Killshot Fusion
4-bbl TBI system with an internal ECU for classic engines up to 650 hp
Killshot Fusion EFI System
3-Year Warranty
30-Day Returns
Secure Payment
Kit Types Explained
Bundle & Save!
Save 5% automatically when you purchase a Fuel Kit, Top End Kit, or Master Kit!
- 1. Standalone Kits
Perfect if you already have a high pressure fuel system (43 PSI+) and want to use your stock ignition or if you already have an aftermarket distributor. (Note that a distributor must be locked out to run timing control.)
- Includes the following:
- Throttle body
- ECU
- Handheld or Bluetooth Module
- Full Harness
- Sensors
- Accessories
- 2. Fuel Kits
Perfect if you want to use your stock ignition or if you already have an aftermarket distributor. (Note that a distributor must be locked out to run timing control.)
- Includes the following:
- A complete Standalone Kit
- A Fuel Delivery System of your choosing
- 3. Top End Kits
Perfect if you already have a high pressure fuel system (43 PSI+) and want to run timing control.
- Includes the following:
- A complete Standalone Kit
- A Magnetic Distributor of your choosing
- An AC2008 Ignition Coil
- 4. Master Kits
These include everything you need to go from carb to EFI and run timing control.
- Includes the following:
- A complete Standalone Kit
- A Fuel Delivery System of your choosing
- A Magnetic Distributor of your choosing
- An AC2008 Ignition Coil
Engineered Precision. Integrated Simplicity. Real-World Durability.
The Killshot Fusion is the next evolution in throttle body EFI systems. Building upon the success of the original Killshot, the Fusion takes everything users loved, robust hardware, accurate fuel delivery, and ease of tuning, and reimagines it with a fully integrated design that eliminates clutter, simplifies installation, and dramatically boosts reliability. The Fusion differs from the original Killshot in that it houses the ECU within the throttle body, cutting down on cost, labor time, and complexity, so that you can get back out on the open road that much faster.
Core Features
- 10x14 VE, Fuel, and Spark Tables
- Built-in Sensors – MAP, TPS, IAT, and 4.9 Wideband O2 included
- Self-Learning Capability and full tuning: Let the system learn as you drive or tune manually for high performance applications
- Supports up to 650 HP Naturally Aspirated
- Four 100 lb/hr fuel injectors per throttle body
- 3-bar TMAP Sensor – Supports up to 27 psi boost
- TPS Output – For transmission controllers, nitrous activation, and more
- Compatible with all 4150-flange 4-barrel intake manifolds
Whether you’re upgrading from a carburetor or stepping up from a basic EFI system, the Killshot Fusion gives you everything you need to fuel, tune, and dominate with confidence. It’s the perfect solution for serious builders who want the reliability of modern EFI with the power and simplicity of a throttle body system.
Simplicity, affordability and power: that’s the kind of combination you can only get by betting on Aces.
Product Info
Overview
Engineered Precision. Integrated Simplicity. Real-World Durability.
The Killshot Fusion is the next evolution in throttle body EFI systems. Building upon the success of the original Killshot, the Fusion takes everything users loved, robust hardware, accurate fuel delivery, and ease of tuning, and reimagines it with a fully integrated design that eliminates clutter, simplifies installation, and dramatically boosts reliability. The Fusion differs from the original Killshot in that it houses the ECU within the throttle body, cutting down on cost, labor time, and complexity, so that you can get back out on the open road that much faster.
Core Features
- 10x14 VE, Fuel, and Spark Tables
- Built-in Sensors – MAP, TPS, IAT, and 4.9 Wideband O2 included
- Self-Learning Capability and full tuning: Let the system learn as you drive or tune manually for high performance applications
- Supports up to 650 HP Naturally Aspirated
- Four 100 lb/hr fuel injectors per throttle body
- 3-bar TMAP Sensor – Supports up to 27 psi boost
- TPS Output – For transmission controllers, nitrous activation, and more
- Compatible with all 4150-flange 4-barrel intake manifolds
Whether you’re upgrading from a carburetor or stepping up from a basic EFI system, the Killshot Fusion gives you everything you need to fuel, tune, and dominate with confidence. It’s the perfect solution for serious builders who want the reliability of modern EFI with the power and simplicity of a throttle body system.
Simplicity, affordability and power: that’s the kind of combination you can only get by betting on Aces.
