Does Porting Your Hellcat Supercharger Require a Retune?

Yes — after porting your Hellcat supercharger, a retune is strongly recommended. Here is why that matters and what to expect.

What Porting Actually Changes

Supercharger porting is a machining process that enlarges, smooths, and reshapes the inlet and outlet ports of the blower housing. The goal is to reduce airflow restriction and turbulence, increasing the volumetric efficiency of the unit without changing its displacement.

On the factory IHI 2.4L twin-screw supercharger found on Dodge Hellcat platforms, the OEM casting leaves material that restricts airflow — a cost-savings decision on Chrysler’s part that leaves real power on the table. Porting removes that restriction and allows the blower to move air more efficiently at all RPM.

What that means practically: your engine is now flowing more air than when the factory tune was written. The stock ECU calibration was built around stock airflow characteristics. Once those change, the calibration drifts out of optimal range.

Why the Stock Tune No Longer Fits

Factory ECU calibrations on Hellcat platforms are written to specific airflow windows, fuel trims, and boost targets. When you increase the airflow capacity of the blower through porting, the boost curve changes — the ported housing can build pressure more efficiently, altering when and how the blower delivers boost across the RPM band. Air and fuel ratios shift as well — more air into the cylinder means the factory fueling table can run lean in certain load cells. Timing tables also need adjustment — with denser, cooler charge air (a side effect of reduced restriction), ignition timing can often be advanced safely, but only if the tune is updated to take advantage of it.

Running a ported supercharger on a stock tune is not catastrophic in the short term. But you are leaving power on the table and, depending on your fuel and operating conditions, running leaner than ideal.

What About E85 and 93-Octane Tunes?

If you are already running an E85 or flex-fuel tune, the same logic applies. The tune was written for your blower in its stock airflow state. Post-porting, your tuner should revisit the fuel tables and boost targets to account for the improved flow. The good news: with a ported blower and a proper retune, E85 builds routinely see meaningful gains over a stock-tune ported setup.

The Flow-Bench Step at FAS

When you send your blower to FAS Motorsports for porting, it goes through a documented flow-bench verification before it ships back. This is not just quality assurance — the flow data from your specific unit can be handed directly to your tuner so they know exactly what changed and by how much.

FAS ports in-house at their Punta Gorda, FL shop with a 3–5 business day turnaround on ship-in orders. No outsourced machining, no middleman. The flow-bench result is part of what you are paying for.

Do You Need to Tune Before Porting?

A common question: should you get a tune before or after porting? The correct order is port first, then tune. There is no benefit to tuning against a blower you are about to change. Get the mechanical work done — porting, any supporting mods — then take the car to your tuner with a list of what changed. Your tuner will pull the flow data, baseline the car, and write the calibration against the actual hardware configuration.

If you already have an aftermarket tune, your tuner will simply revise it. Expect a dyno session rather than a full tune from scratch.

Frequently Asked Questions

Can I drive the car immediately after getting the ported blower back?

Yes. The ported blower installs just like the stock unit. You can drive on the stock tune — but book your tuner appointment promptly. You are not making full use of the mod until the tune catches up.

Does FAS do the tuning as part of the porting service?

FAS handles the mechanical porting and flow-bench verification. Call (812) 200-9012 to discuss your full build plan and they can point you toward tuning resources.

What if I’m running stock boost and no other mods?

Even on a stock-boost setup, porting changes the airflow equation. A tune revision is still the right call. The gains from porting alone on a proper tune are meaningful — you want to capture all of them.

Will porting void my powertrain warranty?

Aftermarket modifications, including supercharger porting, can affect powertrain warranty coverage. If your vehicle is under warranty, consult with your dealer before making modifications.

How long does the ship-in porting service take?

FAS Motorsports turns ship-in porting orders in 3–5 business days at their Punta Gorda, FL facility.

Ready to Ship Your Blower?

FAS Motorsports handles Hellcat supercharger porting in-house from their Punta Gorda, FL shop. Flow-bench verified. 3–5 business day turnaround. Call (812) 200-9012 to get started.