Извинявам се, че го пускам на английски. Взето е директно от
http://www.carsfromitaly.com
1. The engine.
Before modifying the engine it is worthwhile filling it with a good quality synthetic oil and fitting new spark plugs. An engine oil additive may also be used.
The first improvements are relatively simple. The air filter can be replaced for an aftermarket item which will help the engine breathe more freely, the 'induction kit' (as they are known) type are the best - these replace the standard airbox to further help the breathing, and the exhaust can be replaced for one which will restrict the exit of the gases less. It is best to replace the whole system, and not just the rear section, for improved performance. Stainless steel systems last longer, but if you paint a normal steel system with some heat resistant paint it will also last a good length of time. Removing the catalyst will give a large increase in power, but in most countries this is illegal - and pretty bad for our (already mostly destroyed) environment. It is also possible to buy 4-2-1 manifolds which will help liberate some power.
The most effective modification (short of engine rebuilds!) is probably to replace the electronic control unit (or 'chip'). A variety of these are available, but all should increase the power and improve the driveability. The downside is that these usually cancel the warranty and may affect the durability of the engine, the emissions and the fuel consumption. A larger injector can also be fitted and will, together with the new module and a reprofiled camshaft, significantly improve the power output.
Other things to do should include fitting a cold air intake, a large diameter pipe (minimum 5cm) to provide air from outside the engine bay to the air filter. The exhaust manifold can also be lagged with thermal cloth or tape to keep the exhaust gases hotter (and thus reduce back pressure) and also to keep the underbonnet (and hence intake and fuel) temperatures lower.
The high tension leads can also be replaced with performance ones.
Further modifications can include gas flowing the cylinder head and inlet manifold, but since these are not normally DIY jobs they will not be dealt with here. After completing all the above (!) it may be worth fitting an oil cooler. If overheating is a problem due to the increased power output then a small hole can also be drilled through the plate in the thermostat.
Regarding the transmission the main requirement is to uprate the clutch to handle the increase in power and torque achieved though the engine modifications. Friction plates can be purchased with improved materials and heavier duty pressure plates are also available. Whilst doing this it is worthwhile lightening the flywheel.
Another option is to install a turbocharger. If the compression ratio is dropped to around 8.5:1 (from the standard 9.6:1) ten a boost of 0.7 bar can be used, which, combined with an intercooler, thicker head gasket, conical air filter, fifth injector and aftermarket injection module, can produce around 110bhp.
