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A bypass valve will release turbo pressure between shifts. The term "bypass" relates to the idea that the turbo air is then rerouted back into the intake. These valves are designed to be fully open in any amount of vacuum, so they can only be routed back into the intake, otherwise stalling would occur. It can be argued this is the "proper" way to release turbo pressure so that no air is ever lost from the intake system. This is also the same setup that the ST205 GT-four and Supra Turbos use.
Standard bypass valve, great starter to preserve turbo life. Has a tendency to hang open during part throttle. Known as a "hoot". They range from $33-$45 retail depending on which version you would like to use.
Sound: Owl Hooting sound, Listen (wav)
Note: The inlet and outlet of this valve are considerably larger than stock, custom hoses are required. These can fail.
|
Style |
BOSCH # | AUDI # | PORSCHE # |
| Standard | 0280142103 | ||
| Tough (Thicker diaphragm, Long Life) | 0280142102 | 035 145 710 | 944 Twin turbo |
|
Metal (Brass Piston, Fast Response) |
0280142108 | 034 145 710C | 993.110.337.50 |
| *UPDATE: The standard version is available from ABJ, $20.50 + shipping. Call 888-885-3500. | |||
| *UPDATE: The metal version is available from Powertech in NJ, $25 + 7 shipping. Call 973-586-3210. Ask for Mike or Andreas. | |||
| *UPDATE: 102 BOSCH has been taken over by 108. Meaning if you ask for 102 you will most likely get 108. | |||
(UK)
This bypass valve version of the popular Bailey dump valve is designed to be a high quality upgrade for the Bosch BOV. This is a full metal piece which will not wear out over time. It is also capable of holding very high boost pressure reliably.
PN# DV 30 Dump Valve (Bypass Style) £99.88
Retail Price $150
Street Price $125
Note: The inlet and outlet of this valve are considerably larger than stock, custom hoses are required. Now available in the US and with multiple colors!
Pics (Large):
This is the "racing" version of the popular Turbo XS Blow Off Valve series. The company claims extremely high flow rates. It is designed to be routed back into the intake system for the best response during racing situations.
|
Description |
Part # |
Price |
|
Type H Racing Bypass |
#RBV H34 |
$179 |
|
Type H 90 degree flange |
|
$ 39 |
|
Type H tube adapter flange |
$ 39 |
Note: The inlet and outlet of this valve are considerably larger than stock, custom hoses are required.
*You can receive $30 off XS valves at carparts.com by clicking HERE. The discount will automatically be applied!