Specs
Killshot Fusion EFI System Specifications
| Specification | Value |
|---|---|
| Accelerometer Support | No |
| Air Cleaner Diameter | 5" |
| Air Inlet Location | Center top |
| Basic Operating RPM Range | Up to 8,000 RPM |
| Boost Compatible | Yes |
| Boost Control | No |
| CAN-BUS Support | Yes (Aces) |
| Category | Electronic Fuel Injection |
| CFM | 1,000 |
| Coil Per Cylinder Ignition Support | No |
| Color | Black, Gold, or Polished |
| Datalogging Support | Yes |
| Distributor Included | Only in Top End & Master Kits |
| Dry Nitrous Compatibility | No |
| Dry Nitrous Control | No |
| E85 Support | Yes |
| EFI Type | Throttle Body Injection (TBI) |
| EGT Support | Yes (Aces) |
| Emission Code | 3 |
| Engine | Utilizes a 4150 style flange. Not specific to any one engine. |
| Finish | Powder coating for Black or Gold. Polished finish |
| Flange Style | 4150 |
| Forced Induction Support | Yes |
| Fuel Filter Included | Only in Fuel Kits & Master Kits. |
| Fuel Hose Included | Only in Fuel Kits & Master Kits. |
| Fuel Injectors Included | Yes. (4) 100 lb/hr injectors which are built in. |
| Fuel Pressure Regulator Included | Only in Fuel Kits & Master Kits. |
| Fuel PSI Required | 42-48 PSI. 60 PSI Max. |
| Fuel Pump Included | Only in Fuel Kits & Master Kits. |
| Fuel Rail(s) Included | Not applicable to TBI style systems. |
| Fuel System Type | Depends on selection and only in Fuel Kits & Master Kits. |
| Gasket Or Seal Included | Yes |
| Gasket Type | Fiber |
| Grade Type | Performance |
| Handheld Included | Yes, except in Bluetooth Module only variants |
| Handheld MCU Architecture | 64-bit |
| Idle Air Control Motor Included | Yes, built-in. |
| Ignition Timing Control | Yes |
| Ignition Compatibility | Most stock, CDI, magnetic, hall effect, or points style distributor. |
| Individual Cylinder Fuel Corrections | No |
| Injector Connector | EV1 (internal) |
| Injector Quantity | 4 |
| Injector Size | 100 lb/hr |
| Intake Manifold Included | No |
| Knock Retard Support | No |
| MAP Sensor | 3 Bar |
| MAP Sensor Included | Yes, built-in. |
| Material | Cast Aluminum (throttle body) |
| Maximum Horsepower Supported | 650 Naturally Aspirated |
| MCU Architechture | 32-bit ST56 Power PC |
| Minimum Horsepower Supported | 150 |
| Mounting Hardware Included | Yes |
| Multi-Stage Nitrous Control | No |
| Nitrous Bung(s) Included | No |
| Product Type | Electronic Fuel Injection System |
| Progressive Nitrous Control | No |
| Recommended Use | Stock to Mild applications for best results |
| Self-Learning | Yes, for stock-mild setups |
| Sequential Injection | No |
| Single Or Dual Plane Type | Compatible with either |
| Throttle Body Bore Diameter | 42.8mm |
| Throttle Body Height | 3.46" |
| Throttle Body Included | Yes |
| Throttle Position Sensor Included | Yes, built-in |
| Transmission Control | Not included |
| WBO2 Sensor | 4.9 Wideband |
| WBO2 Sensor Included | Yes, one. |
| User-Tuneable | Yes |
| Wet Nitrous Control | No |
Resource Documents
For additional manuals, diagrams, measurements, and more, check out our documents page in our Resource Center by clicking here.
What's in the box?
Engineered Precision. Integrated Simplicity. Real-World Durability.
The Killshot Fusion is the next evolution in throttle body EFI systems. Building upon the success of the original Killshot, the Fusion takes everything users loved, robust hardware, accurate fuel delivery, and ease of tuning, and reimagines it with a fully integrated design that eliminates clutter, simplifies installation, and dramatically boosts reliability. The Fusion differs from the original Killshot in that it houses the ECU within the throttle body, cutting down on cost, labor time, and complexity, so that you can get back out on the open road that much faster.
