geza

Eaton units are a positive displacement - roots type blower - with the downside of heating the incoming air charge that is forced into the engine. This type also tends to rob horsepower at high revs because they are a high parasitic load on the engine as their blower speed increases. The other unit is a centrifugal supercharger - with slightly less propensity to heat the ingoing air to the same degree. You would have to have air temp measurements on both installations to know the actual differences. Centrifugal units have a lower parasitic load. Regardless, heated air beyond what normally enters a naturally aspirated engine creates all sorts of top end problems - increased piston ring wear, higher cylinder head temperatures, more cooling stress on the engine - and this leads to bottom end issues, as well as connecting rod stresses that are beyond the original design criteria. RUF also have a kit - and they recommend a complete engine overhaul before supercharging if you have in excess of 50K miles - interestingly they use the centrifugal type unit - and RUF would have good reasons to do so. In general, you may want to save your money - as the 996 flat bottom engine was never designed for supercharging - and put the cash towards a good used Turbo. Additionally, any resale value in your Supered 996 will be severely limited to those who want your exact car. Good luck!

Elemental analysis of engine oil is subjective IF you cannot get the OEM specs for life/concentrations of key elements that make up the engine's moving parts. Silicon, Iron, Chromium, Molybdenum, Aluminum, Magnesium, Boron etc. are very difficult to quantify in an oil analysis if one does not know the empirical make up of the engine wear parts. Molybdenum from the rings, silicon from the cylinder bores or dirt, chromium from rings and camshafts, iron from pistons, cam chains & drive sprockets.......one needs to know the composition of all the moving/wear surfaces. So, you can send any sample for analysis - but are the results going to have any real meaning?.....that is the most difficult question to answer without serious OEM involvement. I doubt this kind of information from Porsche is easy to get. You may have better luck talking with a dealer who does oil analysis - do they know of any OEM specs as a reference/guide?

http://www.autoplates.com/catalog/license-...4b8318e61db763b

GT3 engine totally different from Carrera engine........may not be the same flywheel. Non OE flywheels (aluminum) transfer a lot of transaxle noise into the car.........may or may not be street appropriate.

74mm 14 flute - $3.99 at Pep Boys (3/8" drive)

Most Auto part shops have colored car wax/polish - used to hide scratches on exterior paintwork. Match the closest version to your seat back - and see how it fares. A plastic polish won't work - since the scratch has removed the paint, and exposed the plastic composite color below - you have to somehow replace the lost color, and the suggested automotive colored wax is probably the easiest solution - other than using a touch up pencil or brush..........

It seems that everything Porsche does for any aspect of the shape of the car is for aerodynamic reasons. The chin spoiler keeps air out from under the car - at high speed. Probably required on the autobahn, but maybe not on our interstates..........

It could be normal clutch plate wear, or since it seems directly related to engine speed, an issue with the dual mass flywheel. The fact the clutch seems to still bight and perform under load suggests the pressure plate is OK - and that feel when stationary is acceptable etc. There could also be some issue with the thrust bearing when it reaches maximum distance - some possible slight interference resulting in the feedback of vibration. The only way to check the flywheel operation is by removing the transmission and manually determining the movement of the sprung flywheel mass to see if it is within spec...........not sure if your dealer will do that to determine if that in fact is the cause of the vibration. Maybe it is symptomatic of the car - test drive another one on the dealer lot that would be most similar to your car to see if the same feeling applies.......but if your car is unique, the diagnostic skills of your dealer technicians will be key - and your stance would be to try to solve it before it has the potential to develop into other issues.

The owner's manual we have for our MY04 996 suggests the low temp cut off for synthetic 15W50 is 50F. The ASTM pour point for Mobil1 15W50 is minus 42C. The ASTM pour point for Mobil1 0W40 is minus 54C. You can find the spec sheets for all Mobil1 oils at www.mobil1.com

www.zeintec.com if you have yet to see this..............

