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There is no exact conversion formula from engine to wheel power. As a rule of thump, the loss is guesstimated to be between 10-15% (some say 20%). No matter what it is, I still think that the R32 should produce more than the 283 hp it is now producing at the wheel at 1 bar boost. If the hose is broken (you might be able to see it or you might hear whistling when you boost comes on), than you are losing pressure and that could cause abnormal lag.
If you increase boost from stock to 1 bar and the hp does not increase significantly (which actually they should), than it might be due to the fact that you have not remapped the ECU to provide more fuel in view of more air volume after the boost increase. Increasing the boost without increasing the fuel delivery will result in a lean fuel/air mixture - you can notice this when the engine is strugling at high rpm (coarser than normal engine sound). That could be the reason for your low hp even when the boost is 1 bar.
Bumping up the fuel pressure is not the answer to a lean mixture. You have to do it at the ECU. I would suggest that you check the air/fuel mixture. I suspect it is lean.
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