Quote:
Originally Posted by Supracg135
Phrase it how you want but the Alpina runs an engine from the BMW factory but with a tune different (here, more aggressive) than that of the factory. If the M4 were to be in the same category, and thus be equipped with a tune more aggressive than that from the BMW factory, this race would not be as close. Nevertheless, this video goes to show that the Alpina is damn fast.
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The B3 is not an engine from BMW factory with an aggressive tune. It has a different turbo setup and cooling system, much the same way the M4 engine also has a different turbo setup and cooling system compared to an N55, but in a different way.
The M4 engine produces less torque at lower rpms and more torque at higher rpms compared to the B3 bi-turbo engine. It would be fair to assume that the B3 engine runs higher boost than the M4 engine, but is less de-throttled. I wouldn't know if the turbos are actually the same though. They could also have been taken from the N54 engine I guess...