The two small hinges at the forward/top of the spoiler could be treated with a dry molybdenum or graphite powder. Another option is to get hold of some synthetic marine grease/lube that is waterproof to keep dust and grit out of the hinge. As for the actuators - the struts that emerge from the two winding mechanisms are plastic, and slide into the actuating cases. It appears there is a plastic bush that supports the strut as it slides up and down. I am not sure that any lube is required here, but if you do apply a dry compound, make sure it is plastic friendly. It appears that you can disassemble these actuators, as they have a split case - since these cases have a drain hole on their underside, you could use marine grease that is plastic friendly. The motor and cable screws that go to each actuator should be sealed in terms of lubrication. You'd have to remove the metal cover plate on the underside of the spoiler to see/listen to which part of the mechanism is making the noise. You might want to check to see if anything is caught in the decorational plastic bellows that could be part of the noise issue.

Sounds like the compressor is the problem...........maybe time for a new one.

Maybe these have something to do with it: Make : PORSCHE Model : CAYENNE TURBO Year : 2004 Manufacturer : PORSCHE CARS NORTH AMERICA, INC. NHTSA CAMPAIGN ID Number : 04V072000 Recall Date : FEB 16, 2004 Component: SEATS Potential Number Of Units Affected : 4144 Summary: ON CERTAIN SPORT UTILITY VEHICLES, THE DRIVERS SIDE SEAT FRAMES WERE NOT ADEQUATELY WELDED. Consequence: IN THE EVENT OF A CRASH, THE SEAT FRAME COULD BREAK, INCREASING THE RISK OF A CRASH. Remedy: DEALERS WILL REPLACE THE DRIVERS SIDE SEAT FRAME. OWNER NOTIFICATION BEGAN ON MARCH 29, 2004. OWNERS SHOULD CONTACT PORSCHE AT 1-800-545-8039. Notes: PORSCHE RECALL NO. A306.CUSTOMERS CAN ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATIONS AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236). Make : PORSCHE Model : CAYENNE TURBO Year : 2004 Manufacturer : PORSCHE CARS NORTH AMERICA, INC. NHTSA CAMPAIGN ID Number : 04V231000 Recall Date : MAY 17, 2004 Component: SEAT BELTS:REAR Potential Number Of Units Affected : 19175 Summary: ON CERTAIN PASSENGER VEHICLES, THE REAR SEAT BELT LATCH ATTACHMENT BOLT IS INSUFFICIENT RIVETED. Consequence: IN THE EVENT OF A CRASH, THE SEAT OCCUPANT MAY NOT BE PROPERLY RESTRAINED INCREASING THE RISK OF PERSONAL INJURY. Remedy: DEALERS WILL INSPECT THE BELT BUCKLE LATCH AND, IF NECESSARY, REPLACE THE LATCH. OWNER NOTIFICATION BEGAN ON JUNE 1, 2004. OWNERS SHOULD CONTACT PORSCHE AT 1-800-545-8039. Notes: CUSTOMERS CAN ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATIONS AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236). Make : PORSCHE Model : CAYENNE TURBO Year : 2004 Manufacturer : PORSCHE CARS NORTH AMERICA, INC. NHTSA CAMPAIGN ID Number : 04V593000 Recall Date : DEC 09, 2004 Component: SEAT BELTS Potential Number Of Units Affected : 31000 Summary: CERTAIN PASSENGER CARS FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 208, "OCCUPANT CRASH PROTECTION." ALL THREE REAR SEAT POSITIONS AND THE FRONT PASSENGER POSITION ARE EQUIPPED WITH SEAT BELT RETRACTORS THAT HAVE A LOCKING FEATURE WHICH CONVERTS THE RETRACTOR FROM AN EMERGENCY LOCKING RETRACTOR (ELR) MODE TO AN AUTOMATIC LOCKING RETRACTOR (ALR) MODE FOR THE PURPOSES OF CHILD RESTRAINT INSTALLATION. THE