Originally Posted by TurboGTO

KP, you are absolutely right. I don't think I will ever master all the acronyms out here. I thought people were using D1 & D1SC to refer to the same blower.

ATI does make a D1 and a D1SC and both are still available. The D1 is an old design, oils via the motor and according to ATI is considerable louder than the D1SC which has self contained oiling(hence the SC). I think this explains why some people are saying the D1 is really loud. My fault.

Gears aside, I think the main reason the Vortech is so quiet is that it uses the stock GM air filter box, which was undoubtedly designed to be extra quiet.

Originally Posted by DeltaT

That was my point above. Vortech doesn't advertise it, but they do make a V-2 SQ (Superquiet) T-trim that would be a good choice if you added your own FMIC.

I also have a G-body with a custom A2A FMIC that I am in the process of going from a V-2 SQ S-trim to a V-2 SQ T-trim.

Jim

My Sleeper Site: http://home.mindspring.com/~jim_fisk/id1.html

Originally Posted by TurboGTO

My H/C upgrade left something to be desired, so I have contacted Bob at EPP for a Procharger install. Goal is 500 RWHP. He feels this is a safe streetable number for a stock bottom end. I really want to keep the car quiet(still has stock exhaust). I'm old. What can I say? Flame me if you must.

Anyway I know the Vortech S/C stuff is quieter than Procharger, but I don't really like the Vortech blower placement or the air/water intercooler.

My question: I must decide between the D1 & P1. Bob says both blowers will make the number easily and he feels I may as well go D1 as it is only a few hundred more.

I personally heard a P1 on a brand new Vette(automatic car) out at ASSC that they just finished up. I could hear the rattle from under the hood, but not from inside the car. I could hear the whistle everywhere, but it wasn't too bad.

I have never heard a D1 in person. Is the D1 louder than the P1?

Do you guys know any tricks for quieting them down? I have heard more bends in the inlet tube quiets down the whistle. Will the SDCE bracket help? Any ideas?

Thanks!

Originally Posted by TurboGTO

Thanks Packy. I thought for sure you were gonna go for another blast around the parking lot. Normal driving noise is what I'm interested in.

Someone told me that the Vortech Race Bypass Valve would be quieter than the stock Procharger valve. I guess I'll just let Bob fiddle with that tuning stuff and get it as quiet as he can.

I still have to tell him P1SC or D1SC. ATI tells me the P1SC and D1SC use the same compressor housing, but the PISC uses a cut down compressor wheel from the D1SC and that the D1SC uses tougher bearings. Obviously the D1SC would be spinning slower than the P1SC. Any thoughts which one would be quieter in a stock type 7-8 psi configuration?

Originally Posted by Packy

I think that they both sound the same. My buddy used to have a D1 and mine was louder than his. I had a 3.7" pulley on mine and he had a 4.0" on his. We made the same thing powerwise.

I say get the D1-SC because it will allow you room to grow if you desire. I wish that I had got the D1-SC...

If you get it and don't like it. I will trade my P1 for your D1.

Originally Posted by TurboGTO

OK Bob,

I'm leaving my Camaro in your hands. You know what I want. Make it fast and keep it quiet.

I'll call you tomorrow.

TurboGTO

BTW: Can I still get a ride in that wicked Vette that's always hanging around your shop??