FR-S / BRZ / GT86 Intake Manifold Progress
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Why build an intake manifold? What we have found from our CFD models is that the OEM manifold air flow is considerably bias to the rear cylinders of the plenum. The manifold design below is our current and best iteration for even air flow to all cylinders. We accomplished this task by moving the back of the plenum wall forward, giving the manifold a “U-shape”. After multiple iterations of CFD analysis and moving the back wall forward, we found what was the best fit. The current manifold build represents this and hopefully performs reasonably better than the OEM intake manifold.
Besides the shape are there any other major changes? Yes, the manifold is about 1.5 inches taller than the OEM intake manifold and we have moved the throttle body forward about 2 inches. We made these changes to provide better air flow to all cylinders and hopefully gain the benefits of longer runners, much like the aluminum billet spacers for the OEM manifold. We have also added several NPT ports on the back of the manifold for easy vacuum reference.
If the intake manifold performs well, we will be releasing it for sale. The production version of the manifold would use mandrel bent runners and would eliminate the weld found on the right hand side of the manifold runners. The manifold will require tuning and we do not suggest using it on the OEM tune. We are seeing noticeable air flow differences from 3000 to 5000 RPM, enough so that its requiring additional fuel. Hopefully this will be another addition and step forward to further eliminating the torque dip commonly found with the platform.
If you have any questions, concerns or comments please let us know. We look forward to hearing from you.
OEM intake manifold pictured above.
CFD for Racer X intake manifold above.
Racer X intake manifold installed. More detailed photos below.
We are currently testing the FR-S / BRZ / GT86 intake manifold. If you would like to receive updates on the development, please sign up below.