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Registered:
April 2003
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i need a supercharger
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Sat, 14 August 2004 03:20
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i'm looking for a supercharger to put on to my 5Sfe,
off some other car like a cressida or corola or something like that, must be positive displacement, doenst matter about gears as i plan to gear it up anyway,
any ideas please
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Location:
Brisbane
Registered:
May 2002
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Re: i need a supercharger
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Sat, 14 August 2004 12:51
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An SC14 as found on 1G-GZE's is what you need. Positive displacement, designed for a 2 litre engine.
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Registered:
April 2003
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Re: i need a supercharger
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Sun, 15 August 2004 08:54
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is that off the old 2ltr soara?
would i be able to pick one of those up from a jap wreaker,
anyone now what sort of dollars they go for
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Location:
cambo
Registered:
May 2002
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Re: i need a supercharger
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Sun, 15 August 2004 09:57
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from a wrecker they go for approx $350, the smaller sc12 will go for about $300 from a wrecker.
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Location:
Melbourne
Registered:
August 2003
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Re: i need a supercharger
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Sun, 15 August 2004 11:53
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I've often seen SC12 more expensive than SC14, as perhaps they are rarer?
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Location:
South Australia
Registered:
July 2002
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Re: i need a supercharger
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Sun, 15 August 2004 12:01
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Sounds like polishing a turd to me 
Although, it's a strangely enticing idea.
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Registered:
April 2003
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Re: i need a supercharger
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Mon, 16 August 2004 09:14
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u have to do something to be different these days
a fully kitted wide body camry with a front mount and as much torque as a 5.7ltr V8, from 14psi is bound to get some antention
wouldnt you say,
14sec 1/4mile might not seem fast but it is for a big fat camry,
so you can pick them up from wreakers and places that bring over half cuts?
what car is it off? SC14
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Location:
Sydney
Registered:
October 2003
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Re: i need a supercharger
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Mon, 16 August 2004 10:31
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Its of a 1G-GZE
2L inline six
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Registered:
April 2003
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Re: i need a supercharger
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Tue, 17 August 2004 08:59
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do you know what sort of boost they produce on the factory pully set up.
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Registered:
April 2003
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Re: i need a supercharger
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Tue, 17 August 2004 09:05
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does anyone know how much boost u can get out of an sc14 before you start overdriving it?
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Location:
brisvegas
Registered:
August 2004
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Re: i need a supercharger
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Tue, 17 August 2004 11:31
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it's not always how much boost you can run, but the actuall volume of air it flows. the Sc14 as the name suggest put out 1.4 liters of air for every 1 revolution of the s/c, they can take a fair but of abuse i have heard, i don't see any reason why it shouldn't be able to run 14psi all day..everyday..hyundi (opps worng manufacturer  ) i dunno how they acutally relate to eachother, but i'm sure someone knows, i have just been learning about this from my sc12 on my 4agze, and turbo conversions etc..
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Registered:
April 2003
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Re: i need a supercharger
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Wed, 18 August 2004 09:06
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okay kewl
sounds good,
what sort of boost though do they produce on the car the came out on with the stock pully
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I supported Toymods
Location:
Adelaide
Registered:
July 2004
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Re: i need a supercharger
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Wed, 18 August 2004 09:36
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14 PSI is safe to run but not all the time, a mate of mine fucked an SC14 up by running 14 Pound all day everyday...
I wouldnt go higher than 12 if you wanna keep the blower healthy...
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Location:
cambo
Registered:
May 2002
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Re: i need a supercharger
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Wed, 18 August 2004 11:09
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i dont think its so much the pressure you run but the heat the s/c is subject to. my sc12 ran 15psi all day every day for years wiht no troubles at all, but maybe im just lucky.
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Location:
Adelaide
Registered:
January 2004
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Re: i need a supercharger
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Thu, 19 August 2004 02:44
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| EVOSTi wrote on Wed, 18 August 2004 20:39 |
i dont think its so much the pressure you run but the heat the s/c is subject to. my sc12 ran 15psi all day every day for years wiht no troubles at all, but maybe im just lucky.
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Yeah, my understanding is that the toyota superchargers have teflon rotor tips to stop them wearing out, but if you spin them too fast, then you can melt the tips. I could be wrong though...
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Location:
Melbourne
Registered:
June 2004
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Re: i need a supercharger
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Thu, 19 August 2004 04:50
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| Lachie wrote on Thu, 19 August 2004 12:44 |
| EVOSTi wrote on Wed, 18 August 2004 20:39 |
i dont think its so much the pressure you run but the heat the s/c is subject to. my sc12 ran 15psi all day every day for years wiht no troubles at all, but maybe im just lucky.
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Yeah, my understanding is that the toyota superchargers have teflon rotor tips to stop them wearing out, but if you spin them too fast, then you can melt the tips. I could be wrong though...
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Sounds spot on, if they are coated rotors. The new Mini Cooper-S is known to have rotor-tip problems when people overdrive their S/C and run flat-out for long periods. The factory approved "John Cooper Works" kit includes a changeover S/C with slightly different rotors, coated in a more heat-tolerant polymer. -Thus solving the problem while running more boost.
