Rajan Wilcox
When it comes to upgrading fuel injectors on an LS1 GTO, there are a few things to consider. The stock LS1 injectors are 28#, but some Ford injectors can be used as plug-and-play upgrades, such as the popular green top 42# injectors. It's important to note that the LS1 and LS2 injectors have different wiring connectors, with the LS2 often requiring adapters. When installing new fuel injectors, it's crucial to use silicon grease on the o-rings and ensure proper clipping and seating. Additionally, the injector duty cycle should be monitored, with 80%-90% being the recommended maximum. Upgrading to larger injectors may be necessary for certain performance modifications, such as power adders like blowers, nitrous, or turbos.
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What You'll Learn
LS1 fuel injectors use 28# injectors
The LS1 fuel injectors are designed for the 5.7L engine and are considered the standard fuel injector for this family of engines. They have a flow rate of approximately 255 liters per hour, which is perfect for most street applications. The LS1 engine was made from 1997 to 2004.
The LS1 fuel injectors use 28# injectors. They have a longer length compared to other fuel injector types, as the LS1 engines are larger, and the fuel injectors need to be longer to reach all the engine's cylinders. The LS1 fuel injectors also have a narrower spray pattern than the LS2 or LS3 fuel injectors due to the smaller cylinders in the LS1 engine.
The LS1 fuel injectors operate at a lower fuel pressure than the LS2 or LS3 fuel injectors as the LS1 engine produces less power. The fuel pressure for the LS1 injectors is around 45-58 PSI. The higher fuel pump pressure means that the 28# injectors flow more like 36# on the GTO.
The LS1 fuel injectors use a single-hole O-ring style connector, while the LS2 and LS3 fuel injectors use a multi-hole clip-style connector. This means that the Ford injectors are plug-and-play for the LS1 but require adapters for the LS2. The 42# Ford green tops are a common upgrade for the GTO.
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LS2 intake manifolds are poor quality
The LS2 intake manifold is considered to be of poor quality, with some describing it as "one of the worst GM ever made". This is due to a design flaw in the initial manufacturing process, where bad welds allowed a small amount of air to leak internally, hampering airflow. This issue has led to a common practice of swapping out the stock manifold for an aftermarket alternative, such as the FAST intake, which provides significant power and torque gains.
The LS2 intake manifold is also not interchangeable with other 6-litre LS engines, as it features cathedral-shaped inlet ports, while others have rectangular inlet ports. This exclusivity to HSV models has resulted in a limited release of LS2 engines in Australia, making the LS2 intake manifold difficult to find.
The stock LS2 injectors are 32 lbs, and most NA guys upgrade to 42 lbs injectors, while most FI guys opt for 60 lbs injectors. It is important to get the injectors flow-matched, and to consider the injector duty cycle when deciding on a size.
When it comes to tightening fuel injector inlet screws for an LS1 GTO, it is recommended to use a torque wrench to tighten the screws to 6 ft-lbs. This ensures a secure connection without damaging the components.
Upgrading the intake manifold on an LS2 engine can provide significant power and torque gains, with ported factory LS2 intakes and quality aftermarket intakes yielding around 20-25whp and 25-30wtq. Upgraded intake manifolds improve the power and torque curves, resulting in noticeable gains in mid-range power and torque, which is beneficial for track or strip performance.
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LS2 stock injectors are 32lb
The stock LS2 injectors are 32 lb/hr. They are known to be one of the worst GM ever made, even when ported. However, they are still used in some vehicles, such as the LS2 GTO.
The LS2 injectors are smaller than the LS1 injectors, which are 28#. The LS1 and LS2 injectors have different wiring connectors, and the LS2 uses a smaller injector that is about 3/8" shorter. The LS2 injectors can be used with the stock throttle body and fuel rail without any modifications or additional equipment.
When upgrading fuel injectors, it is important to consider the injector duty cycle. It is recommended to do all the desired engine mods and then review the duty cycle before replacing the injectors. Upgrading to larger injectors may require the use of fuel rail spacers or injector adapters to accommodate different injector sizes.
For the LS2, common upgrades include the LS3 injectors and the FAST 102mm intake. The LS3 injectors are 42#, and the FAST 102mm intake provides improved power and capacity for future mods.
It is also important to ensure that the injectors are flow-matched for optimal performance.
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LS3 injectors can be used on LS1
LS1 fuel injectors also have a longer length compared to LS3 injectors because the LS1 engines are larger, and the longer injectors are necessary to reach all the engine's cylinders. The spray pattern of LS1 injectors is also narrower than that of LS3 injectors due to the smaller cylinders in the LS1 engine. Additionally, LS1 injectors operate at a lower fuel pressure than LS3 injectors since the LS1 engine produces less power.
When using LS3 injectors on an LS1 engine, you will need to make some modifications. You will require EV1 to EV6 harness adapters, as well as spacers to accommodate the difference in injector height. It is recommended to use Fast spacers FST-146025-KIT and special o-rings for the bottom of the injector to fit snugly in the LS1 intake. These spacers are commonly available, and the necessary adaptations are generally straightforward.
It is worth noting that LS1 fuel injectors have a single-hole O-ring style connector, while LS3 injectors use a multi-hole clip-style connector. This provides a more secure connection to the fuel rail. When upgrading fuel injectors, it is important to consider the flow rate, connector type, and engine type/size to ensure optimal performance and compatibility.
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42# Ford green tops are a common upgrade
Upgrading your fuel injectors? 42# Ford green tops are a common upgrade for the LS1 GTO. They're also very popular on other cars, too.
If you're looking to upgrade your LS1 GTO, the 42# Ford green tops are a great option. They're a popular choice for a reason—these injectors are easy to tune and will plug right into your LS1 harness. Plus, they flow more like 36# on the GTO due to the higher fuel pump pressure of the LS1.
You can also use these injectors on an LS2 with adapters. And, if you're looking to put a LS2 injector in an LS1, LS6, or aftermarket intake, you'll be happy to know that the FIC Rebuilt Ford 42 LB Green Top set comes with everything you need, including billet top hats and Viton O-rings.
When it comes to injector sizes, there are a lot of options available. For example, you can purchase injector sizes ranging from 19# to 96# for the Ford Mustang. And, while the stock LS2 injectors are 32lb, most NA guys opt for 42lb injectors, while most FI guys go for 60lb injectors. However, it's important to keep in mind that, as one LS1GTO forum user notes, it's "all about the duty cycle." It's recommended to do all your desired mods first and then have a tuner review the injector duty cycle before replacing the injectors, as they may not need to be replaced at all.
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Frequently asked questions
The LS1 uses 28# injectors. The green top 42# Ford injectors are a common upgrade for the GTO.
The stock LS2 injectors are 32lb's, most NA guys jump to 42lb injectors and most FI guys go to 60lb injectors.
First, put some silicon grease on the new injector o-rings. Then, push the injectors towards the rail gently. Be sure to get the grooves and clips properly clipped in place. Reinstall the rail, and snake it back through again, watching that the injectors don't get stuck. Once all the injectors are partly seated in the intake, depress them in the rest of the way. Plug all the connectors back up and clip everything in place. Now put the screws back in to hold down the fuel rail, these are the 4 10mm bolts. You want these snug, not tight.
You will need an internal clip to secure the connector to the rail. Make sure you have the 3/8" and not the 5/16" end.
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