lee_kelsey Posted July 9, 2002 Share Posted July 9, 2002 Guys, I currently have a blitz induction kit on my beast, but have recently read a review which claims they are the worst for filtering dust and any other fine particles of crap! Was interested to hear any experiences recommendations you have had with these kits, as I am now looking at changing mine. Also, I have the standard j-spec BOV and am looking to upgrade this to, any recommendations here to, would be appreciated. Rgds Lee Quote Link to comment Share on other sites More sharing options...
GavinL Posted July 9, 2002 Share Posted July 9, 2002 Originally posted by lee_kelsey Also, I have the standard j-spec BOV and am looking to upgrade this to, any recommendations here to, would be appreciated. Rgds Lee Changing your BOV isn't really an upgrade. The stock item works perfectly well on stock or BPU cars. Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted July 9, 2002 Share Posted July 9, 2002 Originally posted by GavinL Changing your BOV isn't really an upgrade. The stock item works perfectly well on stock or BPU cars. It is an upgrade in terms of sound! *PSSSCCCHHHHEEWW* Quote Link to comment Share on other sites More sharing options...
GavinL Posted July 9, 2002 Share Posted July 9, 2002 Originally posted by Mark Ayling It is an upgrade in terms of sound! *PSSSCCCHHHHEEWW* can't stand them myself Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted July 9, 2002 Share Posted July 9, 2002 Originally posted by GavinL can't stand them myself ...each to their own! Isn't the HKS SQV the latest favourite? I think its adjustable as well. I'm sure someone who knows what they're talking about will pop in any minute....! Quote Link to comment Share on other sites More sharing options...
lee_kelsey Posted July 9, 2002 Author Share Posted July 9, 2002 Originally posted by GavinL Changing your BOV isn't really an upgrade. The stock item works perfectly well on stock or BPU cars. Gavin, I assumed that a larger BOV would provide a larger exit for excess gases, therefore expelling them more quickly, resulting in a 'slight' performance increase? I also don't have a stock car, I just havent got round to doing this bit yet. rgds Quote Link to comment Share on other sites More sharing options...
lee_kelsey Posted July 9, 2002 Author Share Posted July 9, 2002 Originally posted by Mark Ayling ...each to their own! Isn't the HKS SQV the latest favourite? I think its adjustable as well. I'm sure someone who knows what they're talking about will pop in any minute....! I've checked those out on Justins site (£245!), so I could get one sunday, providing he has them in stock! Quote Link to comment Share on other sites More sharing options...
GavinL Posted July 9, 2002 Share Posted July 9, 2002 Originally posted by lee_kelsey Gavin, I assumed that a larger BOV would provide a larger exit for excess gases, therefore expelling them more quickly, resulting in a 'slight' performance increase? I also don't have a stock car, I just havent got round to doing this bit yet. rgds I haven't read anything too suggest this. Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted July 9, 2002 Share Posted July 9, 2002 Originally posted by lee_kelsey Gavin, I assumed that a larger BOV would provide a larger exit for excess gases, therefore expelling them more quickly, resulting in a 'slight' performance increase? I also don't have a stock car, I just havent got round to doing this bit yet. rgds I don't think that's quite the case. I could be wrong, but i think the only advantage to an upgraded BOV is that it can work under higher pressures where the stock one can eventually fail. Oh and of course the noise, if you like that sort of thing. Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted July 9, 2002 Share Posted July 9, 2002 Not that I know anything about this on a technical level, but this is from the RaceLogic site: When the boost is increased on a modified turbo car, the standard dump valve usually cannot cope with the extra air it has to release when the throttle is shut. This can lead to permanent damage to the turbo as the air is forced back through the inlet blades. BLITZ performance piston-type dump valves are designed for modified engines up to 750 BHP. I'd be interested to know what they do do though, if anything! Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted July 9, 2002 Share Posted July 9, 2002 Originally posted by Martin F Oh and of course the noise, if you like that sort of thing. Nah, I'm sure no-one on here is that immature... Quote Link to comment Share on other sites More sharing options...
