Underbody Panel Effectiveness...
 

Hi everyone. Happy Easter! I'm new to the forum here, and new to these cars. I was wondering if anyone has done a full underbody panel kit with diffuser with a stock (height) suspension? Do they have a noticeable effect with that height? I know that an underbody kit works better the lower the car is, but for a DD I don't think I want to go that low. To back up, my last car was a '99 Prelude SH on Tein coilovers and was set to have about 3" clearance to the lowest point. The car looked cool, but it has its draw-backs. #1 I scrapped the ground a lot (of course), #2 I couldn't go through a car wash because I would bottom out on the guide rail. My plans for my FR-S is to do a full underbody kit to increase the downforce at interstate speeds, but I still want to go through the wash and I dont want to destroy the $600 diffuser every time I back out of my driveway. Has anyone done these aero mods with a stock height? Thanks everyone

Not stock height but was on STi springs (only 10mm drop) with my diffuser/suspension covers/unbody panels, I never scraped the diffuser. You should be totally fine.

Also you won't be adding downforce but rather reducing lift and drag.

https://uploads.tapatalk-cdn.com/202...3a61bddb97.jpg


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Smoothing the air below and lowering pressure underneath the car, maybe? :iono:

Does our "sports" car generate enough momentum to kick-start underbody aero-shenanigans?

All the info:

https://www.verus-engineering.com/informative-packets

Oh dang. According to those CP charts, yeah, lowering pressure underneath definitely does help. :w00t:

It is also quite efficient.

That's good to know. I would hate to damage such a pretty piece like a diffuser. I might get a set of TRD springs at some point, they have a 1" drop. That can't be any worse than the Prelude lol. Thanks

That's awesome. Thanks

I know I'm not going to get F1 effects here. Those panels start working right about where I'm having troubles, so every bit will help. I have an Electro-Mechanical degree, not Aeronautical.

1" drop is pretty mild, you should be okay everywhere but the steepest driveway entrances/exits. I'm at around -2.5" right now with a splitter and diffuser and as long as I am paying attention, I don't scrap.

Aero engineer here. For sure way way less effective at stock ride height. If you look at the Ventus stuff you see their model is slammed. Also, the application is for cruising at freeway speeds? A smidge more downforce/less lift is going to make no real difference for you. If you want it for looks that's fine. But it's not going to be doing anything useful for you, I don't think...

I am starting to get all the pieces for a flat bottom why because racecar. So far I have the following

Splitter up front
OEM Under Panels
Verus Trans Tunnel and rear Suspension covers

Just need the diffuser and diff cover :)