2.4L vs 2.7L Hellcat Superchargers: How to Tell Which One You Have and Why It Matters

If you own a Hellcat-family Mopar — Challenger, Charger, Durango, Trackhawk, TRX, Demon, Redeye, Jailbreak, Super Stock — there is an IHI twin-screw supercharger sitting under your intake. It is one of two sizes: the 2.4-liter rotor pack or the 2.7-liter rotor pack.

The number refers to the volume of air the rotors sweep per revolution, not engine displacement. Almost every parts decision you'll make on this platform — pulley, snout, ported housing, intercooler, rebuild kit — depends on knowing which one you have.

This guide covers what each blower is, how the factory paired them across model years, how to identify yours without guessing, and what the difference means for an upgrade path.

---

The two superchargers, in plain English

Both blowers are made by IHI (the Japanese turbomachinery manufacturer). Both are twin-screw, positive-displacement designs — two interlocking helical rotors that pull air in and trap a fixed volume per revolution. That's what gives the Hellcat platform its instant low-RPM boost response and linear curve.

The difference is rotor pack size:

• 2.4L IHI – Used across the standard Hellcat output tier (707 hp factory rating at the crank).
• 2.7L IHI – Introduced for the higher-output trims that needed more airflow per revolution to hit 797–1,025 hp factory ratings.

A common misconception is that the 2.7L is just running more boost. It isn't. At the same pulley diameter and engine RPM, the 2.7L moves more air per revolution because the rotor pack is physically larger. That extra mass flow is what feeds the higher factory horsepower numbers — and it's why the 2.7L tolerates more aggressive pulleys with less heat soak than a comparably-pulleyed 2.4L.

---

Which Hellcat-family vehicles got which blower

The factory split is mostly clean and follows trim level rather than calendar year.

2.4L IHI applications

The 2.4L supercharger shipped on:

• 2015–2023 Dodge Challenger SRT Hellcat (standard, non-Redeye)
• 2015–2023 Dodge Charger SRT Hellcat (standard, non-Redeye)
• 2018–2021 Jeep Grand Cherokee Trackhawk
• 2021–2024 Ram 1500 TRX

2.7L IHI applications

The 2.7L supercharger shipped on:

• 2018 Dodge Challenger SRT Demon
• 2019–2023 Challenger SRT Hellcat Redeye & Redeye Widebody
• 2020 Challenger Super Stock
• 2023 Challenger SRT Demon 170 (factory E85 car; rated 1,025 hp on E93, 900 hp on 91 octane)
• Hellcat Redeye Jailbreak variants across model years

If you're cross-referencing a build sheet or window sticker, the supercharger size is implied by the engine option code:

• "Supercharged 6.2L HEMI SRT Hellcat" → 2.4L
• Any Demon, Redeye, Super Stock, Jailbreak, or Demon 170 designation → 2.7L

---

Three reliable ways to ID yours

You do not have to pull the blower to know which one you have.

1. Build sheet, window sticker, or VIN decode (cleanest answer)

The factory engine option code is the source of truth. A Mopar dealer parts counter or a reputable VIN decoder can pull it for you.

• If the engine is listed as "Supercharged 6.2L HEMI SRT Hellcat" with no Demon/Redeye/Super Stock/Jailbreak language, you are in 2.4L territory.
• If the build sheet or window sticker calls out Demon, Redeye, Super Stock, Jailbreak, Demon 170, you are in 2.7L territory.

2. Trim level plus model year

The application matrix above is correct for the overwhelming majority of cases. A few examples:

• 2020 Challenger Hellcat Widebody (non-Redeye) → 2.4L
• 2021 Charger Hellcat Redeye Widebody → 2.7L
• 2019 Trackhawk → 2.4L
• 2022 TRX → 2.4L

If your car is one of the obvious entries, you can move forward with confidence.

3. Visual ID off the engine

Once you've seen both, the visual difference is straightforward:

• The 2.7L has a noticeably wider snout casting and a different inlet shape than the 2.4L.
• The 2.4L snout is slimmer and the inlet geometry is tighter.

Side-by-side it’s obvious; from a phone photo it takes a trained eye. If you’re not sure, send a clear photo of the snout casting before you order any parts — it’s a quick confirmation.

You can do this with the airbox removed; you do not need to pull the supercharger.

---

Why the parts list doesn't cross over

The two blowers do not share rotor packs, snouts, or ported housings.

