pitjardas

Hi all,
my rs turbo CVH is converted to EFI, Ofab, with a 195 chip made for motorsport development maped to T3 turbo, beige injectors, intercooler. The car is suddenly making mixtures of air / fuel too lean.. mark the air/fuel gauge 10:1 when put foot on the accelerator. The fuel pressure is 3bar with 911 bosch fuel pump. The car heat up too much. If I speed up the background, still lean. the ECU does not accuse any sensors damaged. Help please
Sorry for my bad english

BRAM

iTrader: (1)

I would say that was to rich not lean 10.1
It should be close to 14 on cruise and maybe around 12s on boost

pitjardas

My pressure gauge is measuring a brand PROSPORT and I think when 10 is very lean.
http://prosportgauges.com/wideband-6...ber/White.aspx

Chip

iTrader: (3)

The ratio is 10 parts air to 1 part fuel.

Thats very rich.

20 parts air to 1 part fuel would be very lean.

BigPeBe

Yeah to me it seems that pitjardas you are reading the gauge wrong. Higher number means leaner and opposite. 14.7 is so called perfect ratio for economy IIRC and 12.7 is usually best for full power. With 10 you are probably even getting a little bit of black smoke when accelerating.

Chip

iTrader: (3)

14.7 is the stoich ratio, so is the "perfect" burn in theory, but in reality you tend to find slightly leaner than that is optimum for economy.

Peak power depending on the engine can be anywhere from about 12.5 - 13.2 IME, but on a turbo I would never be that lean flat out, 11s and even 10s are where its at IMHO