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Yearly Archives: 2012

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

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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

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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

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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

914-4 conversion to 914-6 GT Project

914-4 conversion to 914-6 GT Project

914-6 GT Complete Build-001 914-6 GT Complete Build 914-6 GT Build 914-6 GT Build Flares being installed 914-6 GT Clone Build 914-6 GT Build flares being installed 914-6 GT Build 914-6 GT Build 914-6 GT Build 914-6 GT Build 914-6 GT Build 914-6 GT Build CR 914-6 GT 914-6 GT Build 914-6 GT Build 914-6 GT Build

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Uncategorized

Callas Rennsport Change!

For the first time in 20 years, in an effort to handle our clients more expediently and just improve our overall quality, we added/moved one of our most valued technicians, Casey Gervig, into a “Service Adviser” position. We have purchased all new computers (network) and actually are converting from a DOS to Windows based operating system (most of you will laugh). We are also updating our automotive service system to the new Scott Systems Maxx Traxx software. Needless to say, we are now looking to hire a new automotive technician to fill this void. Callas Rennsport is immediately growing and accepting resume’s for this new position. With Tom Prine and Kelly Callas in our main office, Tony Callas and Casey Gervig in our shop office, 4 master technicians, 1 apprentice technician and 1 helper out in the shop. 10 individuals that still offer personal, detail-oriented service in this fast-paced world. Thank you for your support, and we lo ... read more

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News and Updates

Living with the M96 Engine and the IMS

Today we know that the IMS (Intermediate Shaft Bearing) has been a major cause of concern for owners of 986/987 Boxster and 996/997 Carreras. It is generally accepted that far fewer problems are being experienced with the M97 engine, but that said, there have been IMS bearing failures in M97 engines also. Unfortunately, the IMS bearing in the later M97 engines cannot be easily replaced like in the M96; the later M97 requires complete disassembly of the engine for IMS replacement. One of the main concerns relative to these later M97 engines is how the factory’s larger IMS bearing will hold up over the long term when the miles driven get well beyond that of the 100,000 mile mark. The potential for serious engine issues is not something new for those of us that have owned 911’s over the years. For those who have, it is likely you are aware that there have been multiple problem areas with these engines. Oil leaks for all years. The cylinder head studs in the 1975-1989 911’s. The ... read more

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Uncategorized

Porsche Clutch Systems 101

Manual gearboxes have always been synonymous with Porsche. Although the Sportomatic, Tiptronic and currently the PDK automatic transmissions are great and have a loyal following, there is just something really cool about working the clutch and shifting through the gears in a Porsche. Every car with a manual gearbox includes a clutch at no additional cost, well at least initially. We are often asked how one knows when a clutch is worn out or going bad. Generally, this can be dependant on a number of factors and in some cases when the vehicle was manufactured. For example, all Porsche’s that have a clutch cable, if there is no more adjustment length on the cable available, and the clutch is slipping; it is time for a clutch replacement. Porsche has not utilized a clutch cable since model year (MY) 1986, so that method of diagnosis is only applicable to that year and earlier models. Starting in MY 1987, Porsche utilized a hydraulically actuated clutch ... read more

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Transmission

Finding the Right Independent Repair Shop for You and Your Automobile

At some point in time, every Automobile will require service and or repairs. If you are a trained Technician or a qualified mechanic with the tools and available time then, problem solved. For everyone else, it is necessary to find a service facility that will meet the needs of your Automobile and insure your own piece of mind that the work performed is done competently and correctly. Finding the right Shop can be a difficult proposition but here are a few things that can make this tedious process a little easier. We suggest that some of the following questions may perhaps help: How long has the shop been in business, particularly under the same ownership? In detail, how long is the shop’s warranty on the work performed and what does it cover? How are the shops ratings on the various forums and search results (Yelp, Yahoo, Rennlist, etc)? For the work being performed will the shop utilize factory ge ... read more

Categories:

Maintenance
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