They do share some peripheral hardware:

• Drive belts
• Idler pulleys
• Throttle body bolt patterns

But the parts that matter for power are platform-specific:

• Upper and lower pulleys
• Snouts
• Ported housings
• Rotor kits
• Bearing and seal kits

A few practical implications:

• Buying a generic "Hellcat" upper pulley without confirming 2.4L vs 2.7L is a 50/50 coin flip on whether it fits the inlet.
• A ported 2.4L housing will not bolt to a 2.7L, and vice versa.
• Snout porting is platform-specific. The intake geometry differs between the two blowers enough that running both through identical machine paths produces inaccurate results — the geometry simply isn’t the same.
• Rebuild kits are sized to the rotor pack. Bearings, seals, and clearance specs differ between 2.4L and 2.7L.

---

What the size difference means for upgrades

Both blowers respond to the same modification categories: pulley sizing, porting, intercooling, fueling, and calibration. The platform differences dictate how far each modification carries and where the ceiling lands.

Building on the 2.4L

The 2.4L has a shorter power runway before the rotor pack itself becomes the restriction. Typical progression:

• Pulley reduction is the first move. Dropping from the stock upper to around 2.75" gains real airflow. Below 2.625" on pump gas, heat soak starts showing up in back-to-back pulls without methanol or an upgraded intercooler.
• Snout porting reduces inlet restriction at high airflow demand. Most effective when the rotor is already spinning hard from a smaller pulley.
• Intercooler capacity matters more on the 2.4L because the smaller rotor pack generates heat faster per unit of airflow. Heat soak shows up earlier in consecutive pulls.
• E85 or methanol drops charge temps and gives the tune more timing room. A well-supported 2.4L on E85 with a ported snout and pulled pulley can reach the 800–900 whp range depending on supporting mods.

Past roughly 800–850 whp, the 2.4L rotor pack is typically the limiting factor. More pulley and fueling past that point yields diminishing returns because airflow capacity is the ceiling, not combustion efficiency.

Building on the 2.7L

The 2.7L has a wider power runway from the same modifications because it moves more air per revolution at the same shaft speed.

• Pulley reduction still leads the build. The 2.7L tolerates more aggressive sizing — a smaller upper that causes consistent heat soak on a 2.4L is often manageable here because the rotor doesn't have to spin as fast to produce the same airflow.
• Snout porting carries more return on the 2.7L because the larger rotor pack can use the additional inlet area. The work is more effective, not just faster.
• E85 on a 2.7L Redeye, Super Stock, or Demon platform with an aggressive pulley and proper calibration is a reliable path to 1,000 whp without exotic rotating assembly work.

The 2.7L is the stronger platform for a high-power build. The 2.4L can reach serious numbers, but it requires more supporting infrastructure to get there and hits its ceiling sooner.

The 2.4L-to-2.7L supercharger swap

It comes up often. The short answer: physically possible, not a simple bolt-on.

The rotor housings, snouts, upper inlets, and lower inlets do not cross over. A 2.7L going into a 2.4L application needs its own matching snout, inlet, and ancillary bracketry, plus a calibration built around the different airflow curve — none of which carries from the 2.4L.

The swap makes sense when it's part of a larger engine build where the parts cost fits alongside other work. As a standalone modification on a running car, the 2.4L porting and fueling path typically gets you further with less complexity.

Hellcat IHI 2.4L vs 2.7L Supercharger Quick Reference

What the sizes mean

• 2.4L IHI and 2.7L IHI refer to the rotor pack displacement (air volume swept per revolution), not engine size.
• Both are IHI twin-screw, positive-displacement superchargers.
• At the same pulley and RPM, the 2.7L moves more air per rev than the 2.4L, which is why it supports higher factory power and more aggressive pulley ratios with less heat.

---

Factory applications

2.4L IHI

Used on the standard-output Hellcat tier:

• 2015–2023 Dodge Challenger SRT Hellcat (non-Redeye)
• 2015–2023 Dodge Charger SRT Hellcat (non-Redeye)
• 2018–2021 Jeep Grand Cherokee Trackhawk
• 2021–2024 Ram 1500 TRX

2.7L IHI

Used on higher-output trims:

• 2018 Dodge Challenger SRT Demon
• 2019–2023 Challenger SRT Hellcat Redeye & Redeye Widebody
• 2020 Challenger Super Stock
• 2021–2023 Charger SRT Hellcat Redeye Widebody
• 2023 Challenger SRT Demon 170 (E85-capable, 1,025 hp on E93)
• All Hellcat Redeye Jailbreak variants

Build sheet / engine code shortcut

• Engine listed as “Supercharged 6.2L HEMI SRT Hellcat” with no Demon/Redeye/Super Stock/Jailbreak language → 2.4L.
• Any mention of Demon, Redeye, Super Stock, Jailbreak, Demon 170 → 2.7L.

