|
Tracking / Autocross / HPDE / Drifting What these cars were built for! |
|
Thread Tools | Search this Thread |
08-28-2021, 05:54 PM | #1 |
Senior Member
Join Date: Dec 2018
Drives: 2013 frs base
Location: central Virginia
Posts: 1,115
Thanks: 1,729
Thanked 912 Times in 473 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
|
Functional aero mods
I'm thinking about adding a small front splitter (Devsport) which means I probably need to pair it with a smallish rear spoiler. I've already installed an underbody kit and fabricated a diffuser. My car is n/a, currently, with stock suspension. My goal is to improve aero without increasing drag.
Any suggestions on a spoiler? |
08-28-2021, 08:09 PM | #2 |
Senior Member
Join Date: Mar 2017
Drives: JRSC BRZ SOLD
Location: Ohio
Posts: 934
Thanks: 676
Thanked 739 Times in 396 Posts
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
|
Idk how functional the Devsport lip is as its not a full splitter at all. A rear spoiler isn't really needed to reduce drag, most won't. I'd consider both of them just cosmetic. The Verus ducktail has CFD data to validate any claims however, as does their splitter!
|
The Following User Says Thank You to PulsarBeeerz For This Useful Post: | blsfrs (08-29-2021) |
08-29-2021, 05:01 PM | #3 |
Senior Member
Join Date: Dec 2015
Drives: Track preped NA FRS
Location: Montreal, Canada
Posts: 987
Thanks: 1,056
Thanked 680 Times in 405 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
|
Dont get too hung up on reducing drag to the point where you are sacrificing downforce. Up to a certain point, more downforce is always good, that point isnt a small splitter and little lip on the trunk.
|
The Following 3 Users Say Thank You to Icecreamtruk For This Useful Post: |
08-30-2021, 06:13 PM | #4 |
Senior Member
Join Date: Jan 2014
Drives: BRZ
Location: Bay Area, CA
Posts: 197
Thanks: 104
Thanked 123 Times in 70 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
|
Are you just doing aero mods only for the sake of doing aero mods, or are you trying to achieve some sort of performance target/metric through only reducing drag? What's the end goal?
|
The Following User Says Thank You to AFRichZC6 For This Useful Post: | blsfrs (09-05-2021) |
08-31-2021, 09:02 AM | #5 | |
Senior Member
Join Date: Dec 2018
Drives: 2013 frs base
Location: central Virginia
Posts: 1,115
Thanks: 1,729
Thanked 912 Times in 473 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
|
Quote:
I am aiming for some drag reduction and maybe some increase in downforce. From what I have read, some mods can give you both. I realize that without wind tunnel or CFD testing there is no concrete way of knowing what combination of mods will make a change so I'm trying for an educated guess in a positive direction. |
|
09-04-2021, 03:19 AM | #6 | |
Senior Member
Join Date: Oct 2013
Drives: 2013 BRZ, 2023 Model 3
Location: SF Bay Area
Posts: 2,296
Thanks: 1,212
Thanked 863 Times in 570 Posts
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
|
Quote:
It sounds like you should get OEM underbody panels next if your car didn’t come with them. |
|
The Following 2 Users Say Thank You to norcalpb For This Useful Post: | blsfrs (09-05-2021), Yoshoobaroo (09-04-2021) |
09-04-2021, 08:28 AM | #7 | ||
TRACKBREAD
Join Date: Mar 2016
Drives: 2013 BRZ
Location: Florida
Posts: 3,929
Thanks: 2,660
Thanked 4,024 Times in 1,895 Posts
Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
|
Functional aero mods
Quote:
Reducing lift and increasing downforce is the same thing. You’re reducing the net lift achieved by the aerodynamic body. There’s no such thing as downforce in aero calcs. Just lift, be it positive or negative. A car still behaves largely like a simple airfoil. Whichever side (top or bottom) has the faster air speed will have less static pressure. If the static pressure on top is smaller than the bottom you get positive lift, if not you get negative lift. Following that, generally, drag reduction under the car decreases lift, drag reduction on the top of the car (hood,roof,trunk) increases lift. That’s why spoilers decrease lift, they increase the drag on top of the car. Quote:
|
||
The Following 4 Users Say Thank You to Yoshoobaroo For This Useful Post: |
09-04-2021, 01:38 PM | #8 | |
Senior Member
Join Date: Jan 2018
Drives: 2017 toyota 86
Location: PNW
Posts: 2,131
Thanks: 336
Thanked 1,188 Times in 781 Posts
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
|
Quote:
