BMW USED CARS

When you're starting with something as fantastic as
a RenaultSport Clio 197, it's a painstaking job to make sure you improve the
next model enough to make it appealing to owners of the current car, without
losing a shred of its brilliance. Renault seems to have succeeded with this new
RS Clio 200. We're breathing a collective sigh of relief around the office -
this little Clio is one of our very favourite cars.

Engine tuning begins with an admission and air release: the motor needs to "breathe". We put on an admission the filter of zero resistance, and for release at least direct-flow back to "bank". It is even better to establish completely direct-flow system, beginning from a collector to back "banks".

What filters happen

The air filter clears air before it will get to the engine. It would Seem, the purer air will get to the engine, the car work will be more powerful. But alas: the majority of racing engines, especially for professional racing cars, is not equipped with air filters. Filters create resistance of air on an admission, and the more resistance, the capacity of the engine is more strongly lost. Usual paper elements have the big resistance to an air stream because the filter material is very dense. Alternative – "0", filters of the zero resistance, a filtering which material — the cotton gauze passing without decrease of filtering ability at least on 50 % of more air, than usual regular filters.

Answers for five most common questions about the compressor.

Remember how you feel by completing a few dozen push-ups or run three kilometers of cross-country race. Approximately the same is the engine of your car when you drive up the hill, or "fly" on the highway.

More and more modern cars have "life-giving air, giving them an additional" force "from the turbo. Despite the fact that this unit was used in the automotive, aircraft and other engines for most of this century, only about ten years ago, turbo still considered only a "toy" for the "exotic" and "a particularly powerful" machines.

BMW has well and truly jumped on
the bandwagon with the latest Z4. The SLK might have had a folding hard-top
since its launch in 1996, but BMW was late joining the party. The 3-Series
Convertible only got one in the latest generation and now the Z has finally
gained it as well.

The bare figures are this: the
roof lowers and raises in 20 seconds, prices start at £28,645 for the 23i and
get to £37,060 for the 35i that we've just driven. Oh, and it'll do 0-62mph in
5.1 seconds with the dual clutch gearbox fitted.

Viewed
in its own right the
new Subaru Impreza WRX STI 330S is a bit special. The numbers are impressive enough:
325bhp and 344lb ft of torque. That's 29bhp and 44lb ft more than the standard
STI, thanks to a few engine tweaks and a big new exhaust from Prodrive.

It's £5,000 more expensive too, and a
full half-second quicker to 60mph. That makes it the quickest Impreza you can
buy without recourse to grey imports or dodgy men with spanners.

Big diesel saloons make a whole heap of sense: big torque
for cruising, decent mpg for range and enough bodywork to engineer out the
usual thrumbly NVH (Noise, Vibration, Harshness) issues that a compression
engine usually burps up. And right now it's impossible to ignore BMW's 535d
when it comes to being the sportiest, most dynamic diesel saloon out there -
it's the proverbial elephant in the diesel engine room.

Let's start with a simple truth: no matter what people say, you do not necessarily make a car better by making it faster. Ranges of cars, like sprawling cities, tennis rackets and drunken nights out, have sweet spots. Unexpected, near-perfect moments of goodness where the execution completely marries with the premise, where what you hope for unexpectedly becomes what you get. Want an easy example? The 2.7-litre diesel Jaguar XF with the six-speed automatic gearbox is one of these little moments of quiet brilliance, the gem of the XF range; fast, frugal, a bit swish, comfy, relatively affordable.

The Ford Ka's greatest weakness is the previous model.
Despite this latest version getting lots more fancy plastics inside, better
packaging for the rear seats and boot, and now a diesel engine, there's simply
no way it can ever exceed the heights the first Ka reached. Not with a chassis
as dull as it's got.