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Message: [QUOTE="Big Bore, post: 94472, member: 760"] My atmo is going to be significantly smaller than the gt55. I don't talk about it much because most people will naysay the charger I'm going to use, but it has a 102mm exducer/74.3 inducer compressor wheel and a 84mm turbine with 1.44 A/R. Most of the reason I get flak is because very few people, even those who know turbos, know what towing at 9,000ft to 11,000ft is like. My compounds are being sized for performance but still be ableuse my truck to tow heavy without the high altitude penalties of a larger turbo i.e. lag, smoke and heat. Using the above specs would a 38mm WG on the 38R with 1.15 A/R exh housing still be too small? Is there a formula to help calculate the WG size needed? Good picture. I was aware of what the terms meant in regards to direction of flow etc, my confusion was when numbers were being thrown around which one were they. Thanks for clearing that up. [/QUOTE]

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