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ar38070

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Posts posted by ar38070

  1. Toe can be be either toe in (negative numbers) or toe out (positive numbers). The Porsche spec is for slight toe out. Toe out, generally speaking, makes the car less stable in a straight line. Toe out in the front helps to turn the car. Toe in in the front helps the car track in a straight line. Toe in in the rear helps the car stay in a straight line under acceleration. Excessive toe (in or out) increases tire wear as in general the car spends most of its time going in a straight line.

    Your alignment will be a compromise balancing tire wear versus performance.

  2. I'm a retired Mobil Oil exec who's also into Porsches.  I just visited Zuffenhausen in July.  Each engine is tested with and refilled at the factory with Mobil 1 0W-40.  Despite the fact that Porsche doesn't know the ultimate operating destination of each vehicle.

    Porsche and Mobil developed the 0W-40 jointly.  And as noted above, "I would stick with only what Porsche recommends".

    And our research folks do too.  I was chided by the head of Mobil 1 research for mentioning that I would put Mobil 1, 15W-50 into my 997.  He said that the 0W-40 is the oil to use.  (Suspect that it has something to do with the hydraulic lifters, but don't quote me.)

    Does us a favor. Ask your research guy for details. It may finally settle this question at least until the next great oil comes out.

    Things I would ask:

    What if the car is run in very hot weather, 90-120 degrees?

    What if the car is a track car only? Car is at/near redline most of the time.

    Is it truly the lifter issue? Before 2000 there was no 0W-40. 15W-50 was a recommended oil and now it is not, why?

    There is a 5W-40 "Truck and SUV" formulation. It has applicable API certifications but not ACEA. Is this a viable alternative? If not why not?

    Thanks for any clarification that you could provide.

  3. The second gen PCCB are no better as far as wear. Their only advantage is cost.

    You can use either the stock GT3 rotor or the motorsport GT3 rotor. The motorsport for some strange reason is cheaper.

    I know of two places to get floating rotors. The first is Sunset Porsche. They have just started offering it and it is pricey. The starting price is about $800 per rotor. The replacement iron is about $300 per rotor. Another company that I know of (I do not remember the name at the moment) the price is about $600 per rotor to start and $250 for the replacement iron. Both offer solid rotors with slots (which is the way to go IMHO) and rotors with holes. I do not believe the unnamed company has actually produced yet, still waiting for enough interest to do a production run. Also the Sunset rotors are direct replacement. The unnamed ones require that you use spacers to push out the caliper.

  4. A lot of the people out here on the left coast have swapped at least the fronts out for iron. If you use them hard you will find that they will start to flake or pit. You will see this start to happen within 10 track days.

    Many people have had them replaced once by Porsche under warranty. After that you are on your own.

    If you want more stories search on PCCB on rennlist and 6speedonline.

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