps display .... the speedo needle hits the 0mph stop).

Maybe an equation is in order:

128mph/d²a,n/dt² = ( ( a,n+1 - a,n )/^x - ( a,n - a,n-1 )/^x )T/m= ( (^a/^x),n+1 - (^a/^x),n )T/m = 2mph

Surely you don't mean this. The above reads as though your maximum speed was 65 and is now 55.

That may well be it. You could, I suppose, run it like this but you'll be using more fuel and making more noise, so you're as well to have it fixed.

Exhaust is blocked- either the baffles have moved or the wadding has come loose. Either way this is wots reducing power. A 1 litre micra should be able to do a good 80mph anyways, so if yours is all out at 65 then its got a problem.

Tim..

When I say "cruise", I mean the car is pottering along nicely, without any apparent strain on the engine and returning a good mpg.

Its a 1.0, but can normally do 75mph on a motorway run quite easily, but with more noise than my "cruising" speed.

Bruce

Tim, Where are the baffles to which you refer? At the top/front of the engine? As I say, a screw has corroded there, but it doesn't seem loose or in danger of dropping off...

Thanks Bruce

In the exhaust. Try

only expensive bit's the cat & that's unlikely to be giving you a roar.