Join Date: Oct 2002
Location: Home of the Nimbus
Turbo behaviour from a TS !!!
Just got the car back from a cam variator replacement. This finally let me explore the engine characteristics. And what a surprise, the engine now has definite turbo characteristics. If you perform a "pedal-to-the-metal", from say 1500rpm, the engine will pick up revs quite strongly and with strong torque untill you reach about 3500rpm, then the torque curve seems to flatten up till 4800rpm. At the exact moment the engine hits 4801rpm, the turbo effect kicks in.
Without being able to measure this I would say that torque increases by about 25%, the car practically jumps forward picking up revs at a constantly rising rate, all the way up to the red line.
Apart from this being quite fun when overtaking and the engine suddenly hits "turbo-rpm" expediting the manouvre at double speed, this really surprises me. Do all TS engines behave like this? This could be really addictive and also lead to a hard life for the engine!
I would have thought with cam variator and all the factory would have aimed for a broad powerband. Is it possible that the garage (non-Alfa) has screwed something up, when installing the cam variator? Turned it upside down or 180degr. round or something?
Otherwise I am definitely going to explore ECU re-programming or tuning, because there must be loads of torque lurking inside that litte gem of an engine!
Alfa driver by choice