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Message: [QUOTE="Charles, post: 57970, member: 103"] Pretty much. Since the stock chargers are only going to be able to be held at a given PR with any practical amount of wastegating, the resultant room between that PR and the target manifold pressure is all that's left for the first stage to make up. If that value is low, then the first stage must be bigger to move the same volume of air with equal efficiency than if it were able to spin up higher and run more pressure. For instance, on a 7.3 a GT47-88 first stage charger will make similar power to a 70 some odd mm single charger because the single is much higher in the map, where it can move to the right without exceeding the choke point of the wheel, whereas the 47 is just loafing along near the bottom of the map in comparison. Seeing as the maps lean to the right, you can move the same air at a higher pressure with a smaller charger as you can with a bigger charger running less pressure. However, once you start exceeding the pressure ratios where the single stage can maintain equivalent efficiency, the multistage setup starts to pull away. And even when they are equal in full power efficiency, the multistage system will have a much broader powerband and much better driveability. [/QUOTE]

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