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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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 Posted: Mon Aug 17, 2009 10:21 pm Post subject: Selecting a blow-off valve for the UWB |
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I need to select and acquire a blow-off valve for the UWB. Before I committed to converting to EFI, it was pretty much a foregone conclusion that I'd have to replace the stock recirc valve with an aftermarket recirculating valve (since my custom turbo doesn't use the stock cold-side housing). Now that I'm going EFI, I don't have to recirculate, but I'm concerned I might get sick of the PSSSHT sound all the time, so I may stick with a recirc or plumb-back setup regardless. I know there are two primary styles, piston and valve, and I know some can be sized for boost pressure, while others can be sized for target BHP. Noise issues aside, what are the factors I need to consider when selecting a BOV?
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erstwhile owner of just about every 924 variant ever made |
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Rich H
Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK
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| Posted: Mon Aug 17, 2009 11:26 pm Post subject: |
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I thought the only choices for BOV were what colour and how loud?
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec |
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Chrenan
Joined: 15 Jan 2003
Posts: 3903
Location: Canada
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| Posted: Mon Aug 17, 2009 11:50 pm Post subject: |
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| Rich H wrote: | | I thought the only choices for BOV were what colour and how loud? |
Well played sir.
Dan, for the love of all things holy, please don't vent to the atmosphere.
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1987 951 - M193 Version for Japan |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Tue Aug 18, 2009 12:20 am Post subject: |
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| Chrenan wrote: | | Dan, for the love of all things holy, please don't vent to the atmosphere. |
 Yeah, it would be a bit out of place, eh?
Any opinion on the piston vs. valve style???
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Tue Aug 18, 2009 2:02 am Post subject: |
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Another differentiator is whether or not they require weld-on flanges as opposed to standard hose connections. To limit the amount of required fabrication, I prefer the latter, which narrows the field considerably to the following:- Perrin ASM-INT-600 (~$210)
- Tial Alpha Q (~$260)
- Go Fast Bits Plumback (~$180)
- Turbo XS (RBV-H34) Racing Bypass Valve Type H34 (~$190)
- Samco DVRL-1P-001 (~$150)
- Forge Motorsports FMDV006 (~$170)
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Chrenan
Joined: 15 Jan 2003
Posts: 3903
Location: Canada
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| Posted: Tue Aug 18, 2009 2:09 am Post subject: |
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Perrin is well known in the Subaru world, Tial in the Porsche world, either of those would likely be a quality part.
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1987 951 - M193 Version for Japan |
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Scorpio
Joined: 05 Jul 2007
Posts: 1957
Location: Brisbane, Australia
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Tue Aug 18, 2009 7:36 am Post subject: |
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Me, being how I am, would probably use this.
http://www.autospeed.com/cms/A_2188/article.html
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Tue Aug 18, 2009 2:58 pm Post subject: |
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Yeah, that's a pretty cool concept! I wish their stuff was more readily available over here...
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Tue Aug 18, 2009 3:00 pm Post subject: |
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What about idle control valve? The DTA manual doesn't include any recommendations for that...
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Tue Aug 18, 2009 4:14 pm Post subject: |
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| ideola wrote: | | Yeah, that's a pretty cool concept! I wish their stuff was more readily available over here... |
Huh? I got everything required to do that off the internet without any difficulties.
Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Tue Aug 18, 2009 4:15 pm Post subject: |
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| ideola wrote: | | What about idle control valve? The DTA manual doesn't include any recommendations for that... |
What kind of control are you looking for? just fast idle? or something more like a stepper motor? what do you have to control it? pwm?
Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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Rocco R16V
Joined: 03 May 2009
Posts: 497
Location: PNW
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| Posted: Tue Aug 18, 2009 4:47 pm Post subject: |
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IMO recirc is the only way to go!
http://www.034motorsport.com/product_info.php?cPath=21_98&products_id=781
just like the Forge but less expensive
as for the idle valve i will use a bosch one from a vw.
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"Government exists to protect us from each other. Where government has gone beyond its limits is in deciding to protect us from ourselves. "
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Tue Aug 18, 2009 9:30 pm Post subject: |
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Ah, hadn't seen their BOV, thanks for that Rocco. Any help on the part number for your Bosch idle control valve? Or alternatively, what model year & make is it from?
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gegge
Joined: 27 Jul 2007
Posts: 1124
Location: Sweden
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| Posted: Wed Aug 19, 2009 12:38 am Post subject: |
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What about the standard Bosch 0 280 142 106 (VAG#034 145 710A), found in all Audi turbo models or the uprated 06A-145-710-N. (Bosch sport is 110). Exact the same att 944 turbo except for metal diaphragm istead of rubber (Porsche 944 Bosch PN 0 280 142 108). The Porsche part number is 993.110.337.5
Saab Turbos use the Bosch PN0 280 142 103
Sport Quattro and Porsch 964 turbo use 0 280 142 102
Not fancy, only high quality. Comes in Henry Ford color - black 
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Carl Fredrik Torkildsen
924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs |
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924 FAQ (Technical)
