Supercharging with-Holley VS- Maybe NOS?

[BadNewsBears]

Ok I want to run a supercharger on a Holley Vacuum Secondary, possibly with NOS. EIther on a 455 sd big block Pontiac. OR a small block..Just go with the SD for reference. How do I do it? Never used a turbo. WHere do I start?

 

[notfred]

you're way out of the league of this forum. There's only one guy on here I know of that can help you with supercharging big Chevy engines like that.

If you were supercharging a fuelie Ford smallblock, I could help you out

 

[BadNewsBears]

Is it....Cavemanmoron ??

 

[Angrymarshmello]

LAUST

 

[notfred]

Originally posted by: RagingBITCH
LAUST

yep.

 

[Kadarin]

My suggestion would be to grab yourself one of the HP Books or SA Design books on supercharging/forced induction. That way, you get a good dose of theory along with practical application, and you're better prepared with knowledge when it comes time to make any purchases. You'll also know whether or not it's a good idea to run nitrous oxide in conjunction with a supercharger, and you'll know how to build the engine such that it can withstand the additional horsepower.

 

[Soybomb]

heh yeah laust will be the man for this, but I can say I don't care for nos, I don't like for my speed to run out or need a refill

I prefer turbos over supers but have no idea which is easier on your engine

if you decide to turbo charge a dodge though let me know

 

[Shockwave]

I prefer superchargers. Quicker response (Generally, depends on the type)
No lag is good.

But, nothing quite sounds like a turbo spooling up. Damn I love that sound.

 

[desertdweller]

Originally posted by: Munchies
Ok I want to run a supercharger on a Holley Vacuum Secondary, possibly with NOS. EIther on a 455 sd big block Pontiac. OR a small block..Just go with the SD for reference. How do I do it? Never used a turbo. WHere do I start?

You need to decide if you're going to be using a turbo or supercharger (big difference).

You don't seem to know a whole lot about it, so make sure you do a whole lot of research.

You need to understand that you will need to build the motor specifically for forced induction/nitrous.

455 is a stout motor, but if you want any longevity out of it, you need to have it balanced and
blueprinted.

Probably the best thing you can do, go talk to the guys at your local hotrod shop and tell them what you
want.


DD

 

[Soybomb]

Originally posted by: Shockwave
I prefer superchargers. Quicker response (Generally, depends on the type)
No lag is good.

But, nothing quite sounds like a turbo spooling up. Damn I love that sound.

It all depends on the turbo, one of my cars spools up like lightning and reaches less boost 14.7 psi tops, the other has a bigger turbo and takes a bit longer but hits more boots (roughly 20psi ) THe 14.7 psi has little lag

 

[BadNewsBears]

455 will have wiseco forged pistons, and some nice Brodix heads. I am no numb nut. I should pwn a hot rod shop. Just never got into turbo/supers' .I know supers have no lag have way more torque and kick off w/ no boost @ 5000 ish . Turb is like the opposite and wityh lag. The 455 SD is damn sturdy enought to handle anything i throw at it. Id probably get a turbo, get one of those things..(break off cap or somn) so i can adjust boost by switch in the cab.

 

[BadNewsBears]

The nos is a BIG maybe

 

[Rent]

Laust would be the one to ask. You should lay out some ground work for what you want I.E. what type of blower and what type of power you want it to make.

 

[WinkOsmosis]

How about NOS with Holley? NOS is Holley.

 

[BadNewsBears]

Jello..Im aware of that..SO is hooker and many others... Im just saying i want to use it ON A HOLLEY CARB...aka a Holley

 

[JC]

I wouldn't go the turbo route. The ultimate would be a centrifugal supercharger with fuel injection, haven't seen it for a Pontiac (maybe TBI from Edelbrock, though?). The pressurized carb isn't the best setup, but it'll work. I'd only add the nitrous if the blower doesn't provide the kick you're after (but it prolly will ).


edit: Here's a good start.

JC

 

[LAUST]

Here is a centrifical Supercharging solution for a BB GM Centrifical are the best blowers for high end, they begin their boost around 3000RPM and can reach very high levels of boost.

The other two choices are Roots (Weiand) or a Twinscrew like I have (Whipple)

Whipple for BB GM Carb Whipple is a great option for gobs of torque that is needed for Boats and Trucks, as far as for car performance the powerband will taper off in the upper RPM range and most cars just go up in smoke off the line with em also, I wouldn't really run one outside of Marine or Tow use.
Roots (Holley / Weiand) Blowers are the famous Hot Rod blowers you see on most classic cars as they support Carbs more then the other 2 types. Roots are also used on new vehicles like the Lightning and the Pontiac/Buick cars with factory SC's. They last a long time before they need rebuilds (Gaskets and Brushes) also. In most cases they are also the least expensive.

I would not do a Turbo on your setup, Turbo's can be great for many applications especially Diesel because of it's disreguard for heat and 4 and 6 cylinder motors because they don't have the engine power to drive the SC like our V8's do. But with a 455 you have more then enough for a good Supercharger.

Also before you do the NOS I would get a supercharger on the car and fine tuned then wager if you even want to add it.

 

[Howard]

Correct me if I'm wrong, but Roots-type and twin-screw/Lysholm superchargers provide exactly the same pressure no matter the operating speed, right?

 

[LAUST]

Originally posted by: Howard
Correct me if I'm wrong, but Roots-type and twin-screw/Lysholm superchargers provide exactly the same pressure no matter the operating speed, right?

My whipple is pretty Flat, right now in the winter I run a 5lb pully vs in the summer when I run 8lbs... right now once the throttle plate opens I hit 2-3lbs right away, I don't get my 5lbs till about 1600RPM-1800RPM~, then it's flat until I shift at 6000rpm.

 

[Howard]

Are you running a carb?

 

[LAUST]

Originally posted by: Howard
Are you running a carb?

Stock F.I. on my truck

 

[BadNewsBears]

But Laust its a already a torque MA-CHINE. I keep thinking turbo because, of a better top-end.?? I have -no-clue right now

 

[JC]

Then maybe just get the Juice.....it'll give you all the top end you can handle

JC

 

[LAUST]

If you want to keep useing your Vacuum carb you cannot use a Turbo or a Centrifical supercharger because you are pressurizing the carburetor, on a roots a vacuum carb works great because it sucks from the bottom just like a N/A engine.

 

[ScrapSilicon]

Originally posted by: LAUST
If you want to keep useing your Vacuum carb you cannot use a Turbo or a Centrifical supercharger because you are pressurizing the carburetor, on a roots a vacuum carb works great because it sucks from the bottom just like a N/A engine.

vacuum secondary carb= no good but the Whipple design originally did do TBI 350 Chev trucks ..as for the Pontiac unless you girdle it and use h-beam type rods keep your rpms under 6500 as these engines were not engineered for high revs ..mostly for big cu inches for more grunt to get the land barges rolling(p.s. the Pontiac 455 is a small block )