duramax diesel turbo on my ls1?
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I guess I worded that wrong. The VGT turbo essentially has a variable A/R ratio. Therefore depending on whether the vanes default to an open or closed position, the turbo would have a very large A/R or a very small one. Probably not the best for performance.
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I would look into a bullseye turbo. They are a good cheap turbo. They have one that could get you to 900rwhp. I think its a 80mm S480. As far as diesel turbos go, thats what it is, but they are cheap new. Made by borg warner. Holsets are good, and don't have weird flanges, not sure what you guys are thinking there. T3 T4 are pretty common flanges. HX55 is only good for like 650 flywheel hp I believe and no bigger than a 5.3, but probubly better for a 4.8.