Dragonball Posted September 30, 2002 Share Posted September 30, 2002 Quick question - help please guys HKS BOV SSQV or Blitz Super Sound BOV? Also looking to get a second hand one - and need to know whether these are Supra specific or universal (as is claimed) and how difficult to fit/adapt if it has been on another make of car For instance will the Blitz - coming of a JZ1 engine (Mark 111 ?) easily go on to mine? Many thanks Cheers Paul:cool: Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted September 30, 2002 Share Posted September 30, 2002 Right this is all from hard earned experience:( Old style Blitz didn't seem to work well. HKS SSBOV works well on stock turbo's( Mine only lasted 2 years before going bad though). New Blitz works very well on bigger turbo cars to eliminate part throttle surge, which isn't a problem on stock turbo's. I am running 2 now. 1 New Blitz prior to the FMIC & 1 HKS SSBOV after. Quote Link to comment Share on other sites More sharing options...
Dragonball Posted September 30, 2002 Author Share Posted September 30, 2002 Thanks Terry - which is the Old/new blitz? Trumpet shape is the one I am looking at. Will they fit also? Cheers Paul Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted September 30, 2002 Share Posted September 30, 2002 They sell a weld on boss or a hardpipe for the Supra. The new type has two outlets, one for part throttle. See picture: Quote Link to comment Share on other sites More sharing options...
Gaz Walker Posted September 30, 2002 Share Posted September 30, 2002 Guys, On my old car car I had a blitz C1 filter and Blitz Blow-off valve (first for the rover!) fitted and it sounded ace. I am getting the blitz filter for the car (which blitz say wont fit) and I wouldn't mind the blitz blow off - which fensport say on there site say it won't fit a UK Auto - anyone know why? Cheers Gaz. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted September 30, 2002 Share Posted September 30, 2002 No? They use them all the time in the States Gaz, just look at MVP site. I know there was some discussion a while back about using a recirculating type due to the MAF sensor, but haven't heard of a problem with anyone actually using them? Quote Link to comment Share on other sites More sharing options...
Gaz Walker Posted September 30, 2002 Share Posted September 30, 2002 Originally posted by Terry Saunders No? They use them all the time in the States Gaz, just look at MVP site. I know there was some discussion a while back about using a recirculating type due to the MAF sensor, but haven't heard of a problem with anyone actually using them? Terry, "Super Sound Dump Valve - Complete kit - Not UK auto!" Strange? Cheers terry, BTW, going to send you a PM in a sec.. Gaz. Quote Link to comment Share on other sites More sharing options...
AJI Posted September 30, 2002 Share Posted September 30, 2002 I'm also thinking about getting a BOV or a dump valve. Sorry to hijack this thread but can you guys clarify something.... Basicaly is the following true? (1) A BOV discharges turbo pressure to atmospheric and through doing so this has an increasing effect on turbo lag. (It does away with the pre-spool of the turbo's.) (2) A dump valve which is a different device altogether will send the pressure back into the turbo system and by doing so will keep tubo's spinning ready for next use of accelerator. I'm not all that knowledgeable when it comes to certain parts of engine operation, previously I've always thought BOV's and dump vales were the same thing! Are statements (1) & (2) correct? Quote Link to comment Share on other sites More sharing options...
Gaz Walker Posted September 30, 2002 Share Posted September 30, 2002 Originally posted by AJI (1) A BOV discharges turbo pressure to atmospheric and through doing so this has an increasing effect on turbo lag. (It does away with the pre-spool of the turbo's.) (2) A dump valve which is a different device altogether will send the pressure back into the turbo system and by doing so will keep tubo's spinning ready for next use of accelerator. I'm not all that knowledgeable when it comes to certain parts of engine operation, previously I've always thought BOV's and dump vales were the same thing! Are statements (1) & (2) correct? To be honest a dump valve and a blow-off valve are the same thing, just different names to justify the expense... Really there is only 3 different dump/blow-off valves. 2 are the same just a different name 1) Re-circulating dump valve (this is what the car has as standard) 2) Dump Valve (atmospheric - i.e. makes a noise) 3) Blow-off Valve 2 and 3 are the same. You can buy an uprated/aftermarket version of number 1, but they aren't many people who change to these - most people want a DV/blow-off just to make a noise... Gaz. Quote Link to comment Share on other sites More sharing options...
paulrenn Posted September 30, 2002 Share Posted September 30, 2002 BOV and "dump valve" are just different names for same thing. The difference is that you can have BOV that vents to atmosphere, as in your example (1), or that recirculates the air back into the intake system, as in your example (2). The stock Supra BOV is type (2), but type (1) makes a much cooler sound Actually, while we're here, what is the point of replacing the stock Supra BOV...does it just not flow enough air for tuned engines? Or is it just for the sound effects Quote Link to comment Share on other sites More sharing options...
