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Massius Massius is offline
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Default Done. cold air fender mod for relocated inlets - 04-02-2017, 12:36 PM

Couldn't find any info online about this so thought I would give it a try.

Note, replacement liner is around $15

used a 1 1/4 hole saw, no need to remove the liner and takes less than 10 minutes.

I plan on getting logs soon. hoping this helps to bring down IAT's







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ianc ianc is offline
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Default 04-02-2017, 09:26 PM

How are we feeling about the wheel throwing crap and muck through those holes onto the filters in bad weather? Maybe a baffle that would still let cold air through but shield the filters a little?

ianc
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Massius Massius is offline
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Default 04-03-2017, 07:52 AM

I could imagine bad weather driving is a legitimate concern for many. In my case this car is a weekend driver and never sees bad weather. I would suggest this is kept to cars in dry areas, track only, Sunday drivers etc.
Another note, the location of these vents are not directly over the tire. one would have to be making a good left turn for the tire to be directly under the vents. even then. My oil cooler has no muck build up and it is directly in the line of fire of my tire.
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Default 04-03-2017, 07:58 AM

Let us know how the logs look!


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Default 04-03-2017, 08:25 AM

Hmm would that area of the wheel well be a low pressure spot? You might end up sucking air out of the engine bay from there. What you really need is a mirrored version of the snorkel that dumps air to that side.
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Default 04-03-2017, 11:53 AM

I don't see this having any effect on IATs whatsoever. As Terry has posted in the DCI intake thread, on a turbo motor, the temperature of incoming area isn't really that important. Its still gotta be compressed, which raises the temperature, and go through the intercooler, which lowers it. If you're looking to lower the IATs, the intercooler is where I'd be looking.


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ShocknAwe ShocknAwe is offline
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Default 04-03-2017, 01:51 PM

Pretty sure that's a low pressure opening there, which means all you're effectively doing is warming one of your front tires more than the other.


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Massius Massius is offline
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Default 04-03-2017, 05:29 PM

Just got logs. I'll post up the results when I get home in an hour or so
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xQx xQx is offline
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Default 04-03-2017, 06:17 PM

In all seriousness, why doesn't anyone make bonnet scoop CAI's for our cars?

It seems to me the shortest intake route would be to either have a Subaru style bonnet scoop to feed either a hot-side or stock-location airbox.

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Massius Massius is offline
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Default 04-03-2017, 06:34 PM

N54 Mods
No cats dwnp
relocated inlets
Charge pipe
Tial
Jb4 map2
BEF
93 Oct

Stock fmic and ctback

Results

rolling pulls from 3rd through 4th

Ambient temp 65*

Vents blocked off:
first run- 3rd gear 3000 rpm, iat 73* / 4th gear 5000 rpm, iat 128*, Difference 56*

heat soaked run 3rd gear 3000 rpm iat 83* / 4th gear 5000 rpm, iat 143*, Difference 60*

2nd Heat soaked run- 3rd gear 3000 rpm, iat 85* / 4th gear 5000 rpm, iat 150*, Difference 65*
__________________________________________________ ____

Let the car cool. Warmer outside now. Ambient temp 74*

Vents Open:
first run- 3rd gear 3000 rpm, iat 87* / 4th gear 4300 rpm, iat 140*, Difference 53*

Heat soaked run- 3rd gear 3000 rpm, iat 96* / 4th gear 5000 rpm, iat 127*, Difference 31*

2nd Heat soaked run- 3rd gear 3000 rpm, iat 102* / 4th gear 5000 rpm, iat 145*, Difference 43*

Last edited by Massius; 04-03-2017 at 08:27 PM..
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Default 04-04-2017, 09:49 AM

Props for getting with/without comparison logs.

The first runs - with no heatsoak, the difference in IAT is 3*, or negligible.

On the heat soak runs, my guess is the vents are extracting heat from the engine bay quicker (not flowing in cool air to filters), which is helping.

Gotta say, it appears to help.


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Default 04-04-2017, 10:33 AM

Did anyone ever do a similar test with the cowl removed or with a vented hood?
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Default 04-04-2017, 01:08 PM

I highly doubt that would be effective:
-wheel well is low pressure
-air in wheel well is hot from brakes and air leaving the oil cooler
Additionally, I dislike the thought of the filters being splashed buy filty water picked up by the steer tire.
Also, cold water spalshing the hot turbos.
What you need is ram air ducts from 330d
Snorkel is on the right and will guide cool air towards the air filter on the inlets.
Take a look:
Attached Images
  
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Massius Massius is offline
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Default 04-04-2017, 01:56 PM

Quote:
Originally Posted by vwetish
I highly doubt that would be effective:
-wheel well is low pressure
-air in wheel well is hot from brakes and air leaving the oil cooler
Additionally, I dislike the thought of the filters being splashed buy filty water picked up by the steer tire.
Also, cold water spalshing the hot turbos.
What you need is ram air ducts from 330d
Snorkel is on the right and will guide cool air towards the air filter on the inlets.
Take a look:
Low pressure or not its made a difference. I like your 330d idea though. i would like to give that a try.

Also, if i can somehow get so much water that i get the turbos wet, I would be in for a world of other issues.

It looks like ill have a chance to drive in the rain this week. considering just seeing what happens. would be fun to jam my gopro in there
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Default 04-08-2017, 06:55 AM

I like innovation, so I give you credit for stepping outside the box and giving it a shot. There's nothing scary here, nothing crazy, but makes sense. And hell, it's your car...do what you feel comfortable with doing, you know? If you don't like it, it'll cost $15 to return to stock -- that's cheap.

// Radar //

P.s.
If some of the things the guys brought up are actually a factor, I could picture riveting a "reverse scoop" (opening toward the rear) onto the area of holes. Or forward, you could try it both ways before making permanent.
If it is a low pressure vacuum then the scoop might even amplify that pulling effect. It could be made from aluminum or Kydex .060, either would be cheap and easy to fab.


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Last edited by RadarContact; 04-09-2017 at 02:44 PM..
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JBacon335 JBacon335 is offline
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Default 05-02-2017, 05:14 AM

I really wish I could see the pictures in the original post to see if I want to mimic this
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rkreimer10 rkreimer10 is offline
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Default 05-04-2017, 10:56 PM

Would the passenger side air ducting for the M version of your car? It does for the 5 series.
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Default . - 05-05-2017, 04:04 AM

Quote:
Originally Posted by JBacon335
I really wish I could see the pictures in the original post to see if I want to mimic this
just in case you didnt get my pm

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JBacon335 JBacon335 is offline
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Default 05-05-2017, 04:10 AM

In case you didn't get the pm
Sounds fun to me, you're going to regret it. I'm in Toms River NJ. I'm out of work at 3, I'll be ready to square up immediately. Don't bitch out now
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bNks334 bNks334 is offline
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Default 08-12-2017, 10:15 AM

Quote:
Originally Posted by xQx
In all seriousness, why doesn't anyone make bonnet scoop CAI's for our cars?

It seems to me the shortest intake route would be to either have a Subaru style bonnet scoop to feed either a hot-side or stock-location airbox.

If I ever do a carbon fiber hood I'll be modifying it with a scoop to feed a relocated intake. A lot of these other gimicky things people are doing aren't going to have any measurable impact.

Terry trying to convince people inlet air temps don't matter so they keep buying his open element filters is just plain stupid.

Last edited by bNks334; 08-12-2017 at 10:26 AM..
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