Before we get started, we'd be amiss if we didn't introduce ourselves. If you've been following us for some time and already know a little about us, feel free to skip directly to the shopping guide below. Whether you're a long-time stalker or this is the first time you're hearing of Aces, either way, we hope you become a lifelong fan. So who is the company behind the golden spade and why should you bet on them?
We're Aces Fuel Injection, but our close friends just call us Aces. We're a technology-inspired company driven by the desire to bring about the most affordable and dependable automotive products for the people. Our company of almost 80 employees makes up our Warehouse, Customer Support, Sales, Marketing, Engineering, and a host of other wonderful teams that work closely together to make the magic happen.
While we've continued to offer more and more product categories over time, our bread and butter is EFI, and specifically, the technology behind it. With over 30% of our staff being Engineers, we're constantly working behind the scenes to improve our current product features. But it doesn't stop there, we try to go beyond that by expanding their capabilities as well. And the best part about it? More than 80% of our features and capabilities released in the last 2 years have been shared with our customers at no extra cost.
We plan for the future when it comes to the overall hardware of each system. We want the physical product to last a long time, and we want the software and functionality to be upgradeable as much as possible too. While we do offer “pro” versions of many systems that customers are able to purchase, our goal is to give our customers the absolute best value for their money both in the short and long run so that they can look back and be proud that they bet on Aces.
But this begs the question that many first-time buyers have; "if it's so cheap, is it also cheap?" Let's face it, we're all familiar with clearance items, budget builds, and dollar store items which are "cheap" and break after only a short while. So is Aces just the Harbor Freight of EFI? (No hate to HF, we literally buy half of our tools there). The answer is no. Affordability does not equal low quality. And converse to your local clearance rack, affordability does not mean we are going out of business or discontinuing a product line.
So what's the catch then? Why are we so affordable? Well, if you guessed “it's because they don't want to price gouge people and they can accomplish that while maintaining good profit margins” then you'd be dead on. Here's the deal; cars are our passion and chances are if you're reading this, cars are also your passion (or maybe because you were looking for Harbor Freight and clicked the wrong link. Here's a link back to that Google search here). If we're all passionate about cars, then like any true car enthusiast, helping someone else out with their car project is one of the most rewarding things for us.
Because of that, we don't want someone to have to spend their whole paycheck with us if they don't have to. We want our customers to be able to finish their car projects and achieve their car dreams without breaking the bank. And if you're a real auto enthusiast, you'll likely have another car project coming up soon and the wife may kill you if you blow yet another paycheck on it. That's right, we're looking out for you like that.
In all seriousness. We're glad you're here, and we hope you're here to stay. We know we are, and we hope we can be a part of your automotive journey. You can read more about our company by clicking here, but for now, let's help you find the right product for your application below.
Which System is Right for Me?
While you may be used to searching for a product based on the year/make/model of your vehicle, when it comes to our EFI systems, we are able to utilize a slightly different and somewhat more versatile approach. If you still aren't sure about which system is right for you or have any questions after reading this, please don't hesitate to reach out to us!
Step 1: Identify Your Engine Type
Classic Engines vs Modern Engines: If you have a “classic” engine that uses a distributor, or an engine that had/has stock EFI that is before the 90s, click on the "Classic engines" tab. If you have a “modern” engine that uses coil packs instead of a distributor and coil, click on the "Modern Engines" tab.
Classic Engine Options
For Classic Engines, we offer Throttle Body Injected (TBI) and Multi-Port (MPEFI) systems. Heres a quick comparison between those two styles before we list the ones we offer so you can choose the style that best suits your application:
TBI Vs. MPEFI
Specs | TBI | MPEFI |
---|---|---|
Injector Location | In the throttle body | In the intake ports |
# of Injectors | 2-4 | 8 |
Injector Flow Rate | 65-100 lb/hr | 36-220 lb/hr |
HP Limits | 350 (2-bbl), 650 (4-bbl) | Minimum 175, Max depends on throttle body/injectors |
Distributor Compatibility | Multiple distributor options | Uses a 7+1 Hall Effects distributor |
Tunability | Lesser customization (still a lot) | Greater customizability |
Expandability | Fixed size for injectors, throttle body, and internal fuel rails | Can upgrade to larger injectors, throttle body, and fuel system |
# of O2 Sensors | 1 | 2 |
General Pros | - Affordability - Ease of install - Retro Look |
- Greater tunability - Higher HP Limits - Sequential Injection |
Aces TBI Systems for Classic Engines
Specs | Deuces Wild | Killshot Classic | Killshot | Royal Flush |
---|---|---|---|---|
Bbl and CFM | 2-bbl, 500 | 4-bbl, 1,000 | 4-bbl, 1,000 | 4-bbl, 1,000 |
# of Injectors | 2 | 4 | 4 | 4 |
Injector Flow Rate | 100 lb/hr | 65 lb/hr | 100 lb/hr | 100 lb/hr |
Flange Size | 2300 | 4150 | 4150 | 4150 |
HP Max | 350 | 450 | 650 | 650 |
Minimum Recommended HP | 140 | 125 | 175 | 175 |
Built in CDI? | - | - | - | ✅ |
The Deuces Wild is a 2-bbl system with a 2300 style flange designed for 4-6 cylinder engines in the 140-350 hp range. It is usually compatible with stock ignition, but it's recommended to use a locked out magnetic distributor or a hall effects distributor and separate coil with it so you can run timing control.
