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| svo_matt |
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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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| xr6_corbin |
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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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| The Judge |
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Age: 46 Posts: 141 Joined: 6th Jul 2008 Ride: FORD FE LTD TURBO/ XE TURBO Location: LIVERPOOL |
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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| shav |
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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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| cozza88 |
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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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| DA22LE |
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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  Daz
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