 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.
Thanks  |
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Replies(1 - 9)
| Ninja |
May 18 2026, 10:32 AM
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#2
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Member Group: Members Posts: 233 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: 12,224 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: 1,954 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: 2,682 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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| Shivers |
May 25 2026, 11:32 AM
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#8
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Senior Member Group: Members Posts: 3,466 Joined: 19-October 20 From: La Quinta, CA Member No.: 24,781 Region Association: Southern California |
QUOTE(FastFroggy @ May 18 2026, 09:19 AM)  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. Thanks Thanks for reminding me. Old brains.  |
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| Charles Freeborn |
May 26 2026, 08:54 PM
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#9
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Member Group: Members Posts: 342 Joined: 21-May 14 From: United States Member No.: 17,377 Region Association: Pacific Northwest |
My car wears 'em. I have no data one way or the other..
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| Thorshammer |
Jun 3 2026, 06:35 AM
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#10
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Senior Member Group: Members Posts: 756 Joined: 11-November 03 Member No.: 1,335 |
Yes,
I tested with and without the plastic pieces on my EP race car back in 2005. There should be a thread, there was on the club site. I also had a video posted somewhere from a go pro, and they move quite a bit. My car only had about 3.5 inches of ground clearance so they would drag on the ground. I did have a 15-20 degree CHT reduction, which I thought was amazing. |
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