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Message: [QUOTE="psduser1, post: 97848, member: 735"] Tycorr is correct- by the time the exhaust gas hits the wheel on a standard 1.0 housed 38r, the scrolls are no longer divided. That's why there is one 18.8 mm wastegate, which is woefully inadequate! If you gate before that you'll have a pressure difference between the uppipes, but not at the wheel. I can't say for a 1.15 housing, cause I don't have one, but Id speculate that its similar. Please correct me if I'm wrong. That design would make a wastegate most effective when plumbed into a common space, per Charles, rpminc, etc. Less piping, more accessible, so on. Closer to OP train of thought, if your primary turbo starts the boost, and guys with bigger housings mention slightly increased lag in a compound setup, would a tighter housing, aka 1.0, or even .84 housing minimize that. After all, your looking at a bigger turbo (atomospheric) to handle the top end. Properly gated, of course. Btw, execellent thread. Keeping the brain cells moving!:thumbsup: [/QUOTE]

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