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Blow off valves 

 

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 Post subject: Blow off valves
Posted: Wed Nov 16, 2011 1:03 pm 
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Hey guys just wondering if blow off valves wear out.I've still got the original plastic one that came with my blower from Cappa had it for around 4 years.
Ok so when my car is cool it's got all the hp it's ment to but after around 30mins plus it just seems to be lacking,it's also down on boost by about 5 or so psi.
Any help would be good

 

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 Post subject: Re: Blow off valves
Posted: Wed Nov 16, 2011 2:03 pm 
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It's possible. Bov's have springs inside them. Heat can fatigue them. Good way to test it is get it warm and get it to fault then remove blow off valve and put a blanking plug where the hole is the. Take it for a drive and if it's fixed then youve found your problem.

 

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 Post subject: Re: Blow off valves
Posted: Wed Nov 16, 2011 11:16 pm 
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xr6_corbin wrote:
It's possible. Bov's have springs inside them. Heat can fatigue them. Good way to test it is get it warm and get it to fault then remove blow off valve and put a blanking plug where the hole is the. Take it for a drive and if it's fixed then youve found your problem.


Yep, this is a way to test it but if it is not the blow off valve which I highly doubt, I reckon you could have some blow by and as your oil heats up and loses it's viscosity/sealing ability you're also losing a little compression/boost

 

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 Post subject: Re: Blow off valves
Posted: Fri Nov 18, 2011 11:57 am 
Getting Side Ways
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Doesn't plastic expand with heat? I heard that the Bosch bypass valves (assuming you have that one) are ok for a time and cheap to buy, but you are better off replacing it over time to make sure you still have a good seal under boost.

My setup is different to turbo, but I swapped the Bosch bypass valve for a dual port Turbosmart unit and found its worked well under high heat and stressful conditions.

 

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 Post subject: Re: Blow off valves
Posted: Mon Nov 21, 2011 7:18 pm 
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my brother inlaws xr6t was loseing boost when it got hot het replaced the factory plastic bov to a 50/50 hks and it went like a bat outta hell again.
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 Post subject: Re: Blow off valves
Posted: Mon Nov 21, 2011 9:04 pm 
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I hate plastic with a passion, as anyone who knows me will agree. Get an ally BOV. At least if it doesnt turn out to be the problem, you wont have to worry about it again......

http://www.ebay.com.au/itm/Blow-off-valve-bov-turbocharger-adjustable-S13-Nissan-plumb-back-blow-off-valve-/190602851866?pt=AU_Car_Parts_Accessories&hash=item2c60d0b61a

http://www.ebay.com.au/itm/PCP-Plumb-Back-Supersonic-Silver-Blow-Off-Valve-BOV-/150432096336?pt=AU_Car_Parts_Accessories&hash=item230673a050

Both virtually identical to mine.......no probs, even after i modified it....lol.....

Cheers

8-) Daz 8-)

 

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