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Location:
Melbourne
Registered:
January 2003
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Location:
Brisbane
Registered:
May 2002
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Re: Fitting SC14 Supercharger - need some help
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Fri, 03 January 2003 00:33
 
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I can't help with 1 and 2...
3. This is a very bad idea. The SC14 is a positive displacement supercharger, which means it flows a fixed volume of air (1.4 litres in this case) per revolution. Now imagine what happens when the blower is spinning at 5000rpm and you back off the throttle - that's a pretty huge volume of air with nowhere to go! You'd end up with an enormous pressure spike which would blow the inlet piping to bits, and a BOV couldn't possibly flow enough air to prevent this from happening. This is why the blower is always downstream of the throttle plate when using a PD supercharger.
4. The 1G-GZE was fitted to various JDM vehicles; it was never available outside Japan, so your chances of finding a workshop manual in English are pretty much nil. However, the SC14 is very similar to the SC12 which was sold in the US, so have a look on EBay for an AW11 MR2 workshop manual. I don't know how much info they have on the supercharger itself, but I'm sure someone else will be able to tell you more.
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Location:
Vic
Registered:
May 2002
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Re: Fitting SC14 Supercharger - need some help
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Fri, 03 January 2003 01:21
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1. I never ran a valve or anything i just vented them to a small filter.
2. I adapted 4A pulleys to my motor
3. You must run some sort of bypass valve for when the throttle is shut. You can buy S/C bypass valves or just use a Blow off valve or 2 like i & many other people have.
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Location:
Melbourne
Registered:
January 2003
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Re: Fitting SC14 Supercharger - need some help
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Fri, 03 January 2003 22:15
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Thanks for the tips. I'm checking into the Castlemaine Rod Shop fitting of a similar supercharger to the Holden V6 engines - and hope to learn more and whether they blow through or suck through the throttle. I figure if I can set up the SC clutch to disengage when the throttle is closed (using the throttle microswitch) that may work, or, as discussed in a following post, use a bypass valve. If all else fails, I'll go the suck-through route. It's just a big pain to re-locate the throttle (longer cables, mounting brackets, fiddling around with cruise control, etc.....)
As for the manuals, I have figured out what year the SC engine came in MR2's in the states (looks like 1988 it was available - any other info on years as I am unfamiliar with the "AW11" code, not being a Toyota freak....the engine designations are like heiroglyphics as well to me!), so I can search for a manual online or have my folks check the Toyota dealer for me.
Greg
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Location:
Melbourne
Registered:
January 2003
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Re: Fitting SC14 Supercharger - need some help
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Fri, 03 January 2003 22:22
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BMAK - just curious about your fitting of the small filter to the gear case/bearing vent tubes.....On my SC, I can actually blow through the main hose connected to the 3 vent lines. This seems odd to me, as it would indicate there is an air path somewhere from the vent lines to the inside of the supercharger where the rotors are. If this is the case, wouldn't it be a problem venting this to the atmoshpere (even if via a filter?) I would think that this would basically bleed off some boost when the SC is huffing. Then again, maybe the SC I bought is knackered and there shouldn't be an air path from the vent tube into the SC body.....hmmmm, anyone know?
Thinking about it, shouldn't the shafts be sealed to the main housing, preventing any boosted air from entering either the bearing area or the gear casing??? I hope I didn't buy a dud SC.....
Greg
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Location:
Vic
Registered:
May 2002
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Re: Fitting SC14 Supercharger - need some help
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Sat, 04 January 2003 12:15
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The rod shop use a blow through setup on the holden V6's with a single Bosch Blow off valve for pressure relief.
1 BOV works ok but i think 2 are best.
I'm not positive but i think these vents relieve excess pressure from the bearings & gear housing.
With my supercharger a fair amount of air was released from these vents when throttle was closed @ high revs(15psi) & i assume this was normal as it was in perfect condition & i never had any problems.
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Location:
Melbourne
Registered:
January 2003
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Re: Fitting SC14 Supercharger - need some help
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Sat, 04 January 2003 22:28
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Thanks re: what the Rod Shop do. I have been perusing web sites looking at bypass valves. The Bosch valve looks pretty simple and I should be able to get a couple at one of the local European car wreckers, if not new ones. Due to their simplicity, the should be a lot cheaper than the "race-style" billet aluminium ones.
Good to hear that your vent hoses also breathe a bit. I was worried about the seals in my SC.
I did look into the SC the other day and noticed some wear/scraping on the pulley end of the housing (inside), where it looks like the end of the rotors contacted the housing. Is this normal? I'm assuming that there is some end play in the rotors, allowing them to just kiss the ends of the housing if conditions are right, but if this sounds like bad news, please let me know!
I have yet to check the oil in the gear case. I hope it's nice and clean. When I bought the SC, it had a lot of dirty engine oil in it. THe guy said he squirted some oil in there just to make sure it didn't run dry.....I'm a bit dubious!
I'll need new gaskets for the inlet and outlet ports - are they available new in OZ or sould I make my own??
Thanks folks!
Greg
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Location:
Vic
Registered:
May 2002
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Re: Fitting SC14 Supercharger - need some help
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Sat, 04 January 2003 23:50
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The bosch valve is available new from most auto stores & the part no. is 0-280-142-103. It should cost around $60
You wouls epect a little scraping on the rotors & housings.
Drain the oil & put new oil in, normal gearbox oil is fine.
silicon works fine instead of a gasket
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Registered:
September 2002
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Re: Fitting SC14 Supercharger - need some help
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Fri, 28 March 2003 04:51
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Is this bosch part a blow off or bypass or are they one and the same, need to setup something similar for my carbed 4y-c hilux, bypass valve would be good as even without the sc engaged i seem to be boosting a bit due to clutch friction, and it makes my engine race uncontrolably once i hit 2800rpm +
thanks
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Location:
Vic
Registered:
May 2002
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Re: Fitting SC14 Supercharger - need some help
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Sat, 29 March 2003 06:48
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Its a blow off valve but they work on the same principle.
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