Core Features
- 10x14 VE, Fuel, and Spark Tables
- Built-in Sensors – MAP, TPS, IAT, and 4.9 Wideband O2 included
- Self-Learning Capability and full tuning: Let the system learn as you drive or tune manually for high performance applications
- Supports up to 650 HP Naturally Aspirated
- Four 100 lb/hr fuel injectors per throttle body
- 3-bar TMAP Sensor – Supports up to 27 psi boost
- TPS Output – For transmission controllers, nitrous activation, and more
- Compatible with all 4150-flange 4-barrel intake manifolds
Whether you’re upgrading from a carburetor or stepping up from a basic EFI system, the Killshot Fusion gives you everything you need to fuel, tune, and dominate with confidence. It’s the perfect solution for serious builders who want the reliability of modern EFI with the power and simplicity of a throttle body system.
Simplicity, affordability and power: that’s the kind of combination you can only get by betting on Aces.
Killshot Fusion EFI System Specifications
| Specification | Value |
|---|---|
| Accelerometer Support | No |
| Air Cleaner Diameter | 5" |
| Air Inlet Location | Center top |
| Basic Operating RPM Range | Up to 8,000 RPM |
| Boost Compatible | Yes |
| Boost Control | No |
| CAN-BUS Support | Yes (Aces) |
| Category | Electronic Fuel Injection |
| CFM | 1,000 |
| Coil Per Cylinder Ignition Support | No |
| Color | Black, Gold, or Polished |
| Datalogging Support | Yes |
| Distributor Included | Only in Top End & Master Kits |
| Dry Nitrous Compatibility | No |
| Dry Nitrous Control | No |
| E85 Support | Yes |
| EFI Type | Throttle Body Injection (TBI) |
| EGT Support | Yes (Aces) |
| Emission Code | 3 |
| Engine | Utilizes a 4150 style flange. Not specific to any one engine. |
| Finish | Powder coating for Black or Gold. Polished finish |
| Flange Style | 4150 |
| Forced Induction Support | Yes |
| Fuel Filter Included | Only in Fuel Kits & Master Kits. |
| Fuel Hose Included | Only in Fuel Kits & Master Kits. |
| Fuel Injectors Included | Yes. (4) 100 lb/hr injectors which are built in. |
| Fuel Pressure Regulator Included | Only in Fuel Kits & Master Kits. |
| Fuel PSI Required | 42-48 PSI. 60 PSI Max. |
| Fuel Pump Included | Only in Fuel Kits & Master Kits. |
| Fuel Rail(s) Included | Not applicable to TBI style systems. |
| Fuel System Type | Depends on selection and only in Fuel Kits & Master Kits. |
| Gasket Or Seal Included | Yes |
| Gasket Type | Fiber |
| Grade Type | Performance |
| Handheld Included | Yes, except in Bluetooth Module only variants |
| Handheld MCU Architecture | 64-bit |
| Idle Air Control Motor Included | Yes, built-in. |
| Ignition Timing Control | Yes |
| Ignition Compatibility | Most stock, CDI, magnetic, hall effect, or points style distributor. |
| Individual Cylinder Fuel Corrections | No |
| Injector Connector | EV1 (internal) |
| Injector Quantity | 4 |
| Injector Size | 100 lb/hr |
| Intake Manifold Included | No |
| Knock Retard Support | No |
| MAP Sensor | 3 Bar |
| MAP Sensor Included | Yes, built-in. |
| Material | Cast Aluminum (throttle body) |
| Maximum Horsepower Supported | 650 Naturally Aspirated |
| MCU Architechture | 32-bit ST56 Power PC |
| Minimum Horsepower Supported | 150 |
| Mounting Hardware Included | Yes |
| Multi-Stage Nitrous Control | No |
| Nitrous Bung(s) Included | No |
| Product Type | Electronic Fuel Injection System |
| Progressive Nitrous Control | No |
| Recommended Use | Stock to Mild applications for best results |
| Self-Learning | Yes, for stock-mild setups |
| Sequential Injection | No |
| Single Or Dual Plane Type | Compatible with either |
| Throttle Body Bore Diameter | 42.8mm |
| Throttle Body Height | 3.46" |
| Throttle Body Included | Yes |
| Throttle Position Sensor Included | Yes, built-in |
| Transmission Control | Not included |
| WBO2 Sensor | 4.9 Wideband |
| WBO2 Sensor Included | Yes, one. |
| User-Tuneable | Yes |
| Wet Nitrous Control | No |
For additional manuals, diagrams, measurements, and more, check out our documents page in our Resource Center by clicking here.
