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Old 07-22-2022, 02:25 PM   #10 (permalink)
Caddylackn
EcoModding Apprentice
 
Join Date: Jun 2022
Location: Bremerton, WA
Posts: 108

Passat TDI Wagon - '97 VW Passat Wagon TDI
90 day: 54.32 mpg (US)

Blue - '21 Hyundai Sonata Blue
90 day: 49.97 mpg (US)
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Diffuser part 2

So I built a diffuser out of an old Sears rooftop carrier. It was plastic and had a curve I could use, and it was going in the trash anyway. I did build some strakes, mostly for support. These are riveted on to provide strength. Looks a little like tuner bling but they add a bunch of strength and kept a good curve in it for transition.




I had to cut the rear bumper, which bothered me at first, but it was a parachute really. I cut nothing but plastic, so its integrity is not compromised.



The bumper is cut flush to the steel support beam. The diffuser angle is a little steep, probably 15 degrees or so, but I can flatten it by adding a fill in piece at the bumper. I will do some tuff testing once the full undertray is in to determine the proper angle.
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__________________
97 Passat TDI Wagon
Bosio 520 DLC nozzles, chip tune
Mufflerectomy, ALH Injection Pump
317k miles
Scan Gauge II
full belly pan
26 gallon tank
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