Our application recommendations:
- Stock-mild engines that meet the specs listed (using self-learn functionality) or more aggressive engines (using the tuning software and manually tuning it)
The Killshot Classic is a 4-bbl system with a 4150 style flange designed for 6-8 cylinder engines in the 125-450 hp range. It is designed to work with stock ignition systems and designed for generally stock applications.
Our application recommendations:
- Stock engines that meet the specs listed (using self-learn functionality)
The Killshot is a 4-bbl system with a 4150 style flange designed for 6-8 cylinder engines in the 175-650 hp range. It is usually compatible with stock ignition, but it's recommended to use a locked out magnetic distributor or a hall effects distributor and separate coil with it so you can run timing control.
Our application recommendations:
- Stock-mild engines that meet the specs listed (using self-learn functionality) or more aggressive engines (using the tuning software and manually tuning it)
The Royal Flush is a 4-bbl system with a 4150 style flange designed for 6-8 cylinder engines in the 175-650 hp range. It's recommended to use a locked out magnetic distributor or a hall effects distributor and separate coil with it so you can run timing control. The Royal Flush also has CDI functionality to create more spark energy, launch control, rev limiter, and a few additional tuning features that come with CDI.
Our application recommendations:
- Stock-mild engines running high boost pressure or have very high compression that meet the specs listed (using self learn functionality) or more aggressive engines (using the tuning software and manually tuning it).
Aces MPEFI Systems for Classic Engines
Specs | Wild Card | The Joker |
---|---|---|
True sequential injection? | 2-bbl, 500 | 4-bbl, 1,000 |
Individual cylinder trim? | 2 | 4 |
8 Injectors? | ✅ | ✅ |
Self-learning? | ✅ | ✅ |
Standalone system compatibility | Classic 8-cyl. engines using a 7+1 Hall effects distributor | Classic 8-cyl. using a 7+1 Hall effects distributor |
Aces Top End & Master Kit system compatibility | SBF 302, 351W, SBC 350, & BBC | SBF 302, 351W, SBC 350, & BBC |
Built in CDI? | - | ✅ |
Built in rev limiter? | - | ✅ |
Built in launch control? | - | ✅ |
The Wild Card is a sequential EFI system designed for classic 8 cylinder engines and uses a 7+1 Hall Effects distributor.
Our application recommendations:
- 8 cylinder engines where you want to get more tunability and top-end performance than you would a TBI system.
The Joker is a 4-bbl system with a 4150 style flange designed for 6-8 cylinder engines in the 125-450 hp range. It is designed to work with stock ignition systems and designed for generally stock applications.
Our application recommendations:
- 8 cylinder engines running high boost pressure or that have very high compression and where you want to get more tunability and top-end performance than you would from a TBI system.
