Here are the before and after slips from running the SRT-6 Convertible. DA was similar both days, around 2,300 - 2,400 feet. I installed the pulley's and ecu.

Before/After

60' 2.006 1.92
330' 5.74 5.50
1/8th 8.78 8.47

I picked up 1.5 mph as well. Car picked up .3. I didn't try to kill the launch. I left at 1,500 - 1,600 rpm's. Let it shift itself. I was about 3/4 of a tank of fuel. If I really messed with it, I could have dropped another .15. When correcting for air and running the 1/4, it should run 12.90's or so. Not to bad.

 

here's a cool calculator for estimating your HP from 1/4 mile times.

http://www.speedworldmotorplex.com/calc.htm

12.95 sec in a 3,300 lbs car = 300 hp at the rear wheels and 354 hp at the flywheel.

 

Using mph is a better indication of hp as it takes away the error of tire spin or a poor launch.

 

I'll post the video at some point later, my connection sucks right now.

 

This guy has been around more drag racing than the rest of us combined. He's got a good idea what the conversion would be.

 

I'm having the transmission for my SRT-10 aired in tomorrow. I hope to make a run in it on sunday. Been 10 months worth of work. Of course, it's on stock tires so I'm not expecting anything but tire spin. If I can spin the tires all the way down the track and still run in the 8's. I'll be happy.