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Beitrag: [QUOTE="exmantaa, post: 572811, member: 8577"] ziehe ich ab 5000 U/min (1,2 bar) den Ladedruck auf 1,05 bar bei (6000 U/min)runter......... This has also the advantage that you open the wastegate more and lowering the pressure in the turbo-manifold. Less pressure = less backflow in cilider! The pressure-diagrams in the RALLY article are till 4500rpm with an unregulated turbo..... (wastegate closed, >1,5 bar boost...) So maybe till 1,2 bar (regulated) we are still safe with the backflow?? Even better is off course when you can keep the same 1,2 bar boostpressure AND lower the manifold pressure for flow => READ: use different compressorwheel! (Arno's K26 conversion) More efficient compressor can run same K16 boost, but with the wastegate more open => less pressure = more flow = Good! (Arno wrote this also somewhere) So what I need to do: Different inlet cam.... (and maybe time exhaust little earlier) Free flowing exhaust..... Upgrade to Phase 3.5+, or use Apexi or..... A K26 conversion.... Some self-control to keep boost at 1,25 bar..... Oh, and a new car to put my LET in......... Frank [/QUOTE]

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