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Monthly Archives: June 2013

Callas – 24 Hour LeMans 1998 Technical Assistance

Have you ever wondered what it’s like to be behind the scenes at LeMans, behind closed garage doors? See what goes into the preparation, running and accident correction of a Porsche GT2 for the 24 hour world famous endurance race known as LeMans

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Racing

Porsche 986-996-987-997 Fuel Trim Information

Hey Tony, Can you shed some light on a fuel trim fault on my 996. It is reoccurring and I am having a tough time finding the problem. Anytime you have a ME 5.2.2 (1997-1999 986-996), ME 7.2 (E-Gas 986-996) or 7.8 (Roughly 2002-on) 986 and 996 with running issues, check the fuel trim numbers: TRA-RKAT (Idle range which is around 1700 and below) FRA-FRAU-FRAO (cruise range which is around 1700 and above) fuel trim numbers. The Oxygen sensing AKA Lambda or on the later models they call it “fuel trim mean value” is “STFT” short term fuel trim. The TRA or RKAT and FRA or FRAU-FRAO are the “LTFT” long term fuel trim. For TRA and RKAT you want around them “0”. If it is below “0”, the car is running rich at idle and it is taking away fuel in the Idle range. If it is above “0” the car is running lean and it is adding fuel at the idle range. The FRA or FRAU-FRAO should be around “1”. If it is below, the car is running rich in the cruise ... read more

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