[s-cars] BPVs

[Trevor Frank]

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When?

Check there web site,

<SNIP>
Early production vehicles had a Bosch bypass valve with the number
ending in 108 or Audi 710A which due to problems would eventually be
superceded by a Bosch 114 or Audi 710N.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 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."

Now we offer the most appropriate and functional valve from Bosch for
the Audi products.



<SNIP>

	-----Original Message-----
	From: Djdawson2 at aol.com [mailto:Djdawson2 at aol.com]
	Sent: Monday, June 23, 2003 9:56 AM
	To: Trevor Frank; pkrasusky at ups.com; s-car-list at audifans.com
	Subject: Re: [s-cars] BPVs


	In a message dated 6/23/2003 10:36:30 AM Mountain Daylight Time,
tfrank at symyx.com writes:



		I don't know if this is true with the Motor sports Bosch
		valve though.



	I disassembled both valves... the internals are identical, save
the spring, on the "hp" version and the original version.

	Notice Hoppen and MTM no longer recommend the 710X valves



		for High HP applications.




	Odd... that's what they recommended to me??
	Dave


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