Does anybody made a DIY rear undertray/diffuser ?
- Thread starter GriffX
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Candy10
forum member
I wonder how close in size the GT350 piece is to what would be needed on an S197, maybe could be adapted. But may be easier to find someone talented with ABS molding to have one done. When I was tracking my car, I always wanted to eventually make the entire underside as smooth as possible, using pieces like this. Never reached that point before changing direction on the cars purpose, but if bolt on pieces like this were available itd be a no-brainer
rocknrod
Member
Close as I could find - https://www.evasivemotorsports.com/...fua0k8OaXpMuo3YQzGJAEsBz6bIoEdXVDM2Ql9UzicNS0
I haven't found the dimension of the GT350 part. The needed size is roughly 80x80 cm. The GT350 part is bolted to the bumper on one side and to a bracket to the underbody between the sway bar and the differential.
On our cars we must attach a bracket to the spare tire panel.
I was not able to find any information about the APR part, how long it is, where it is bolted, no instruction, no detailed picture.
These projects are always very down on the to-do list, it takes a lot of time just for the "how to bolt on" part. I spent many hours just to look at my front underbody to get ideas for the front undertray.
On our cars we must attach a bracket to the spare tire panel.
I was not able to find any information about the APR part, how long it is, where it is bolted, no instruction, no detailed picture.
These projects are always very down on the to-do list, it takes a lot of time just for the "how to bolt on" part. I spent many hours just to look at my front underbody to get ideas for the front undertray.
Dino Dino Bambino
I have a red car
Not worth the money IMO.
Mine's a simple DIY black plastic job that fills the void between the evap system and the rear bumper cover. This substantially reduces the amount of air that stacks up behind the bumper cover and potentially reduces drag, especially at higher road speeds.
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Candy10
forum member
Simple many times works best, even if it isnt as "pretty". I like this idea
Sorry, I'm German, no easy solutions allowed hahahaha..... look at Vanos from BMW
Do you guys have thoughts about that, except very expensive:
www.fordgt500.com
2020+ - New underbody strakes aero from Steeda GT500...
C2 aero makes some good rear diffusers that even cover the evap in the rear. APR sells the front one's that extend to the sides of the front bumper. Couple that with the 2010+ extension and louvered trays, should make a difference in cooling, hood flutter and stability on the road
Thanks, that was helpful. I made an almost flat front undertray, it also lowered the wind noise.
Dino Dino Bambino
I have a red car
In addition to my DIY rear under tray, I've also done several front aero mods resulting in significantly better gas mileage, high speed stability, and NO MORE hood flutter:
No mileage compare so far, but I noticed a much smoother ride on the Autobahn with the front undertray.
How do these splitter strut rods work? Are they stable in all directions or do they have a weak point? Are they adjustable in length?
Candy10
forum member
My 2010 doesnt have that louvered splash shield. Now I want it
I made one from ABS and lowered the part at the radiator support on my 07. The height difference from front to the k-member is now only one inch. Next time I order some ABS sheets I will probably change the OEM part also to make it flat.
DieHarder
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Is that a home lift? Who makes it? What does it cost?
It's the ezcarlift.com I bought it when I repaired my differential. All lift have pros and cons. Nice is I can support the engine by putting a 2x4 below it and lower the lift by millimeters. I really like it.
Yes, I know I'm crazy..... I made homebuild underbody strikes according to the option from the S650. Car feels very stable on the Autobahn. I'm sure one can use the Ford OEM parts and modify the mount points to fit under our k-members. I'm not sure if they only work in combination with a flat engine undertray, because it looks like they direct the dirty air from the tire and suspension to the side let only the clean air from the middle of the car to the rear tire and axle.
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Dino Dino Bambino
I have a red car
I went even further and made a pair of curved air deflectors that are mounted ahead of the front wheel houses and cover the full width. These really do make the car more stable at high speeds and improve gas mileage by reducing drag.
This was the latest aero drag reducing mod I performed after previously adding front under tray extensions, a 2010 louvred under tray between the radiator support and K-member, my own custom K-member under tray, and a rear diffuser.
Highway gas mileage on my last 100 mile round trip (50 miles each way on same route) was astonishing even by my standards at 28.5mpg (8.25L/100km) averaging 70mph.
This was the latest aero drag reducing mod I performed after previously adding front under tray extensions, a 2010 louvred under tray between the radiator support and K-member, my own custom K-member under tray, and a rear diffuser.
Highway gas mileage on my last 100 mile round trip (50 miles each way on same route) was astonishing even by my standards at 28.5mpg (8.25L/100km) averaging 70mph.
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28 is great. I don't have some reliable values so far, stuck too often in heavy traffic. I added some 2x3 air deflectors in front of the tires, you can see them in the picture above. The big like yours will add some more lift i guess, I go sometimes 120 mph so I was looking what Mercedes and BMW is doing.
Dino Dino Bambino
I have a red car
Actually lift is reduced because less turbulent air gets swirled around inside the front wheel houses. Instead my C shaped deflectors move the air both to the outside the car and straight through via the undercarriage to the back.
Combined with the foam that I added on the inside of the hood near the front lip, there's virtually no hood flutter even driving into a headwind at 100mph and the car is very stable. A sign of increased lift is lightening of the steering wheel at speed but there's definitely none of that.
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