# BOV's, marketing gimmick? Let's get technical. **URL:** \ **Category:** SON240sx Automotive\ **Created:** [May 22, 2006, 10:31pm UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206 "2006-05-22T22:31:45Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![QuincyRedS14](https://avatars.discourse-cdn.com/v4/letter/q/dbc845/32.png) [@QuincyRedS14](https://forums.speedlife.net/u/QuincyRedS14)\ **Post date:** [May 22, 2006, 10:31pm UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/1 "2006-05-22T22:31:45Z")
Blitz and HKS work the same, both are dual stage. In fact, Blitz may be more durable since it is piston type and HKS is diagphram type. However, Blitz cannot hold more than 1.3 bar and require a stiffer spring for higher boost. Greddy and Tial work along the same principles, both are diagphram type and I think Tial may be a better choice because of the larger valve=open less=more response. I’m not that technical so I’m asking you for advise. Blitz DD (Dual Drive) for maximum response (small port for low boost + larger port for high boost) Includes mini SUS filter Urethane gasket to ensure complete seal Tension adjustable Holds to 1.2 BAR (18psi - Standard Spring) Available hard spring(25psi+ boost) for high boost applications HKS dual stage pull type relief valves that by design do not leak under high boost conditions or under idle vacuum and is actuated by pressure alterations to ensure a quick primary and secondary valve response. For maximum performance, the HKS SSQV incorporates both a small primary valve for ultra quick activation, along with a larger secondary valve for additional discharge capacity. The SSQV is engineered to initially open the small primary valve at light throttle and load conditions, then sequentially opens the secondary valve for additional relief capacity under high boost and load conditions. The triple-fin discharge port design produces a powerful and unique aggressive blow-off sound along with added visual distinction. Greddy Type RS [http://www.tyrantmotorsports.com/index.php/action/item/id/1553/prevaction/category/previd/new/prevstart/150/Greddy%20Type%20RS%20BOV/](http://www.tyrantmotorsports.com/index.php/action/item/id/1553/prevaction/category/previd/new/prevstart/150/Greddy%20Type%20RS%20BOV/) Tial [http://www.tyrantmotorsports.com/index.php/action/item/id/11/prevaction/category/previd/new/prevstart/150/Tial%2050MM%20BOV/](http://www.tyrantmotorsports.com/index.php/action/item/id/11/prevaction/category/previd/new/prevstart/150/Tial%2050MM%20BOV/) ---
**Author:** ![QuincyRedS14](https://avatars.discourse-cdn.com/v4/letter/q/dbc845/32.png) [@QuincyRedS14](https://forums.speedlife.net/u/QuincyRedS14)\ **Post date:** [May 22, 2006, 10:31pm UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/2 "2006-05-22T22:31:45Z")
Blitz and HKS work the same, both are dual stage. In fact, Blitz may be more durable since it is piston type and HKS is diagphram type. However, Blitz cannot hold more than 1.3 bar and require a stiffer spring for higher boost. Greddy and Tial work along the same principles, both are diagphram type and I think Tial may be a better choice because of the larger valve=open less=more response. I’m not that technical so I’m asking you for advise. Blitz DD (Dual Drive) for maximum response (small port for low boost + larger port for high boost) Includes mini SUS filter Urethane gasket to ensure complete seal Tension adjustable Holds to 1.2 BAR (18psi - Standard Spring) Available hard spring(25psi+ boost) for high boost applications HKS dual stage pull type relief valves that by design do not leak under high boost conditions or under idle vacuum and is actuated by pressure alterations to ensure a quick primary and secondary valve response. For maximum performance, the HKS SSQV incorporates both a small primary valve for ultra quick activation, along with a larger secondary valve for additional discharge capacity. The SSQV is engineered to initially open the small primary valve at light throttle and load conditions, then sequentially opens the secondary valve for additional relief capacity under high boost and load conditions. The triple-fin discharge port design produces a powerful and unique aggressive blow-off sound along with added visual distinction. Greddy Type RS [http://www.tyrantmotorsports.com/index.php/action/item/id/1553/prevaction/category/previd/new/prevstart/150/Greddy%20Type%20RS%20BOV/](http://www.tyrantmotorsports.com/index.php/action/item/id/1553/prevaction/category/previd/new/prevstart/150/Greddy%20Type%20RS%20BOV/) Tial [http://www.tyrantmotorsports.com/index.php/action/item/id/11/prevaction/category/previd/new/prevstart/150/Tial%2050MM%20BOV/](http://www.tyrantmotorsports.com/index.php/action/item/id/11/prevaction/category/previd/new/prevstart/150/Tial%2050MM%20BOV/) ---
