BOV question..

[euro_urs4]

is it necessary to run a BOV, kinda confused on this now, running a down pipe, with a waste gate dump pipe, now is it necessary to still run a BOV or a diverter valve? (sorry for the newb question ;/)

[UrS4boy]

is it necessary to run a BOV, kinda confused on this now, running a down pipe, with a waste gate dump pipe, now is it necessary to still run a BOV or a diverter valve? (sorry for the newb question ;/)

Here is one opinion (yes for a BPV):

http://forums.quattroworld.com/s4s6/msgs/20994.phtml

[euro_urs4]

Here is one opinion (yes for a BPV):

http://forums.quattroworld.com/s4s6/msgs/20994.phtml

great!! exactly what i was looking for , i was running a diverter valve before and think im going to run it once again!

[DamianURS4]

excellent explanation - and a really good diagram!

[Jamo]

Never seen that before anymore info on Bosch PN 0280142110?

[skid]

Had one of those on my old uno turbo. The original split so got one of those from that firm Turbo systems back in the day. a lot of the ford Boys used em too as the standard ones on RS turbos would tear easily.

[UrS4boy]

Never seen that before. Anymore info on Bosch PN 0280142110?

I went back to a previous FAQ post that I had done and found this link that suggests that the 110 is now superceded to the 108 (a later S4 710A BPV):

http://www.audiworld.com/tech/eng21.shtml

I also found this info posted by "Chapel" (Jared):

"While I was originally told that the valve could be found on 993TTs, I am unhappy to report that is FALSE. the 993TTs use the Bosch 108 valve (branded 710A). I found my 110 Sport Valve by doing a part search on a 2000-2005 Saab 9-5 Aero. The 110 Valve comes stock in the Saab 9-5 Aero (or any Saab with the B235R motor: Viggens/Aeros). There is no Audi part number for this valve."

[Jamo]

Good article here http://www.s4biturbo.com/art-dvtests.php

[gedu]

I can dig Saab part number for you if you want to test 110 version, as I need to buy a new one for my self too

I had that on my UrS4 for 2 years, last 6 months it was subjected to 1.7bar from that tiny stock turbo. Worked like charm. After that I sold it to a friend with Saab

[euro_urs4]

another question for you guys, how to you do the piping for a diverter value with a larger turbo, do we still run the same setup as seen in the first image and where about getting the necessary silicon piping for this thanks

Quote:
Originally Posted by euro_urs4
is it necessary to run a BOV, kinda confused on this now, running a down pipe, with a waste gate dump pipe, now is it necessary to still run a BOV or a diverter valve? (sorry for the newb question ;/)
Here is one opinion (yes for a BPV):

http://forums.quattroworld.com/s4s6/msgs/20994.phtml