Royal Flush
Aaron Demers
Check out Aaron Demers’ ‘93 LX running a Royal Flush! This is on his son’s car with original paint and interior. They are both trying to push the car into the 10s, and they are hoping the Royal Flush + 150 shot of nitrous will do just that! Be sure to check it out, and thanks again Aaron for sending in the pictures and video.
Aaron Demers
Royal Flush
View build
Royal Flush
4-bbl TBI system with built-in CDI for classic engines up to 650 hp
Royal Flush 2 EFI/CDI Standalone System
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- Self-learning fuel control with full laptop tunability
- Integrated digital Capacitive Discharge Ignition
- 4-bbl throttle-body fuel injection
- Externally mounted 32-bit automotive-grade Gen 2 ECU
- Expanded 31 × 31 VE, fuel, and spark tables
- Designed for high-compression, boosted, nitrous, and high-RPM applications
- Boost compatible
- Dual electric fan control
- Two-stage rev limiter
- Built-in fuel-level sensor input
- Single-solenoid boost control coming soon through a firmware update
- Available in Standalone, Fuel System, Top End, and Master Kit configurations
Royal Flush 2 EFI/CDI Standalone System
Precio de oferta$1,089.99
Precio normal$1,639.99
Product Info
Overview
The Royal Flush 2 is a 4-bbl throttle body EFI system with integrated CDI for classic engines. Aces is the only EFI manufacturer to produce integrated Capacitive Discharge Ignition (CDI) setups: no costly additional purchases Whether you're running high compression, forced induction, or aggressive racing setups, the Royal Flush 2’s high-voltage CDI system ensures maximum power and efficiency.
Why CDI?
Unlike traditional EFI systems that rely on weaker inductive ignition, Royal Flush 2’s CDI system produces a hotter, more consistent spark that burns fuel more efficiently, leading to:
- Superior combustion in high-boost or high-compression applications
- Increased power and throttle response
- Reduced misfires and improved fuel efficiency
Total Control for Performance Builds
Just like our Killshot system, the Royal Flush 2 EFI/CDI works with most classic engines with a 4150 intake flange. But what sets Royal Flush 2 apart is its built-in CDI technology and racing-grade features:
- Integrated Digital CDI – Produces 150mJ spark energy output for maximum ignition performance
- Massive Voltage Output – Primary voltage: 450-530V / Secondary voltage: 50,000V
- 2-Stage Rev Limiter – Set a max RPM limit for engine protection, plus launch control for optimal starts
- Burnout Mode – Holds RPM at a set limit for consistent, controlled burnouts
Core Features
- Self-learning and full tuning capability
- Expanded 31 x 31 tuning tables
- Integrated digital CDI with 150mj spark energy output
- 2-stage Rev limiter setting for max RPM, launch control, and burn out
- 32-bit software (OEM standard) that manages input/output signals, voltage, and RPM faster and more consistently than competitors
- Easy setup and monitoring with your choice of bluetooth module or HD handheld
- Integrated coil driver for ignition timing control (when using Aces’ coil and distributor)
- Simple calibration wizard for initial setup- no laptop tuning required.
- Dual fan control
- Step retard for nitrous control
- Boost compatibility right out of the box, with boost control coming soon
- Free laptop software available for pro applications
- Compatible with all Aces’ handhelds, dashes, and modules
- Dual 4.9 WBO2 sensors
From street builds to high-boost race cars, Royal Flush 2 EFI/CDI is the ultimate all-in-one ignition and fuel control solution. No need for a separate CDI box—Aces EFI is the only company to offer EFI and CDI in one ECU. If you’re serious about performance, The Royal Flush 2 is the system you need!
Specs
Royal Flush 2 EFI/CDI Standalone System Specifications
Additional specs are not currently listed for this product.
