Full Answer
What are the different types of ‘Spider’ fuel injectors?
There are two types of the ‘Spider’ fuel injector assemblies used on the GM 4.3L, 5.0L, 5.7L engines and this article will help you with both types. In case you're wondering, one type belongs to the Central Port Injection ( CPI) system and the other to the Central Sequential Fuel Injection ( CSFI) system. How can you tell them apart?
What are the different types of fuel injectors used in GM engines?
There are two types of the ‘Spider’ fuel injector assemblies used on the GM 4.3L, 5.0L, 5.7L engines and this article will help you with both types. In case you're wondering, one type belongs to the Central Port Injection ( CPI) system and the other to the Central Sequential Fuel Injection ( CSFI) system.
How to tell if a Vortec injector is a spider?
Notice how the nozzle of the injector is recessed away from the intake valve. The plastic pintle tube acts as an insulator to the injector tip which decreases the amount of carbon that's able to develop on the end of the injector. GM has engineered a new Spider unit and it was used on 2002-2007 Vortec motors.
How much horsepower does an EFI System add?
The answer is: no EFI system is capable of making horsepower, it can only support the power potential of the engine, and the fuel injectors are the limiting factor. A naturally-aspirated gasoline engine will require anywhere from.4 to.45 pounds of fuel-per-hour, per horsepower.
How much HP can stock 5.3 injectors handle?
At the low end of the 5.3 spectrum, the LM7's 25 lb fuel injectors are going to max out before they reach the 400 horsepower stage, typically around the 380 horse mark. Gen IV injectors, particularly those on flex fuel models, are at or just above the 30 lb mark, which will bring you closer to 400 horses.
How much HP can injectors handle?
Flow Rate Definition, Calculating Horsepower RangeInjector Flow RateNaturally Aspirated EngineEngine w/ Power Adder19 lbs./hr.225-290 hp185-240 hp24 lbs./hr.280-360 hp240-300 hp30 lbs./hr.350-450 hp300-375 hp36 lbs./hr.425-540 hp350-450 hp4 more rows•May 27, 2017
Do bigger fuel injectors increase HP?
Larger throttle body and injectors A larger high-performance throttle body will deliver more horsepower. Depending on what type of engine you have, you can gain as much as 10-20 more horsepower and comparable torque.
How much power can stock ls3 injectors handle?
Stock injectors can support 600 NA HP, but DC will be over 80% around the 500-520 mark. We have a cam/head C6Z that is on stock injectors currently at 590 rwhp on pump gas. E85 and Some oxygenated fuels will drastically lower the power level you can achieve for an injector.
How much HP will 120lb injectors support?
1900 horsepowerRated injector flow: 120 lb/hr @ 43 PSI. Supports up to 1900 horsepower.
Can you have too big of injectors?
Bigger is not always better It's easy to fall into the trap of thinking that bigger fuel injectors equal more power, but unless your engine is set up to deal with the extra fuel, you'll be on a fast track to trouble. The excess fuel will flood the engine and it either won't run at all, or will be running too rich.
What happens if you put bigger injectors on a stock motor?
If you throw in bigger injectors it will hold that injector open for the same amount of time as the smaller injectors and it will dump TONS of fuel in.
How much horsepower does fuel injection add?
about 10 extra horsepowerWhen 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 much HP will fuel injectors add?
The technical answer is yes; fuel injectors can add 10 extra horsepower at peak. However, for some car owners, that minimal difference does not offset the increased cost and complexity of switching to fuel injectors or upgrading the existing stock fuel injectors.
How much HP can a stock LS3 block handle?
850 to 1000 horsepowerThe block can handle 850 to 1000 horsepower. However, you will want to upgrade to head studs and main studs if you plan on using boost or nitrous.
Can a stock LS3 handle boost?
Each of the engine builders that we spoke with were concise and to the point that the stock LS3 rotating assembly is more than capable of handling the boost levels to attain 500 horsepower.
