The Alfa Romeo Owners Club here in Melbourne had its Dyno day today. This is where members bring their Alfas for a run on the dyno to get horsepower readings (at the wheels), torque and air fuel mixtures. The day was held at Beninca Motors, a very long established and respected Alfa Romeo specialist and automotive engineers.
Interesting results from our 159 3.2. (By the way, this engine is completely unmodified, 4,800kms, using 98 octane fuel).
Maximum horsepower at the wheels was 168BHP. Max torque was 235Nm. Air fuel mixture (as measured at the exhaust) was steady from 2000 to 4800 and then dropped. This indicates more fuel was being used at the higher revs.
The horsepower result is disappointing.
This means alot of power is being lost throught the AWD transmission. As a comparison of other cars today: a 156GTA (rated @ 184KW) pulled 195BHP at the wheels, a GTV V6 24V (rated @ 162KW) pulled 161BHP at the wheels.
As a general rule of thumb, a manufacturer's engine kw readings is approximately the horsepower reading at the wheels.
I was told that a possible reason why the increased fuel mixture above 4800 is to keep the engine cooler at the higher revs. This might also indicate why we are getting terrible fuel economy from this engine.
Also: I was told that there is a software upgrade available from authorised Alfa Romeo dealers to assist with the fuel economy.
Anyone else had their car on a dyno yet?