BOSCH 110 Valve

Early production vehicles had a Bosch bypass valve with the number ending in 108 or Audi 710A which due to problems would eventually be superseded by a Bosch 114 or Audi 710N. This valve was far better in performance but still not completely reliable especially under modified conditions.

MTM did extensive research on various bypass valves also called diverter valves for their 400 -500HP kits and came up with the Bosch Sport Valve 110 being the best in performance and durability, even over more expensive aftermarket valves. At JHM we also tested various options and concur with MTM’s findings. With the Bosch Sport Valve the boost recovery and throttle response are enhanced significantly and since it is dimensionally the same as the original the installation is simple.

As stated in Audi’s technical bulletin dated Dec. 8, 2000 the bypass valves should be replaced should the following occur: “Groaning or howling noise from engine compartment when accelerating during partial load between 2500-3000 RPM,” or “ Rattling noise when decelerating between 2000-3000 RPM,” which “may be caused by the internal diaphragm of the charge pressure bypass valve producing pulsating noises.”