The ultimate C8 Corvette z06 Intake dyno Test: Eventuri vs JLT
By: Justin Gora
Paragon Dyno Testing Methods
Before we dive into the results, it's important to understand our testing methods. In our facility, we have a fully enclosed dyno cell where fresh air is pulled from the front and then extracted out the rear using two large industrial pull fans.
After the vehicle is strapped down to our DynoJet Dynamometer (Dyno), the test vehicle, in this case a C8 Corvette Z06, is brought to operational temperature. Throughout our testing, we monitor the following temperatures: Oil, Coolant, Air Intake & Gearbox. Using HPTuners, we are able to data log the vehicle's timing curve, fuel curve, and throttle position. Each dyno run starts at the same temperature level, as a variance can skew our results.
C8 Corvette Z06 intake dyno results: Peak Numbers
For this test, we used Rob's (@RobWithAZ06) stock C8 Z06, which was on 93 octane. In past testing with 91 octane, we have seen noticeable power losses as expected. Graham, our in-house tuner, utilized our testing methods to establish a consistent baseline of 610whp & 424wtq.
Next, we removed the stock intake, directly on the dyno, to a JLT intake. The vehicle, which was being cooled during the change, was brought to the same operating temperature as the first runs. Multiple pulls were then completed to establish a baseline of 628whp & 429wtq.
C8 Z06 Intake Dyno Graphs: Intake Manifold Valve Changes
Through the powerband on the LT6 engine, it is noticeable that there are multiple dips, these are caused by the phasing of three valves joining the two independent intake plenums. The valves’ positions restrict the airflow on all three intake systems. However on the JLT, the power dips below OEM levels in all of the phasing points, whereas the Eventuri gains in two of the three. Let’s break down each intake at 4500, 5700 & 6600 RPM.
4500 RPM Comparison
The first of three dips occurs near 4500 RPM, and the JLT Cold Air Intake for the C8 Z06 dips below OEM levels by 10whp and 12wtq.
At the same RPM, the Eventuri Carbon Fiber Intake System gains 8whp and 9wtq over OEM.
5700 RPM Comparison
The second dip occurs near 5700 PRM, and the JLT intake is 23whp & 21wtq lower than OEM.
The Eventuri Intake has a smaller drop of 4whp & 4wtq at the same 5700 rpm point.
6600 RPM Comparison
The third and final dip comes near 6600 RPM. The JLT intake dipped slightly below the OEM airbox, losing 5whp and only 2wtq.
The Eventuri intake system stays above stock with an increase of 2whp and 2wtq.
C8 Z06 Intake Dyno Testing: Above the Curve
Next, we move onto where both of these aftermarket options shine and truly flow some air.
First, we'll compare a range of 5000-5300 RPM ON all three intakes. At 5000 RPM, the baseline run produced 386whp & 405wtq. The JLT improved to 408whp & 429wtq, gains of 22whp and 23wtq. The Eventuri Intake improved to 414whp & 435wtq, gains of 28whp and 29wtq.Just slightly up the powerband at 5390rpms, our baseline is at 419whp & 409wtq. The JLT matches OEM power levels while the Eventuri continues to increase power by 20whp & 20wtq.
Our next data point is at 6000 RPM, just past the 5700rpm dip. The OEM airbox produced 461whp & 403wtq, JLT has a gain of 12whp & 11wtq with the Eventuri almost doubling that at 23whp & 20wtq.
Lastly, we're moving way up the powerband to 7000 RPM where the C8 Z06 shines and continues to pull past 8500 RPM! The stock airbox produces 553whp & 398wtq, JLT Improves power by 16whp & 11wtq with the Eventuri yet again being on top with gains of 27whp & 20wtq.
Which C8 Corvette Z06 Intake is best for you, Eventuri or JLT?
From our results, both aftermarket intakes produce a similar peak WHP and WTQ gain over stock with the Eventuri edging out the JLT by 3whp and 9wtq. Comparing the numbers in the mid range, where you'll be doing most of your street driving, the Eventuri gains and holds more power across the full powerband.
We did notice multiple large dips in power with the JLT compared to the OEM airbox so if peak performance is what you're looking for, the Eventuri is your clear choice.
From a styling standpoint, the Eventuri is made entirely from Carbon Fiber and includes a clear cover so it is possible to view while the deck lid is open. The JLT is made from a robust HPDE plastic and includes a clear lid for the air filter but gets hidden by the OEM trunk panel and carpet, which is a miss for us. 
Our thorough testing of the C8 Corvette Z06 intake options reveals clear performance differences between the Eventuri and JLT systems. While both offer noticeable gains over stock, the Eventuri stands out for its consistent power delivery across the entire powerband. With its carbon fiber construction and sleek design, the Eventuri not only enhances performance but also adds a touch of style to your engine bay. Ultimately, whether you prioritize peak performance or a balanced power distribution, the Eventuri emerges as the top choice for Corvette enthusiasts.
