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Airiscool

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Airiscool last won the day on February 10

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About Airiscool

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    PCA (Porsche Club of America)
  • Present cars
    Air cooled twin turbo
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    Water cooled
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  1. I was able to confirm that the Cayenne (958) 8-speed auto/Tip box is made by Aisin in Japan. I wonder if the OE fluid supplier is a European or Japanese company? My search continues
  2. JFP I don't disagree with anything you said and no doubt damage can be done by using the wrong fluids or lubricants in any mechanical device, but once one understand the properties of the fluid(s) in question and they match or exceed the OE specs and performance there is no shame in using something other than OE. I am not sure what Porsche's current recommendation is but for quite a while they spec'd Mobil 1 0W-40 for all air-cooled 911s and you don't have to search very hard to find a large number of experts that will tell you there are superior engine oils for these air-cooled engines. Brake fluid is another example - why not use something like Motul 600, Castrol SRF or Endless RF650 (Porsche Cup car spec!) rather than generic not-made-by-Porsche Porsche-lebeled DOT 4? These special fluids might be more hygroscopic than the OE fluid, requiring more frequent changes, but one shouldn't be chastised for using any of these fluids in a Porsche because they certainly aren't inferior. I will continue searching until I find the OE manufacturer of the ATF that Porsche sticks their label on, then I will compare the specs to the other available options to determine what to use in my 958TT. If I find a fluid that I like better than the Porsche dealer fluid and it costs more than the Porsche fluid I will gladly buy it. Since you know these rigs well can you please confirm if the transmission is made by Aisin or ZF? Regards
  3. Yes - go with 22x10.5" wheels and 285/35R22 or 295/30R22 tires all around. If you are able to specify the offsets, and assuming your S doesn't have extended wheel arches, I would go et55 front and et50 rear.
  4. 22x10.5" rear wheels will fit fine on the rear with an offset range between +45 to +55. The tire sizes you listed aren't appropriate for any Cayenne - these vehicles require the front and rear tires to have exactly the same overall / rolling diameter; the tire sizes you listed have very different overall diameters. The most popular 22" sizes are 285/35R22 or 295/30R22 for use front and rear.
  5. Me? Where did I ask about "cheap unknown spec lubricants"? It is easy to find the exact specs for both of these fluids and anyone that hasn't heard of Febi Bilstein or Fuchs must have limited knowledge of European fluid suppliers. Can we all agree that Porsche doesn't produce ATF fluids in-house for the transmissions that they outsource from another vendor (Aisin or ZF....TBD) ? With that in mind, putting some effort into locating the original supplier/manufactuer of the fluid that Porsche specs for this 8-speed is hardly a foolish exercise, especially since we are talking about 8L - 9L of fluid at a $30 - $40 per L saving. Sounds like a sensible exercise to me. In my experience it usually possible to find a non-OE fluid (engine/trans/diff/brake) that is superior in quality to OE fluid (better base stock, less shear, higher VI, etc) for the same or less money. Car and Driver: "As with all the other gasoline engines, power is transmitted via a completely new eight-speed automatic transmission sourced from Aisin that shifts quickly and very smoothly." Road & Track: "The Aisin 8-speed Tiptronic automatic transmission eliminates the need for a low-range transfer case within the Cayenne's new lighter (surprise!), on-demand all-wheel-drive system, while Porsche claims faster (albeit imperceptible) shift speeds over 8-speed on-road-only gearbox." Maybe both sources are wrong?
  6. Which ATF fluid are 2011+ Cayenne owners using? The dealer fluid is horrendously expensive but there seem to be a couple of OE-alternatives at a fair price. Febi Bilstein Part #:958 300 540 00 Cross Ref: 29934 Fuchs Titan ATF 4400 Part #:958 300 540 00 Cross Ref: 600705626 Of the two the Fuchs appears to be the most OE-ish and might actually be the factory fluid in a different container??? Pelican says "Fuchs Titan ATF 4400 is an OEM supplier to Porsche." Can anyone confirm if 8L is enough when doing a gravity drain + fill ?
  7. With no warning my '08 CTT with 70k experienced the dreaded 'Coolant fitting blowing out of coolant manifold on the back of the engine' problem. What next? The coolant reservoir or maybe the coolant pipe under the intake manifold?
  8. Thanks for adding to my list. I just checked the price for a new alternator - scary! Why on earth is it three times the cost of most German car alternators? Does the exploding coolant reservoir give any warning signs before it lets go and at eight years and 70k miles should I replace it now?
  9. I am a bit OCD about reliability and not having my family stranded on the side of the road! On this note I am willing to spend some money in preventative maintenance and repairs to buy more peace of mind. On a 2008 Cayenne Turbo w/70k what are the top five common failures that could leave me stranded? Let's leave flat tires and running out of fuel off the list! Here are some of the weak points I am aware of: -Coolant fitting blowing out of coolant manifold on the back of the engine -Plastic coolant pipe under the intake manifold failing -High pressure fuel pump failing -Air suspension pump or airbag failing What else should I add to this list? I recall reading somewhere about the ignition switch or steering column switch failing and leaving the vehicle inoperable. Advice would be appreciated.
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