BELT MAY DEACTIVATE THE ALR MODE WITH CERTAIN CHILD RESTRAINTS. Consequence: WHEN INVOLVED IN A CRASH, THE CHILD RESTRAINTS MAY NOT BE PROPERLY SECURED INCREASING THE RISK OF INJURY OR DEATH TO THE SEAT OCCUPANT. Remedy: DEALERS WILL PERMANENTLY INSTALL A CLIP IN EITHER OF THE AFFECTED REAR OUTBOARD SEAT BELTS AND PROVIDE AN OWNER'S MANUAL INSERT. THE CLIPS WILL PREVENT UNWARRANTED CONVERSION FROM ALR TO ELR MODE WITH CHILD SEAT INSTALLATION. THE RECALL BEGAN MAY 17, 2005. OWNERS SHOULD CONTACT PORSCHE AT 1-800-545-8039. Notes: PORSCHE RECALL NO. A506. CUSTOMERS CAN ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATIONS AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236). Make : PORSCHE Model : CAYENNE TURBO Year : 2004 Manufacturer : PORSCHE CARS NORTH AMERICA, INC. NHTSA CAMPAIGN ID Number : 03V351000 Recall Date : SEP 24, 2003 Component: EQUIPMENT:OTHER:LABELS Potential Number Of Units Affected : 326 Summary: ON CERTAIN SPORT UTILITY VEHICLES, THE AFFECTED VEHICLES MAY BE MISSING THE GROSS VEHICLE WEIGHT RATING (GVWR) AND GROSS AXLE WEIGHT RATINGS (GAWR) ON THE CERTIFICATION LABEL AS REQUIRED BY PART 567.4(G)(3) AND (G)(4). Consequence: THE VEHICLE OPERATOR WILL NOT BE INFORMED OF THE VEHICLES GVWR AND GAWR. Remedy: DEALERS WILL APPLY THE CORRECTED LABEL. OWNER NOTIFICATION BEGAN ON DECEMBER 22, 2003. OWNERS SHOULD CONTACT PORSCHE AT 1-800-545-8039. Notes: PORSCHE RECALL NO. A401. CUSTOMERS CAN ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATIONS AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236). Make : PORSCHE Model : CAYENNE TURBO Year : 2004 Manufacturer : PORSCHE CARS NORTH AMERICA, INC. NHTSA CAMPAIGN ID Number : 04V069000 Recall Date : FEB 16, 2004 Component: ELECTRICAL SYSTEM:WIRING:FRONT UNDERHOOD Potential Number Of Units Affected : 10637 Summary: ON CERTAIN SPORT UTILITY VEHICLES, THE MAIN WIRING HARNESS WAS INCORRECTLY ROUTED. DAMAGE TO THE MAIN WIRING HARNESS CAN LEAD TO THE FAILURE OF VARIOUS ELECTRICAL SYSTEMS. Consequence: IN EXTREME CASES, TO A CABLE FIRE BENEATH THE INSTRUMENT PANEL IN THE PASSENGER COMPARTMENT. Remedy: DEALERS WILL RE-ROUTE THE WIRING HARNESS. OWNER NOTIFICATION SCHEDULE BEGAN ON MARCH 29, 2004. OWNERS SHOULD CONTACT PORSCHE AT 1-800-545-8039. Notes: CUSTOMERS CAN ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATIONS AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236). Make : PORSCHE Model : CAYENNE TURBO Year : 2004 Manufacturer : PORSCHE CARS NORTH AMERICA, INC. NHTSA CAMPAIGN ID Number : 04V071000 Recall Date : FEB 16, 2004 Component: POWER TRAIN:AUTOMATIC TRANSMISSION Potential Number Of Units Affected : 4099 Summary: CERTAIN SPORT UTILITY VEHICLES MAY HAVE HAD A TRANSFER CASE INSTALLED THAT COULD, DUE TO CHANGES IN THE HOUSING CASTING, RESULT IN THE OIL PUMP ROTATION. SHOULD THIS OCCUR, OIL STARVATION OF THE INTERNAL GEARS MIGHT RESULT. Consequence: CONTINUED OPERATION OF THE VEHICLE COULD RESULT IN A FRACTURE OF THE TRANSFER CASE HOUSING. INCORRECT TORQUE WOULD THEN BE APPLIED TO THE DRIVEN WHEELS OR OIL COULD LEAK AND CONTACT THE TIRES. Remedy: DEALERS WILL INSPECT THE TRANSFER CASE HOUSING AND, IF NECESSARY, REPLACE THE TRANSFER CASE. OWNER NOTIFICATION BEGAN ON MAY 3, 2004. OWNERS SHOULD CONTACT PORSCHE AT 1-800-545-8039. Notes: CUSTOMERS CAN ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATIONS AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236).