---

How to identify your blower (no disassembly required)

1. Build sheet / window sticker / VIN decode
   • Pull the engine option code via dealer or VIN decoder.
   • Standard Hellcat language only → 2.4L.
   • Demon/Redeye/Super Stock/Jailbreak/Demon 170 → 2.7L.
2. Trim + model year (rules of thumb)
   • Standard Hellcat Challenger/Charger, any year → 2.4L.
   • Trackhawk (2018–2021) → 2.4L.
   • TRX (2021–2024) → 2.4L.
   • Any Redeye, Demon, Super Stock, Jailbreak, Demon 170 → 2.7L.
3. Visual snout check (airbox removed only)
   • 2.7L: visibly wider snout casting, different/larger inlet shape.
   • 2.4L: slimmer snout, tighter inlet geometry.
   • If unsure, send a clear snout photo before ordering parts.

---

Parts compatibility: what does not cross over

The 2.4L and 2.7L do not share:

• Rotor packs
• Snouts
• Ported housings

Hellcat 2.4L vs 2.7L IHI Supercharger — Ordering & Setup Cheat Sheet

1. Identify Your Supercharger by Platform

2.4L IHI (707–710 hp factory rating)

• Challenger SRT Hellcat (2015–2023)
• Charger SRT Hellcat (2015–2023)
• Durango SRT Hellcat (2021)
• Ram 1500 TRX (2021–2023)
• Jeep Grand Cherokee Trackhawk (2018–2021)

2.7L IHI (797+ hp factory rating)

• Challenger SRT Hellcat Redeye (2019–2023)
• Charger SRT Hellcat Redeye (2020–2023)
• SRT Demon (2018)
• SRT Demon 170 (2023)

If trim is unclear (used car, swapped parts):

• 2.7L has a visibly wider inlet and snout than the 2.4L.
• Casting numbers differ; send a clear photo of the blower to FAS for confirmation.

---

Boost & Pulley Basics

• 2.4L stock boost: ~11.6 psi at factory pulley ratio.
• 2.7L: more air per revolution → higher boost at the same ratio and a wider powerband.
• A pulley change that adds ~2 psi on a 2.4L will not equal the same final boost on a 2.7L. Do not reuse 2.4L math on a 2.7L.

Key rule: Always calculate pulley ratios and expected boost for your specific displacement.

---

Why Parts Don’t Cross Over

Internal differences between 2.4L and 2.7L:

• Rotor profiles
• Snout dimensions
• Inlet port geometry
• Bearing surfaces

Consequences:

• A 2.4L upper pulley is the wrong ratio for a 2.7L.
• A 2.4L porting template does not match 2.7L ports.
• Mis-matched parts can:
  • Kill airflow gains
  • Cause fitment issues

Summary: 2.4L vs 2.7L IHI Hellcat Superchargers

Core idea: Hellcat platforms ship with two visually similar but mechanically different IHI superchargers — the 2.4L and 2.7L. Knowing which one you have is critical before ordering pulleys, porting, or other blower-related parts.

---

Which Supercharger Do You Have?

2.4L IHI (707–710 hp factory rating)

• Challenger SRT Hellcat (2015–2023)
• Charger SRT Hellcat (2015–2023)
• Durango SRT Hellcat (2021)
• Ram 1500 TRX (2021–2023)
• Jeep Grand Cherokee Trackhawk (2018–2021)

2.7L IHI (797+ hp factory rating)

• Challenger SRT Hellcat Redeye (2019–2023)
• Charger SRT Hellcat Redeye (2020–2023)
• SRT Demon (2018)
• SRT Demon 170 (2023)

If trim is unclear (used car, swapped parts):

• 2.7L has a visibly wider inlet and snout than the 2.4L.
• Casting numbers differ; a clear photo sent to FAS can confirm.

---

Why Two Different Units?

To get from the standard 707 hp rating to Redeye/Demon power levels without a new long block, Chrysler used:

• A larger-displacement 2.7L blower (more rotor volume per revolution)
• A larger inlet throat and different internal clearances

Same 6.2L block and accessory layout, but a meaningfully different forced-induction package.

---

Boost & Pulley Behavior

• 2.4L: ~11.6 psi at stock pulley ratio.
• 2.7L: Moves more air per revolution, so at the same pulley ratio it makes more boost and a broader powerband.