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";s:4:"text";s:22431:"On radical engines (those with cam duration over 240 degrees at 0.050 or less than 10 inches of idle vacuum), even user-programmable Speed Density systems have difficulty due to an erratic or insufficient manifold vacuum signal. Which Is Best? (Image/Summit Racing). I own a 2011 Dodge Charger R/T. Electronic fuel injection systems using MAF metering have a mass air flow sensor.The MAF sensor is typically found in the air intake tube, before the engine’s throttle body. This system doesn't measure airflow directly; instead, engine load is assumed based on throttle-angle versus engine rpm. That means it can compensate for things like ambient air temperature, altitude, and other external factors. Already, the latest Gen VII ACCEL/DFI system has the ability to construct its own baseline fuel curve, and the new user programming interface is a full-fledged, Windows-compatible program. EFI 101: Mass Air vs. The GM MAF engine management computer isn't as adaptable as Ford's. (Some vehicles even use a combination of the two.). They even incorporate self-learning capability to calibrate themselves to the perfect air/fuel mix just by driving around. Typical MAF systems also use additional sensors similar to those found in Speed Density systems. Nowadays, MAF systems are widely used on many performance applications outside of the most extreme mega-horsepower, track-only vehicles. Holley EFI systems are great in that they allow you to control numerous stages of nitrous, progressively where desired, for up to eight stages in the case of our Dominator EFI computer. This is a Speed Density type EFI system, not an Alpha-N type EFI … Today's electronic engine management systems can process millions of instructions per second to continuously adjust spark and fuel for optimum performance. Other sensors on a typical Speed Density system usually include an idle-air control motor to help regulate idle speed, a throttle-position sensor that transmits the percentage of throttle opening, a coolant-temperature sensor, and a knock sensor as a final fail-safe that hears detonation so the computer can retard timing as needed. A relatively simple design, N Alpha systems use only engine speed and throttle angle to calculate the amount of fuel needed by the engine. Speed Density Learn how your comment data is processed. If you’re researching electronic fuel injection (EFI) systems, you’ve probably come across the terms speed density and mass air flow (MAF). Holley advises this gives you the option to select from … I've seen the Procharger vs. Vortech, TFS vs. AFR, Mass air vs. The most common type of mass-flow sensor is the hot wire design: Air flows past a heated wire that's part of a circuit that measures electrical current. GM used MAF sensors on the turbo Buick V-6 Grand National, '85-'89 TPI, '94-'98 LT1, '96 LT4, and all LS1 engines. Fitech Go Street EFI= $795.00; Holley Sniper = $999.95; FAST EZ-EFI = $899.99; All three units have different prices, but offer different options and features. Holley’s HP ECU is standard equipment on the 2013/2014 Chevrolet COPO Camaro and Holley’s EFI throttle body powers every NASCAR Sprint Cup Series™ team. As you might expect from Holley there are a lot of induction "kits" that include the manifolds etc so the pisture below are more for reference than … my decision easier. I’ve lived in the speed density world for a long time and I’ll take mass air any day of the week. Speed density, Pro-M vs. PMAS, Snow Performance vs. AIS, Pro-M EMS vs. Holley and now Batman vs. SUPERMAN and the list … This also makes them incompatible with modern catalytic converters. Top racers are making the switch to Holley EFI … Once upon a time an engine needed three things to run: fuel, air, and fire. Since fitting an air intake tube and MAF sensor in a retrofitted engine bay is often difficult, many aftermarket EFI conversion kits rely on speed density systems. If your vehicle was made in, say, the last 15 years, it’s probably equipped with a MAF system. In today’s aftermarket, EFI systems are available with every component necessary to either convert from a carbureted system or build an EFI engine from the ground up. In the early days of EFI, racers preferred speed density systems because they responded better in high-rpm, high-horsepower engines and you didn’t have a MAF sensor to disrupt intake airflow. For folks looking for the reliability and driveability of EFI in an older carburetor-equipped vehicle however, speed density setups offer some advantages. The mustang stopped speed density in 1987. better make sure that joker is all the way TURNT up jack! Better still, most modern speed density systems often come with pre-loaded tunes to make them practically plug-in-and-go. They are self-compensating for most reasonable upgrades, as well as extremely accurate under low-speed, part-throttle operation. The only … MAF systems are much more flexible in their ability to compensate for engine changes since they actually measure airflow instead of computing it based on preprogrammed assumptions. Most Mopar fuel- injection systems have used Speed Density too. Engine rpm is provided via a tach … But, while common in newer vehicles, MAF systems don’t always make the best retrofits for older vehicles not originally equipped with fuel injection, simply because of the nature of the system design. Custom calibration is required, so Granatelli prefers to do the changeover in-house. The higher-end aftermarket systems, including Electromotive's, support this option. The word you’re looking for is