The sensors wear at the same rate as the pads. Once they get to their critical stage, the metal contact within begins to touch the metal disc - completing an electrical circuit that results in the warning light you'll on the dash. Replacing them is prudent if you are doing the pads as well.......that way you know.

In rare instances, the pressure plate diaphragm can also crack - which will result in the situation you describe. Due to the nature of the inherent "spring" of the formed/domed pressure plate, any failure tends to be immediate rather than progressive.

Check the engine and gearbox rubber mounts to the vehicle frame..........

If no one has the answer on this board, go to www.pca.org They have an excellent tech section - you can write to them.

There is another solution.......anyone who has - or has had a Harley Davidson should know that there are a multitude of exhaust shields that attached to exhaust manifolds......they come in all sorts of lengths etc., and since I asked this question long ago, it could be a reasonable solution. They allow moisture to move past the manifold - negating the issue of rust and corrosion, they come in many lengths - so fit in critical areas should not be that much of an issue.........they are a little expensive though - chrome plating may or may not be the look under the manifold.

Many have complained about the lack of gusto with the standard V6 Cayenne........even with a 6 speed, the amount of rowing you'll have to do to make it move may be a little tiring. The S would be the failsafe way to go.........it may even be nearly as fuel efficient as the V6 considering you won't have to ask so much of it to get it moving..................

Sometimes it takes quite a while for them to iron out. Washing the car seems to help - expands the roof fibers and when they dry, they seem to dewrinkle themselves over time. Keeping the top up when parked in the garage will also help - the trick seems to be to keep the roof tight at all times, except when you are enjoying the sun.

Images would help a lot.

The "O" ring comes with the filter in the box - it seals around the top of the plastic filter cannister you have to remove to take off the filter - you don't have to replace it, but since it comes with the filter anyway, it's good insurance. You'll also need the new aluminum sump plug gasket - this is a part that will have to be purchased.

A recent Motor Trend here in the US showed a photo of the new 997 Targa. The article suggested there would be about 10 new Porsche models by 2010.........the image of the Targa seemed to suggest it may be closer to production release..........talk to your dealer about it now!

From what I understand, all engines are returned to Porsche for any rebuild work. Spare crankshafts, rods etc. are not available as spare parts. I also have read through the service manual, and with all the critical tolerances that need to be measured and considered, I feel this overhaul would be a challenge to even a genuine Porsche dealer technician.

First thing to check is your gauge.........they can be off by several psi. Buy a good quality dial gauge - Porsche has one. Wearing out the center is usually caused by over inflation.......or maybe in your case very high road speed as the center of the tyre does centrifuge out a little further than the sides due to wheel speed and flex across the tyre tread. As for the Michelin question - look at www.tirerack.com - they have lots of user reports on various tyre brands and this would also be a worthwhile place for you to do more research - pricing will not be for the UK - but once you've narrowed your choices you can shop around for the best Euro deals.