Just put in the DV that I bought off ebay... Its actually very good quality... and the sound is amazing... sounds like a sputtering intake...
its only about 65 shipped...
i just figure i would let you all know...
heres the link: httphttp://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=260205700 607&ssPageName=STRK:MEWN:IT&ih=016
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1998 A4 1.8T Manual, 17" ASA Black w/chrome lip, Magnaflow, K&N Intake,vdo boost gauge, APR, DV ,euro plate,tinted tails, clear side markers, kenwood cd player, kenwood rear speakers,2 1500 watt 12" kenwood subs, 1000 watt kenwood amp.
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Valve fluttering is commonly thought to be an automatic indicator of compressor surging, and I would like to put that rumor to rest right now. This could not be further from the truth.
Compressor surging (caused by a bypass valve) implies that the bypass valve is not opening fully to allow the optimal amount of airflow required to keep the compressor wheel of the turbo spinning at an optimal speed.
Bypass valve fluttering will occur under various circumstances, so please consider under what situations you are experiencing fluttering before you presume that compressor surging is taking place, or more importantly, before it is assumed that a problem even exists.
Valve fluttering under wide open throttle or full boost throttle lift, again, typically means that a valve is tuned or adjusted to stiffly, and while this can lead to compressor surging and potential damage over an extended period of time, if the user fixes the issue quickly, no significant damage will occur. It would only be after prolonged use of a valve in an improperly tuned configuration that compressor surging MAY lead to damage or excessive wear on the turbocharger.
Valve fluttering under partial throttle or partial boost throttle lift, on the other hand, is a completely normal occurrence and IS NOT an indication of compressor surging by any measure.
Partial throttle or partial boost valve fluttering is solely an indication that the valve is directly responding to the inconsistent pressure differential on either side of the throttle plate (throttle body).
An internal combustion engine naturally creates a vacuum effect during the intake stroke of a given cylinder. When boost pressure is built from the turbocharger, it will reach a certain level inside the intercooler piping, but as it enters the intake manifold, it is almost instantly reduced by a given amount of vacuum created by the intake stroke of the engine, thus resulting in a marginally lesser amount of boost pressure inside the intake manifold compared to inside the intercooler piping.
Since the bypass valve sees references from both of these pressure sources, the sealing surface of the valve, be it a diaphragm or a piston, will respond to these differences in pressure, as minor or severe as they may be. This sealing surface response is what is creating the fluttering effect at partial throttle or partial boost throttle lift.
It may be more pronounced on some applications than others, and as mentioned above, the OEM Evo valves incorporates a feature to combat this issue, and while it will always be present to a small extent, it is not a problem for the vehicle in any way whatsoever.
just read that but im still confused? Do i really have to put it in backwards or no?
Its holding boost just fine...
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1998 A4 1.8T Manual, 17" ASA Black w/chrome lip, Magnaflow, K&N Intake,vdo boost gauge, APR, DV ,euro plate,tinted tails, clear side markers, kenwood cd player, kenwood rear speakers,2 1500 watt 12" kenwood subs, 1000 watt kenwood amp.
Diverter Valve SWEET DEAL
