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I wonder when car(Saab) want to modify hp and torque, just install programe in ECU but don't have to change engine block?? For example, in my country, dealer adjust 9-3ss 175 to 195 hp, and this block still have 150 hp to more than 200 hp in Aero. Will it make more erosion in engine? and in long term using, How the engines durability and maintenance? and Doing this will decline the safty factor?
 

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In these cars, all of the engine blocks are the same. It is the GM corporate "ecotech" engine, used in everything from Opels to Chevrolets. In the Saabs, there are two different sized turbochargers. The rest of the differences are purely from ECU tuning.
The 150 HP and 210 HP engines are identical except the size of the turbo. One it tuned to give slightly more boost and a longer pulse duration for the fuel injectors, hence more power. The difference between the 150 and 175 hp is purely in ECU programming. For the 150 hp engine, you can modify the ignition and fuel injection maps in the ECU to get more power, up to about 205 with the PPC programer.
To get this power, you have to give something up. In this case, its the ability to use lower grade fuels. The ECU is modified for higher boost pressures and more ignition advance, so a higher octane fuel is needed to prevent knocking.
These days, 100 HP/liter is not really extreme tuning, especially with forced induction. Some cars can even exceed that normally aspirated (Honda S2000: 240 HP/2litres; Subaru WRX:300 HP/2.5litres turbo; Mitsubishi Lancer EVO: 273 HP/2liters turbo) and are not giving up reliability or durability.
 

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jpk said:
In these cars, all of the engine blocks are the same. It is the GM corporate "ecotech" engine, used in everything from Opels to Chevrolets. In the Saabs, there are two different sized turbochargers. The rest of the differences are purely from ECU tuning.
The 150 HP and 210 HP engines are identical except the size of the turbo. One it tuned to give slightly more boost and a longer pulse duration for the fuel injectors, hence more power.
Not true.

http://www.saabcentral.com/forums/showthread.php?t=17892
 
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