650 hp
Supports up to 650 naturally-aspirated ponies
550 hp
Supports up to 550 boosted ones
Internal ECU
No room on the firewall? No problem. The Fusion's internal ECU makes for a much cleaner look under the hood. Read about our durability testing and R&D behind it here.
Minimal Wires
Designed for simplicity, the wire harness has only a few wires to connect:
- Main power
- Ground
- Key on power wire
- Fuel pump wire
- Distributor wire
Progressive Linkage
Improved throttle response on tip-in
Boost Reference Port
Better Ingredients. Better Performance.
Industrial-grade components? Never heard of her. Only automotive-grade components here. Aces only uses OEM-level components, which means better reliability and capbility.
Disco under the hood
We spent the last 5 years making sure our onboard ECU would hold up under the same conditions that plagued other companies. What better way to celebrate than with a mini rave?
If the shoe (throttle body) fits.
The Killshot Fusion uses the common 4150 style flange found on many classic engine manifolds, making it very versatile when it comes to compatibility. As long as the TBI unit fits, is within the appropriate HP range, and your engine uses a classic distributor, it's a match made in heaven...or the garage.
Videos
Product Overview
Initial Adjustments
Using Advanced Tuning Software (optional)
@acesfuelinjection
Tech Tuesday Ep. 80
Answering all of your Killshot Fusion questions.
Killshot Fusion EFI + Gambler Distributor + Tank Conversion Kit Install on a FOX BODY MUSTANG!!
@acesfuelinjection
The Killshot Fusion on Joseph's Camaro
@acesfuelinjection
Killshot Fusion — The "Out of the Box" EFI System
@acesfuelinjection
Killshot Fusion: Kat's Firebird
Video Reviews
From the People
Justin Richardson
1932 Roadster @AcesFuelInjection Killshot Fusion
Proto-Tech LLC
Bryant Stilwell
Aces EFI Fusion! Throttle Body Comparison
Nomadic Dyno
@wasatchtruckfarm
Aces EFI killshot fusion 1967 c20 Chevy
Share what your customers are saying about your products, customer service or shipping rates.
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
Compare
What's the Difference?
Killshot Lite?
Killshot Fusion?
Killshot 2 Pro Max Plus Ultra Wideband 4K?????
See what makes each system unique below.
- Internal ECU
- Designed for stock-race builds under 650 hp (NA)
- External ECU
- Designed for stock-race builds under 650 hp (NA)
- Largest resolution tables (31x31)
- Dual quad compatible to support up to 1,200 hp
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).
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).
4150
4150
100 lb/hr
100 lb/hr
Yes! This works best for stock-mild builds and for anything beyond that, the system is fully tunable.
Yes! This works best for stock-mild builds and for anything beyond that, the system is fully tunable.
Yes
Yes
Internal
External
Yes
Yes
- Canister Style
- Aces Brand
- Standard Aftermarket
- Aces Brand
- Standard Aftermarket
Bundle & Save!
Save 5% when you purchase a fuel, top-end, or master kit! See the 4 different kit types that we offer below.
Standalone
Includes the following:
- Throttle body (with integrated ECU)
- Handheld or Bluetooth Module
- Full Harness
- Sensors
- Accessories
Fuel Kit
Top End Kit
Master Kit
Any TBI Standalone Kit plus:
- Any Fuel Delivery System
- Any Distributor
- An AC2008 Ignition Coil
Most common questions
Quick answers to our most common queries for this product.
The Killshot Fusion EFI System is 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 Killshot Fusion EFI System is designed to work with most stock or aftermarket ignition components. It will work with most tachometers and is 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 Killshot Fusion EFI 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 Killshot Fusion Master Kits page here.
Yes to both! The Killshot Fusion EFI System is compatible with both blow-through, draw-through, and nitrous applications and is also compatible with E85 Fuels. The Killshot Fusion EFI System's 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.
Installed the fusion master kit and it started right up. Now I just have to tune for the boost. It's a easy setup and looks nice on there.
