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The only comment I have on 0-60 times is this.
When GM got those numbers I am sure it was with a professional drive, in ideal condtions.
Remember it is 90 degrees and 75% or higher humidity out there almost every day right now.
In the south central and southwest I am sure it is 100 and 100 or more. Thus you car is being robbed of anywhere from 30 to 50 HP from the weather (easily, and I will post evidence of this in my very next post). This is why the dynojet has weather corrections so it can give you repeatable corrected numbers wherever you are and whatever the weather is. In the winter months if I do an uncorrected dyno sheet I can see 20 to 30HP at the tire more than the corrected value, in the summer, I can see 20 to 40HP (and torque) at the tire LESS than the corrected values. Thus your car will be slower in the summer as it makes much less power. Wait till November when it is 60 degrees down there and very little humidity and make sure the car hooks up well and I bet your 0-60 times are MUCH better.
I'm not in any way defending GM, but I feel this car is doing as advertised and the L99 I rode in on Thursday night felt VERY strong (it was tuned already though). This wednesday when I do a second one, maybe I will go ride in it as is first to get an unbiased opinion.
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