If you are considering forced induction for your bimmer, or any BMW for that matter, there are various things to take into account. There are the basic issues like, turbo versus supercharger, which manufacturer and how much boost pressure. But similarly important are considerations of how other components within your auto will need to be changed to adequately handle all of that increased horsepower. It is hardly ever the situation where you can simply install a supercharger and you are all set without being required to consider these other systems.



I cannot describe each BMW model in terms of forced induction, there are just too many versions to cover here. Nevertheless, in general, superchargers offer a slightly less expensive, easier to install solution. Superchargers frequently make 6-8 lbs of boost and the average home mechanic can safely install a kit in a day. Superchargers will often make significant hp but many tuners do not make a impressive amount of low end torque. For daily driving you will not see much of an improvement until you get to higher RPMs. Turbos offer impressive HP potential, produce a lot of low end torque once spooled up but can result in a technical installation. For example, in high boost applications you may need to reduce the compression ratio with either a spacer head gasket or shorter pistons. There are more items to a turbo kit as well, consisting of items like an intercooler, bypass valve, blow off valve, waste gate, exhaust manifold, larger injectors, etc. The typical home mechanic will often not be able to complete this installation. A trained technician will need 8-12 hours depending on which kit and this can boost the total cost of the kit. However, the increased performance is worth it as long as it is in your budget.

Brakes: Well, if you have a 400 or 500 hp bimmer you had better have 400 or 500 hp brakes. Increased power results in more acceleration, more speed and much greater stress on your braking system. Typical upgrades here include bigger diameter discs, multi piston brake calipers, sport brake pads, stainless steel brake lines and performance brake fluid. This should be one of the first things you upgrade after adding a turbo or supercharger.

Drivetrain: If you have a manual transmission, you should seriously consider upgrading the clutch. The Sachs heavy duty clutch is great for mild applications with more serious power needing a UUC, Clutchmaster or similar kit. You might as well change it out now, because your standard clutch will most likely be worn out very quickly otherwise. This is about a 6 hour project for most mechanics.

Cooling : Power equals heat. Your vehicle's radiator was designed to handle your stock power heat output. If you live in a hot area, track your car or do a lot of high speed driving you may need better cooling. A great bet here is to purchase a larger capacity, performance radiator. Make sure the system is flushed and has new fluid. You can also consider engine heat shields to keep the heat away from your intake and special hoods that have slats installed to allow the heat to get out easily.

Your Skills: The most important thing to upgrade is your driving abilities. All that hp can get you in a lot of trouble and you do not want to be injured or injure anybody else. A perfect place to begin is to look into BMWCCA driving schools. These are modestly priced and you really learn a great deal. There are also many other professionally run driving schools around the country that have the ability to teach you excellent driving skills.