MarkB Posted August 15, 2006 Report Share Posted August 15, 2006 Anyone tried one of these valves on a car yet and care to comment? The installation pdf has more info on it's operation Forge valve Link to comment Share on other sites More sharing options...
petsy Posted August 15, 2006 Report Share Posted August 15, 2006 you do know that it doesn't increase performance... Link to comment Share on other sites More sharing options...
MarkB Posted August 15, 2006 Author Report Share Posted August 15, 2006 I do realise that. Just thought it would be interesting to hear if anyone had tried one. Personaly I wouldn't want to live with the noise all the time. But for some people the noise would be a bonus Link to comment Share on other sites More sharing options...
Cupramax Posted August 16, 2006 Report Share Posted August 16, 2006 I've actually driven Forge's mk5 Golf Gti demo car complete with induction kit and their DV. The only way I can find of describing it was like driving Darth Vader. Its certainly makes the right noises... they actually have a switchable DV I believe so you can have the noise when you want it and turn off when you dont. edit.. heres the switchable one. http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=0102&product=FMFSITA Link to comment Share on other sites More sharing options...
MarkB Posted August 16, 2006 Author Report Share Posted August 16, 2006 [ QUOTE ] I've actually driven Forge's mk5 Golf Gti demo car complete with induction kit and their DV. The only way I can find of describing it was like driving Darth Vader. Its certainly makes the right noises... they actually have a switchable DV I believe so you can have the noise when you want it and turn off when you dont. edit.. heres the switchable one. http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=0102&product=FMFSITA [/ QUOTE ] This would mean going under the car every time you want to change though wouldn't it... PITA Link to comment Share on other sites More sharing options...
Cupramax Posted August 16, 2006 Report Share Posted August 16, 2006 True but its a damn sight easier than changing the whole DV... Link to comment Share on other sites More sharing options...
MarkB Posted August 16, 2006 Author Report Share Posted August 16, 2006 [ QUOTE ] True but its a damn sight easier than changing the whole DV... [/ QUOTE ] I note that the adjustable one doesn't fit on the A4 due to clearance! Thats a supprise Link to comment Share on other sites More sharing options...
gambba Posted August 18, 2006 Report Share Posted August 18, 2006 If you do a search you should find plenty of discussions on DV's and the pros and cons for the recirc type and atmospheric types. In theory with an atmospheric type you will loose power and pick up between gear changes, and this is why the recirc is better as it keeps the turbo speed up when off the gas.....however the noise of a DV venting is something I'll always love. I've never seen the actual evidence of power loss from the atmospheric DV's, but it stands to reason that it is there but whether or not you'll notice it is another thing. If you want the noise and knowledge that you aren't loosing power or fecking with the system then get an CAI instead, as this amplifies the standard DV nicely. Link to comment Share on other sites More sharing options...
gambba Posted August 18, 2006 Report Share Posted August 18, 2006 [ QUOTE ] I note that the adjustable one doesn't fit on the A4 due to clearance! Thats a supprise [/ QUOTE ] Engine fitment of longitudinal versus transverse a difference in layout in intake and turbo piping. Link to comment Share on other sites More sharing options...
MarkB Posted August 18, 2006 Author Report Share Posted August 18, 2006 [ QUOTE ] [ QUOTE ] I note that the adjustable one doesn't fit on the A4 due to clearance! Thats a supprise [/ QUOTE ] Engine fitment of longitudinal versus transverse a difference in layout in intake and turbo piping. [/ QUOTE ] Ah, yes, forgot about that Link to comment Share on other sites More sharing options...
MarkB Posted August 18, 2006 Author Report Share Posted August 18, 2006 The theory behind venting to atmos is that the air that would otherwise be recirc'd has been heated by the turbo so you want to dump it in favour of fresh air Link to comment Share on other sites More sharing options...
RedRobin Posted August 18, 2006 Report Share Posted August 18, 2006 [ QUOTE ] If you want the noise and knowledge that you aren't loosing power or fecking with the system then get an CAI instead, as this amplifies the standard DV nicely. [/ QUOTE ] ....My Carbonio CAI on Mk5 GTI doesn't make much extra noise at all (unfortunately) - Just more of a soft 'Phwack' on gear changes. The GTI's 2.0T FSI has a Diverter rather than Dump Valve. I've got a proper 200+ mile drive tomorrow so we'll see if I hear more turbo 'noise'. The same Carbonio CAI fits Audi A3, VW Jetta and Passat 2.0 FSI engines. My VW dealer fitted it for me so warranty should be preserved. I don't know enough to fiddle with my engine system. Link to comment Share on other sites More sharing options...
danksy Posted August 18, 2006 Report Share Posted August 18, 2006 You will lose power from using an atmospheric "dump" valve since the air that has been "dumped" has already been metered, hence the fueling will be wrong A recirculation, or diverter valve is what is fitted OEM, however the original valves have had some quality issues in the past, which has made them slow to release. Horse for courses really, had them both changed from OEM diverter valve to Forge Diverter Valve (re-circulating) on both TT's but for peace of minds sake since i got through 3 OEM Bosch DV's on my first TT Link to comment Share on other sites More sharing options...