How much HP does a cam add to a LS3?
The 224 cam demonstrated just how much the LS3 motor was in need of wilder cam timing. Stepping up 20 degrees of duration (@. 050) resulted in a gain of just over 50 hp, upping the peak power output from 496 hp and 491 lb-ft to 547 hp and 514 lb-ft of torque.
What is the name of the Bosch fuel injection system?
The earliest reference is the Jetronic –the Bosch name for its early fuel injection system. This connector evolved into the Minitimer that now morphed to EV1. Right away, this becomes mystifying with three different ways to describe this electrical connector.
What injectors are used in 2005 LS3?
Perhaps a bit earlier, around 2005, GM switched the passenger car injector style to the Gen IV, short LS3 style that uses the EV6 or USCAR connector. This is the shortest injector of all the factory squirters, but its size should not be confused with a lack of flow potential as these injectors can crank out the fuel.
Why don't fuel rails work on different engines?
It should also be noted that Aeromotive warned us that they don’t recommend adapting fuel rails to different engines because of the potential for a high pressure fuel leak between the fuel injector and the rail. This warning would likely also extend to use of adapters.
Why are Bosch injectors less popular?
These units are becoming less popular now mainly because they don’t deliver the high flow rates now demanded by today’s more powerful engines. These Bosch injectors used a connector that is referred to by no less than three different aliases.
Does GM carry injectors on trucks?
Unfortunately, GM didn’t carry this injector over to the trucks, choosing instead to go with an entirely different injector.
Do truck injectors need an adapter?
Since most aftermarket EFI systems target the more modern EV6 injectors, using the early truck injectors will often require an electrical adapter. (Left) This is the original Bosch Jetronic injector with its EV1 connector that is also called the Minitimer.
TEST 2: Visual Inspection
The following test is a test I have done every time I have gotten a failed leak down test, and it involves visually checking for fuel leaks after removing the intake manifold's plenum.
Where To Buy A Fuel Pressure Gauge
You can buy a fuel pressure gauge just about anywhere. Your local auto parts store will sell you one, although at a much higher price than the one listed here on the left.
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SS Crew
Will bigger fuel injectors do anything on a realively stock 6.0 engine with only a tune and exhaust mods?
Why is EFI better than carburetor?
It is during these throttle-transition situations where EFI has a distinct advantage over a carburetor, because it is capable of retaining a more consistent air/fuel ratio.
Why is Edelbrock not offering returnless fuel?
Eric Blakely of Edelbrock says, “Edelbrock does not offer a returnless fuel system because our core EFI customer-conversions to EFI are for pre-1974 vehicles with old school, non-baffled fuel tanks.
Why do carburetors need tuning?
To keep in optimal running condition, carburetors usually need frequent tuning to account for different atmospheric conditions. Alex Healey of Holley Performance Products said, “The biggest concern we hear, is the lack of familiarity. Most enthusiasts have been using carburetors all of their life.
What is a carburetor?
You have to remember this about carburetors — they are a simple fuel-metering device that can be easily tuned to operate efficiently while at a steady-state of operation — like when cruising down the highway with no traffic requiring you to depress and lift-off the throttle pedal repeatedly , or when the engine is idling.
What is a non return fuel system?
Just to keep it simple, a non-return style system means the fuel is delivered from the tank to the fuel pressure regulator, and the regulator only allows a required amount of fuel to the engine. The regulator holds the pressure.
Can EFI fix camshaft?
If your car is running terrible and you have tried five carburetors that work perfectly on your friend’s cars, you should probably find out why it doesn’t work on yours before you order an EFI system. EFI can’t fix a camshaft with a bad lobe, or an intake gasket leak.”.
Can EFI be used to fix an engine?
For some reason, there are still people that think that EFI can cure an improperly-running engine. This is true if your engine’s malady is a carburetor that needs rebuilt or replaced, but EFI is not a cure-all for an engine that has problems.