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Registered:
September 2002
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supergharger problems
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Thu, 27 March 2003 18:58
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Hi,
Have finally finished installing the sc14 supercharger into my 4y-c hilux. It is an air cleaner --> supercharger ---> carb setup. Have hooked up temorary air cleaner and carby tubing, and went to drive it to a place for proper stuff. when it revs above about 2600rpm even without the sc engaged (clutch) the engine races to redline. what would be causing this, clutch spins freely by hand but turns sc a little with engine revs. I have the 3 vent lines in the sc vented to manifold. dont have much of an idea on charger setup, just did the bracketry. any other probs i might encounter?? just want to run charger in standard form.
thanks
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I supported Toymods
Location:
Northern Beaches
Registered:
May 2002
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Re: supergharger problems
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Thu, 27 March 2003 20:33
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if its while ur going along and on full throttle ummm could it be your acutual clutch slipping heaps? maybe its not fully engaging? and when u hit some power it just slipps causing the motor to freely rev?
just an idea
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Location:
c'town, NSW
Registered:
May 2002
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Re: supergharger problems
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Fri, 28 March 2003 00:16
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i cant help with your SC question but
what year model hilux is it?
is it 2WD?
did it come from factory with the 4Y-C?
just need some info, i want to replace a tired 3Y-C with a 4Y-C without having to engineer it.
thanks
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Registered:
September 2002
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Re: supergharger problems
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Sun, 30 March 2003 11:38
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model is yn67 four wheel drive, factory 4y-c (seem pretty rare) 2/88 model, you whouldnt have any probs upgrading to 4y-c, as far as i know everything bolts up same. I am going to go 4y-e when this one dies.
It seems as though the engine vacuum through the carb is causing the probs, makes the s.c spin itself without clutch engaged, does anyone know how i tell if the bypass valve in the sc is working?? have tried connecting and disconnecting vaccum hoses to vent holes no difference in air volume or anything. i think i need an external bypass valve anyone got any details on these?? need it to be robust, 4bee cops a flogging.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: supergharger problems
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Sun, 30 March 2003 11:44
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There is no bypass valve IN the blower - its a seperate thing on the toyota enines. The three hoses are just to keep equal pressure on the oil seals to prevent leaks. If you want to be able to switch the blower off, then you really should put a bypass valve in, or expect some fierce fuel consumption! Also, I'm not sure about the 4Y carb, but many carbs aren't designed at all for any kind of pressure feeding - is it maybe opening the secondary as it comes onto boost? If you're planning on changing later anyway, change to EFI now - probably cost less to get it working with the blower than the carb 
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Location:
Montrose, VIC
Registered:
May 2002
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Re: supergharger problems
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Sun, 30 March 2003 11:45
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As for a bypass valve, you could try the original one from a 4agze/1ggze, or maybe an R33 skyline blow off valve.
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Registered:
September 2002
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Re: supergharger problems
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Sun, 30 March 2003 12:06
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what sort of carb would work?? would a webber 32/36 work. I though that about the secondary too, it is vaccum operated so maybe this causes problems. I thought there was an internal bypass in the charger (from what i have read maybe didnt understand properly)
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Location:
Montrose, VIC
Registered:
May 2002
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Re: supergharger problems
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Sun, 30 March 2003 12:15
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Have a look at the blower - see how there's no place air COULD bypass?
As for what carb to use, I can't suggest anything too definate, one possibility is to put the blower after the carb and do it the easy way
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Registered:
September 2002
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Re: supergharger problems
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Sun, 30 March 2003 12:20
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have heard its not good to put this style sc after carb???
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Location:
Brisbane
Registered:
May 2002
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Re: supergharger problems
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Sun, 30 March 2003 12:51
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You heard correct; the SC series superchargers are positive displacement, which means you're going to run into problems as soon as the throttle plate starts to close. Of course you can set it up so the SC clutch only engages when at WOT, and I assume that's what cplux is trying to do.
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Registered:
September 2002
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