Low Boost 347

[ka67_72]

How can I tell if a blower belt's slipping? I'm working on my first real customer car so I'm trying to get it right.

Here's how it arrived:
All forged 347
Trick Flow Heads 170cc runners, 61cc, 2.02/1.60
Trickflow Street Heat 75mm upper and lower intake
75mm TB
80mm MAF
50 lb injectors
a used Powerdyne BD-11, 12PSI pulley
Comp Nitrous cam .555/.570 http://www.compcams.com/Technical/Se...umber=35-556-8
Flowtech long headers
3" X pipe
Flowmasters
old piggy back computer
a disappointing 374 rwhp with 8 psi pulley

He wants 500 rwhp and suspected the computer.
I've installed and tuned an AEM computer to 12.7/1 A/F with an AEM uego gauge, installed water injection, and talked him into a boost gauge.

I haven't built a dyno yet so I'm tuning on the street. My only experience has been with turbos, but I was expecting the blower to peak at 9-10 psi with the better top end. As far as I know it was dyno'd without a boost gauge. My first time out it was only making 2 psi at 5000. With a short wrench I could easily turn the blower pulley so I replaced the belt. Now it's only making 5 psi at about 2500 and carries it through 6200. I'm still suspecting the belt because the idler's maxxed out, but I couldn't get a 1/2" shorter one on. I don't know if it's making more power now but it will light the tires at 70. He brought a vortech V-1 T, with chevy brackets, and we've talked about intercooling, if the powerdyne isn't enough. Any advice would be appreciated.

Thanks,
Kevin