Nineball,
I'm not sure exactly what is going on with the stock Gen 4 clutch, but it does have some sort of flaw. Mine was very eratic in shifting and I even had some slipping issues. Hardest I ever ran it at the drag strip (3 separate times, stock tires) was a 1.8 second 60 foot time at 11.55 second ET. I purposely left soft as to not go below the 11.50 second rule and get kicked out. I've done about 5 autocrosses and the rest is spirited driving...again all on stock tires. I replaced the clutch with the BBG unit and the difference is night and day in shifting. The car revs a little faster and has better compression braking due to the lighter weight. Another thing I noticed is when pushing the car hard at the top rpms in 1st through 3rd gear the car is still "pulling"....before it would sort of wind out right to the rev limiter. Sounded very fast but now looking back at it and comparing it to the new clutch, I think I was getting slipping at max power. I wish I had some sort of data logger to verify this, and for me stuff is happening pretty fast at those rpms, so like I said, I thought I was pulling hard.
Just to clarify, there is only one replacement clutch that is tested and authorized by Dodge for the Viper Cup race series in the ACR-X and that is the BBG unit. Since every winner this season has been running it, I would be highly suspect of the stock clutch for "spirited" or higher horsepower adventures.
Good Luck,
George
