Engine & Power · Buyer's Guide
Fuel Pumps
The fuel pump delivers gasoline from the tank to the engine. The stock pump has a maximum flow rate — if you're adding a supercharger or running E85 ethanol fuel, you'll exceed that limit. When the pump can't keep up, the engine starves for fuel under boost (called 'running lean'), which causes detonation and catastrophic engine damage within seconds. A fuel pump upgrade or booster is absolutely critical for any forced induction build.
Recommended Picks
A starting point for your build, sorted by budget.
All Fuel Pumps (3)
View as grid19. FUEL SYSTEM — INJECTORS AND PUMPS
When Do You Need Upgraded Injectors?
- Stock 5.7L injectors: ~24 lb/hr — sufficient for stock and mild bolt-ons
- Stock 6.4L injectors: ~30 lb/hr — sufficient for Stage 1–2, marginal at Stage 3 NA
- Stock 6.2L Hellcat injectors: ~62 lb/hr — sufficient for stock boost, upgrade needed for pulley + power mods
Rule of thumb: Injectors should be sized at 80% duty cycle max. At 100% duty cycle, you're "running lean" at the top end. For a supercharged build, calculate needed injector size: HP ÷ BSFC ÷ number of injectors × safety margin.
Injector Size Guide by Build
| Build Level | Target HP | Injector Size |
|---|---|---|
| Stock / Stage 1 bolt-ons | Up to 500 HP | Stock size (no change) |
| Stage 2 + mild cam | 500–600 HP | 60 lb/hr (DeatschWerks) |
| Supercharged (mild boost) | 600–750 HP | 1000cc (DeatschWerks, ID) |
| Supercharged (aggressive) | 750–900 HP | 1100cc–1500cc |
| E85 flex fuel builds | Any HP | 1300cc+ |
Key Brands
- DeatschWerks: Most popular HEMI injector brand. Every unit is matched on a flow bench before shipping. 1000cc, 1100cc, 1500cc options for HEMI. Direct drop-in fit.
- Injector Dynamics (ID): Premium matched injectors. ID1050x is popular for supercharged builds.
- Mopar/OEM-size options: Good for mild builds where you just want direct replacement quality
When Do You Need an Upgraded Fuel Pump?
The stock in-tank pump flows approximately 255 l/hr — fine for naturally aspirated up to ~500 HP. Under boost or at high RPM with aggressive injectors, the pump becomes the bottleneck.
Pump options:
- DeatschWerks DW300 (340 l/hr, drop-in replacement) — best value direct-fit pump upgrade
- Walbro 450 LPH — high-output option for high-boost builds
- Fore Innovations Triple Pump Hat — for extreme builds 900+ HP where one pump isn't enough
- Boost-A-Pump (BAP) — increases voltage to stock pump temporarily under boost; band-aid solution but works for mild setups
Flex Fuel / E85 Notes
E85 ethanol has lower energy density than gasoline but higher octane (~105 RON). Running E85 requires:
- Injectors sized ~30% larger than gasoline-only equivalents
- Fuel pump capable of higher volume
- E85-compatible fuel rails and lines
- Custom tune for E85 fueling tables
- Flex fuel sensor (if running pump gas + E85 blend)
On E85, a supercharged HEMI can see 30–50+ HP over the same pump-gas tune due to higher octane and charge cooling from ethanol evaporation.
Site UX Recommendations
- Injector sizing calculator concept: "Enter your target HP and engine → see recommended injector size"
- "Required with supercharger" badge on injectors and pumps in the context of SC kits
- E85 compatibility clearly marked on fuel parts that support it
3. SUPERCHARGER KITS
Types of Superchargers
| Type | Examples | Power Band | Sound | Best For |
|---|---|---|---|---|
| Twin-Screw (positive displacement) | Whipple Gen 5, Magnuson TVS2650 | Strong low-to-mid torque, instant response | Whine under boost | Street driving, daily drivers |
| Roots (positive displacement) | Edelbrock E-Force | Similar to twin-screw | Aggressive blower whine | Similar to twin-screw |
| Centrifugal | ProCharger P-1SC-1, Vortech V-3 | Linear, builds with RPM | Turbo-like whistle | Track/high RPM use |
Power Numbers
| Kit | HP Gain | Engine | MSRP |
|---|---|---|---|
| Whipple Gen 5 3.0L | +200 HP | 6.4L Scat Pack | ~$9,500–$10,500 |
| Magnuson TVS2650 | +180 HP | 6.4L | ~$8,995 |
| Magnuson TVS2300 | +150 HP | 5.7L / 6.4L | ~$7,595 |
| ProCharger P-1SC-1 | +150 HP | 5.7L / 6.4L | ~$6,500–$7,500 |
| Vortech V-3 | +140–180 HP | 6.4L | ~$6,500+ |
Complete Kit vs. Tuner Kit — CRITICAL DISTINCTION
- Complete Kit: Includes blower + fuel injectors + fuel pump + tune + all hardware. Ready for a stock or lightly modified engine. Safe for beginners.
- Tuner Kit: Blower head unit ONLY. Assumes you already have custom fuel and tuning. NOT safe for beginners without extensive knowledge.
- Site must tag each product clearly. A beginner buying a Tuner Kit without knowing the difference can destroy their engine within minutes of driving under boost.
Required Supporting Mods
- Upgraded fuel injectors (sized for boost — typically 50–80% larger than stock)
- Upgraded fuel pump or pump booster (DeatschWerks, Walbro)
- MAP sensor upgrade (stock maxes at ~22 PSI)
- Custom ECU tune (MANDATORY — not optional)
- Colder-range spark plugs (prevent detonation)
- Lower thermostat / cooling upgrades (heat management critical)
Site UX Recommendations
- Red banner warning on all Tuner Kit listings: "Does not include fuel system or tune. For modified engines only."
- "What else do I need?" checklist on all supercharger pages.
- Kit type filter: Complete Kit / Tuner Kit.
- HP gain shown prominently — this is the #1 purchase driver.