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The fuel pump in the tank runs at 5 bar (72.5 psi) continuous. The high pressure fuel pumps run at a maximum of 200 bar (2,900 psi). They cannot produce a higher pressure without software modifications. As soon as my engine requests over 200 bar, it drops the fuel pressure to under 100 bar, and goes into limp mode. This cannot be solved with piggy bags, it requires a proper dme tune I mentioned above. This problem started when we removed the torque limiter from the gearbox. Once sorted I am sure it will be awesome and it opens up the doors to upgraded turbos.
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