For anyone that is interested, I've posted a speedo video in HD of my car stock and with the supercharger. In the supercharger video I have RSC Cats and stock muffler. You can hear the in-cabin sound difference.
RSC Cats gives the car an extra snarl! See the links below and click "HD" in lower right corner of video.

Stock:
http://www.youtube.com/watch?v=hpdt_...e=channel_page

Supercharged/RSC Cats:
http://www.youtube.com/watch?v=UGiZn...e=channel_page

 

Great videos...thanks for posting!

As an aside, it's amazing how much lag there is on the digital speedo...I've noticed this and it's a real PITA. I wish there was a way to fix it...on hard acceleration, it's not unusual for the digital speedo to lag 6-8 mph behind the analog gauge.

 

Here is the video comparing them, stock on the bottom.

http://www.youtube.com/watch?v=-bVHs...e=channel_page

 

Yeh, it is a PITA. It was the same way with my Porsche GT2. At least Aston Martin's speeds are accurate. All my Porsches were very "optomistic", usually by over 5mph at high speed.

 

Interesting comparison. Is there a lot of traction limitation through the first 3 gears? Your car now has about 200 hp more than when it was stock, yet the difference is speed between the two doesn't get over 10 mph until 4th gear. I know it's very quick, but that doesn't seem like as much of a difference as you'd expect. It will be interesting to see a fresh video once you put on wider rear tires.

This is why I'm a fan of the twin-screw SC, although I completely agree with you that the lack of an intercooler has the potential to be a problem. I think the "area under the curve" will be better with increased power over the entire powerband resulting in better gains, compared to the centrifugal setup which doesn't get going until 3500+ rpms. Even if it doesn't put out as much max hp, it could still be faster. I guess I'm just going to have to be patient and see what the best option is once they're all out for comparison.

As for the speedo, I would prefer it if it was a bit optimistic. I think the lagging digital speedo accounts for why many people say the car feels and sounds fast until you look over and see you're only going 40mph. You may be going 50 as it turns out, but the lagging speedo numbers make it seem slower. It's the opposite of the way German cars do it, and that probably contributes to making it seem even worse.

 

I thought it would be interesting to take the GIAC 7000 rpm 997tt tip video(posted in 997tt section) and compare that to the SuperVantage. Obviously there is a lot of potential error, but after normalizing/equalizing the starting speeds, both cars hit 129mph at exactly the same time! The 997tt has an engine flash and exhaust as well.

http://www.youtube.com/watch?v=vfngeGmVZsU

 

Nice comparison, thanks.

 

Thanks for posting the comparison video. It offers a fresh perspective into the potentials of the system.