DV?!?
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DV?!?
Ok please excuse my ignorance but I have seen many people talking about replacing the DV on their TT's. I feel stupid asking but what is is it, where is it and why is everyone replacing them. oh yeah. my mom and I are getting my dad something for the TT for Christmas..what would you guys recomend as a first aftermarket mod. I'ts a totally stock 01' 225QC only a week and a half old..thanx
AJ
AJ
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From: Minneapolis, MN 'burbs
DV = Diverter Valve (i.e., Bypass Valve)....
from the Turbo5 Web site:
<i>Introducing the Bailey Motorsports Alloy Diverter Valve kit for the 1.8T & 2.7T! The stock diverter valve used in the 1.8T and 2.7T powerplants are prone to leakage, noise, and surging. Bailey Motorsports has developed a direct-replacement, piston-type diverter valve that eliminates all of the above problems. These piston-type valves can handle up to 4 bar (~60 psi) of boost and have ~75% more flow capacity than the OE Valve. These valves eliminate off boost stalling, the resulting jerkiness, and the throttle lag. Each and every valve is pressure-tested prior to leaving the manufacturing process. Highly recommended for all chipped 1.8T and 2.7T engines. Install is a very easy 10 minute bolt-in.</i><ul><li><a href="http://Bailey%20DV%20from%20Turbo5">Turbo5</a></li></ul>
<i>Introducing the Bailey Motorsports Alloy Diverter Valve kit for the 1.8T & 2.7T! The stock diverter valve used in the 1.8T and 2.7T powerplants are prone to leakage, noise, and surging. Bailey Motorsports has developed a direct-replacement, piston-type diverter valve that eliminates all of the above problems. These piston-type valves can handle up to 4 bar (~60 psi) of boost and have ~75% more flow capacity than the OE Valve. These valves eliminate off boost stalling, the resulting jerkiness, and the throttle lag. Each and every valve is pressure-tested prior to leaving the manufacturing process. Highly recommended for all chipped 1.8T and 2.7T engines. Install is a very easy 10 minute bolt-in.</i><ul><li><a href="http://Bailey%20DV%20from%20Turbo5">Turbo5</a></li></ul>
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Don't be fooled by the 60-PSI number!!! It's not what you think...
I've tested a Bailey's vacuum rating and it cracks open at 12" to 13" of Hg and is fully open (or piston is pushed against it's mechanical stop) at about 18" to 20" of HG.
12" of HG equates to 5.9psig or 20.6 psia. And 20" of HG equates to 9.8psig or 24.5psia. 60psi might only mean that the valve was designed to a safety factor of 2.5 x 24.5psia or 60psia before it blows its pressed in top or it looses a seal between the piston and its sleeve.
Nobody runs 45 psig boost in street applications and even if they managed to miraculously do it without blowing the head clear off the engine block the spring in the Bailey will not be able to handle the pressure without the aid of the counter reacting pressure on the back side or vacuum side of the piston.
12" of HG equates to 5.9psig or 20.6 psia. And 20" of HG equates to 9.8psig or 24.5psia. 60psi might only mean that the valve was designed to a safety factor of 2.5 x 24.5psia or 60psia before it blows its pressed in top or it looses a seal between the piston and its sleeve.
Nobody runs 45 psig boost in street applications and even if they managed to miraculously do it without blowing the head clear off the engine block the spring in the Bailey will not be able to handle the pressure without the aid of the counter reacting pressure on the back side or vacuum side of the piston.
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