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  #1  
Old 02-02-2007, 08:28 PM
Diablo Diablo is offline
 
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Default 1g blow off valve on my Buick

I have a 1987 grand national with injectors, downpipe and some other mods. I have a 1g eagle talon blow off valve welded to my up pipe that does not want to blow off when it should. Where does the line coming from the blow off valve go? and what would be some reasons it wouldn't be working.
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Old 02-05-2007, 10:40 PM
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Default Re: 1g blow off valve on my Buick

to a good vaccum source
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Old 02-05-2007, 10:40 PM
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Lightbulb Re: 1g blow off valve on my Buick

Quote:
Originally Posted by Diablo
Where does the line coming from the blow off valve go?
Well...not sure about the workings of that valve. There are several different pressure measurements under boost that change when the throttle is closed.

- Manifold, behind the throttle plate
- Turbo outlet (essentially, where it is mounted)
- Turbo inlet

The blow off valve measures differences in pressure and releases boost build up. So I'd want to measure an area that would lack pressure on closed throttle and an area that would still have high pressure immediately after closed throttle. Does this valve have two inputs, or rely on where it is mounted for the second one?

BTW, I don't feel blow off valves are necessary or of any value on these cars. Read the past messages on this area and see people's bad experiences with them. These aren't manual transmission cars, so they aren't needed for boost reduction during shifts. And if you want it for the cool noise, you bought the wrong car entirely; you need a Honda with a 5" muffler tip.
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Old 02-05-2007, 10:44 PM
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Default Re: 1g blow off valve on my Buick

i also have to agree with Scott on this.. i ran several BOV's and found that they just caused me more problems then they helped..
Do a search on BOV here and you see what we are talking about
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Old 02-06-2007, 12:52 AM
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Default Re: 1g blow off valve on my Buick

i use the factory bov for the puck on the exhaust housing and i have a 2001 subaru wrx bov in the up pipe and run the air back into the intake after the maf like the wrx so there is no turbo lag. found the bov for 10.00 on ebay a few years ago or if you have a vin of a wrx you can go to subaru and buy one, i dont know the dealer price as i dont have a vin od a wrx.
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Old 02-06-2007, 01:46 AM
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Exclamation Re: 1g blow off valve on my Buick

Quote:
Originally Posted by mybuick
i use the factory bov for the puck on the exhaust housing
There isn't any factory blow off valve.

Perhaps Buick knew best...
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Old 02-06-2007, 01:53 AM
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Default Re: 1g blow off valve on my Buick

for what its worth here is a pic of one of the BOV's i used to run.
the greddy Type R


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Old 02-06-2007, 01:56 AM
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Default Re: 1g blow off valve on my Buick

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Old 02-22-2007, 01:46 AM
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Default Re: 1g blow off valve on my Buick

your car is probably making to much boost for the BOV too handle, a stock ecplise BOV isn't going to hold up to the higher pressures of the GN. I haven't found a stock bov that would hold over 12psi, my old Denso failed at a mere 10psi, anything over that would cause it to surge.

I do recomend the HKS SSQV, that thing does not leak at all! plus its adjustable from like 8 - 35 psi

.02 hope it helps
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Old 02-22-2007, 01:51 AM
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Default Re: 1g blow off valve on my Buick

nice info..

also noted.. the more boost you build with the HKS SSQV the tighter it seals..
Nice design and recomended if you gonna run a blow off valve.
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