Holley Sniper 550-510 EFI 4150 4-Barrel Self-Tuning Base Kit

Description

Features a throttle body mounted ECU, It is capable of supporting up to 650 HP, Designed to be a direct carburetor replacement, Will fit single and dual plane intake manifolds, Includes a built in pre-set fuel pressure regulator
Holley Sniper 550-510 EFI 4150 4-Barrel Self-Tuning Base Kit
Sku # 425550510
Mfr. Part # 550-510
Condition
New
Brand
Holley Sniper
Sold
Each
Details
Info
Put an end to mysterious air/fuel ratios, jet changes, and cold-start rough idle troubles with Holley Sniper EFI. Affordable aftermarket fuel injection is here and it couldn't be any easier to install on your vehicle. Holley Sniper EFI is a perfect match for any muscle car, classic truck, street rod, or nearly any other carbureted vehicle. Economically priced to save your hard earned money for other parts of your build; Holley Sniper EFI is a self-tuning, plug and play fuel injection system that takes all the trouble and guesswork out of your switch to modern electronic fuel injection. With over 100 years of building quality fuel systems, you can trust Holley Sniper with all your electronic fuel injection needs!
Holley Sniper EFI is packed with all the features that your car or truck needs. This throttle body fuel injection replaces any square bore or spread bore style 4-barrel carburetor. The built in ECU keeps the wiring neat and tidy with no need to run the computer and associated wiring back into the cab of the vehicle. Connect the 4 necessary wires and you're good to go. The self-learning ECU takes care of setting the baseline tune while the full touchscreen display allows you to fine tune as you please. Sniper EFI throttle bodies utilize OEM style TPS and IAC modules for dependable and serviceable use. Life is too short to hassle with cold start issues, hesitations, flooding, and carburetor inconsistencies. Leave that old 4-barrel to rest and bring in a new era of performance, reliability, and fun with a Holley Sniper EFI system!
Direct carburetor replacement
Fits single and dual plane intake manifolds
Naturally aspirated applications only
Throttle body mounted ECU - no extra computers to mount or relocate
Capable of supporting up to 650 HP
Simple, 4 wire connection (Battery +, Battery -, Switched ignition & RPM)
Built in pre-set fuel pressure regulator
Integrated ignition timing control & coil driver
Color touchscreen for easy setup and gauge displays
Self tuning ECU means you dont have to be a computer/tuning expert to enjoy EFI
Chrome finish
Sold individually
Charts
(PDF)
(PDF)
(PDF)
WARNING: Cancer and Reproductive Harm -- p65Warnings.ca.gov
California Customers: This part has been identified as emissions sensitive and can only legally be installed on race-use only vehicles, off-road-use only vehicles, or pre-1965 vehicles in the State of California in accordance with the California Air Resource Board (CARB) requirements. Once your order is placed you will be contacted by Speedway Motors within 2 business days so that you can certify that you will only use such parts on these types of vehicles in California.
Specs
Finish
Polished
Sold in Quantity
Kit
CFM
800 CFM
Carburetor Flange Type
4-Barrel Square Bore
Injection Style
Throttle Body
Metering Style
Speed density
Intake Manifold Included
No
Throttle Body Included
Yes
Distributor Included
No
Wiring Harness Included
Yes
EGR
No
Fuel Pump Included
No
Injectors Included
Yes
Fuel Rails Included
No
Calibration Module Included
Yes
TPS Sensor Included
Yes
IAC Motor Included
Yes
ECM Included
Yes
Fuel Pressure Regulator Included
No
MAP Sensor Included
Yes
IAT Sensor Included
Yes
Venturi Quantity
4
MFG. Part #
550-510
Self Tuning
Yes
GTIN Code
090127739860
Throttle Body Barrels
4-Barrel
Throttle Body Material
Cast Aluminum
Throttle Body Finish
Polished
User Tunable
Yes
Injector Size
100 lbs./hr.
Use with Power Adder
No
Max Horsepower Rating
650
Reviews
Good so far.
Rated
by Marty on August 03, 2021
Summary:
I love the product and it's a plus for my application. I hope that Holley would support more types of transmissions to use with the Sniper EFI. Thanks
Yes, I recommend this product.
Yes I would buy this product again
Rated
by Ding on October 15, 2020
Summary:
Excellent product and excellent service getting it to me
I will be putting one on my next build for sure.
Rated
by Larry on August 31, 2020
Summary:
VAST improvement in performance. I will be putting another one on my new build.
Yes, I recommend this product.
Good EFI unit if installation is right - Better than Fitech
Rated
by MLRTYME on August 05, 2020
Summary:
SBC 355, mild cam, K5 Blazer. I had installed a FiTech unit and it lasted 5 weeks before dying. I decided to go with the Holley instead of risking that issue again. I can say that the Holley system starts better and has better idle characteristics than the FiTech. I had a much easier time setting the IAC/Throttle needs (where the FiTech struggled with this). I also had the built-in fuel regulator showing a proper PSI value, where the FiTech was set low (with no way to adjust this). System is recommended...with a few caveats: 1- The Holley system comes with pre-wired fuses and relays that you can mount to your firewall. Since I had spent time/money working to get my engine compartment setup to have a clean firewall w/ no exposed wires, I worked to integrate the Sniper into my Painless wiring harness. The documentation shows the small blue wire to activate the fuel pump relay as 12v positive. It is not. It is a ground-activated relay. I had no fuel pump until I realized this (by closely reviewing the included Holley wiring and talking with Holley tech). Once I swapped the wiring in my relay at the fuseblock to have the Holley feed the ground, system works well. I'll take this weekend to properly encase the currently exposed wiring during my initial test efforts. 2- The Sniper spaces out the throttle linkage further away from the unit than any Holley carb or other fuel management system I've worked with. Due to this, I was not able to bolt on my FAST throttle cable bracket system, as it was hitting the throttle linkage. I ended up going to my local hardware store to grab some aluminum angle to build 2 brackets that "extend" the mounting points out far enough to clear the Sniper throttle linkage. If you use the Holley kit, it will work...but I've never liked the single-bolt brackets. I prefer the more solid functionality of the brackets that mount to the front/rear carb mounting studs. Be prepared to do a little bit more work if you have a similar bracket.
Cons:
Documentation unclear for fuel pump relay wiring
Throttle linkage required custom bracket work
Pros:
Built-in pressure regulator preset correctly
Provides dedicated tach output
Start up and idle characteristics are good
Yes, I recommend this product.
Holley Sniper EFI is amazing!
Rated
by Matt on April 28, 2020
Summary:
Installed the system on a '68 Camaro with probably a little too large of a cam in a 327. I have owned the car over 20 years and it has always had driveability issues such as dropping 300 rpm when put into gear, hesitation from idle, choke never worked right, fouling spark plugs when running the A/C, and the tune was constantly changing. As soon as I installed the system and answered a few questions it fired right up and ran better than it ever had when cold. As it warmed up and began to learn, it just kept running better and better! It is still learning, but I can tell you that the idle is always what its set at regardless if its in gear or not, and if the A/C is on or not. I did choose to go with the Sniper in-tank fuel pump module that is self regulating rather than the master kit with the external pump.
Yes, I recommend this product.
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Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 69 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.
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