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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Mar-13-2019, 04:39:19 PM   #1
GrendelsbaneM3
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Default AGTStyling rear under diffuser question

For anybody who has one of these diffusers do you notice more downforce in the rear? Is it functional or purely for looks? Also, do the fins ever scrape?

Thanks!
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Old Wed, Mar-13-2019, 05:27:37 PM   #2
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Default Re: AGTStyling rear under diffuser question

LOL

It's for looks man.
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Old Wed, Mar-13-2019, 05:42:19 PM   #3
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Default Re: AGTStyling rear under diffuser question

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Originally Posted by GrendelsbaneM3 View Post
For anybody who has one of these diffusers do you notice more downforce in the rear? Is it functional or purely for looks? Also, do the fins ever scrape?

Thanks!
It might work, however, to for it have a chance it needs the floor in front of it to be slick.

In this shot you can see there's not a whole lot of air that is being directed under the car to it. So no, it really does nothing, but it is a interesting looking piece.


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Old Wed, Mar-13-2019, 06:50:22 PM   #4
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Default Re: AGTStyling rear under diffuser question

That is what I thought. I just thought it would lessen the air being caught up in the space behind the rear CSL diffuser. I have seen people take them off for the track or cut slits in them to, I assume to let air flow out.
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Old Thu, Mar-14-2019, 04:44:46 AM   #5
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Default Re: AGTStyling rear under diffuser question

I recently picked up a front lip from AGT and it came in a timely fashion and packed very nicely/safely. I was happy with the product upon opening the package
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Old Thu, Mar-14-2019, 05:02:58 AM   #6
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Default Re: AGTStyling rear under diffuser question

it will be fully functional if you can make everything up front of it flat. by itself it doesn't do much, it still adds a bit of downforce but nothing you can feel.
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Old Wed, Jun-12-2019, 03:33:32 PM   #7
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Default Re: AGTStyling rear under diffuser question

Does anyone have any idea if this has a negative effect on airflow? At the very least, it's already unnecessary added weight.
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Old Wed, Jun-12-2019, 05:50:33 PM   #8
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Default Re: AGTStyling rear under diffuser question

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Does anyone have any idea if this has a negative effect on airflow? At the very least, it's already unnecessary added weight.
You’ll only get speculations and race car bro-science answers here. Big name performance shops don’t have access to wind tunnels etc, let alone random dudes on car forum. Buy it if you like how it looks.
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Old Wed, Jun-12-2019, 06:11:32 PM   #9
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Default Re: AGTStyling rear under diffuser question

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Youíll only get speculations and race car bro-science answers here. Big name performance shops donít have access to wind tunnels etc, let alone random dudes on car forum. Buy it if you like how it looks.
there's already a video on youtube about this. granted its on a Miata model but they compared just a rear diffuser vs a diffuser w/ complete flat bottom. the diffuser did add downforce but nothing significant while having the bottom completely flat and channel the air thru the diffuser it adds quite a lot of downforce. just google it I guess.
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Old Wed, Jun-12-2019, 06:28:23 PM   #10
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Default Re: AGTStyling rear under diffuser question

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there's already a video on youtube about this. granted its on a Miata model but they compared just a rear diffuser vs a diffuser w/ complete flat bottom. the diffuser did add downforce but nothing significant while having the bottom completely flat and channel the air thru the diffuser it adds quite a lot of downforce. just google it I guess.
Iím not denying a rear diffuser can add downforce. The AGT is a tweaked replica of the varis. It was designed/molded in some guyís garage overseas (initially). The Miata, with whatever diffuser they used isnít an m3 or agt diffuser. Too many variables/differences. Unless all diffusers with flat bottoms provide proper downforce for any car.

Not saying agt does or doesnít, but itís all bro-science until proven properly.
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Discussing AGTStyling rear under diffuser question in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)