Modern Engine Options
For Modern Engines, we offer Throttle Body Injected (TBI) and Multi-Port (MPEFI) systems. Heres a quick comparison between those two styles before we list the ones we offer so you can choose the style that best suits your application:
TBI Vs. MPEFI
Specs | TBI | MPEFI |
---|---|---|
Injector Location | In the throttle body | In the intake ports |
# of Injectors | 2-4 | 8 |
Injector Flow Rate | 65-100 lb/hr | 36-220 lb/hr |
HP Limits | 350 (2-bbl), 650 (4-bbl) | Minimum 175, Max depends on throttle body/injectors |
Distributor Compatibility | Multiple distributor options | Uses a 7+1 Hall Effects distributor |
Tunability | Lesser customization (still a lot) | Greater customizability |
Expandability | Fixed size for injectors, throttle body, and internal fuel rails | Can upgrade to larger injectors, throttle body, and fuel system |
# of O2 Sensors | 1 | 2 |
General Pros | - Affordability - Ease of install - Retro Look |
- Greater tunability - Higher HP Limits - Sequential Injection |
Aces TBI & MPEFI systems for Modern Engines
Specs | Jackpot TBI | Jackpot LS (Lite) | Jackpot LS | Jackpot LS Pro | Jackpot LT | Jackpot Hemi | Jackpot Hemi Pro |
---|---|---|---|---|---|---|---|
EFI Style | TBI | MPEFI | MPEFI | MPEFI | MPEFI | MPEFI | MPEFI |
24x & 58x compatible | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
Boost Compatible | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
Drive-by-cable | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
Drive-by-wire | 🚫 | 🚫 | ✅ | Select variants | 🚫 | 🚫 | Select variants |
# of O2 sensors | 1 | 1 | 2 | 2 | 2 | 2 | 2 |
Transmission Control for GM 4-speed | Select variants | Select variants | 🚫 | Select variants | 🚫 | 🚫 | Select variants |
Ok, so you know what style of EFI and product series to choose. What kind of kit do you need?
For any EFI system, we typically offer four different bundle or "kit" options to choose from, each designed for specific scenarios and preferences. The four options are:
- Standalone Kits
- Fuel Kits
- Top End Kits
- Master Kits
Any kit options besides the standalone version saves you roughly 5% on all components combined, so you can bundle and save!
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Includes the ECU, Handheld, harness, basic sensors, and more!

Includes a standalone kit plus a fuel delivery system of your choice.

Includes a standalone kit plus a manifold, fuel rails, throttle body & injectors.

Includes a top end kit plus a fuel delivery system of your choice.
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Do your systems self-tune or self-learn?
We prefer the term “self-learn.” Our systems won't self-tune per se as “tuning” is something much more advanced and not something that should be left to computers…yet. However, our systems do use our proprietary advanced fuel learning strategies that help the system to self-learn based on one of many base tunes that are loaded into the software. Depending on the settings you choose for your engine when you go through the startup wizard, the system will choose a tune to work off of and then the self-learning strategy will kick in once the engine gets up to temperature and goes into closed loop mode. On stock-mild tunes, you should not have to adjust many settings as the self-learn strategy will be able adjust on it's own. (This doesn't negate a good install and a sound engine).
What do we define as stock-mild?
In general, the following parameters are what we consider to be the upper limits of the mild range. Anything beyond this would be considered more aggressive and not something that self-learn is capable of adjusting adequately for and would need manual tuning in order to run well:
- Valve Lift: 0.400"-0.500"
- Intake Duration (@0.050"): 200º-220º
- Exhaust Duration (@0.050"): 210º-230º
- Lobe Separation Angle: 110º-114º
What do I need to run your EFI systems?
For Carburetor/stock EFI to EFI Conversions on classic engines:
- EFI System compatible with your application
- Fuel Delivery System capable of supporting a minimum of 42 PSI
- Distributor that is or can be locked out and separate ignition coil (if you want to run timing control).
- For stock applications under 450 HP, you can just use your stock ignition if paired with the Killshot Classic.
- Note that our MPEFI systems require a 7+1 Hall effects distributor in work.
For Engine swaps using LS, LT, or Hemi engine platforms:
- Jackpot EFI system (TBI and MPEFI options available)
- System is compatible with stock coils
- Fuel Delivery System capable of supporting a minimum of 42 PSI
*Does not support DOD or VVT.
Will I need a return line?
This depends on the fuel system you use and subsequently where the regulator is placed. A return fuel line would typically branch off of the fuel regulator and it functions to return the excess fuel to the tank to be recirculated again. We have several different fuel delivery kit options available and all but one require a return fuel line. If the regulator is external from the tank, then a return line is necessary, but if the regulator is inside the tank (the main tank, not a surge tank) then no return line is necessary since the fuel will just flow out of the regulator and fall into the tank since the regulator is inside it.
Surge tank style fuel delivery kits typically have a regulator built into them, but because the mechanical pump is still feeding fuel into the surge tank, there needs to be a return line from the surge tank to return excess fuel back to the tank that the mechanical pump draws from.
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