elevation. Why settle for a junkyard ECU with a cumbersome aftermarket tuning interface when you can get complete control of your engine, self-learning fuel strategies and the proven, race winning technology of Holley EFI … Save my name, email, and website in this browser for the next time I comment. The MAF sensor's circuitry converts the current reading into a voltage signal for the computer, which in turn equates the voltage value to mass flow. Easy to tune, great drivability and response, and a simple all inclusive bolt-on kit that works. Terminator X and Terminator X Max. Now, the air intake information provided by the MAF sensor isn’t the only data the ECU uses to makes its fuel delivery computations—it will pull in data from other sensors to account for engine speed, temperature, exhaust flow, etc. If the VE/Speed-Density table is off by 10%, the WBO2 correction can take care of it, but it's better to adjust the values in that area of the table by the 10%, so that the WBO2s are only correcting … Here’s a very quick, basic rundown on how each system works, so that you can better understand some terminology when you’re shopping for fuel injection systems and related components. A little … (Image/Forums.Holley.com). and run octane booster. I’ve … ... About the Holley EFI Systems. Electronic fuel injection systems using MAF metering have a mass air flow sensor. That's what carbs, coils, and distributors are for. The amount of current needed to heat the wire is proportional to the mass of air flowing across the wire. Many systems utilize a sensor in the exhaust system that allows the ECU to “check its math” and make any necessary adjustments. Nowadays, oversize MAF sensors are available from Pro-M, Granatelli Racing, and other sources that are compatible with Ford engines and computers. As electronic engine-management system usage becomes more widespread in the car crafting community, prices and ease of use should become more user-friendly. These are the two most prevalent types of fuel injection metering methods that an EFI system uses to calculate air/fuel ratio. Why the Stealth? By contrast, Mass Air Flow (MAF) systems use a sensor mounted in front of the throttle body that directly measures the amount of air inducted into the engine. Engine rpm is provided via a tach signal, while vacuum is transmitted via an intake manifold-mounted Manifold Air Pressure (MAP) sensor. I could do anything to that car, and the system would reset just by holding 2,000.rpm for one, or two minutes then let it idle until the computer relearns. It makes so much more sense - measure air going in and add fuel to get the ratio desired. One of the reasons speed density systems are so popular in the aftermarket is that they’re ideal for folks who want to switch from a traditional carbureted setup to fuel injection. Holley HP EFI systems are equipped with 4 programmable inputs and 4 programmable outputs that are ideal for most vehicles with a single power adder. Holley HP EFI systems are equipped with 4 programmable inputs and 4 programmable outputs that are ideal for most vehicles with a single power adder. They … Mass Flow GM's Tuned Port Injection (TPI) set-ups used Speed Density metering from '90-'92, as did '91-'93 LT1 engines. Speed Density Speed Density systems accept input from sensors that measure engine speed (in rpm) and load (manifold vacuum in kPa), then the computer calculates airflow requirements by referring to a much larger (in comparison to an N Alpha system) preprogrammed lookup table, a map of thousands of values that equates to the engines volumetric efficiency (VE… Speed Density N Alpha, Speed Density, and Mass Flow Metering ... (VE) under varying conditions of throttle position and engine speed. We've seen 1,000-plus-horsepower EFI'd engines happily fed by AN-8 (12-inch) lines. Current flowing through the wire heats it to a temperature that is always held above the inlet air temperature by a fixed amount. All '86-'87 and '88 non-California Ford 5.0L-HO engines used Speed Density metering. Then tonight on a video my neighbor sent me showing dyno testing using carburetor vs Holley … Because of EFI (electronic fuel injection), the Hilborn Injector has become the favorite choice for many types of motorsport enthusiasts that enjoy driving their cars on the street. On the other hand, the MAF meter, mounted as it is ahead of the throttle-body, can become an airflow restriction on high-horsepower engines. Breaking things down. Custom MAF calibration keyed to the specific vehicle, engine, and injector size is also available. The speed density system’s computer is loaded with pre-determined data tables to help it make those computations. HP EFI ECU and harness kits are designed to be used with popular factory EFI engines as an alternative to the factory ECU and harness or as a replacement for your C950 ECU. The computer regulates the electronic fuel-injector pulse width (the time that the fuel injector is open) and ignition lead with input from various sensors. This helps compensate for wear and tear and production variables. Ford has used MAF metering on '88 California 5.0L engines and all '89-and-later V-8 engines. A speed density system relies on tables like this to calculate the proper air/fuel ratio for your engine. With EFI or Carb on an LS you'll still get a leak-free engine … I’m very interested in purchasing the Holley Stealth EFI for my 427 BBC in my 67 Chevelle. If you intend to drive on the street, a system that blends N Alpha with Speed Density—varying which is in control per specific operating point and conditions—may be the answer. Holley’s Dominator