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I've read about carbon build-up... how serious is that with CS' DFI? Any VIN related problems? What problems to consider?

A CS might well be an option for me.
 

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Yes, 1 problem... it handles really sweeeeeeeeet.

Just buy it and enjoy, I've yet to see any forum member with a major problem.
 

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No major issues, but you are correct about carbon/soot build-up. I suspect that the fuel/air mixture runs rich much of the time. It's hard to keep the stainless steel tips of my Borla exhaust clean - after a few drives they're covered in black soot.
 

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Other than not blowing up on track and not cracking power steering lines.... they have some minor high pressure fuel pump issues. Sorry, I couldn't resist.
 

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Just buy the best fuel all the time and you'll be OK. I use Chevron 94 AKI. 2010 Cayman S is a dream come true!:banana:
 

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Just buy the best fuel all the time and you'll be OK. I use Chevron 94 AKI. 2010 Cayman S is a dream come true!:banana:
Fuel grade does nothing to improve or worsen the amount of soot the engine produces.
 

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Fuel grade does nothing to improve or worsen the amount of soot the engine produces.
I'm betting high quality fuel will reduce risk of HPFP failure. Soot out the back in is no big deal but crud going thru fuel pump is. Just my HO but admittedly I have no observed data to substantiate my point. Do you have data to back up your post?;)
 

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I find the Torque below 4000RPM seems weak. Anybody else find that???
 

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I find the Torque below 4000RPM seems weak. Anybody else find that???
Yes, same here torque below 4000-4500 is weak and thats why I would like to try out a 911 Turbo but I am afraid that if I do it may cost me a bundle! From a stop the CS is slow but at higher RPMs there are no issues! Its not a 0-60 car.

Mine has been flawless except for the CDR-30 (radio) being replaced because the CDP wasn't working......better the CDR-30 than mechanical.....
 

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I'm betting high quality fuel will reduce risk of HPFP failure. Soot out the back in is no big deal but crud going thru fuel pump is. Just my HO but admittedly I have no observed data to substantiate my point. Do you have data to back up your post?;)
No empirical data, just anecdotal - I've used pretty much every brand of premium fuel in my car, from Chevron to Shell to Costco to Arco, and even filled up the tank with 100 octane race gas a few times. I haven't noticed any difference in the amount of carbon buildup on the exhaust tips.
 

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A first the soot made me worried but now have accepted it. As long as it doesn't build up in the engine its not a problem. The recommendation from a Porsche aftermarket specialist that repairs Audis as well is to drive it like its meant to be driven and to do oil changes every 5,000 miles and the carbon build up will not be an issue. He also recommended BG44K to keep the engine clean. In case some are worried about using it, my delearship sells and recommends it as well. They said they use it as part of the oil change deal.
 

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Other than not blowing up on track and not cracking power steering lines.... they have some minor high pressure fuel pump issues. Sorry, I couldn't resist.

Just nothing that has made the web. Both of the (non) issues you mention have occurred is Gen 2 dedicated track/race cars.

Cheers,
 

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No empirical data, just anecdotal - I've used pretty much every brand of premium fuel in my car, from Chevron to Shell to Costco to Arco, and even filled up the tank with 100 octane race gas a few times. I haven't noticed any difference in the amount of carbon buildup on the exhaust tips.
It was a local shop that suggested I use the Chevron Fuel. He claimed poor fuel quality in our area was responsible for general fuel pump failures. Since concerns have been raised about potential HPFP failures with the DFI motors, I decided to go with his advice purely empirically.You might consider this the automotive version of Pascal's wager-I figure I've got nothing to lose and potentially much to win if I behave myself and feed my Cayman only the good stuff. I also have lots of soot on my lovely exhaust tips so obviously the Chevron fuel is not preventing that problem.
 

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I use and recommend Top Tier gasolines:

Top Tier Gasoline

I also change the oil & filter every 6K, obtain an oil analysis from Blackstone Labs, and put a can of BG 44K fuel system cleaner into the gas tank every 12K miles.

Anecdotal evidence only, but have never had a fuel system problem. Seems like cheap insurance for such expensive vehicles. YMMV. Dave
 

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A race engine only has to last the length of the race the car is running in. Race engines are regularly rebuilt. If you want to treat your street engine like a race engine you better expect to rebuild it. And guess what? All street engines will eventually have to be rebuilt!!
 

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I wouldn't compare a street engine that does 90% street / 10% track to a race engine. Now if you're CS is exclusively track only (as some are....looking at you Krokodil), yes, I'd apply the rules you mention.

For me, the expectation of a solid well built motor is that it can handle the occasional track day without grenading. Personally, I don't think that's unreasonable. I've owned several cars and tracked them regularly without the need for a new motors during their lifetimes. My EVO made it to 68K at 120hp over stock before I sold it and it still threw stock compression figures +/- 1PSI. I think the general public's acceptance of major component failure at less than 100K miles is kind of sad. When I see people brag on car boards that "my car has 20K miles and no problems yet (yay!)" it makes me scratch my head. Engineering has gotten much better but peoples expectations have gone much lower. Go figure. /soapbox rant
 

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Not a 0-60 car!? 4.3 seconds sounds pretty damn good to me (see Car and Driver this month).

I drove nothing but muscle cars for the last 17 years and my CS's power does not disappoint!
 
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