Documents & Resources
Royal Flush 2 Installation & Setup Manual
PDM Wiring Diagram for Royal Flush 2
Last updated: June 8, 2026
Royal Flush 2 ECU Drawing
Last updated: February 5, 2026
You can also visit our Manuals & Downloads page to browse all available resources.
What's in the box?
Items shown below reflect what normally comes in the box for each kit and may vary during certain promotion schedules.
Royal Flush 2 ECU (x1)
Royal Flush Throttle Body (x1)
Your choice of a handheld or bluetooth device (x1)
Royal Flush 2 Main Harness (x1)
Royal Flush 2 Sub-Harness (x1)
4.9 WBO2 Sensor (x1)
Coolant Temp Sensor (x1)
USB CAN Cable (for laptop software) (x1)
Additional Accessories Pack (x1)
The Royal Flush 2 is a 4-bbl throttle body EFI system with integrated CDI for classic engines. Aces is the only EFI manufacturer to produce integrated Capacitive Discharge Ignition (CDI) setups: no costly additional purchases Whether you're running high compression, forced induction, or aggressive racing setups, the Royal Flush 2’s high-voltage CDI system ensures maximum power and efficiency.
Why CDI?
Unlike traditional EFI systems that rely on weaker inductive ignition, Royal Flush 2’s CDI system produces a hotter, more consistent spark that burns fuel more efficiently, leading to:
- Superior combustion in high-boost or high-compression applications
- Increased power and throttle response
- Reduced misfires and improved fuel efficiency
Total Control for Performance Builds
Just like our Killshot system, the Royal Flush 2 EFI/CDI works with most classic engines with a 4150 intake flange. But what sets Royal Flush 2 apart is its built-in CDI technology and racing-grade features:
- Integrated Digital CDI – Produces 150mJ spark energy output for maximum ignition performance
- Massive Voltage Output – Primary voltage: 450-530V / Secondary voltage: 50,000V
- 2-Stage Rev Limiter – Set a max RPM limit for engine protection, plus launch control for optimal starts
- Burnout Mode – Holds RPM at a set limit for consistent, controlled burnouts
Core Features
- Self-learning and full tuning capability
- Expanded 31 x 31 tuning tables
- Integrated digital CDI with 150mj spark energy output
- 2-stage Rev limiter setting for max RPM, launch control, and burn out
- 32-bit software (OEM standard) that manages input/output signals, voltage, and RPM faster and more consistently than competitors
- Easy setup and monitoring with your choice of bluetooth module or HD handheld
- Integrated coil driver for ignition timing control (when using Aces’ coil and distributor)
- Simple calibration wizard for initial setup- no laptop tuning required.
- Dual fan control
- Step retard for nitrous control
- Boost compatibility right out of the box, with boost control coming soon
- Free laptop software available for pro applications
- Compatible with all Aces’ handhelds, dashes, and modules
- Dual 4.9 WBO2 sensors
From street builds to high-boost race cars, Royal Flush 2 EFI/CDI is the ultimate all-in-one ignition and fuel control solution. No need for a separate CDI box—Aces EFI is the only company to offer EFI and CDI in one ECU. If you’re serious about performance, The Royal Flush 2 is the system you need!
Royal Flush 2 EFI/CDI Standalone System Specifications
Additional specs are not currently listed for this product.
Royal Flush 2 Installation & Setup Manual
PDM Wiring Diagram for Royal Flush 2
Last updated: June 8, 2026
Royal Flush 2 ECU Drawing
Last updated: February 5, 2026
You can also visit our Manuals & Downloads page to browse all available resources.
Items shown below reflect what normally comes in the box for each kit and may vary during certain promotion schedules.
Royal Flush 2 ECU (x1)
Royal Flush Throttle Body (x1)
Your choice of a handheld or bluetooth device (x1)
Royal Flush 2 Main Harness (x1)
Royal Flush 2 Sub-Harness (x1)
4.9 WBO2 Sensor (x1)
Coolant Temp Sensor (x1)
USB CAN Cable (for laptop software) (x1)
Additional Accessories Pack (x1)
If the Shoe (throttle body) Fits.
