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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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970

The Crew Chiefs Notes: The Daytona 24 hours

The Crew Chiefs Notes: The Daytona 24 hours By Tony Callas and Tom Prine The history of sports car racing at Daytona International Speedway started in 1962 with the Daytona Continental, a 3 hour sprint race and was first won by Dan Gurney in a Lotus 19. This race expanded to a 2,000 Kilometer event in 1964 and then two years later in 1966, Daytona hosted the second 24 hour race in the USA; there will be a little trivia at the end of the article. The 24 Hours of Daytona is the first race of the season. Preparation for the race must start months before the event, even if you’ve purchased a brand new racecar from Porsche Motorsport in Weissach, Germany. Hotel rooms must be booked 3 to 5 months in advance, it is always better to have all crew members of the team staying at the same place, both to keep track of everyone and the ease of shuttling members to and from the hotel and track. The number of crew members is dependent mainly on the ... read more

Categories:

Racing

Corner Balancing: The Last Step in your Suspension Upgrade

Corner Balancing: The Last Step in your Suspension Upgrade You fell in love with driving your Porsche when you purchased it, but over the years and miles the handling began to lose its crisp response as the wear and tear took its toll. Wanting to get that great handling and even more back, you made the decision and upgraded the suspension to competition or sport type coil-over struts/shocks that have adjustable spring height perches like those of the Bilstein PSS9 and PSS10 systems. To make your Porsche’s high performance/competition suspension truly effective in its braking and cornering, there is also another very important step in the process of optimizing your car’s handling; the distribution of the car’s weight on its four tires. This is because the tire that is supporting less weight, when compared to the other three, is likely to be the first tire to lose traction when encountering the constantly changing dynamic forces created through movement and speed ... read more

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Suspension

Servicing the Cayenne Automatic Transmission

Servicing the Cayenne Automatic Transmission We were contacted recently by a PCA club member who asked if it would be possible for him to perform a service on the automatic transmission in his Cayenne. The answer is a qualified yes, it is possible; however, having the required tools and the procedural knowledge for performing this service is critical. After documenting this information, we thought that it might provide an interesting insight for club members as to what is involved in performing this important service for the Cayenne. This is also somewhat indicative of servicing the later model Tiptronic transmission equipped Porsche’s. We recommend you warm up the engine to operating temperature. Drive the vehicle and make sure that the transmission operates properly; shifting correctly in all gears and speeds. Let the car cool down overnight before starting the transmission service. Be prepared to dispose of the fluid and filter properly due to t ... read more

What does it take to wear out a Porsche?

What does it take to wear out a Porsche?

A 24 hour race. The 24 Hours of Le Mans or the U.S. equivalent, the 24 hours of Daytona, are both incredible endurance races where just finishing is a cause for celebration. An intense race like the Daytona 500 takes roughly 3-1/2 hours to complete, however this is a “Walk in the Park” when compared to running a car flat out for 24 hours. Consider that operating a street car under these same conditions would be the equivalent of a lifetime of wear and tear, every mechanical system in the car would be completely used up. Like the wear and tear on the racecar, the people involved are also pushed to the limits. The rules allow for a minimum of 3 drivers per car, some teams will have 4 to 5 drivers per car to complete the 24 hour race. The drivers all take turns at the wheel rotating in one hour driving stints and even double stinting on rare occasion for the driver’s that are in incredible physical condition. When they are not in the car, they are trying to slee ... read more

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Racing

Porsche Engine Rev Limiter Systems

Porsche Engine Rev Limiting Systems Engine Rev Limiter systems started in the early Porsche 911’s as a mechanical sliding ignition rotor whose sole job was to cut power in the event of an engine RPM over-rev. A section of the ignition rotor would slide outwards driven by centrifugal force depending on the engines RPM speed and would eventually make contact with a ground terminal, shutting the engine off until the engine reached a safe RPM range. The simplicity of the past is now gone and replaced with an extremely accurate electronic control system. The rev limiter for the 9X6’s and 9X7’s utilize a fuel/ignition cut off system operated by the DME (Digital Motor Electronics) controller that engages when the engines RPM reaches a model specific maximum limit. In addition to the current rev-limiter controls, today the DME keeps a record of all engine over-revs. The over-rev capture capability should be checked during a PPI (Pre-Purchase Inspection) be ... read more

Categories:

Maintenance

Beauty is in the Details

Historically, Porsche’s paint quality has always been world class. However, over time, your car’s paint is exposed to combinations of dust, dirt, tree sap, bird dropping, water, chemicals plus everything else in the air which can take a toll on the quality of the finish. Of course, the painted surface of any car must be cared for to maintain its outstanding finish. Unfortunately, not all Porsche owners keep up with the maintenance of the exterior finish. Reasons differ, but the most common is just not having the time to do it yourself. Today, there are many fixed location and mobile professional detailing services that cater to conscientious car owners that want to preserve their cars fine finish. When choosing a detail service business, it is best to get recommendations from someone you trust, your friends, your mechanic, a high quality paint shop or the local PCA (Porsche Club of America) chapter. It is also important to use companies that utilize methods and p ... read more

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Maintenance

Handling Issues

Porsche has always built cars with incredible performance, handling and braking. From the early days of the 356 to the modern Turbo S and everything in between, all provide balance and handling that makes every automobile manufacturer envious. Drive your Porsche into a corner fast and a completely different personality emerges – a magical personality that the engineers at Weissach make sure is within every Porsche, whether destined for your garage or a checkered flag at Le Mans. Of course, over time, and a lot of corners, suspension components wear and can even break. If you happen to notice an abrupt change in your Porsche’s handling characteristics, be sure to have the problem diagnosed immediately. Whenever a handling issue is experienced, the first thing to check is the tire air pressures. If a tire is deflating, it can cause the car’s handling to become very unresponsive, unstable and potentially create a dangerous situation. A tire with very low air pressur ... read more

Categories:

Suspension

Welding on the chassis of a computerized Porsche

Sometimes it becomes necessary to weld on the body or chassis of your Porsche. This would usually be part of a repair following an accident but could also be non accident related repairs or modifications that would require welding to be performed somewhere on the car. We are specifically concerned about using the different types of electric arc welding. These include Stick, MIG (Metal Inert Gas) and TIG (Tungsten Inert Gas) welding also known as Heliarc welding. All of these electric arc welding types use electrical energy (either A/C or D/C Voltage) to generate extreme heat at the localized spot where the weld is taking place. As part of the welding process, an earth connection (welder ground) is made near the welding site to isolate and collect this energy during the welding process; however, not all of the electrical energy will necessarily take this path. High frequency electrical energy can be introduced into the car’s grounding and wiring systems through th ... read more

Categories:

Chassis

Excessive Fuel Consumption and Poor Overall Performance

Excessive Fuel Consumption and Poor Overall Performance

Recently we had a 996 Coupe in the shop, the customer’s concern was that the fuel consumption appeared excessive and the engine seemed to be less responsive than normal. We ran a complete controller interrogation, meaning we scanned all the control modules (computers) in the car for faults with the PIWIS (Porsche Integrated Workshop Information System) scan tool. Primarily we were searching for faults or fault codes in the DME (Digital Motor Electronics) controller AKA the ECU (Electronic Control Unit), there were no faults present. At this point most technicians would conclude that since there are no faults present, there must not be a problem, however, this is not always the case. Through experience we know and believe that the customer is usually very familiar with the operating characteristics of their car. With this in mind we continued our diagnosis. We performed a test on the pre-catalyst (before the catalytic converters) oxygen sensors utilizing a DSO ( ... read more

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