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  #1  
Old 20th September 2010
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juggyvampire juggyvampire is offline
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Default boost pressure fault lights

what sort of boost pressure should i be looking for without going silly on a stage 3 aero auto ecu ,i have turned the actuator up to approx 10/11 psi on standard actuator but this has caused intake air sensor fault to light up and air fuel mixture light on check engine light 3 and 7 ,now im puzzled any help guys?
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  #2  
Old 21st September 2010
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any help welcome
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Old 21st September 2010
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surely ecu controls boost pressure telling turbo to spool more pressure from boost control valve so turning up actuator would cause over fuelling am i correct
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Old 21st September 2010
Superaero Superaero is offline
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Fuelling is controlled by an absolute barometric pressure sensor. This calculates the actual oxygen content from an assumed number correlated to the mass of air in the intake plenum deduced from the absolute pressure thereof. Excess fuelling could not happen. More boost means more fuel only if actual pressure increases.

SAAB trionic uses a feedback loop using knock sensor function from the spark plugs which signals the ECU to bleed boost pressure from the wastegate actuator line. This allows the boost to increase until knock is detected.

Assuming aftermarket ECU's piggyback on the trionic software 9I do not know if they do or not) then these must exploit tolerances in the factory programming. Usually one must trade low end boost off for high end boost which is not great for street use.
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Old 22nd September 2010
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gapped the spark plugs to .9mm turned pressure back down but think intake air sensor is shot ,got a new one on order from main dealers is there any where else that do them apart from main dealer rip off in the u.k.
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