Computing Power
Plug 'n' Play
Boost it, baby!
How do I set up and program my system?
Interface Options
Our EFI systems are self-learning for most stock-to-mild engine builds. You’ll use one of the included interface modules (depending on the option selected at purchase) to complete the initial setup and make adjustments on the fly. The startup wizard will prompt you with 6–12 setup questions, after which the self-learn feature takes over.
Additional fine-tuning may be required later, depending on your specific build.
Bluetooth Module
Compatible with Android and iOS devices and plugs into the CAN connection on the main harness.
5" Handheld (3rd Gen)
- Capacitive touch screen
- 64-bit processor
- 1280x720 resolution
- Cable connection via main harness
8" Handheld (1st Gen)
- Capacitive touch screen
- 64-bit processor
- 1280x800 resolution
- Wifi chip for software updates via the internet
- Cable connection via main harness
Most common questions
Quick answers to our most common queries for this product.
The Royal Flush 2 EFI/CDI Standalone System are designed to work with any classic 4, 6, or 8 cylinder engine that is under 650 hp, uses a 4150 style flange, and has a fuel system rated for EFI (43 PSI).
The self learn will work for most stock-mild builds, while some mild and more advanced builds may require manual tuning.
The Royal Flush 2 EFI/CDI Standalone System are designed to work with most stock or aftermarket ignition components. They will work with most tachometers and are compatible with Dakota Digital dashes using their Aces BIM Module (BIM-EFI-1).
Self-tuning is a common term used among aftermarket EFI companies, but we prefer the term "self-learning" as that is more accurate, even for our competitors who advertise "self-tuning."
Our systems are designed to self-learn the fuel MAPs and work best for stock-mild builds. Some mild builds and anything beyond that would require manual tuning, of which the system is fully capable. Additional features like nitrous and boost are also considered beyond stock and require manual adjustments to enable and configure these kinds of features.
Yes! You can make many changes using the Bluetooth or handheld interface, and we also offer a free PC app for more advanced tuning.
The Royal Flush 2 EFI/CDI Standalone System can work with standard stock or aftermarket ignition components, but if you want to run timing control, it will need either a magnetic pickup distributor that has been locked out or a Hall Effect distributor. You will also need to make sure that your fuel delivery system can support 43-58 PSI. Whether or not you need a return line will depend on your fuel delivery system and if the regulator is inside or outside the tank. Whether or not you need to replace your tank will depend on which fuel delivery system you choose. We offer complete Master Kits for each EFI system that come with new ignition components and a fuel delivery system. You can visit the Royal Flush Master Kits page here.
Yes to both! The Royal Flush 2 EFI/CDI Standalone System are compatible with both blow-through, draw-through, and nitrous applications and are also compatible with E85 Fuels. The Royal Flush 2 EFI/CDI Standalone System' MAP sensor can be scaled for up to 26 lbs of boost and can be set to retard timing.
Note that for boost, the system is compatible, but cannot control the boost. You will need to use a separate controller for things such as wastegate control or solenoid activation. Use of these features will require manual tuning.
Built by the Aces community
Customer Builds
See how Aces customers are using this EFI system in real-world builds.
No customer builds match that product.
Royal Flush
Aaron Demers
Check out Aaron Demers’ ‘93 LX running a Royal Flush! This is on his son’s car with original paint and interior. They are both trying to push the car into the 10s, and they are hoping the Royal Flush + 150 shot of nitrous will do just that! Be sure to check it out, and thanks again Aaron for sending in the pictures and video.
Aaron Demers
Royal Flush
View build
Royal Flush
Jason Kochenour
More than a restoration, this car is a tribute to time spent, lessons learned, and a father’s lasting impact. Thank you for sharing your story with us Jason Kochenour.
Jason Kochenour
Royal Flush
View build