why not?

[s2carlo]

I have mounted a cone-filter directly on to the MAF.
However now it's pointing backwards and there is a large possibility of heatsoak.
I would like to make it point forward.

Dahlback has a beautifull 180 degree curve for it (very expensive)
Some use a hose, easy but mostly no smooth surface giving turbulance.
Some use piping, that's heavy.

Why not use PVC piping? It light, smooth surface, all kinds of joints, easy to modify if needed, bad heat conductor?

Any reasons why this is not used??

Thanks
Carlo

[s2driveruk]

I'd be very interested in what you manage to find as mine is the same at the moment and I am not happy with the location but I haven't found a decent solution to change the location so that it looks forward ..

David

[s2carlo]

Well, as no one seems to have an opion or experience I descided to try it.
Untill now it work perfectly.
I used 2 PVC 90 degree bents, diameter 75mm, and some connection material

The pipes stay nice and cool, even after a firm drive.
The suction- and blow-off sounds are nice.
It is a low cost solution (25 euro excl. the filter)

The filter I am using also has "suctionarea"on the inside. I also have tubing to bring cool air from under the bumper strait into the filter which creates a kind of ram-air intake.

Below some pictures of the current status

I have mounted a cone-filter directly on to the MAF.
However now it's pointing backwards and there is a large possibility of heatsoak.
I would like to make it point forward.

Dahlback has a beautifull 180 degree curve for it (very expensive)
Some use a hose, easy but mostly no smooth surface giving turbulance.
Some use piping, that's heavy.

Why not use PVC piping? It light, smooth surface, all kinds of joints, easy to modify if needed, bad heat conductor?

Any reasons why this is not used??

Thanks
Carlo

[s2carlo]

___

Well, as no one seems to have an opion or experience I descided to try it.
Untill now it work perfectly.
I used 2 PVC 90 degree bents, diameter 75mm, and some connection material

The pipes stay nice and cool, even after a firm drive.
The suction- and blow-off sounds are nice.
It is a low cost solution (25 euro excl. the filter)

The filter I am using also has "suctionarea"on the inside. I also have tubing to bring cool air from under the bumper strait into the filter which creates a kind of ram-air intake.

Below some pictures of the current status

[A6 AVANT]

Excellent!! looks like a few people making a trip to Travis Perkins for some black plastic drain pipe!!!

[Greg_S]

I had thought about doing something like that, wasnt sure how well it would work though.

Greg

[Sweeper]

s2carlo: excelent work ! basicly it look's the same as dahlback item apart that your shield is better. It covers maf and MAF-Turbo house that also need heat protection.

Once again great work.

P.S. Guys , why I'm having "brrr brrrr brrrr" noice coming from the filter box place after instaling the same system on gear changes and clutch pedal pushing as on the picture ? Any thought ?

[GandalfS6]

s2carlo: excelent work ! basicly it look's the same as dahlback item apart that your shield is better. It covers maf and MAF-Turbo house that also need heat protection.

Once again great work.

P.S. Guys , why I'm having "brrr brrrr brrrr" noice coming from the filter box place after instaling the same system on gear changes and clutch pedal pushing as on the picture ? Any thought ?

Sweeper - I wondered about the same noise with my cone filter , but I think I have figured it out. As you lift off the throttle, the DV releases boost into the MAF to Tubo hose. If there is a lot of air being released it would blow back through the filter. It is difficult for the air to blow back through a filter box but very easy with just a cone filter. With a stock filter box you would not hear the sound as much as with a cone filter. I get the idea that the cone filter almost amplifies the sound.

[GandalfS6]

PS Carlo - nice work!

[s2carlo]

I have the same sound.
It occurs if no longer power is requered. It's more clear if the turbopressure has been up and then dropped by the ECU.

It's one of the nice things of driving with a cone filter.
Outside you hear a whoooeeessshhh sound . People turn their heads on it on a regular basis.

From what I am told Gandalf is correct on his analyses about the cause of the sound.

Sweeper - I wondered about the same noise with my cone filter , but I think I have figured it out. As you lift off the throttle, the DV releases boost into the MAF to Tubo hose. If there is a lot of air being released it would blow back through the filter. It is difficult for the air to blow back through a filter box but very easy with just a cone filter. With a stock filter box you would not hear the sound as much as with a cone filter. I get the idea that the cone filter almost amplifies the sound.

[DAVIDP20V]

had a go with my car today, using the black pvc tubing, just got to make a heat shield, post pic 2mora.

sounds very nice

[horvathg]

s2carlo: excelent work ! basicly it look's the same as dahlback item apart that your shield is better. It covers maf and MAF-Turbo house that also need heat protection.

Once again great work.

P.S. Guys , why I'm having "brrr brrrr brrrr" noice coming from the filter box place after instaling the same system on gear changes and clutch pedal pushing as on the picture ? Any thought ?

Sweeper,

I had a similar noise, just to find that the dump valve was faulty. The forum suggested to swap for an S3 dv and its gone since.

[horvathg]

Sweeper,

I had a similar noise, just to find that the dump valve was faulty. The forum suggested to swap for an S3 dv and its gone since.

And lets distinguish the wsssshhhhhh sound of the healthy DV from the brlbrlbrl of the worn out one. The difference is clear once you've heard both.

[Billman]

Can someone post some wave files with these DV noises? Mine sounds like a Horse!!!

[Mihnea]

Great job Carlo, good to hear from you again

Mihnea