MarkB Posted August 18, 2006 Author Report Share Posted August 18, 2006 [ QUOTE ] You will lose power from using an atmospheric "dump" valve since the air that has been "dumped" has already been metered, hence the fueling will be wrong A recirculation, or diverter valve is what is fitted OEM, however the original valves have had some quality issues in the past, which has made them slow to release. Horse for courses really, had them both changed from OEM diverter valve to Forge Diverter Valve (re-circulating) on both TT's but for peace of minds sake since i got through 3 OEM Bosch DV's on my first TT [/ QUOTE ] Different type of valve completely to the one fitted on the 2.0T Link to comment Share on other sites More sharing options...
RedRobin Posted August 18, 2006 Report Share Posted August 18, 2006 These two illustrative pics may help to further explain the DV on the 2.0T FSI: My apologies if everyone already knows this info or if I'm barking up the wrong tree. Link to comment Share on other sites More sharing options...
danksy Posted August 18, 2006 Report Share Posted August 18, 2006 Principle is still the same though for recirculating vs atmospheric Link to comment Share on other sites More sharing options...
danksy Posted August 18, 2006 Report Share Posted August 18, 2006 Where does the output from the OEM dv go? Back to the airbox? Link to comment Share on other sites More sharing options...
RedRobin Posted August 18, 2006 Report Share Posted August 18, 2006 [ QUOTE ] Where does the output from the OEM dv go? Back to the airbox? [/ QUOTE ] ....I've no idea! I just supply the artwork! It's part of a 36-page pdf - I'll have a look but don't hold your breath. Link to comment Share on other sites More sharing options...
danksy Posted August 18, 2006 Report Share Posted August 18, 2006 My reply popped up after you posted your diagram The air inside the closed loop-recirculating DV has indeed been metered, and is let back into the throttle body once the DV closes.... Thus if this air is vented to atmosphere "dumped" the fuel/air mixture will be all wrong, and you will lose power Link to comment Share on other sites More sharing options...
RedRobin Posted August 18, 2006 Report Share Posted August 18, 2006 ....So, if I understand it correctly, because the metered air is not 'dumped', we don't hear any 'whooshy' sounds. What's the soft airy 'phwack' I'm hearing on gear changes since fitting my CAI? Btw, here's another illustration if it helps anyone: Link to comment Share on other sites More sharing options...
MarkB Posted August 18, 2006 Author Report Share Posted August 18, 2006 Whats the pdf you have? Could you share it? The soft phwack is the air being sent back to the inlet tract just after the MAF Link to comment Share on other sites More sharing options...
RedRobin Posted August 18, 2006 Report Share Posted August 18, 2006 I would be very happy to share it. I've got a .zip file - How do I share it? PM me for an email address? - Please advise. Pdf is called "2.0 TFSI Engine" and is a self-study American program from VW. So, before I fitted the carbon fibre CAI, I didn't hear that 'phwack' except under very hard driving. I guess my new aftermarket CAI is amplifying it. Link to comment Share on other sites More sharing options...
MarkB Posted August 18, 2006 Author Report Share Posted August 18, 2006 [ QUOTE ] I would be very happy to share it. I've got a .zip file - How do I share it? PM me for an email address? - Please advise. Pdf is called "2.0 TFSI Engine" and is a self-study American program from VW. So, before I fitted the carbon fibre CAI, I didn't hear that 'phwack' except under very hard driving. I guess my new aftermarket CAI is amplifying it. [/ QUOTE ] I don't know about amplify, probably more less sound proofing. PM sent for SSP Thanks Link to comment Share on other sites More sharing options...
RedRobin Posted August 18, 2006 Report Share Posted August 18, 2006 SSP emailed Link to comment Share on other sites More sharing options...
MarkB Posted August 18, 2006 Author Report Share Posted August 18, 2006 Got it Thanks Just re-read my previous post. I meant to say that it's more likely to be less sound proofing. Rather than 'more less sound proofing' Link to comment Share on other sites More sharing options...
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