Thinkin' I might super charge andhave some questions? Who is supercharged 305 TBI only
Thanks Scoty

 

what kind of supercharger are you thinking about?

roots or cernterfugal?

i haven't done it yet, but i plan to run a roots blower with TBI. i know there is at least one guy running a pro-charger centerfugal with TBI.

 

supercharging it not going to be worth it on a stock 305. For the 3K you spend, you could get heads, cam, intake, bigger TBI and injectors, headers, hi flow cat, cat back, 3.73 gears, posi and a Torque Converter. All that would definately make your car go faster than a supercharger.

 

I'm not planning on supercharging right now. I am going to do the top end and suspension mods now, I was just wondering about it for later on. centrifugal is what I'm after.

 

what kind of powe numbers can be reached by supercharging the 305.

 

I would say maybe 400HP after supercharging an engine built up to 300HP all motor. 30-35% increase in power. If you go to Vortec website, the TBI trucks went from 210HP to 285HP with the supercharger, but that is a 350.

 

I wouldn't mess with anything but ATI procharger with a intercooler. Its not that much for the kit either it has a 1 year warranty and it boosts HP 50-85% or more if you get a bigger system.

 

Mylilbowtie do you know why the prochargers come with an intercooler?? I used to think that they were the best and was never planning to ever run anything else, however my buddy did some research and found out that the procharger is the only centerfugal supercharger that isnt helix cut resulting in a much higher discharge temp. Its like the differance between a screw and roots supercharger. I didnt make this statement to put a bad light on procharger just give yall some info. In the mustang world guys are able to put down the same #s on either a novi 2k or a good vortec without being intercooled. like i said before i dont want to sound like im putting procharger down just some info. If I was going to put a blower on a small block I would get an aftermarket manifold like a performer rpm or maybe a victor jr an have it fitted with injectors, any stock intake just seems way to restrictive to bother spending 3000 for only a 30% gain

Graham

 

I have been talking to the guys at whipple superchargers. They advertise 50% more hp and tq. When I asked them they said those numbers are acheived at their recomended 6lbs boost. They also "claim" to have the coolest charge of any blower. Many people dont like whipple but they did give me this in writing plus they are smog legal for 454

Charlo

 

the whipple chargers are very nice, the just cost more $$$ that a roots, i have thought about going that route before, it is easy, and the whipples perform well, but i don't know that i want to spend the coin for it.

 

There are a few people that have gone the centrifugal supercharger route here on their LO3s, but from what I gathered, most were not happy with it. Granted, a few of those were on more-or-less bone stock motors and you will see much better #s if you have worked the top end over, but I dunno. It seems like the LO3s really like nitrous for some reason, but not boost. I suppose the first step you are gonna take in all this is to lower the compression via some heads with 64cc or larger combustion chambers, correct? If I can find the thread I was reading (on the power adder board I think) I'll point you to it. Seems like some people thought that a better cam grind with more lift/duration on the exhaust side would really make a supercharger worthwhile on a 305, esp. if you've got headers and a full exhaust. I don't think boost timing will be a problem because you can order a MSD boost timing controller, but the difficult part will probably be tuning your fuel pressure and getting the maps right on a new chip. Dyno tuning would almost be a must I would think.

Later,
Harry

 

I'd only get stuff that work on a 350 (exp. cam). A weiand 142 blower would be cool. I asume you'd need a\ bigger injectors. You could use a mallory 4309 presser reg to incress fuel psi like an fmu but is cheeper then an fmu for added fuel enrichment

 

Procharger units are the easiest centrifugal superchargers to install as compared to vortech units.Prochargers are self contained units that dont need a pressurized line conected to the oil plan. When I finished opening up top end induction,I will look into getting a procharger D-1SC with a 2 core single intercooler.
Procharger also makes an air to water cooler but Iam not sure if any one has tried this. Have any of you heard about this system?