Why does it have to be a positive-displacement pump? Centrifugal S/C's reputedly throw-out WAY more top-end H.P.
Have you got something against top-end H.P, Rozz? 
 Just messin: Boost = good
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Location:
brisvegas
Registered:
August 2004
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Re: i need a supercharger
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Fri, 20 August 2004 05:11
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it varies from car to car, but they quote 8psi, but thats what the 4agze is suppose to do..and min is running 9.5psi, i just disabled the ABV (wich is a rather interesting gizmo! it's a wastegate, BOV, and it bypasses the air around the supercharger when it's not in use!) so it wouldn't bleed off above it's set 8psi.. i'm sure that on long uphill or top speed runs i have seen the boost get to above 10psi.. stock pulleys mind you, the 1G-GZE s/c (sc14) would be running about the same stock..
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Registered:
April 2003
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Re: i need a supercharger
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Fri, 20 August 2004 08:56
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how does a Centrifugal S/C work
i just wanted a posivtive displacement instead of a suck through type charger, as in a s/c before the inlet madifold instead of after
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Location:
Brisbane, QLD
Registered:
February 2003
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Re: i need a supercharger
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Fri, 20 August 2004 09:20
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its belt driven like a positive displacement one(or screw type s\c)
but its airflow increases in a square fashion as rpm increases, instead of linear like a normal positive displacement one
for example
at 3k rpm a centrifugal might be pumping 9 litres of air per revolution
at 6k it will be pumping 36 litres etc
where as "normal" sc's would be pumping say 6L at 3k rpm and 12L at 6k rpm
i think thats the basic theory...
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Location:
Brisbane
Registered:
May 2002
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Re: i need a supercharger
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Fri, 20 August 2004 14:52
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| rozz wrote on Fri, 20 August 2004 18:56 |
i just wanted a posivtive displacement instead of a suck through type charger, as in a s/c before the inlet madifold instead of after
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You're getting your terminology confused here. Positive displacement simply means the blower displaces a fixed volume of air per revolution; it has nothing to do with the location of the blower.
As for having the blower after the inlet manifold, I fail to see how that's even possible? 
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Location:
cambo
Registered:
May 2002
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Re: i need a supercharger
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Sat, 21 August 2004 00:17
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i just assumed he meant throttle butterfly.
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Registered:
April 2003
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Re: i need a supercharger
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Sat, 21 August 2004 08:21
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yeah i dunno i lost myself aswell.
positive displacement works just fine for me anyway
double the rpm the boost double also? right?
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Location:
Brisbane
Registered:
May 2002
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Re: i need a supercharger
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Sat, 21 August 2004 08:50
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Assuming linear efficiency, yes. In the real world, no.
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Location:
Sydney
Registered:
July 2002
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Re: i need a supercharger
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Sun, 22 August 2004 07:23
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I have 2 X larger SC14 Super chargers here, $250 each.
Japanese Import Parts
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Location:
Melbourne
Registered:
June 2004
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Re: i need a supercharger
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Sun, 22 August 2004 08:10
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| rozz wrote on Fri, 20 August 2004 18:56 |
how does a Centrifugal S/C work
i just wanted a posivtive displacement instead of a suck through type charger, as in a s/c before the inlet madifold instead of after
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You mean before the throttle butterfly, yeah?
Yeah - the majority of screw/roots positive displacement S/C's are designed to bolt in between the throttle butterfly and the intake manifold. Don't know if I've seen a centrifugal S/C mounted behind the throttle butterfly. I assume the pumping losses at highway-cruise would hurt fuel economy too much. I don't think one type would be significantly easier to install/setup than the other.
Like Norbie said, a positive displacement S/C will pump a fixed volume of air for every revolution of the crank, regardless of revs. They tail off in efficiency as they get towards the top of their intended rpm range. This tends to give stump-pulling torque at low rpm, with linear performance until the engine and S/C lose efficiency past 4->5,000rpm.
A centrifugal S/C is sometimes called a "belt driven turbo" because it runs a similar compressor wheel + snail housing. No exhaust turbine driving the compressor. These have little effect below 2,000rpm, and build boost as the square of engine rpm, until the compressor maxes out its flow-rate. Similar response to a turbo engine, but without the lag, and without the "turbo rush" when turbo motors suddenly start making boost. Centrifugal S/C's ramp-up the boost much more smoothly though, more of a "swooosh" when coming onto boost, instead of a turbo "thump."
I think the easiest way to do install either type would be to go:
Air filter -> S/C -> B.O.V. -> AirFlowMeter -> ThrottleBody -> Intake manifold.
That way, you don't have to mess with the factory throttle body, and if you've got an air flow meter you don't have to worry about the BOV plumbing. Because supercharging gives the same psi of boost per-rpm every time, you should get away with minimal computer changes. A piggyback cpu should do it, unless your factory ecu is re-programmable. (in theory)
There's as many ways to force air into an engine as there are to skin a cat!! Hope this at least gives you something to think about!!
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