I fully agree. It will not work on a normal injected petrol engine.
On a turbo diesel it might give improvment if it is tested and developed properly but you will for sure get better result by doing a proper mapping of the ECU. After all you are only manipulating the ECU to do some thing that it is not programed for.
The extra power you might get on a TDI is just a result due to that the fuel management sysyetem is programed to follow enviromantal regulations.
The improved power by adding a resistor on a TDI is most probable due to the fact that the ECU allowes more boost pressure from the turbo.
Jocke......
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MHR 900 1984
851 Strada 1991 (now growing to 996)
S4 984 2002
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