Spenser309

I'm looking at possible combo's for a 67' Camaro. I like the looks of a twin screw and roots type blower but what are the tradeoffs im facing? The objective is about 800rwhp on good gas and a pulley change with 600 or so on the street on 93 octane. Hood Clearence is a non-issue. What are the root and twin screw style blowers that are availiable for the LS1?

408 at 8.5:1 Compression, Max psi of 24, low boost of 12 for street.

H8 LUZN

The main problem on an Fbody with a positive displacement supercharger is FITMENT.

And if you truly want a positve displacement... wait a year or possibly longer till they hit aftermarket.. you'll like the new offerings... lets put it that way.

And yes, you will be able to hit 800+hp Although the stuff on the market now i dont believe will achieve that easliy... (positive displacement that is)

Spenser309

This is a 1967 Camaro, there is no cowl area.

ABeasst

iTrader: (5)

kenny bell Ls1 blower

Dragframe

iTrader: (14)

x2....

H8 LUZN

Sorry i cant read very well it seems.. i looked at your sig pic.

Anyhow, i would suggest waiting if you want max efficiency. Screw compressors start to reach the point of diminishing returns at above 550 or so hp.

The current roots will not be able to reach your boost pressure either... another good reason

If you want to reach that level and cannot wait... i suggest a centrifigal type or turbo for max efficency.

For example the S2300 (ford GT) is close to the performance numberst to the S3300 even though its 1000cc/rev larger but has to spin slower due to the large size. Therefore anything over 600-650hp would be pushing it for the screw type and put them out of their efficiency range. (not saying it cant be done.. just saying its not optimal)

DeltaT

iTrader: (5)

Get Corky Bell's book "Supercharged!". It talks about centrifugal, twin-screw and roots blowers in detail. You will learn the pluses and minuses of each, and they all have advantages/disadvantages. This book helped me build my blown 383 and get what I wanted out of it. Will pay for itself, at $20.

Jim

H8 LUZN

Yes, i suggest anyone who is looking into buying a supercharger learn and read as much about the different options. There are trade offs with each.

300bhp/ton

Root's style IMO stand no chance of 800rwhp, even 600rwhp might be pushing it.

A twin screw can do this, but you'll need to get a blower big enough, I think the Vette kit from Kennebell (www.kennebell.net) uses a 2.4 twin screw, this will make it into the ball park area you are talking about but it will be pushing quite hard. But PEAK numbers arn't always everything, if you want low end grunt and instance response then a PD blower maybe the way to go.

A Centrifugal has the ability to do this, but it's all revs by comparison to a PD blower, so it may be better at the track but perhaphs slightly different on the street.

Or as others have mentioned a turbo setup.

bboyferal

iTrader: (9)

It's the size of these style blowers that is limiting them... They could, theoretically, just make them bigger... not that they'd fit in a normal car, though. Thus, the appeal of centrifugal superchargers for 600+ whp street, or at least street-ish, cars.

300bhp/ton

Yeah Whipple sell a 3.3 twin screw for the LS1. This should be a sensible option if hood clearance isn't an issue (oh and money).



http://www.whipplesuperchargers.com/...sp?ProdID=1230

bboyferal

iTrader: (9)

Wow... My F-body would run away from that with no driver in the car!

That a sweet blower, too bad it only fits LS1's in NON-LS1 cars...

H8 LUZN

or does it...

300bhp/ton

yep. I really do love the twin screw blower as a concept, so much so that I nearly bought a Stang so I could run one. But better sense told me get the LS1 mod it and save for a Procharger.

bboyferal

iTrader: (9)

I'm sure you'll figure out a route for that Camaro... Maybe you should go turbo?

bboyferal

iTrader: (9)

nitrous = ?

or

a real

with standardly available street roots/twin screw, ala Kenne Bells?

Hennytime

iTrader: (33)

ive been thinking about this for a while. with a 224/228 cam and 5-7spi of boost, a roots or twin screw blower will have retarded amounts of power down low. it should also peak around 475rwhp, add a nice 150 shot and theres your 600rwhp...

i've already got the nitrous systems lol

bboyferal

iTrader: (9)

Yeah, it's possible and done by many KB Mustang guys in the 700+ numbers. It's just really tricky tuning with FI and nitrous... should be tuned by a top expert if you ask me.

H8 LUZN

I'll leave it at that.

Spenser309

What about that big BDS blower that had pictures on here from some show? It was posted by an admin.