 Debating - under car air deflector, Debating to use or not use on my E-Prod car |
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| FastFroggy |
 May 18 2026, 10:19 AM
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#1
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Member  Group: Members Posts: 78 Joined: 27-November 15 From: South East MI Member No.: 19,415 Region Association: Upper MidWest  |
I am prepping for next weekends event and was wondering what the group knowledge in on these undercar air deflectors that go just in front of the engine on the bottom side of the floor pan.
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| Ninja |
May 18 2026, 10:32 AM
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#2
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Member Group: Members Posts: 213 Joined: 25-September 25 From: Granbury Texas Member No.: 29,004 Region Association: Southwest Region |
It should create a slightly lower pressure zone under the engine that should slightly increase engine cooling.
I would use them. |
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| brant |
May 18 2026, 01:39 PM
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#3
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914 Wizard Group: Members Posts: 12,192 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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Hypothetically help
I use them Have never tested |
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| mskala |
May 18 2026, 02:19 PM
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#4
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R Group: Members Posts: 1,949 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None
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I did some experiments on my 6-cyl several years ago and found that they help with
lowering the oil temp. Not proof for the 4-cyl but hey the factory added them. It is a very cheap thing to do if it doesn't do any harm. |
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| FastFroggy |
May 18 2026, 03:31 PM
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#5
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Member Group: Members Posts: 78 Joined: 27-November 15 From: South East MI Member No.: 19,415 Region Association: Upper MidWest |
Engine cooling makes sense.... Being I'm gerbil powered compared to those in my class, wondering if there is any drag impact?
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| GregAmy |
May 18 2026, 05:29 PM
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#6
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Advanced Member Group: Members Posts: 2,661 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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Worried about additional drag? I sincerely doubt they create much...I use 'em in my 2L IT-prep historics car even though I have no engine tin surrounds.
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| FastFroggy |
May 19 2026, 08:40 AM
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#7
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Member Group: Members Posts: 78 Joined: 27-November 15 From: South East MI Member No.: 19,415 Region Association: Upper MidWest |
Well that is good enough for me. Appreciate it.
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