My Aces Story: BUYER BE WARE
I purchased an Aces killshot fusion and tight tank pump module one month ago. $840. Installed per the instructions. Turned key on and it blew the fuel pump fuse. After testing with voltage meter, it turns out the fuel tank module was grounded on the positive post. Using rubber washers, I isolated the post and fixed the short to ground. Reinstalled the pump module. I noticed that even with key off, the fuel pump light was lit on the side of the throttle body. The fuel pump wire read 12.7v with key off and with key on it dropped to 2.5v on prime cycle then back to 12.7v. Talked to tech support and determined that grounded pump module shorted the fuel pump circuit on the ECM.
Sent it back for a warranty claim but change to a refund. Was refunded $566 out of my $840. So a $274 dollar lesson learned from me.
I DO NOT recommend these systems. Maybe I had bad luck but either way, I felt like people needed to hear this before they buy.
Outstanding product with good customer support. We install all the brands and we enjoyed the simplicity and simple install.
allows me to get customer vehicle back up while waiting for ECU repairs
The Killshot Fusion was very easy to install. The slimmer throttle body design allows for a wide range of air cleaner configurations, making it versatile for different setups.
Once installed and the wiring was tucked away, it blended seamlessly into the engine bay—maintaining a classic look while delivering the reliability and tunability Aces EFI is known for.
On a stock engine, I had to make little to no adjustments. I simply bolted it on, ran the Start Wizard, and was on the road the next day.
Super easy installation, everything just bolted on and plugged in with the exception of the battery + and -. With my setup, I was able to set the timing and it fired up with very little adjustments. My setup is pretty mild but I had more time messing with the Killshot 1 settings than I spent doing the entire Fusion install beginning to end. The integrated ecu is a nice touch and makes the under hood appearance much cleaner. Time will tell how it holds up, but so far so good! I will be removing this from my 1984 Cutlass and transferring it over to my wife's 1985 F150 for more testing from a non-car person's standpoint here later this year.
Hit the switch the first time and it fires right up. The old carb was junk and had to pump and prime about ten times to start but not anymore, it's a really great product. I've probably put 100 miles or so on it and it does really good!
I think the carburetor will be fine. Customer service is not. I have called 3 to 4 times. And been on the phone on hold for over a hour and no answer. I think Customer services needs to be on point! Im a business owner my self and if i didnt answer the phone or put them on hold for over a hour i would be out of business! All im
saying is do better. I have have had questions and cant anyone to answer them.
Havent put it on or test yrt but just by the sure look of it nice beefy and very well build videos soon to tik tok
The aces efi killshot is built amazing but trying to trouble shoot or get any customer service is joke this company is ridiculous for having an AI agent that can’t help you with anything and you can’t get a hold of a real person.
Won’t run , idle surges
Looks great exactly as described
All is good with the items so far im following the instructions as there easy to read. Only thing i wish was at checkout if the website had asked me if needed spakplugs and it didnt. I had to order some and this delayed my installation.
I haven't installed it yet.
I received my package cannot wait to put it on my vehicle 1978 Chevy Scottsdale C 30 small block 350
looks really nice, but customer service is lacking... cannot rate it until i get it running, cant do that until i get answers. Messaged over 2 weeks ago, but still have not received an answer from them.
Haven’t installed the system yet .But very much looking forward to when I can install it .
So far so good no instructions had to go on line to figure out which filter is which from other people but still working on setting it up
Haven't installed it yet. Im waiting for the in tank 255 fuel pump that i order separately. Cant wait till its in my 69 cutlass.
I had been Reviewing Aces for a project and had determined that I liked what I was seeing. The Black Friday deals tipped me over the edge. I work in the driveway with no building so I have an installed it yet. However, I can say the packaging is substantial and the products in each box is very high quality. The 8-in screen is a spectacular although it may be a little too tall to fit my application. I wish the dimensions ran wider and narrower.
Love the packaging, Installing it and doing some wiring probably won't be running for another month due to wiring!
EVERYTHING LOOKS GREAT BUT I WONT BE INSTALLING IT UNTIL SPRING
I bought one system worked great till the fuel pump stayed on all the time. Lack of tech support is why I gave 2 star. I had to order a second kill shot to get the customer out the door. System works great I just have an extra non working unit now and they haven’t responded to an emails or calls since nov 19th. Tech support takes an hour or more to even talk with someone. Then they ask is the 12v keyed.
Good on my 1952 Chevy.
i’ve installed many other brands this was by far the easiest and nicest quality and yet the most affordable i’m very pleased and from now on will highly recommend aces to all my customers
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