| an NA car that has had turbos added to it (I think it was Z1 who is doing it). Anything can be done if you have enough money and time to throw at it. As for 2 vs. 1 on turbocharging, part of this is marketing (if one is good, then 2 have to be better), and the other of this technical advantage. In some cases, the two turbos are not the same size; one will be smaller than the other which reduces turbo lag (the smaller one comes on boost earlier than the larger one). If I recall correctly, this is known as sequential turbocharging. The other reason to go with 2 turbos rather than 1 is that two smaller turbos can be packaged better in the engine comparment, and can provide more power. To achieve the same power output in a single turbo set-up, the turbo would have to be much larger which creates problems with locating it in the engine compartment as well as increasing the turbo lag. This is a much simplified reply and I'm sure other folks will jump in with more detailed explanaitions. Dave N.
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