The TRD aero stabilizer would be a good addition to pair. Don’t expect a crazy noticeable difference, but both should help on paper. Rear spats would be good to pair with that diffuser Extending the diffuser under the car further/ connecting it to flat under panels ideally it would be one smooth connected transition from front splitter to rear diffuser. Verus wheel deflectors would help Trd fender fins add downforce similar to canards but also redirects air around the mirrors so the drag penalty is reduced. Side skirts can reduce lift while reducing drag as well. You said you have underpanels already? Have pics? |
|
09-05-2021, 10:55 AM | #9 | |
Senior Member
Join Date: Dec 2018
Drives: 2013 frs base
Location: central Virginia
Posts: 1,115
Thanks: 1,729
Thanked 912 Times in 473 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
|
Attachment 204980Attachment 204980
Quote:
I just got a used oem spoiler off of ebay. The underbody panels were my first aero mod. I do have panels between the floor and axles. A diffuser is ineffective without smooth air ahead of it. Getting the bottom of a car absolutely smooth is difficult and expensive but what I've got ain't too bad. I may fab up a removable diffuser extension. I didn't want it to extend too far out so I wouldn't nail my shins every time I went into the trunk. I'll look into your other suggestions. Thanks |
|
09-05-2021, 11:11 AM | #10 |
Senior Member
Join Date: Jan 2018
Drives: Crapcan
Location: Oregon
Posts: 11,163
Thanks: 18,156
Thanked 16,323 Times in 7,381 Posts
Mentioned: 107 Post(s)
Tagged: 0 Thread(s)
|
Side splitters/skirts my be a good option for you. They prevent "mixing" and allow the underbody to work more efficiently. I'd also look at items like the little TRD fender garnishes that look like they help manage the airflow from the wheel wells.
Are you building for a class or building for funzies?
__________________
"Experience is the hardest kind of teacher. It gives you the test first and the lesson afterward." -Oscar Wilde.
|
09-05-2021, 11:21 AM | #11 |
Senior Member
Join Date: Dec 2018
Drives: 2013 frs base
Location: central Virginia
Posts: 1,115
Thanks: 1,729
Thanked 912 Times in 473 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
|
Funzies. DE 2 for now. Thanks for the suggestions.
|
09-05-2021, 02:13 PM | #12 | |
Senior Member
Join Date: Jan 2018
Drives: 2017 toyota 86
Location: PNW
Posts: 2,131
Thanks: 336
Thanked 1,188 Times in 781 Posts
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
|
Quote:
But here is my list of aero. Pretty good setup for a fun daily, everything functional, and also aesthetic in my opinion. The verus/jdm /speed factory combo underneath the car is effectively what you are after, without some custom fab work it’s about as smooth and flat underside as you can get, with the flat panels from front bumper to the rear diffuser all connected. Aero: Seibon FA Carbon Hood Greddy Gracer Front Lip Beatrush Undertray JDM Aero Underpanels OEM Rear Spoiler Verus Front Wheel Deflectors Verus Trans Tunnel Covers Verus Rear Aero Spats FT-86 Speedfactory Rear diff covers FT-86 Speedfactory Rear Diffuser TRD Front Fender Fins TRD Trunk Stabilizer cover TRD Aero Turbulator STI Side Skirts |
|
The Following User Says Thank You to 86TOYO2k17 For This Useful Post: | blsfrs (09-06-2021) |
10-02-2021, 10:01 AM | #13 |
Senior Member
Join Date: Dec 2018
Drives: 2013 frs base
Location: central Virginia
Posts: 1,115
Thanks: 1,729
Thanked 912 Times in 473 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
|
I installed the Devsport splitter. I probably should have saved my time and money. It is composite aluminum and well made but, when it is bolted to the bottom of the bumper, it angles upward by a few degrees. This is not the aero effect that I was looking for. Devsport make some wedges but this will create a gap between the splitter and bumper that will need some sort of air dam. Over the winter I'll figure some out or scrap it all together.
|
10-02-2021, 01:20 PM | #14 | |
Senior Member
Join Date: Jan 2018
Drives: 2017 toyota 86
Location: PNW
Posts: 2,131
Thanks: 336
Thanked 1,188 Times in 781 Posts
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
|
Quote:
This is what I use to fill on the bumper splitter gap. Can cut it to shape and it will squish a little to form. |
|
The Following 3 Users Say Thank You to 86TOYO2k17 For This Useful Post: |
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Top 3 Aero Mods | thekevinvo | Cosmetic Modification (Interior/Exterior/Lighting) | 63 | 10-16-2020 04:02 PM |
Turbo build plus aero mods | SpeedDemon26 | Want-To-Buy Requests | 1 | 02-07-2017 07:50 PM |
Functional Aero Parts and their effects ? | glamcem | Tracking / Autocross / HPDE / Drifting | 185 | 09-19-2014 07:08 PM |