DV Install
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AudiWorld Senior Member
Joined: Jun 2003
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DV Install
Gonna install the dv this week. ive been reading and many ppl say install it backwards. whats the point of this and is it necessary.
shouldn't i just install the new dv the same way as the stock one?
shouldn't i just install the new dv the same way as the stock one?
AudiWorld Super User
Joined: Apr 2004
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i originally installed my dv in normal position (oem bosch sport 110 bpv)
but when i logged my car channel 115 i noticed my requested boost was above my actual boost. i decided to invert my dv and once i did that my actual pulled above requested (i now peak at 20 psi after you perform mbar/psi conversion). graphs below demonstrate the before and after of the dv inverted. entirly you opinion but either way you will be ok when with diaphram. it's all in what you feel works better for your system. all dv/bpv's don't necessarily work better inverted though. when it is inverted you will noticed it sounds a little louder (id say more like an anoying bov) but at least its doing its job.
normal
<img src="http://images9.fotki.com/v178/photos/3/312468/2144665/normal1-vi.jpg">
<img src="http://images9.fotki.com/v173/photos/3/312468/2144665/normal2-vi.jpg">
inverted
<img src="http://images7.fotki.com/v150/photos/3/312468/2144665/inverted1-vi.jpg">
<img src="http://images9.fotki.com/v171/photos/3/312468/2144665/inverted2-vi.jpg">
i'd say the proof is in the pudding... wouldn't you?
normal
<img src="http://images9.fotki.com/v178/photos/3/312468/2144665/normal1-vi.jpg">
<img src="http://images9.fotki.com/v173/photos/3/312468/2144665/normal2-vi.jpg">
inverted
<img src="http://images7.fotki.com/v150/photos/3/312468/2144665/inverted1-vi.jpg">
<img src="http://images9.fotki.com/v171/photos/3/312468/2144665/inverted2-vi.jpg">
i'd say the proof is in the pudding... wouldn't you?
AudiWorld Super User
Joined: Apr 2004
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its a full duplex system believe it or not
airflow will work in both directions. i thought the same thing you mentioned but then i decided to log and try it anyways. although it sounds strange the diaphram tends to allow for greater boost inverted. TJM actually recommends the DV be inverted on majority of their modified cars.
AudiWorld Super User
Joined: Apr 2004
Posts: 8,322
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just like to note that curve looks lil better in first two because my passenger controlled vag-tool
the latter two were done by me while driving so the rpms are a little different. either way the numbers dont lie.
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AudiWorld Super User
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certainly worth a try
i mean leave the belly pan off the car after you install your new one. once you have the new screw adjustable hose clamps on u can put the car on ramps and switch the hoses and dv ends in matter of two minutes. you will be able to feel the car change in throttle response i'm sure.