JoNalzy

What should I get for my 85 305 V8 5.0 L chevy Camaro? A supercharger or a turbocharger (a turbocharger would have to be custom)? Right now I think a supercharger would be better, but I want to see what other people think. Also, if I get a supercharger, what type of supercharger will fit my Camaro? Is it any GM made supercharger? Also, if you know of any sites or places that sell superchargers that will fit my camaro please let me kno.

89JYturbo

IMO a turbo is the only way to go. But a supercharger is usually easier for installation.

Check out BBSD turbo systems. He sells some kits on eBay, and was posting here a while back. If you do a search here, you should find a lot of info on his kits.

leeperryracing

That plumbing work for the turbo is a b*tch...the supercharger is much easier to install but don't forget though, turbochargers are the most efficient power adders so if ease of installation is not your concern, go for it!

SnkSknrZ28

iTrader: (2)

Here is your answer: http://www.bankspower.com/Tech_twinturbo.cfm

Keep a pair of clean pants nearby

JoNalzy

Honestly, I don't kno much bout twin turbo .. I kno I want it. I have friends who are mechanics and can help me and teach me, but I'm not even sure if my 305 V8 can handle twin turbo. Do you think I should get an LT1 or an LS1 and then put twin turbo on that? How much does twin turbo run at?

DemonKnightDK

Any engine can be built to handle a turbo. If your engine is stock, you want to look into rebuilding it from the ground up with boost in mind. (stock i think it could probably handle maybe 5-7lbs of boost)

I'm not a turbo or SC guru (I did do a good amount of reading up on the L67 Grand Prix GTP though before I decided to get a firebird) so I know that you want to use forged internals and an intercooler would help some as well. Probably want a lower compression ratio also.

I tend to lean toward SuperChargers my self, a twin screw SC can be just as efficent as a turbo and you'll have boost right when your foot hits the gas

vejatabul

with a turbo you will loose about 7% of the power you make. a twin screw is about 15-20%. so i guess a twin screw is about twice as IN-efficent. not really AS efficent i would think. im going to do the math real quick and post back how much power a top fuel dragster would make if it was turbo instead of sc..........

DemonKnightDK

I was going by abeadic (spelling?) efficentcys. but from what I've seen on street applications a twin screw will make preaty much the same power as a turbo but still have the TQ of a roots blower. Which is why I prefer a SC. but yes, for all out power you cant really beat a turbo (but I dont like turbo lag, and wouldent like the sudden power kick in after the car was already moving that it gives)

But that brings up the question, why ARENT top fule draggsters using turbos?

83 Crossfire TA

iTrader: (2)

Simple… they’re illegal.

Both screw types (like the lysholm) and roots type (like the Eaton) blowers have gotten much more efficient in recent years, but on to the extent that you think. Their adiabatic efficiency still isn’t on par with a modern turbo, but their VE (a number that is irrelevant to a turbo anyway, so there is no comparison) has gotten much higher in recent years.

DemonKnightDK

I must have been confusing the two efficentcies. my bad.

I dont understand why the outlaw turbos on the top fule dragsters though.. if they are better, why not use them?

(either way, I still like super chargers, I wouldent turn down a turbo system if it was given to me, but I'd rather have a SC.. I'm just wierd. I'd also take a buick 430 over a chevy 427..)

LB9_IROCZ28

Turbos can produce max/full boost much lower in the rpm range. SC's inherently are setup (by pulley sizes) to produce max boost much later in the rpm range-- if they produced max boost early (like a turbo), then when they reached redline, overboost or overspinning the compressor could result.

Am I correct on this?

KS91Z28

No. Not totally.

Roots style blowers tend to have aal their boost in the lower RPM range, and centrifugal blowers tend to act more like a belt driven turbo.

LB9_IROCZ28

Cool, thanks for the information. My friend is a Procharger dealer and he is harrassing me to go S/C instead of turbo. His are all centrifigul style (as far as I know), so I guess my comments specifically apply to my situation. Ya couldn't possibly run a roots on a stock TPI, so I guess I hadn't thought about it. However, I am curious as to how the roots would be quicker to boost "down low" and wouldn't have the issues of overspinning or spiking when the R's are high. Would that mean that roots are more efficient early on in the rpm range? Is there some sort of relief on a roots setup that prohibits overboosting, or a device that allows it to boost more/earlier? Or is this an inherent trait in the design? Just curious.

JoBy

Roots is a fixed displacement blower. For every revolution it moves a fixed volume of air from one side to the other if you discard internal leaks. A 4-stroke piston engine is also a displacement pump on 2 strokes and a combustion engine on the other 2 strokes. By connecting the with a belt they both pump about twice as much air if you double the rpm. The boost almost constant over the rpm range. You select boost by changing the pulley ratio.

A centrifugal supercharger is an open design. The air flow can be very different at the same rpm. There is no boost at low rpm and max boost at max rpm. You select max boost at max rpm by changing pulley ratio.

A turbo IS a centrifugal supercharger that is connected to an exhaust turbine wheel instead of a pulley. You use a wastegate to limit boost. You can get max boost a low rpm if you load the engine and then the wastegate open to keep the boost from rising.

KS91Z28

Well said!

3rd gen V8

this is probably a dumb question but what do you guys think souds better when you hammer it? the sc or the twin turbos spooling up ? i think i would go for the twin turbo sound.

kukri

it sounds best when u got both s/c at the low end and t/c at the high end

PhantomFE3

i like the sound of superchargers when you hammer it but they kinda sound like electric remote controlled cars. a turbo sounds sweet spooling up, thats a tough decision though, id hate to have to choose between the whistle of a turbo and the whine of an SC

83 Crossfire TA

iTrader: (2)

A properly sized and built turbo setup will pretty much spool anyplace you want it to, right off idle or WOT.

A positive displacement blower is much the same, if not more so, you have boost as soon as you go WOT, rpm doesn’t matter.

A centrifugal blower is the only one that is really limited to a rather narrow range where it makes real boost…

f355bird

iTrader: (2)

I agree to a point my daily driver has a roots blower and im within 2 psi of boost from 1,500 tgo 6,000. My car makes 10psi at 1,500 and it makes 12psi at 6,000. Roots are noted for their broad torque band they make power all the time and all across the board. There really is no hi or low spot. Centrifugal and turbos have spikes. They raise up to there peak. Man i love my roots blower instant power. Everyone has to run me down. My car is in the 300 horse range and i can run from 400+ horse cars. Most have to get there rpms up or wait on their turbo to spool. My car doesnt bull**** im making peak power instantly.

porkyzilla

iTrader: (1)

i would have to say turbo there is a reason turbo's are banned in drags...they are so much more effecient

turbo's are also alot easier on the engine a super charger power is usally right there thats how your rear end brekas a turbo is gradual increase...and alot more effiect more work

but if you want ease of installlation go with pro charger

TwnTrboZ28

BDR

do something different..everybody and their grandmother has a S/C on their third gen. kinda boring if you ask me. i'm doing a tt 406..have almost all parts except the tubing..waiting on machine work and turbos to come in.

be different... and turbo's sound better then a sc.