Sneed4Speed Aero Experience Anyone?

[DRLane]

Anyone have any experience with their wing & splitter. Claiming over 400lbs of downforce on a 63" 3D wing, and 3" splitter. Seems like a well balanced and purposeful aero package and they have access to a wind tunnel.

[dparm]

Sneedposting time.

[DRLane]

Originally Posted by dparm

Sneedposting time.

Did I miss a prior discussion?

[roastbeef]

it doesn't look terrible, but i'm a little skeptical of the "400lbs of downforce" claim. its not chassi mounted and the stanchions only mount to the plastic bumper. you're also loosing a significant amount in the gap it creates in the lower curves of the bumper.

[DRLane]

Originally Posted by roastbeef

it doesn't look terrible, but i'm a little skeptical of the "400lbs of downforce" claim. its not chassi mounted and the stanchions only mount to the plastic bumper. you're also loosing a significant amount in the gap it creates in the lower curves of the bumper.

I sent them an email about the efficacy given the gap, and to get more specs on the wing to compare to APR. I'd assume most of the referenced downforce is generated at the rear?

The splitter bolts quite far down to the aluminum engine shield cover and replaces the under tray. While not chassis mounted my Mporium under tray is pretty rigid / secure. I'd imagine all those bolts are more than sufficient to effectively support the generated downforce?

[roastbeef]

those gaps are what i dislike the most. once you lose the seal that the undertray provides, you introduce pressure behind the front bumper and i feel like you would lose some efficiency of the oil cooler and main cooling system.

when i had my apr front splitter, i went through the front bumper for supports and used large washers to spread the load, and they were mounted in the direction of the pull, rather than the 90* mount on the front face of the bumper.
the problem i had was my flat apr was a similar design, and i was running an older oem undertray. once the undertray was just a little compromised, the air pressure between the splitter and the bumper took care of the rest and destroyed it completely. after this, i've been pretty mindful of the gap.
i'm running a cheap gt4 splitter without any brake ducting until i return to optimize the front aero of this car again.
i'm probably not going to run a gt4 style lip, but instead run a gts style lip that seals the gap and construct some kind of 911 style scoops for front brake cooling.

[b4hand]

Originally Posted by roastbeef

it doesn't look terrible, but i'm a little skeptical of the "400lbs of downforce" claim. its not chassi mounted and the stanchions only mount to the plastic bumper. you're also loosing a significant amount in the gap it creates in the lower curves of the bumper.

Air is a fluid though, it should get pushed up by the splitter and then through the holes in the bumper. I doubt the little gap will be a problem, but I am not an engineer in that sense

[roastbeef]

Originally Posted by b4hand

Air is a fluid though, it should get pushed up by the splitter and then through the holes in the bumper. I doubt the little gap will be a problem, but I am not an engineer in that sense

its relative, i suppose. this becomes hair-splitting and nit-picky... if i could chose not to have the gaps- i would chose to not have them.

[DRLane]

Originally Posted by roastbeef

its relative, i suppose. this becomes hair-splitting and nit-picky... if i could chose not to have the gaps- i would chose to not have them.

Agreed! I think a lip or brake duct solves that.

[roastbeef]

like it even matters with the couple of track days i'm able to go to these days. lol

[DRLane]

Originally Posted by roastbeef

like it even matters with the couple of track days i'm able to go to these days. lol

Well on the bright side, those holes shave weight. So should save you a couple $$$ on titanium.

Yeah, the build obsession is hilarious 🤣.

[tsk94]

Majority of that downforce claim, regardless of it's accuracy, comes from the rear wing. A splitter that size contributes little to that total claimed amount.

And it sure ain't worth 700$ LOL

[DRLane]

Originally Posted by tsk94

Majority of that downforce claim, regardless of it's accuracy, comes from the rear wing. A splitter that size contributes little to that total claimed amount.

And it sure ain't worth 700$ LOL

Thanks, and to your E92. It's my favorite build on the forum.

[tsk94]

Originally Posted by DRLane

Thanks, and to your E92. It's my favorite build on the forum.

Thank you!

[Bartledoo]

Pass. Weaksauce for that amount of cash. The splitter doesn't even have tunnels. What self-respecting shadetree aerodynamicist builds a splitter without tunnels these days??

Also, without a lip to act as an air dam at the leading edge of the bumper your highest pressure region (where the air meets the surface which stops it) moves back into the gaps and to put it simply - it pushes up on the bumper and down on the splitter. So the highest pressure region effectively cancels itself out in terms of vertical force. You want to keep the high pressure region out on the splitter where there is only open air above it, thus giving you downward force and no upward force.

[DRLane]

Everyone seems fixated on the splitter. Sounds like it's a unanimous PASS.

What about the wing?

[tsk94]

Wing looks, alright?

However, I believe APR and BimmerWorld both offer much better options. For a more economical option, that would still be better than this sneed wing, is the 'Big Wang' E92 M3 rear wing. Cheap, roof height and proven to work well.

Any roof height wing will be much much more effective than lower height wings like this sneed one.

[tsk94]

3D wings are (typically) more effective and utilized for wings below roof line. Above, or equal to roof height, a traditional 2D wing is more effective. Hence why you see almost all roof height wing options from BW, APR, Big Wang, etc. being 2D design, and below roof line options like some APR and this sneed option being 3D.

A roof height 2D wing will generate MUCH more downforce than a below roof line 3D wing, and typically produces less drag as well. Since you can run a much less aggressive AOA and produce the same (and typically more downforce) with a lower drag penalty. Basically, a roof height 2D wing is much more efficient at producing downforce than any below roof height 3D wing.