Plenty warm. Had been on the road for 30 minutes or so prior (streets and fwy). At this point, I'm beginning to think maybe I actually did hit the rev limiter. What's top speed in 2nd gear?

 

AP2? High 50s.

 

I don't think it's VSA. I took the car to local track and saw VSA blink many time while in the turns. It did not feel any jerk at all just no power. I can assure you that when VSA off it's completely off. I turn my VSA off in auto-x and I did 270 in a big sweeper.

 

if you are in a turn way too hard, while still on the gas, it will feel like you hit a rev limiter, but just for a brief second until the car straightens out. and for the people that have never experienced it, its not violent, its a slight drop in engine power. i love vsa, its a great peace of mind, and works so wonderfully when it doesnt have to correct the oversteer much.

 

Like mentioned above, your case definitely doesn't sound like VSA doing its job. When i usually provoke the VSA, i'm entering a turn pretty hard and throttling thru the entire turn. Once i pass the threshold point of the tires gripping the ground, the car begins to slide a lil and then vsa corrects the oversteer in a very subtle way like stated above. It just feels like the car all of a sudden had the speed reduced just a tad bit in a gradual manner and it feels like the car has been mounted onto rails. Nothing severe like how you've mentioned.

 

Try it again in the same place and see if it does the same thing

 

My 06 will do exactly as the OP describes, usually in a very, very tight turn -- like a 10-15 mph switchback. I have also had it do this on The Dragon when I tried to stomp the throttle too early in a turn. And yes, the VSA light flashed. At higher speeds or larger turn radii, the VSA action becomes more subtle and will let the tail hang out quite a bit. The low speed behavior is the only "flaw" in the VSA system.

My guess is that the yaw rate sensor thinks that a really tight turn is an incipient spin. Smooth driving, avoiding sudden steering or throttle inputs, seems to avoid the problem -- just like your autocross instructor would tell you.

 

Hence my post
I had the same thing as the OP doing the switch backs in the Swiss Alps in my 06

 

I wish I had VSA. Maybe in a few years I should trade my 01 for a newer S2k

Sorry that doesnt help, but I had to share that.