So, what are the pro/cons regarding each different type of Supercharger? A new kit just came out for the VX's to use a BD-11a centrifugal supercharger, and the Eaton-style Alpine supercharger has been on the market for years now.

The cost for the new centri-sc is a bit less than the Alpine, and is a very simple installation. The Alpine has a more OEM install look to it, but is very involved and is recommended that a shop do it.

If I'm gonna blow $2500 on a supercharger, I want to make sure I'm getting the most bang for the buck.

6/19/2006 9:03:30 AM

eaton is less efficient and makes constant boost

centrifugal blowers spool similar to turbos and are more efficient.

3lbs at 3000rpm 8lbs@5000rpm etc.


65-70% vs 85% ish efficiency wise

a twin screw like kenne bell makes is the best of both worlds

6/19/2006 10:09:24 AM

so if I want more umph lower end, I'd go with the Eaton?

6/19/2006 10:15:25 AM

Yep

6/19/2006 12:08:51 PM

I'm not really suffering at the low-end to be honest.

Its really up past 5000rpm that I start to lose it.

6/19/2006 12:10:49 PM

Centrifugal is your friend then.

6/19/2006 12:39:44 PM

I would start with higher duration cam(s), and a more open intake manifold if you're lacking top end. you're going to lose a bit of bottom end but the top end gains should be worth it. from there, a twin screw supercharger (eaton) would give you a unilateral gain in torque and HP. a centrifugal is basically a belt driven turbo, so it's going to be optimized to an engine type/size and rpm range.

6/19/2006 12:42:26 PM

I definitely need to open the intake up a bit. Its like trying to suck air through a collapsed straw.

A cone filter setup is all part of the centrifugal kit, but not part of the eaton kit.

6/19/2006 1:00:28 PM

I mean a whole manifold (or 2) man. Shorter port matched runners, larger plenum, larger openning, possibly for a larger TB

6/19/2006 2:14:46 PM

Eaton is positive displacement meaning... its moving X amount of air per turn no matter what... the pressure will just be higher if your shit is restrictive.

if its for the Isuzu I'd rock an Eaton any day.

eaton will make a difference in passing on the interstate... a centrifugal you'll have to down shift a time or two before it makes boost.

if you compare a centrifugal supercharger to a properly size turbo on any motor. it will just barely beat the turbo in hp for about 500 rpm before the turbo spools... then it gets pwnt till near red line when it gets close again (both set to run the same max pressure)

6/19/2006 5:01:03 PM

i believe eaton is more durable as long as you dont overspin them too much, but harder to intercool (technically its aftercooled) becase of their orientation

either way, i have an eaton on the bonneville and know a bit about them if you want to discuss them.

6/19/2006 5:42:50 PM

isn't almost everything after cooled except a turbo because the cooling device is between the compressor and the turbine ?

6/20/2006 7:24:13 AM

well with an eaton, the way an intercooler mounts is sandwich style between the SC body and the lower plenum. but yeah i see your point

6/20/2006 7:45:03 AM

Quote :

"isn't almost everything after cooled except a turbo because the cooling device is between the compressor and the turbine ?"

SAY WHAT

6/20/2006 9:11:25 AM

would it help you guys help me decide on which one if I posted a dyno chart of a stock engine?

6/20/2006 10:30:37 AM

perhaps, the more info the better

6/20/2006 12:35:50 PM

what is it going on? i'm still confused on that.


Sparky...

i'm not sure if i'm right on this but i think an intercooler
is and intercooler because its in the airflow before the compressor and after the turbine so its in the middle of the cycle

where with a supercharger there is no cycle so they should all be aftercoolers

but i could be completely wrong... its just how i make sense of it.

6/20/2006 12:43:56 PM

Isuzu 3.5L 6VE1

6/20/2006 12:52:15 PM

Quote :

"i'm not sure if i'm right on this but i think an intercooler is and intercooler because its in the airflow before the compressor and after the turbine so its in the middle of the cycle"

uhm.. after the compressor and before the turbine you mean?

6/20/2006 12:53:25 PM

yeah sorry...

not feelin so well today

Maugan... i'd go roots on a truck its a much better setup.

6/20/2006 12:54:31 PM

Here's some info for you fuckers. I remember from way back when damn near all diesel truck and marine engines were referred to as being aftercooled...once again, wiki has it.

http://en.wikipedia.org/wiki/Intercooler

6/20/2006 12:59:59 PM

roots = eaton style?

sorry, if you can't tell, I'm new to this.

Also, as far as being a "truck". This wont be used for regular "truck" activities except offroading (and to be honest, I don't need anymore power there, ask Joel). This is really just to make up some gains on the street when I put the bigger rubber on. Some guy made a VX run in the low 11s but he did all kinds of shit to the valve timing, bored out cylinders, custom TOD programming and shit. I don't want to go that far, but I really feel the need for more.

Then theres the LS1 conversion guy

6/20/2006 1:42:46 PM

eaton = more power under the curve.

centrifugal = more peak power.

6/20/2006 1:52:57 PM

do you have dyno graphs for both setups?

6/20/2006 2:41:19 PM

Quote :

"roots = eaton style?"

Rather, Eaton is similar to a Roots style supercharger in that both are positive-displacement, twin counter-rotating rotor types.

However, the Eaton is a twin-screw type, with the rotors having helical vanes, and some charge compression does actually occur.

The Roots has straight lobes, and functions as a positive displacement pump only, with pressure totally dependent on flow restriction.

6/20/2006 2:50:45 PM

actually i don't think eatons were....
they may be know
i'm pretty sure the mustangs (03-04)
are roots.

6/20/2006 2:53:03 PM

My bad...it is a Roots.

But a modified Roots...the rotors are twisted. According to Eaton, this is done to reduce intake pulsation

[Edited on June 20, 2006 at 2:58 PM. Reason : uhh]

6/20/2006 2:55:12 PM

yeah auto rotor and lycoming both make screw blowers

6/20/2006 3:27:42 PM