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Message: [QUOTE="Charles, post: 272835, member: 103"] With a drop in replacement turbo in the stock location and a 88mm charger ahead of it with the stock cam and heads my truck would be better than 1:1 up to ~60lbs of boost, and by ~70lbs I had ~80lbs of drive last I checked these sorts of things. Exceeding 1:1 is not hard. A good turbo setup will see boost higher than drive without doing anything extravagant. As for effecting your boost:drive ratio.... it isn't done by altering the wastegate on a given charger. It is done by altering the A/R and turbine size and trim for a given compressor. The cost is that fixed geometry units that exhibit excellent boost:drive ratios up top, will be hard pressed to show acceptable driveability down low, as the A/R will likely be loose, and the turbine large. Compounds make this problem very controllable however, in that you can run a large, relatively loose turbine section on the first stage compressor, yet have a relatively small turbine section on the second stage compressor to get the show moving that gets bypassed as drive picks up. [/QUOTE]

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