lee_kelsey Posted July 9, 2002 Author Share Posted July 9, 2002 Originally posted by GavinL I haven't read anything too suggest this. I have......! http://www.wave.co.nz/~hksnz/blowoff.html The majority of blow off valves will not show a significant increase in useable power to any turbocharged engine. The HKS SQV will increase power. The reasoning is very simple, most blow off valves are of the kind which blow OPEN under pressure, and at high boost levels these begin to open, which bleeds off boost, forcing the turbocharger to work harder to reach the required boost target. The HKS SQV blows CLOSED and can only be opened by a manifold vacuum signal.This allows a much faster turbo spool rate and decreases turbo compressor output temperatures. The HKS SQV also utilises a dual valve arrangement which allows rapid valve response when only the smaller valve is required and the ability to release large volumes of boost is easily controlled by a larger secondary valve. All HKS SQV kits are type specific and are complete with full instructions and all components required for installation. Quote Link to comment Share on other sites More sharing options...
Nic Posted July 9, 2002 Share Posted July 9, 2002 You won't feel any performance difference with an after market BOV. I would definitely recommend the HKS SQV for the sound and quality though. Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted July 9, 2002 Share Posted July 9, 2002 Originally posted by Mark Ayling I'd be interested to know what they do do though, if anything! They are supposed to prevent the compressor blades from stalling as you let off the throttle. The idea being that as you go from WOT to totally closed throttle that the compressed charge has nowhere to go and as the pressure builds up in the induction piping the compressor blades will slow down and this will increase the time it takes for the compressor to spool up again once you get back on the throttle. By putting a BOV in the induction piping you allow the pressure to be bled off(perhaps not the best term), either to atmosphere or to before the turbo's like in the stock system. Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted July 9, 2002 Share Posted July 9, 2002 Right, cheers for the explanation - so presumably there's reasons for people developing a replacement valve which "dumps" to atmosphere as opposed to how the stock one works...? Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted July 9, 2002 Share Posted July 9, 2002 Well as far as i know it's only aesthetics, i.e. it sounds nice, but i could be wrong there. Remember vent to atmosphere BOV's can cause problems on UK\US spec cars, but don't tend to on Jap spec cars due to the MAF or lack of. Quote Link to comment Share on other sites More sharing options...
randy Posted July 9, 2002 Share Posted July 9, 2002 I am using the Sard R2D2 blow off valve which is also fantastic in sound and quality and is also adjustable to release fast or slow. very loud pssssssh! check it out! http://www.takakaira.com/php/template.php3?id=702&cat=2 Quote Link to comment Share on other sites More sharing options...
GavinL Posted July 9, 2002 Share Posted July 9, 2002 Originally posted by lee_kelsey I have......! http://www.wave.co.nz/~hksnz/blowoff.html The majority of blow off valves will not show a significant increase in useable power to any turbocharged engine. The HKS SQV will increase power. The reasoning is very simple, most blow off valves are of the kind which blow OPEN under pressure, and at high boost levels these begin to open, which bleeds off boost, forcing the turbocharger to work harder to reach the required boost target. The HKS SQV blows CLOSED and can only be opened by a manifold vacuum signal.This allows a much faster turbo spool rate and decreases turbo compressor output temperatures. The HKS SQV also utilises a dual valve arrangement which allows rapid valve response when only the smaller valve is required and the ability to release large volumes of boost is easily controlled by a larger secondary valve. All HKS SQV kits are type specific and are complete with full instructions and all components required for installation. Hmmm... I would agree that there would be a performance increase in replacing any BOV that leaks under high boost pressure with this design of closed BOV. If however your BOV is not leaking where will the improvement be coming from? In addition, for this company to state that "most blow off valves are of the kind which blow OPEN under pressure, and at high boost levels these begin to open" is a bit misleading too say the least. Quote Link to comment Share on other sites More sharing options...
Syed Shah Posted July 9, 2002 Share Posted July 9, 2002 I think the best BOV would be the re-circulating ones, becuase it would not be 'dumping' the boost you have during gear changes, therefore your turbo does not have to get back up to max boost again in the next gear,which also means no sound. Quote Link to comment Share on other sites More sharing options...
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