can be setup to accommodate your choice of Speed Density, Alpha-N, Alpha-N Combination, and VE fueling strategies. In the past there was a problem on high-horsepower engines because larger-capacity MAF sensors were scarce and prohibitively expensive. Your email address will not be published. With a correctly calibrated oversize meter, reflashing the Ford computer usually isn't required. There's no problem with how Holley EFI performs Acceleration Enrichment. They generally do not have a closed-loop mode for air/fuel correction, resulting in part-throttle calibration that is crude at best when compared to other systems. Routing air intake tubing for mounting the MAF sensor into a manifold designed originally for a carburetor can cause space and fitment issues, which means a MAF-based EFI conversion can involve a lot of custom fabrication and additional parts. The various load-rpm points make up the computer's lookup table, with the amount of fuel needed at each point manually programmed by the tuner. Also known as a manifold absolute pressure (MAP) system, the ECU uses air pressure data and engine rpm to determine engine airflow which, in turn, is used to calculate how much fuel to send into the cylinders. However, Westech Performance reports that it is possible to use Pro-M's adjustable Optimizer MAF meter and a stock Ford Mustang computer with Ford's EPEC piggyback programmable unit to run Mass Air on any engine. Three different measurement strategies have evolved to supply the computer with this basic information; in order of sophistication they are: N Alpha, Speed Density, and Mass Flow metering. Speed Density systems accept input from sensors that measure engine speed (in rpm) and load (manifold vacuum in kPa), then the computer calculates airflow requirements by referring to a much larger (in comparison to an N Alpha system) preprogrammed lookup table, a map of thousands of values that equates to the engine's volumetric efficiency (VE) under varying conditions of throttle position and engine speed. What makes a mass airflow system appealing (and why it’s common in OE applications) is its flexibility. Anything slight you do you have to have a hand held tuner, and pray that it works. What we hear: "You will never be able to tune your EFI without a professional tuner and a dyno." (However, before you run out for a larger Ford MAF meter, Fast Track Performance points out that the first limiting factors are the puny Ford 19 lb/hr injectors, which can only support about 320 hp.). In a perfect world, virtually all street-performance engines would use Mass Air, due to its superior accuracy and greater tolerance for engine changes. For example, on a Chevy V-8 with the traditional 1-8-4 … If it is not practical to use MAF on your engine due to packaging or hardware constraints, the programmable Speed Density systems are the next best choice because production-based Speed Density systems won't tolerate major engine changes without computer reprogramming, which usually requires the services of an outside specialist; if the reprogrammer isn't specifically familiar with your combo, the end results may be less than satisfactory. Your information will be collected and used in accordance with our  Privacy Policy. Although it will accept larger MAFs, you can't go up and down more than one injector size with reflashing the computer. Air flowing across the wire draws away some of the heat, so an increase in current flow is required to maintain its fixed temperature. Many EFI engines that make over 500 hp require some type of enhanced EFI or a stand-alone engine-management system. Some oversize MAF meters have also become available for the second-generation ('94-and-later) GM MAF systems, but the selection isn't as broad as for the Ford guys. This ranges from show cars … Unless I’m missing something. One of the key things the computer needs to know is how much air the engine consumes under a given set of conditions. Two powertrain management systems from Holley that offer plug and play control for most LS engines starting at just $999. This site uses Akismet to reduce spam. The point here though is that for … Holley makes a 4bbl TBI kit, about $1400 brand new and complete. The ECU is always working to deliver the optimal fuel delivery based on the actual airflow data coming into the engine, not a pre-determined set of data tables. This feature allows the user to configure the system to support a wide range of controls including boost control, progressive nitrous, water/meth injection, speed … The HP allows you to accurately … Holley’s EFI Sytem is Dominating – Part III April 16, 2015 Wayne Scraba Drag Race 101 , Tech Tips 0 In the first issue, we examined the self-learning capability of Holley’s Dominator EFI, while … The sensor measures the air coming into the engine, and the EFI system’s computer uses that information to determine how much fuel to deliver into each cylinder.Now, the air intake information provided by the MAF sensor isn’t the only data the ECU uses to makes its fu… Just received my 331 back from the engine builder including having him put an original Ford C9OX intake on that I had for 35 plus years. Since air density changes with air temperature, an intake manifold-mounted sensor is also used. We've already been through this AE with him. If you’ve ever seen one of those EFI conversion kits with a throttle body that looks like an old-style four-barrel carburetor, there’s a good chance that it’s a speed density system. How does the MAF compensate for altitude? Speed Density — What They Are & Which is Best for Your Ride. This kit from Holley