Performance Increase : 10-14hp, 10-11ft-lb

*Images show our optional carbon engine cover.

The GR86 Intake is a culmination of testing numerous configurations with over 125 dyno runs to arrive at an optimised design. We tested both stock and tuned cars to assess the impact of changing the intake for a less restrictive version. The NA 2.4L Boxer engine is sensitive to intake air temperatures so our initial priority was to ensure a fully sealed system. Dyno testing revealed a dip in power around 6000rpm on the stock ECU. This dip persists no matter what the intake configuration is – even with all possible restrictions removed, a higher flowing intake creates a strong engine resonance at this rpm causing a momentary dip below the stock curve. The stock airbox has a baffling effect at this rpm but then also restricts the power at the top end. By iterating our design through testing different intake lengths, single and dual duct openings and even adding baffles, we arrived at a version which minimises the resonance dip while gaining 14hp at the top end on the stock ECU. Once the ECU is tuned we can see large mid-range gains and an elimination of the dip in power below the stock curve.
 

The Eventuri Difference

The GR86 Eventuri system uses our Patented Carbon fiber Housing which provides an aerodynamically efficient airflow path from the filter to the engine. Not just another cone filter with a heat shield but a unique design which invokes the Venturi affect and maintains laminar flow conditions to reduce the drag on the engine.

Dyno Testing - STOCK ECU

Below is a dyno graph of a completely stock GR86 with just the airbox being swapped for the Eventuri intake. This was independently tested at DREAM automotive. Several runs were done with the OEM airbox to get a repeatable result and then again with the Eventuri intake. Tests were done on the same day back to back. Results show an increase in peak torque and power with a "resonance" dip between 5700-6300rpm after which the power gain amounts to 14hp as the curve crosses the stock line and continues to the RPM limit.

Dyno Testing - TUNED ECU

Below is a dyno graph of a GR86 which has been custom tuned by Paragon Performance in the USA. They tuned the car to run E85 with a closed loop fuel control to ensure fueling is identical on both the stock intake and Eventuri to remove the variability of the GR86 open loop fuel control. Paragon also tuned the ECU to eliminate the resonance issue and the results speak for themselves. All runs were carried out with the same tune and only the airbox was changed between runs. Tests were done on the same day back to back.

Dyno Testing - DEVELOPMENT

During development we iterated the intake and tested various configurations to arrive at the optimised version. Over 125 dyno runs were carried out and here is a visual representation of all that data.......