**Author:** ![BAS](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bas/32/5540_2.png) [@BAS](https://forums.speedlife.net/u/BAS)\ **Post date:** [May 22, 2006, 10:52pm UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/3 "2006-05-22T22:52:51Z")
it’s a simple relief valve… whats to get technical about ?? there are much better systems in use that have been around for decades in the hydraulics/pneumatics world. ---
**Author:** ![BAS](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bas/32/5540_2.png) [@BAS](https://forums.speedlife.net/u/BAS)\ **Post date:** [May 22, 2006, 10:52pm UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/4 "2006-05-22T22:52:51Z")
it’s a simple relief valve… whats to get technical about ?? there are much better systems in use that have been around for decades in the hydraulics/pneumatics world. ---
**Author:** ![G-E](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/g-e/32/5546_2.png) [@G-E](https://forums.speedlife.net/u/G-E)\ **Post date:** [May 23, 2006, 12:46am UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/5 "2006-05-23T00:46:57Z")
I always wanted to engineer my own using something along the line of cylinder head valves and levers and such, maybe actuated by mini pneumatic rams like festo makes ---
**Author:** ![G-E](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/g-e/32/5546_2.png) [@G-E](https://forums.speedlife.net/u/G-E)\ **Post date:** [May 23, 2006, 12:46am UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/6 "2006-05-23T00:46:57Z")
I always wanted to engineer my own using something along the line of cylinder head valves and levers and such, maybe actuated by mini pneumatic rams like festo makes ---
**Author:** ![Uniac](https://avatars.discourse-cdn.com/v4/letter/u/34f0e0/32.png) [@Uniac](https://forums.speedlife.net/u/Uniac)\ **Post date:** [May 23, 2006, 3:55am UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/7 "2006-05-23T03:55:37Z")
why? festo already makes a quick exhuast valve for pnumatics. ---
**Author:** ![Uniac](https://avatars.discourse-cdn.com/v4/letter/u/34f0e0/32.png) [@Uniac](https://forums.speedlife.net/u/Uniac)\ **Post date:** [May 23, 2006, 3:55am UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/8 "2006-05-23T03:55:37Z")
why? festo already makes a quick exhuast valve for pnumatics. ---
**Author:** ![G-E](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/g-e/32/5546_2.png) [@G-E](https://forums.speedlife.net/u/G-E)\ **Post date:** [May 23, 2006, 4:26am UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/9 "2006-05-23T04:26:38Z")
that’s not the point dammit how are you ever going to learn if all you do is use retail products? ---
**Author:** ![G-E](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/g-e/32/5546_2.png) [@G-E](https://forums.speedlife.net/u/G-E)\ **Post date:** [May 23, 2006, 4:26am UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/10 "2006-05-23T04:26:38Z")
that’s not the point dammit how are you ever going to learn if all you do is use retail products? ---
**Author:** ![TekVicious](https://avatars.discourse-cdn.com/v4/letter/t/d9b06d/32.png) [@TekVicious](https://forums.speedlife.net/u/TekVicious)\ **Post date:** [May 23, 2006, 6:46pm UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/11 "2006-05-23T18:46:30Z")
Quincy, Do you run a draw through MAF? If so, I’d run the HKS, as leakage is a big issue. ---
**Author:** ![TekVicious](https://avatars.discourse-cdn.com/v4/letter/t/d9b06d/32.png) [@TekVicious](https://forums.speedlife.net/u/TekVicious)\ **Post date:** [May 23, 2006, 6:46pm UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/12 "2006-05-23T18:46:30Z")
Quincy, Do you run a draw through MAF? If so, I’d run the HKS, as leakage is a big issue. ---
**Author:** ![Uniac](https://avatars.discourse-cdn.com/v4/letter/u/34f0e0/32.png) [@Uniac](https://forums.speedlife.net/u/Uniac)\ **Post date:** [May 23, 2006, 8:02pm UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/13 "2006-05-23T20:02:18Z")
> [@G-E](#): > > that’s not the point dammit > > how are you ever going to learn if all you do is use retail products? i always had thought bov’s were realy complex etc. Then i opened up my turbosmart unit…needless to say, i had it drawn up in ProE, and off to the CNC shop nextdoor within a few hours, just waiting for some free time at work to go and rip it off. No pun intended lol. ---
**Author:** ![Uniac](https://avatars.discourse-cdn.com/v4/letter/u/34f0e0/32.png) [@Uniac](https://forums.speedlife.net/u/Uniac)\ **Post date:** [May 23, 2006, 8:02pm UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/14 "2006-05-23T20:02:18Z")
> [@G-E](#): > > that’s not the point dammit > > how are you ever going to learn if all you do is use retail products? i always had thought bov’s were realy complex etc. Then i opened up my turbosmart unit…needless to say, i had it drawn up in ProE, and off to the CNC shop nextdoor within a few hours, just waiting for some free time at work to go and rip it off. No pun intended lol. ---
