Quote:
Originally Posted by bquatt
So I need to clear the air - what's the difference? I have a B46D 330i as most if not all in the USA do, but why the prodding into the engine code? Is there really a difference between engines with different alpha characters? Besides the obvious numeric B46/B48 SULEV differences..
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Yes
If you are in the US and have a non hybrid 330 you have the B engine
The distinction between A and B are as follows
The A engine is used exclusively in 20i and 30e models, the B engine is used in both 20i,30i and 30e models. The engine differ in many of their components which affect how much you can push them with stock parts (the most obvious and major difference is the A engine utilizes higher compression pistons which limit the boost you can make)
When the B engine when utilized in the 20i application it's detuned in purely software compared to the 30i application