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Message: [QUOTE="Power Hungry, post: 506265, member: 1375"] The stock OBS turbo and the 38r are two completely different turbos. A 1.0 A/R housing is going to respond entirely differently on the OBD turbo than it will on the 38r. A 1.0 housing on the OBS turbo will certainly gain you some boost and will provide considerably improved spooling characteristics, but the exhaust backpressures will be quite astronomical with anything larger than Stage 1 injectors, and even then they would be quite high. One other thing to keep in mind is that the 1.0 housing on the 38r is WASTEGATED, so we can control drive pressure with a relatively simple adjustment. If you're using a non-W/G 1.0 housing, you kind of asking for trouble as you have zero control over your drive pressures. As to the original testing, like Jason said, we made direct swap comparisons for the initial testing and then tried to adjust the files to see if we could tune-out the deficiencies. The results were that the 1.15 housing lost power and so did the BMW. The best combination so far was the 38r setup right out of the box. I hope this makes sense. [/QUOTE]

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