2.0L LSJ Performance Tech 205hp Supercharged SS tuner version. 200 lb-ft of torque.

Blow off valve

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Old Jan 21, 2008 | 11:11 AM
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yellowspeed5's Avatar
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Blow off valve

I have a stock 2005 ss/sc, and wanted to start working on the engine. I was looking to get a blow off valve for the supercharger. What exactly does it do?
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Old Jan 21, 2008 | 11:12 AM
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Put on Flame Suit.
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Old Jan 21, 2008 | 11:13 AM
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Where were you looking to find the blow of valve?
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Old Jan 21, 2008 | 11:14 AM
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oh good grief...

you can't have a blow off valve on the SS/SC... it's impossible... it will not mount up in any way, shape, or form.

the eaton has a built in bypass valve that handles the boost.

if you want the "psssh" sound... go get a turbo car.
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Old Jan 21, 2008 | 11:15 AM
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Originally Posted by killianss
Where were you looking to find the blow of valve?
Because most people new to the car hobbie think they can be used in both turbo and supercharger applications. This is partially true, but not with a roots style supercharger like the SS/SC has. Now if the SS/SC came with a centrifgul blower that would be another story. I hope this helped you out.
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Old Jan 21, 2008 | 11:21 AM
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k thanks
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Old Jan 21, 2008 | 12:12 PM
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^common mistake...hell i asked the same question a long while ago... but thats wat this site is for, right?...information & sharing
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Old Jan 21, 2008 | 12:19 PM
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Originally Posted by RaineMan
oh good grief...

you can't have a blow off valve on the SS/SC... it's impossible... it will not mount up in any way, shape, or form.

the eaton has a built in bypass valve that handles the boost.

if you want the "psssh" sound... go get a turbo car.

Its not impossible but it is worthless in doing on a stock s/c
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Old Jan 21, 2008 | 10:15 PM
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actualy a bov wouldnt do anything. what its designed to do is when the throttle slams shut it will open releaving pressure in the charge pipes. now this is true when the throttle body is after the supercharger/turbo. when the throttle body is placed before the supercharger/turbo you dont have a pressure built up when you let off the throttle, the engine simply used the boost very rapidly and it goes back into vacume. this is also how a diesel works, as they have no throttle body (the throttle on a diesel is by controlling how much fuel is being injected)
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Old Jan 21, 2008 | 10:16 PM
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Originally Posted by Herndon_High_SS
Put on Flame Suit.
hahahahah

oh god
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Old Jan 21, 2008 | 10:19 PM
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on rlf theres a psuedo how to....you need to T one of the hoses going to the boost bypass unit and plumb it to a very low boost BOV and it will work
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Old Jan 21, 2008 | 10:20 PM
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If you build boost AFTER the throttle body, you don't need any kind of diverter or BOV.
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Old Jan 23, 2008 | 12:27 PM
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dont listen to these guys. you can put a blow off valve on a supercharger. But before you put the blow off valve on you better check your blinker fluid, otherwise the blow off valve won't get proper lubrication.
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Old Jan 23, 2008 | 12:28 PM
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Originally Posted by RaineMan
oh good grief...

you can't have a blow off valve on the SS/SC... it's impossible... it will not mount up in any way, shape, or form.

the eaton has a built in bypass valve that handles the boost.

if you want the "psssh" sound... go get a turbo car.
Actually, it HAS been done on this car.

No it is NOT worth it.
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Old Jan 23, 2008 | 12:44 PM
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Originally Posted by SSdan
Actually, it HAS been done on this car.

No it is NOT worth it.
problem is, i like both turbo sound and supercharger whine... argh lol
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Old Jan 23, 2008 | 12:46 PM
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Originally Posted by Cobalt_SSTuner
dont listen to these guys. you can put a blow off valve on a supercharger. But before you put the blow off valve on you better check your blinker fluid, otherwise the blow off valve won't get proper lubrication.
hahaha good one tuna!!


and it is possible but so very pointless, our car at stock bumps boost at whatever it is 12psi or something?!?! anyways, that stupid blow off would continue to go off until u shifted out of boost, in a long gear that could be like 3 seconds...
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Old Jan 23, 2008 | 12:48 PM
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Originally Posted by yellowspeed5
I have a stock 2005 ss/sc, and wanted to start working on the engine. I was looking to get a blow off valve for the supercharger. What exactly does it do?
you're just asking for trouble when you ask that question
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Old Jan 23, 2008 | 02:24 PM
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How is it even possible? You need a manifold source and the area in which to evacuate air from. In this instance its the same to sources? Fact of the matter is, you can't use a BOV if boost is built past the throttle body. Omni GLH's are a great example. They were turbo from factory and the throttle body was positioned before the turbo making a BOV pointless. You couldn't even hook one up and get it to function properly.......
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Old Jan 23, 2008 | 07:50 PM
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freaking awesome
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Old Jan 23, 2008 | 07:56 PM
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you want noise get an intake
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Old Jan 23, 2008 | 08:04 PM
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its very possible to put a bov on our cobalt sc. i thought deeply about it and its possible with certain customization. only thing is you'll loose boost because it will have to connect to the same wastegate as the bpv in the sc so the bov will be stealing air fromt he wastegate. just like if you put a bigger intercooler on a turbo'd car with a stock wastegate. the intercooler will draw the air from the wastegate making the turbo lose boost. never say never. theres always a way to make something work. if you would like to know how customize it just let me kno.
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Old Jan 23, 2008 | 08:09 PM
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get a procharger(belt driven turbo, a.k.a. centrifugal supercharger). then you can be cool like the scion guys and have a BOV on your s/c'd car.
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Old Jan 23, 2008 | 09:10 PM
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Need a T fitting, check valve, pretty good size reservior to build pressure and a cheap, loud blow-off that will work well with only a little puff of air. Like said above, pointless, but possible.
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Old Jan 23, 2008 | 10:22 PM
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If you want to waste money doing this please just paypal me the money instead. At least then the money will be spent on a LSJ to make it go faster.

search button > yellowspeed5

(next time you should consider using the search button and doing some research my friend) =)

Going for a better sound? Get exhaust, a manifold, and smaller pulley/tune.
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Old Jan 24, 2008 | 12:51 PM
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Ill sell you a blow off valve, give you a real good deal too. and if your interested i have a flux capacitor that will add about 30 hp as well. PM me.
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