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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 05-09-2013, 11:10 AM   #21
SamDoe1
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Originally Posted by sm240 View Post
I am amazed at the amount of members that don't know what they are talking about and yet argue against factual sciences. If you don't know what your talking about, why is it so hard to look at another perspective? Possibly one that makes sense? Not that because I did it, so it's ok. Fact is this particular question has been asked a few times recently. Because of the ducting the car has, it still receives fantastic airflow. What doesn't happen is the addition cooling of the engine by funneling air out past the oil pan. Instead airflow terminated before it hits the fan and just swirls around. Thus is why you get dirt in there. Additional the fan is really not working at all, due to the fact it's pulling cold air from the bottom instead of hot air off the radiator. But hey the car doesn't over heat, so who cares right. Cause the same guys who made my moms Buick used the same engineering here. So flame away with some idiotic perspectives... Seems to be a theme
wat? We don't leave the covers on for air flow reasons, we leave them on for the sake of keeping sh!t out of our engine bay. That's the whole reason they are there to begin with.

Also, if you think that driving with the belly pan off is providing a measurable cooling benefit, you are very wrong because your car isn't air cooled, it's water cooled. So no matter how much cooling air you wrap around your engine, it isn't designed to be cooled with that medium therefore making it worthless.. The fan doesn't work when you're driving anyway because the air is forced into the radiator.

Source: My knowledge of the subject.
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Old 05-09-2013, 12:55 PM   #22
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Ditch the plastic skid plates?

You are right about the fan though, still doesn't work at a stop which is how it's designed. It's not pulling air from the rad, but everywhere else in the bay. What else


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Old 05-09-2013, 12:57 PM   #23
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Removing the shielding is probably going to reduce your fuel economy. I believe that is why BMW put them there.
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Old 05-09-2013, 12:58 PM   #24
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Bottom line: If the shielding didn't serve a beneficial purpose, BMW could have saved a $hit ton of $$$ by omitting them.
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Old 05-09-2013, 01:07 PM   #25
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Ditch the plastic skid plates?

A shop took mine off and left it off before I could do oil changes. Those assholes!


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Old 05-09-2013, 02:21 PM   #26
SamDoe1
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Put a fan on a table in your house. Does it still blow air? Same thing.

Your hood isn't air tight and neither are the belly pan pieces, they vent heat and air all around.

Thread you listed says the same thing that people are saying here.

Last edited by SamDoe1; 05-09-2013 at 02:24 PM.
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Old 05-09-2013, 02:38 PM   #27
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Everyone knows that normal rules don't apply to Audis. They exist in a different dimension called the suckaverse.
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Old 05-09-2013, 03:30 PM   #28
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Ditch the plastic skid plates?

I've helped design splitter elements for road race cars. Im no engineer, however I've studied and applied this to my own car and others. Extreme versions of current manufacturer implemented designs. I've said it before, look at how a front splitter works and the principle is damn near the same... K I'm really gonna be quiet now


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Old 05-09-2013, 07:29 PM   #29
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I've helped design splitter elements for road race cars. Im no engineer, however I've studied and applied this to my own car and others. Extreme versions of current manufacturer implemented designs. I've said it before, look at how a front splitter works and the principle is damn near the same... K I'm really gonna be quiet now


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Believe it when I see it.
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Old 05-10-2013, 01:28 AM   #30
SamDoe1
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Ditch the plastic skid plates?

Quote:
Originally Posted by sm240 View Post
I've helped design splitter elements for road race cars. Im no engineer, however I've studied and applied this to my own car and others. Extreme versions of current manufacturer implemented designs. I've said it before, look at how a front splitter works and the principle is damn near the same... K I'm really gonna be quiet now


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Lulz roflcopter.

Front splitter =/= radiator fan/engine bay/underbody panel/whatever else you've said in this thread.

I just happen to be an engineer and more specifically one who specializes in aerodynamics and fluid mechanics so I'm going to go ahead and call BS.

Leave the shields on or take them off its up to you. Who ever said the best and worst case scenarios was absolutely right. Carry on.


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Old 05-10-2013, 02:28 PM   #31
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driven with it on and off (laziness after an oil change lolz) and i can attest that having the pan on is beneficial to aerodynamics and also has nothing to do with cooling. driving with the pan off is kinda like driving with the windows open, if you are in tune with your car you will notice a difference
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Old 02-19-2014, 09:46 AM   #32
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Any idea where can i get tis plates for cheep and what is the actual name for this?
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Old 02-19-2014, 02:17 PM   #33
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^ ebay or junk yard. You might be able to scrounge some up on here from other members.
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Old 02-19-2014, 05:01 PM   #34
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I would think they add to high speed stability... For those time your are driving over 110 or so... But I'd leave them on to protect the alternator from water...
I think is for the underneath aerodynamics of the car to limit the air passing through the engine compartment. The high performance cars their underneath have been covered.
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Old 02-19-2014, 05:18 PM   #35
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They are for noise reduction and keeping sh!t out of your engine bay. Your 225hp E46 does not need any underbody aero elements as it will never reach a speed that would require them. Anyone who thinks otherwise needs to take a class or ten in aerodynamics.

Last edited by SamDoe1; 02-19-2014 at 05:25 PM.
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Old 02-19-2014, 05:36 PM   #36
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After 2 winters of cracked underbody shields I put away the front 2 shields for the winter. I had to buy new.
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Old 02-19-2014, 05:40 PM   #37
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They are for noise reduction and keeping sh!t out of your engine bay. Your 225hp E46 does not need any underbody aero elements as it will never reach a speed that would require them. Anyone who thinks otherwise needs to take a class or ten in aerodynamics.

If you've actually taken a class in aerodynamics (which I assume you haven't based on your statement) you'd understand that underbody panels are there to reduce drag. Which returns better gas mileage.
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Old 02-19-2014, 05:53 PM   #38
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If you've actually taken a class in aerodynamics (which I assume you haven't based on your statement) you'd understand that underbody panels are there to reduce drag. Which returns better gas mileage.
Second the motion!!!!!!! Good work peytonracer4.
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Old 02-19-2014, 06:07 PM   #39
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Here's the dope... If they are on and work... Leave them on!

If they are broke (and so are you)... Leave them off!
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Old 02-19-2014, 06:16 PM   #40
alika808
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Any idea where can i get tis plates for cheep and what is the actual name for this?
Check this site, item #26 Front aggregate protective plate

http://bmwfans.info/parts-catalog/E4...nd_insulation/

Check with ebay selling for $100.00+
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