includes the intake … Unfortunately, the more-or-less affordable aftermarket systems—including ACCEL/ DFI, Speed-Pro, and Holley—are Speed Densitybased and don't support Mass Air metering. Speed density, Alpha-N, or combination fueling strategies . These systems can also rely on several other sensor inputs to home in on the optimal air/fuel mix, along with large data tables and custom ECU tuning. Speed density… But the aftermarket has stepped up, offering MAF sensors and housings optimized for improved airflow and performance. It’ll work fine in stock and most performance situations. The sensor measures the air coming into the engine, and the EFI system’s computer uses that information to determine how much fuel to deliver into each cylinder. This feature allows the user to configure the system to support a wide range of controls including boost control, progressive nitrous, water/meth injection, speed … Once the electronic control module (ECM) knows the amount of air entering the engine, it looks at these other sensors to determine the engine's current state of operation (idle, acceleration, cruise, deceleration, operating temperature, and so on), then refers to an electronic map to find the appropriate air/fuel ratio and select the fuel-injector pulse width required to match the input signals. Adding headers, cams heads etc was easy. If the application is for a race car operated primarily under full throttle, N Alpha is the solution. Can voice command be far behind? I like that it looks like a carb. I've had one, and luved it. Because a Speed Density system still has no sensors that directly measure engine airflow, all the fuel mapping points must be preprogrammed, so any significant change to the engine that alters its VE requires reprogramming the computer. The MAF sensor is typically found in the air intake tube, before the engine’s throttle body. •Kit includes everything you need to control your stock or mild LS transplant engine •Pre-calibrated for no-hassle installation and tuning •Fully adjustable thru included 3.5” full color touchscreen •Available for … I've ran the numbers several times on carb vs. EFI with and LS, and the difference always comes out to just a couple hundred bucks. N Alpha For radical engines or engines never produced with fuel injection, an aftermarket user-programmable computer system is usually preferred. N Alpha systems work well on engines that operate primarily at wide-open throttle—such as race cars—but are much less accurate at part-throttle than more sophisticated systems because of their relatively simple fuel map. On nonstock engine retrofits or EFI conversions on engines never produced with fuel injection, it may be hard to package an MAF meter within the confines of the engine bay and available intake manifolding. I owned a ’90 mustang lx 5.0 5 speed notchback. Modern EFI engines still need these three elements, but they use different hardware to provide them, and a computer to run the whole process. I’ve watched the handful of videos on line on the Stealth. EFI: Mass Flow vs. Many aftermarket companies make performance MAF sensors, like this one from SCT. Whether you have a stock engine, crate or custom-built engine, HP Multi-Port systems can help you maximize performance! Holley is quickly becoming The New Standard In EFI! John, your 90 Mustang is MAF sensor equipped, so its pretty much the same system as your 2011 charger. Though there is other technology out there, in this story we’re just going to focus on mass air flow and speed density because they are the most common. Any significant engine change requires remapping. Required fields are marked *. Bigger MAF meters are not readily available for old GM TPI systems, but Granatelli says it is possible to adapt Ford meters to them via a conversion wiring harness. By clicking Sign Up, you agree to the  Terms of Use. Beam me up, Scotty. The mass-air meter also includes a temperature sensor that provides a correction for intake air temperature so the output signal is not affected by it. Just adding a cai, headers, and corsa gt exhaust i had to get it “tuned” I don’t see where a speed density system is better. (Image/FiTech). Production-based Speed Density computers also utilize an oxygen (O2) sensor mounted in the exhaust tract. Another single-plane intake issue is that with a common plenum, adjacent cylinders in the firing order can rob some of the air/fuel charge. Is it in an airplane? Those systems that do—including Electromotive, Motec, and Pectel units—are more costly, sometimes considerably so. HP Multi-Port EFI systems for small or big block Chevys are ready for the street or strip with the simple swap of an intake! Speed density systems count on air pressure (as opposed to air flow) and engine speed (rpm) to compute fuel delivery. The computer looks at the air/fuel ratio from the O2 sensor and corrects the fuel delivery for any errors. By utilizing a laptop (or the optional 5.7" full color touch screen LCD) along with the HP's self-tuning capabilities, the HP Multi-Port EFI … If you’ve always wondered about EFI systems but were afraid of the perceived complicated wiring and tuning, or if you’ve ever wondered if EFI systems actually outperformed a carbureted engine, then this article is for you. Your email address will not be published. All good information thanks it makes ";s:7:"keyword";s:30:"holley efi speed density vs ve";s:5:"links";s:645:"Solitaire Tripeaks Club Quest Limit, Over The Moon Newfoundlands, Foreshadowing In The Ransom Of Red Chief, Vampire: The Masquerade -- Bloodlines Spiritual Release, Juliet Huddy Jack, ";s:7:"expired";i:-1;}