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blow off valve sizing ?
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rampant racing
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blow off valve sizing ? - 09-15-2010

how does one know the proper size for the bov in a blow through vortech system?i see alot of guys running the stock vortech diverter valve/bov with great success even at higher boost pressures like 14 psi,with there draw through systems.does the bov need to be bigger for a blow through system of the same 14psi?i have an adjustable billet aluminum valve but it is not any larger than the factory vortech size valve as far as the opening is concerned.i know texasblownv6 used a 44mm i believe but droptop6 used the factory diverter valve(i'm pretty sure) and both had great combo's that made alot of power.ex91 also uses the stock diverter valve with great success at 14 psi or so..is a larger than the stock vortech valve really needed for a blow through system?mine is only 20mm.same as factory vortech. thanks


2008 pony, candy red,8.8 with 4.10's/tloc,,sctx3 tuner,MT26X11.5X15 STREET ET SLICKS
pypes headers & duals with gt takeoff muffs,lakewood upper & upr double adjustable lower control arms and panhard bar,shaftmasters aluminum driveshaft, vortech v3 blower with air to air intercooler running 15psi, COOLINGMIST METH INJECTION KIT AND NOW WITH THE FIRST MODULAR BILLET ALUMINUM INTAKE MANIFOLD WITH DRY ICE COOLING CHAMBER .new personal best of 12.50@105.93 with a bad trans,dyno tune produced 415.6hp &388.9ft/lbs with all stock heads and bottom end.
   
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09-15-2010

do we have to go thru this again? this could really get xxx rated!
   
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rampant racing
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09-15-2010

seriously now tom get your mind out of the gutter lol.i need to know the best way to blow off.something not too noisy,and must be discreet.nothing sticking out in pubic view.lol i have a little one do i need a big one?or are they just for show? i'd rather have a little one that works than a big one that don't.


2008 pony, candy red,8.8 with 4.10's/tloc,,sctx3 tuner,MT26X11.5X15 STREET ET SLICKS
pypes headers & duals with gt takeoff muffs,lakewood upper & upr double adjustable lower control arms and panhard bar,shaftmasters aluminum driveshaft, vortech v3 blower with air to air intercooler running 15psi, COOLINGMIST METH INJECTION KIT AND NOW WITH THE FIRST MODULAR BILLET ALUMINUM INTAKE MANIFOLD WITH DRY ICE COOLING CHAMBER .new personal best of 12.50@105.93 with a bad trans,dyno tune produced 415.6hp &388.9ft/lbs with all stock heads and bottom end.
   
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09-15-2010

you could also do 2 of the bosch ones if you need another.
The bosch one is 'rated at 10 psi'; if it prevents compressor surge for you at your boost level, then you're fine.


Mike - "Sally", The Beast: 2005, 5.0L V8 stroker, forged/cammed, KB 2.6 blower @18psi w/GT500 h/e; ARH LT's; 4r70W full-auto trans, CircleD converter; Shaftmasters driveshaft; GT500 8.8 w/3.73's; VEI digital gauges, PLX widebands; full suspension. Current best 1/4: 10.7 @ 128, on 93 octane
(Formerly a V6 Automatic with Vortech SQ supercharger & a/a intercooler -- 310 RWHP, w/best 1/4: 12.79 @ 107)

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09-16-2010

my new bosh "style "is adjustable to to like 24 psi.it is billet aluminum.
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2008 pony, candy red,8.8 with 4.10's/tloc,,sctx3 tuner,MT26X11.5X15 STREET ET SLICKS
pypes headers & duals with gt takeoff muffs,lakewood upper & upr double adjustable lower control arms and panhard bar,shaftmasters aluminum driveshaft, vortech v3 blower with air to air intercooler running 15psi, COOLINGMIST METH INJECTION KIT AND NOW WITH THE FIRST MODULAR BILLET ALUMINUM INTAKE MANIFOLD WITH DRY ICE COOLING CHAMBER .new personal best of 12.50@105.93 with a bad trans,dyno tune produced 415.6hp &388.9ft/lbs with all stock heads and bottom end.
   
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09-16-2010

Quote:
Originally Posted by rampant racing
i'd rather have a little one that works than a big one that don't.
............


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09-16-2010

Nice, Gary!


Mike - "Sally", The Beast: 2005, 5.0L V8 stroker, forged/cammed, KB 2.6 blower @18psi w/GT500 h/e; ARH LT's; 4r70W full-auto trans, CircleD converter; Shaftmasters driveshaft; GT500 8.8 w/3.73's; VEI digital gauges, PLX widebands; full suspension. Current best 1/4: 10.7 @ 128, on 93 octane
(Formerly a V6 Automatic with Vortech SQ supercharger & a/a intercooler -- 310 RWHP, w/best 1/4: 12.79 @ 107)

2006 4.0L V6 with PH Turbo and TR6060.

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09-16-2010

I suppose a larger inlet outlet would allow the air to escape quicker, but other than that it seems that a larger one would take longer to close back up, although we probally are talking fractions of a second.

You could ask Vortech if there would be a benefit to using their mondo bov.

The vortech supplied bosch BOV on my car would not let me to have more than 9psi showing on the gauge even with the 2.62 pulley, with the now adjustable bov I have, which is very similar to yours just with a knob on the end to adjust it, allows me to see 16psi on the gauge.




2005 V6 Automatic. Vortech V2, Chargecooled, 15 PSI. 4:10's in the 7.5.

11.851@112.74 2.62 pulley
11.76@109 12psi and 75 shot
   
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09-16-2010

Ah, that was the other thing I was thinking: the valve might not be able to stay closed at higher boost pressures! Excellent, Chris, for pointing that out as a real experience!


Mike - "Sally", The Beast: 2005, 5.0L V8 stroker, forged/cammed, KB 2.6 blower @18psi w/GT500 h/e; ARH LT's; 4r70W full-auto trans, CircleD converter; Shaftmasters driveshaft; GT500 8.8 w/3.73's; VEI digital gauges, PLX widebands; full suspension. Current best 1/4: 10.7 @ 128, on 93 octane
(Formerly a V6 Automatic with Vortech SQ supercharger & a/a intercooler -- 310 RWHP, w/best 1/4: 12.79 @ 107)

2006 4.0L V6 with PH Turbo and TR6060.

It's not just racing...it's an obsession.
"The brawl inspires many, but few acheive greatness"; "Poop happens" - JujuFox
   
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09-16-2010

Quote:
Originally Posted by bluesix
............
its not the size that matters, its how you boost it



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