APR Diffuser
Administrator
Joined: Mar 2001
Posts: 368,075
Likes: 24,732
From: In a parallel universe. Currently own 2014 Stingray Coupe.
C7 of the Year - Modified Finalist 2021
MO Events Coordinator
St. Jude Co-Organizer
St. Jude Donor '03 thru '25
NCM Sinkhole Donor
CI 5, 8 & 11 Veteran
From the pic, that diffuser looks really good. Nice addition to your car.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Thread Starter
Burning Brakes
Joined: Mar 2010
Posts: 921
Likes: 134
From: Chicago Illinois
Intermediate
Joined: Jun 2018
Posts: 48
Likes: 17
From: Brisbane CA
I like the look of the diffuser, but is it just eye candy? I've read that in some cases diffuser's can improve airflow at the rear of the vehicle. But am wondering if we see any real-world performance increase with the C7. Thoughts?
Thread Starter
Burning Brakes
Joined: Mar 2010
Posts: 921
Likes: 134
From: Chicago Illinois
Les
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Melting Slicks
Joined: Oct 2008
Posts: 3,359
Likes: 604
While I do not track as I understand it air pressure created beneath the car gets affected by the diffuser, which helps the air pressure to normalize as the vehicle moves forward cutting the air. Similar to an airplane wing or the rear spoiler of the car, the car rear diffuser makes use of Bernoulli’s Principle to decreases the air pressure beneath the car and increase the speed of the air.As the car moves down the road, air at high speed is passing underneath the car at low pressure. As the low-pressure air reaches the rear portion of the vehicle, through the car rear diffuser, it expands in an expansion chamber. When the air expands, the Venturi effect takes place, where the air pressure is increased and the airspeed is reduced, significantly. The differences in the air pressure between the high-pressure at the car rear and low-pressure under the car creates a vacuum and sucks the air out of the car. With low air pressure under the car and high-pressure above, increased downforce is created and the aerodynamic drag is reduced.
That said, again I do not track so for me it also provided a slightly more aggressive look, there are much more aggressive versions and whole rear diffusers that you can add on. What I can tell you is what I observed is that during a rain storm, which make the air flow from under your car much more visible, prior to the diffusers the rain was just a blast coming out of the rear , with them installed they are tightly defined columns …pretty cool to watch
That said, again I do not track so for me it also provided a slightly more aggressive look, there are much more aggressive versions and whole rear diffusers that you can add on. What I can tell you is what I observed is that during a rain storm, which make the air flow from under your car much more visible, prior to the diffusers the rain was just a blast coming out of the rear , with them installed they are tightly defined columns …pretty cool to watch