**Author:** ![QuincyRedS14](https://avatars.discourse-cdn.com/v4/letter/q/dbc845/32.png) [@QuincyRedS14](https://forums.speedlife.net/u/QuincyRedS14)\ **Post date:** [May 24, 2006, 1:54am UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/15 "2006-05-24T01:54:41Z")
There. You answered my question. It’s just a marketing gimmick then, they’re all the same. I’m running a MAP based system… ---
**Author:** ![QuincyRedS14](https://avatars.discourse-cdn.com/v4/letter/q/dbc845/32.png) [@QuincyRedS14](https://forums.speedlife.net/u/QuincyRedS14)\ **Post date:** [May 24, 2006, 1:54am UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/16 "2006-05-24T01:54:41Z")
There. You answered my question. It’s just a marketing gimmick then, they’re all the same. I’m running a MAP based system… ---
**Author:** ![Sasha\_SG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sasha_sg/32/5477_2.png) [@Sasha\_SG](https://forums.speedlife.net/u/Sasha_SG)\ **Post date:** [May 24, 2006, 7:15am UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/17 "2006-05-24T07:15:13Z")
Thats like saying all exhausts are the same the difference is in the design and sound, but the function is exactly the same. If there was only one brand of aftermarket bov there would be a monopoly, and since everyone wants a bite out of hte market everyone designed their own bov. Or in some instances people just copied existing bovs and sold them for less (like those fake Type-S bovs) ---
**Author:** ![Sasha\_SG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sasha_sg/32/5477_2.png) [@Sasha\_SG](https://forums.speedlife.net/u/Sasha_SG)\ **Post date:** [May 24, 2006, 7:15am UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/18 "2006-05-24T07:15:13Z")
Thats like saying all exhausts are the same the difference is in the design and sound, but the function is exactly the same. If there was only one brand of aftermarket bov there would be a monopoly, and since everyone wants a bite out of hte market everyone designed their own bov. Or in some instances people just copied existing bovs and sold them for less (like those fake Type-S bovs) ---
**Author:** ![QuincyRedS14](https://avatars.discourse-cdn.com/v4/letter/q/dbc845/32.png) [@QuincyRedS14](https://forums.speedlife.net/u/QuincyRedS14)\ **Post date:** [May 22, 2006, 10:31pm UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/19 "2006-05-22T22:31:45Z")
Blitz and HKS work the same, both are dual stage. In fact, Blitz may be more durable since it is piston type and HKS is diagphram type. However, Blitz cannot hold more than 1.3 bar and require a stiffer spring for higher boost. Greddy and Tial work along the same principles, both are diagphram type and I think Tial may be a better choice because of the larger valve=open less=more response. I’m not that technical so I’m asking you for advise. Blitz DD (Dual Drive) for maximum response (small port for low boost + larger port for high boost) Includes mini SUS filter Urethane gasket to ensure complete seal Tension adjustable Holds to 1.2 BAR (18psi - Standard Spring) Available hard spring(25psi+ boost) for high boost applications HKS dual stage pull type relief valves that by design do not leak under high boost conditions or under idle vacuum and is actuated by pressure alterations to ensure a quick primary and secondary valve response. For maximum performance, the HKS SSQV incorporates both a small primary valve for ultra quick activation, along with a larger secondary valve for additional discharge capacity. The SSQV is engineered to initially open the small primary valve at light throttle and load conditions, then sequentially opens the secondary valve for additional relief capacity under high boost and load conditions. The triple-fin discharge port design produces a powerful and unique aggressive blow-off sound along with added visual distinction. Greddy Type RS [http://www.tyrantmotorsports.com/index.php/action/item/id/1553/prevaction/category/previd/new/prevstart/150/Greddy%20Type%20RS%20BOV/](http://www.tyrantmotorsports.com/index.php/action/item/id/1553/prevaction/category/previd/new/prevstart/150/Greddy%20Type%20RS%20BOV/) Tial [http://www.tyrantmotorsports.com/index.php/action/item/id/11/prevaction/category/previd/new/prevstart/150/Tial%2050MM%20BOV/](http://www.tyrantmotorsports.com/index.php/action/item/id/11/prevaction/category/previd/new/prevstart/150/Tial%2050MM%20BOV/) ---
**Author:** ![BAS](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bas/32/5540_2.png) [@BAS](https://forums.speedlife.net/u/BAS)\ **Post date:** [May 22, 2006, 10:52pm UTC](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206/20 "2006-05-22T22:52:51Z")
it’s a simple relief valve… whats to get technical about ?? there are much better systems in use that have been around for decades in the hydraulics/pneumatics world. [Next page](https://forums.speedlife.net/t/bovs-marketing-gimmick-lets-get-technical/96206.md?page=2)