have a '03 x50 tip...stock...looking at intake,ecu and exhaust but want to get input on DV.... there's a few different ones out there and wandering which ones best or which ones to avoid.... which has the most correct settings/spring tension to correctly blow off without wasting boost pressure? i dont' have a prob with my stock yet but i figure i'll do it at the same time .... umw, agency, etc etc...pls help.

jimR

 

I think the popular opinion is that any of the aftermarket billet DVs are more reliable than the stock Bosch units. Some say that Bailey's are better as they claim that no routine maintenence is needed. Some say Forge are better because they can come with different tension springs and can be taken apart for routine cleaning and lubing. Some people say that many of the major brands all come from the same place, and are just "rebadged" for different vendors. People have reported problems with almost all types of DVs, and some people will swear by a specific brand.

My recommendation is to go with whichever type your tuner recommends (most tuners recommend billet type DVs, but some may recommend "upgraded" Bosch units). I would definitely change the F-hose to the silicone type while doing the DVs, as you are already there, to avoid issues with leaks from the stock rubber F-hose.

 

Link to a thread showing a pic of a huge split in the stock F-hose: https://www.6speedonline.com/forums/...all-again.html

 

ok...thanks for ur reply. i read some thread on what u r talking about....
now, the factory bosch unit is NOT serviceable? where as forge and some are serviceable in that you can take it out and clean and regrease it, from what i see...

then,....does the factory one fail 'cause we don't clean /service it? on the billet ones, how often are we supposed to service these?

my 03 x50 tip is getting .9 bar currently in stock mode....
thinking of doing the ecu and airbox/exhaust...so will do DV /f hose at the same time for sure and hence am collecting info. thanks for your replies.
jim R

 

not all billets dvs are the same.it's a job you want to do only once. get the baileys dvs. lifetime warranty.

 

The stock DVs are a "diaphragm" type of valve, different design than the billet DVs. The stock DVs fail most commonly from tears of the diaphragm, allowing boost leak.

Everyone has their opinion as to which type of DV is best. There are pros and cons of each type.

 

Alpha is correct. The OEM DV fails when under higher boost because the diaphragm is not designed to support that kind of pressure and tears.

A great upgrade would be the Agency Power DV + F-Hose. We have this package for under $350.

 

No diff in performance when I installed mine. Just good looks. I have the Forge units.

 

have two forge units, they can be yours pm me, i took off because they were not loud enough, u can hear them with stock piping but not with the evo pipingto the turbos