Hello, as noted in the title, I am facing two issues. My car has been tuned on two different maps (stage 3) by two different tuning specialists. The same problem persists across every tune. At high RPMs, the pressure in the LPFP (low-pressure fuel pump) significantly drops. I have installed both a new LPFP and a new module (both by Pierburg), yet the issue remains unchanged. I then replaced the module with an older OEM one, which initially performed bette but at high RPM is it worse. On the dyno, the car outputs 340 horsepower. My second issue is that the exhaust is very black, occasionally emitting black smoke along with a strong gasoline odor. The exhaust tip is also blackened and shows signs of burning. I’ve installed a new MAF (Mass Air Flow) sensor and a new lambda sensor, but the problems persist. Below are the specifications. The engine has been upgraded with forged internals.
- Forged pistons and connecting rods kit ([BAR-TEK Ultimate 2.0 L TFSI EA113](
https://www.bar-tek.com/forged-piston-conrod-set-ultimate-2-0-l-tfsi-ea113))
- Intake camshaft (Golf 6R)
- S3 injectors
- BorgWarner K04 turbocharger
- 3" complete exhaust system without a catalytic converter
- NGK BKR8EIX spark plugs
- NGK R8 ignition coils
- REVO intercooler
- K&N air intake system
- Oil catch can
- Pierburg low-pressure fuel pump and module (stock)
- Hitachi Dynaparts upgraded high-pressure fuel pump (HPFP)
- Audi RS4 fuel return valve - 079 130 757
- VAG 200 Bar fuel pressure sensor - 06J906054B
- Turbosmart BOV Kompact EM BOV R1 blow-off valve
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