Gaz Walker Posted September 30, 2002 Share Posted September 30, 2002 Originally posted by paulrenn BOV and "dump valve" are just different names for same thing. great minds think alike Paul Quote Link to comment Share on other sites More sharing options...
paulrenn Posted September 30, 2002 Share Posted September 30, 2002 LOL, yeah, your post wasn't there when I hit the reply button, and then suddenly, two posts saying the same thing! Or should the saying be, "fools never differ" Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted September 30, 2002 Share Posted September 30, 2002 Nice one guys. There are actually 2 different types of BOV. 1 is push & 1 is pull. They release excess pressure in the sytem when the throttle plate closes. This in theory stops the excess pressure trying to go back through the turbo & twisting the shafts. You don't want the BOV dumping too much pressure or too early as this will increase lag. You can adjust most BOV's by tightening down the spring. Quote Link to comment Share on other sites More sharing options...
Gaz Walker Posted September 30, 2002 Share Posted September 30, 2002 Originally posted by paulrenn Or should the saying be, "fools never differ" lmao Gaz. Quote Link to comment Share on other sites More sharing options...
Gaz Walker Posted September 30, 2002 Share Posted September 30, 2002 Originally posted by Terry Saunders Nice one guys. There are actually 2 different types of BOV. 1 is push & 1 is pull. They release excess pressure in the sytem when the throttle plate closes. This in theory stops the excess pressure trying to go back through the turbo & twisting the shafts. You don't want the BOV dumping too much pressure or too early as this will increase lag. You can adjust most BOV's by tightening down the spring. Clever bugger Gaz. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted September 30, 2002 Share Posted September 30, 2002 Originally posted by gazwalker Clever bugger Gaz. If only:rolleyes: Also, someone asked if it was necessary to change the stock one. NO. If you are running stock turbo's the stock BOV is sufficient. They can go bad though. If you just want the noise get an induction kit, as the stock BOV is loud without the silencing effect of the air box. If you start winding the boost up & increasing airflow significantly then an aftermarket one may be a good idea. Quote Link to comment Share on other sites More sharing options...
paulrenn Posted September 30, 2002 Share Posted September 30, 2002 Actually, while we're here, what is the point of replacing the stock Supra BOV Am I allowed to ask the question again, and at the same time sneakily bump up my post count? I'd really like to know the answer actually Quote Link to comment Share on other sites More sharing options...
Adam W Posted September 30, 2002 Share Posted September 30, 2002 Can someone explain to me what "part-throttle surge" is? I've never heard of it before, but I think I might have it, I'm certainly getting some odd stuff happen on my car when using different amounts of accelerator pedal . . . Quote Link to comment Share on other sites More sharing options...
Gaz Walker Posted September 30, 2002 Share Posted September 30, 2002 Originally posted by paulrenn Am I allowed to ask the question again, and at the same time sneakily bump up my post count? I'd really like to know the answer actually Yeah you got it right... Eventually it won't be able to cope with the presure of silly boost. Don't know what the level is though? Gaz. Quote Link to comment Share on other sites More sharing options...
Adam W Posted September 30, 2002 Share Posted September 30, 2002 Originally posted by paulrenn Am I allowed to ask the question again, and at the same time sneakily bump up my post count? I'd really like to know the answer actually Absolutely no point in replacing the stock BOV except that it makes a "PSSCHEW" noise when you lift off or change gear, as long as you're on stock turbos or (probably) hybrid turbos. If you're running mega boost from a big single or GT Twins than there is so much air whooshing about that you need a bigger/stronger valve to release it all quickly. Quote Link to comment Share on other sites More sharing options...
Branners Posted September 30, 2002 Share Posted September 30, 2002 And dont forget, an auto supra never really eases off the accelerator enough to get a decent noise out of the aftermarket dump valves, you really have to be fully throttle and then jump off the accelerator to make it make a decent sound. JB Quote Link to comment Share on other sites More sharing options...
Dragonball Posted September 30, 2002 Author Share Posted September 30, 2002 So basically it's a bit of a toy in an auto? Unless you are running stock+ turbos etc Just to come back to the original question - are the HKS universal fitting (sorry if I missed an answer on this Terry) Cheers Paul:cool: Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted September 30, 2002 Share Posted September 30, 2002 Just to throw a spanner in the works, I've been recommended to get one as I'm already getting 'throttle surge' or 'turbo stall' in my auto if I go from full throttle to just light throttle. I get a kind of droning noise and the car seems unresponsive for a couple of seconds, then drive normal again. (Full throttle gives me about 1.3 bar, btw) Apparently, getting an aftermarket BOV will cure the problem and this is what they are supposed to do... The above should be pretty acurate as it was advised from a very knowledgeable person But my translation may have got some og the details wrong I do car electrics, not engines! I've always tried to steer away from them but apparently, now I need one. Quote Link to comment Share on other sites More sharing options...
Dragonball Posted September 30, 2002 Author Share Posted September 30, 2002 Matt - matter of interest I am looking to get a few bits n bobs from Japan (no offense to anyione selling on-list!0 If you are interested in me ordering you one let me know - I will check on price etc Mail me offlist - cheers Paul:cool: Quote Link to comment Share on other sites More sharing options...
paulrenn Posted September 30, 2002 Share Posted September 30, 2002 Hi Matt, Has your car always exhibited this symptom, or just started? Did you make any changes (ie mods) after which this started? Quote Link to comment Share on other sites More sharing options...
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