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      10-29-2013, 01:48 PM   #1
Singh97
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Question Front bumper side grills on 35i vs 50i !!

Hi, I know that on a 35i side grills under the fog lights are not vented/meshed like 50i but are only designed to like a perforated one. So my question is has anybody swapped them and also is there a reason other than looks to weather this should be done or not. Please share all pros and cons you can think of. Pictures are welcomed if you have done this mod.

Another forum member Neon01 asked me this question.
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      10-30-2013, 07:50 AM   #2
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I have the m sport and I changed the solid ones to mess! The only reason the 50 has them open is because of the intercoolers !
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      10-30-2013, 11:15 AM   #3
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I believe mpg will suffer.
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      10-30-2013, 11:24 AM   #4
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Did u noticed some extra dirt accumulating inside the bumper or any other difference?

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I have the m sport and I changed the solid ones to mess! The only reason the 50 has them open is because of the intercoolers !
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      10-30-2013, 11:25 AM   #5
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can u please expand on that ?

QUOTE=edennelson;14896554]I believe mpg will suffer.[/quote]
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      10-30-2013, 11:49 AM   #6
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Quote:
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can u please expand on that ?

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I believe mpg will suffer.
By drawing air into the front of the vehicle you increase the drag coefficient.
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      10-30-2013, 11:56 AM   #7
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Quote:
Originally Posted by Singh97
Did u noticed some extra dirt accumulating inside the bumper or any other difference?

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Originally Posted by Chio View Post
I have the m sport and I changed the solid ones to mess! The only reason the 50 has them open is because of the intercoolers !
Nah no dirt theres a slot under the intercoolers that goes out under the car so basically its just a vent but no dirt stays behind. Only problem i have is the leafs going into the center mesh of the bumper And have to stick a vacum hose thur the hood where the kidneys go to vac.
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      10-30-2013, 12:47 PM   #8
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Thanks. But I was more concerned about the after affects of changing the grills to open meshed once on a 35i. As you said 50i have inter-coolers so there is no much open space there.

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Nah no dirt theres a slot under the intercoolers that goes out under the car so basically its just a vent but no dirt stays behind. Only problem i have is the leafs going into the center mesh of the bumper And have to stick a vacum hose thur the hood where the kidneys go to vac.
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      10-30-2013, 12:49 PM   #9
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Will it add even more air from the side grills even after having that big center grill and big kidneys?


Quote:
Originally Posted by edennelson View Post
By drawing air into the front of the vehicle you increase the drag coefficient.
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      10-30-2013, 12:53 PM   #10
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Quote:
Originally Posted by Singh97
Thanks. But I was more concerned about the after affects of changing the grills to open meshed once on a 35i. As you said 50i have inter-coolers so there is no much open space there.

Quote:
Originally Posted by 1FASTX5 View Post
Nah no dirt theres a slot under the intercoolers that goes out under the car so basically its just a vent but no dirt stays behind. Only problem i have is the leafs going into the center mesh of the bumper And have to stick a vacum hose thur the hood where the kidneys go to vac.
Since we have the intercoolers, whats behind yours have u checked. Take a look before buying them to see whats gonna be exposed. Sometimes you might see something that dont look good being exposed
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      10-30-2013, 02:54 PM   #11
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Quote:
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Will it add even more air from the side grills even after having that big center grill and big kidneys?
Yes it will reduce mpg. I can't say by how much, it's defiantly not huge.
It's probably similar to having a dirty air filter, or a couple PSI low in your tires.
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      10-31-2013, 02:31 PM   #12
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It will not do anything to mpg! When they were blocked it was like hitting a wall! Now they are open and the air can flow threw !
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      10-31-2013, 02:36 PM   #13
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The air will just go in then down and out! I have been getting same mpg since I have done this both city and hwy
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      10-31-2013, 03:25 PM   #14
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Quote:
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It will not do anything to mpg! When they were blocked it was like hitting a wall! Now they are open and the air can flow threw !
People think removing the tail gate from their pickup allows air to flow threw...
It in fact creates a low pressure area behind the cab and causes mpg to suffer.

The OP asked for downside. The downside is a small decrease in mpg.

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      11-01-2013, 08:10 AM   #15
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agree the sealed mesh looks terrible. though adding vents with no intercoolers seems korny to me. no way that would impact MPG...thats retarded.
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      11-01-2013, 11:22 AM   #16
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Thank you for the pictures Chio.

Quote:
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The air will just go in then down and out! I have been getting same mpg since I have done this both city and hwy
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      11-01-2013, 11:34 AM   #17
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Quote:
Originally Posted by edennelson View Post
People think removing the tail gate from their pickup allows air to flow threw...
It in fact creates a low pressure area behind the cab and causes mpg to suffer.

The OP asked for downside. The downside is a small decrease in mpg.

As an aerospace engineer I understand what you're trying to post, however, what's uncertain in this case is whether or not the volume of space behind those grilles is sealed or vented. If it _does_ vent to somewhere, it's unlikely that this will significantly impact the overall drag of the vehicle.

I think you would have a stronger case if the closed grilles were a part of some laminar or turbulent low pressure region (such as in your pickup truck analogy) that would be disturbed if they were gone. As it is, they are completely within the free stream airflow, and probably creating a high pressure region (due to being almost completely oblique to the vehicle velocity vector) anyway, so I'm not sure if creating a hole there will really change the flow over the vehicle much. It will divert less flow over the rest of the front of the vehicle. If that is beneficial or not is unknown.

One thing is certain - unless the x50i has these regions ducted somehow and the x35i does not, it will certainly create a situation no worse than the one on the x50i. Though there are heat exchangers in those locations on the x50i, the air still flows over those and has to go somewhere.

When I asked Singh, part of what I was inquiring if anyone had actually done it before since I simply don't know what's behind there. If there are large chunks of white styrofoam supporting that region of the bumper, for example, I certainly wouldn't want that visible. Also, whether those areas on the x35i or x50i are actually ducted or vented somehow.
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      11-09-2013, 09:50 PM   #18
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Quote:
Originally Posted by Neon01 View Post
As an aerospace engineer I understand what you're trying to post, however, what's uncertain in this case is whether or not the volume of space behind those grilles is sealed or vented. If it _does_ vent to somewhere, it's unlikely that this will significantly impact the overall drag of the vehicle.

I think you would have a stronger case if the closed grilles were a part of some laminar or turbulent low pressure region (such as in your pickup truck analogy) that would be disturbed if they were gone. As it is, they are completely within the free stream airflow, and probably creating a high pressure region (due to being almost completely oblique to the vehicle velocity vector) anyway, so I'm not sure if creating a hole there will really change the flow over the vehicle much. It will divert less flow over the rest of the front of the vehicle. If that is beneficial or not is unknown.

One thing is certain - unless the x50i has these regions ducted somehow and the x35i does not, it will certainly create a situation no worse than the one on the x50i. Though there are heat exchangers in those locations on the x50i, the air still flows over those and has to go somewhere.

When I asked Singh, part of what I was inquiring if anyone had actually done it before since I simply don't know what's behind there. If there are large chunks of white styrofoam supporting that region of the bumper, for example, I certainly wouldn't want that visible. Also, whether those areas on the x35i or x50i are actually ducted or vented somehow.
I believe that on my 50i it vents the breaks
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