How does a DI injector differ from normal injector?
A computer that tells the injectors when to spray fuel electronically controls both systems, but the main difference is where each one sprays the fuel. With direct injection, the injectors are in the cylinder head and spray fuel directly into the combustion chamber, mixing with the air charge.
Are LS injectors high or low impedance?
All factory LS V8 engines use high-impedance injectors. RC Engineering (RCEng.com) has lots of info on injectors, including calculators for injector sizing and the change in fuel flow based on fuel pressure.
What makes more HP carb or fuel injection?
Warren Johnson: Properly tuned, carburetors make more peak power than EFI in a Pro Stock engine. EFI performs well over 2,000 rpm or more. On average, if optimized, both systems perform about the same as far as how fast you get down the track. However, the EFI system is much easier to tune than a carburetor.
Why direct injection is bad?
The main advantage of Gasoline Direct Injection technology, its precision, is also its main drawback. Many people have complained to the National Highway Traffic Safety Administration that their GDI-powered cars experience high rates of fuel system clogging and engine carbon buildup.
Why is port injection better than direct injection?
Port injection provides a better, more stable air/fuel mixture at lower engine speeds, which results in smoother operation upon startup. At higher rpm, direct injection provides a greater cooling effect, allowing for more power and less chance of knock.
Do I need high impedance injectors?
If the resistance is between 1.5 and 4.0 Ohm you have low impedance injectors. If the resistance is between 8 and 16 Ohm you have high impedance injectors. Do I need low impedance or high impedance injectors? This depends on the driver signal that your ECU delivers to the injector.
How much HP can LS3 injectors handle?
Stock injectors can support 600 NA HP, but DC will be over 80% around the 500-520 mark.
How much HP does fuel injection add?
When looking at pure horsepower, the fuel injection system only delivers about 10 extra horsepower at peak. It is the ability to constantly be tuning the fuel and air intake for each cylinder that benefits the performance.
How big is the LS fuel injector in a truck?
ENGINE PART # INJECTOR SIZE LH9 12613411 36 lb/hr @ 58 psi LS2 Truck 12569113 89017586 34 lb/hr @ 58 psi L76 Truck 12580681 30 lb/hr @ 58 psi LFA 12580681 30 lb/hr @ 58 psi
What’s the difference between Gen IV and LS3 injectors?
Another subtle change that occurred with the Gen IV LS3 style injector is the lower O-ring diameter which increased from 0.540-inch to 0.565-inch. These larger O-rings are sometimes distinguished by color. The AC Delco versions are blue for the 0.540-inch O-rings on the top while the larger 0.565-inch bottom O-rings are red.
What kind of injector does a Gen 3 truck have?
The early Gen III truck engines such as the 4.8L, 5.3L, and 6.0L LS engines spec’d a much shorter injector body that retains the upper and lower O-ring dimensions of the LS1/EV1 but is substantially shorter than the LS1 injector. Making this early truck injector unique is its Multec 2 connector.
Which is the shortest type of GM fuel injector?
(Left) The tall LS1 style injector on the right is slightly shorter than the older Bosch TPI injectors on left, and retains the EV1 electrical connector. (Right) The latest Gen IV style injector – sometimes called the LS3 style – is the shortest of the GM injectors.