Regan Brown
The power output of a vehicle is influenced by several factors, including the fuel lines, fuel pump, and injectors. While there is no definitive answer, estimates suggest that stock fuel lines in certain vehicles, such as the Toyota Supra MKIV, can handle up to 500-550 whp. Some users have reported achieving over 600 whp with stock fuel lines, but this may depend on various factors, including fuel type and additional modifications. Upgrading the fuel lines can be costly, especially considering the price of fittings, but it may be necessary for those seeking higher power outputs.
| Characteristics | Values |
|---|---|
| Stock fuel line size | 5/16" (8mm) hardline |
| Max power | 500-700 whp |
| Fuel pump | Walbro 400lph |
| Injectors | 630cc, 800cc, 900cc |
| Fuel pressure | 100psi |
| Fuel type | E85 |
| Fittings | -6AN, -8AN, -12AN |
| Cost | $30/meter for Teflon braid |
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What You'll Learn
Injector duty cycle at 90% making 450rwhp
Injector duty cycle is a function of how long the injector is open. It is the percentage of time that the injector is being held open. At 100% duty cycle, the injector is open for the entire duration of the cycle.
Regarding your specific query, an injector duty cycle of 90% at 450rwhp is feasible, but it is close to the upper limit of what is recommended. Some sources suggest that 80-85% is a healthy maximum, and that exceeding 90% can cause issues with the injectors' ability to function effectively.
It is worth noting that some modern injectors can tolerate higher duty cycles without adverse effects, but it is generally advised to keep the maximum duty cycle below 90% to avoid potential problems.
In the context of your query, "making 450rwhp" likely refers to a power output of 450 rear-wheel horsepower, which is achievable with stock fuel lines on certain vehicles, such as the Toyota Supra MKIV. However, it is important to consider other factors, such as fuel pressure and volume, when determining the appropriate injector duty cycle for a specific application.
Additionally, it is worth considering the potential benefits of upgrading certain components, such as the fuel pump and lines, as well as the potential impact on the injector duty cycle and overall performance.
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Upgrading fuel lines vs. injectors
Upgrading your fuel lines and injectors can significantly impact your vehicle's performance, but it's important to consider the costs and benefits of each option.
Upgrading fuel lines can be a more straightforward process, as some have suggested that it is a possible DIY job. The cost of the materials is also relatively low, with Teflon braid capable of handling any fuel type costing around $30 per meter. Upgrading the fuel lines can also help prevent issues when tuning if the stock return line is not efficiently removing fuel.
On the other hand, upgrading injectors can be more costly, especially if you opt for larger options. Injectors with higher cc ratings, such as 1000cc, can provide significant power gains but may not be necessary for everyone. It's worth noting that even with the stock injectors, some users have reported making over 500hp, and with simple modifications, this number can be pushed even higher.
The decision to upgrade fuel lines or injectors may also depend on your specific setup and goals. For example, if you're planning to use dual pumps or external fuel pumps, you may need to upgrade your fuel lines to handle the increased flow. Additionally, if you're aiming for higher horsepower numbers, such as 700whp, upgrading both the fuel lines and injectors may be necessary to safely achieve those targets.
Ultimately, both fuel lines and injectors play a crucial role in the fuel delivery system, and upgrading one without considering the other could lead to inefficiencies or bottlenecks. It's important to carefully assess your needs, research the compatibility of different components, and make informed decisions to ensure optimal performance and safety.
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Fuel line size
The stock fuel line size for a vehicle is an important consideration when thinking about engine performance. The size of the fuel line impacts the amount of fuel that can be delivered to the engine, and therefore the power that can be generated.
For the MKIV, the stock hard lines are typically 3/8th of an inch in diameter, which is a -6AN standard. This size can support a fuel flow of around 190 gallons per hour when used with a fuel pump inside the tank. This setup can produce over 500hp, with some users reporting up to 550whp. However, it is important to note that pushing beyond 500hp with stock lines is not recommended, as it may lead to decreased performance or other issues.
When using an external fuel pump, it is crucial to ensure that the fuel line is not too small, as this can starve the pump of fuel. The use of an additional pump and line is often suggested as a way to enhance performance without a significant upgrade to the injectors, which can be costly. The size of the line can impact the efficiency of the fuel delivery system, and it is recommended to consult manufacturer guidelines or seek expert advice to ensure the correct fuel line size is used.
The fuel line size also depends on the type of fuel being used. For example, when using E85, alcohol, or methanol, it is recommended to use a larger fuel line to accommodate the different fuel properties. Ultimately, the fuel line size plays a crucial role in the overall performance of the vehicle, and it is important to consider the specific requirements and limitations when making any modifications.
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Fuel line pressure
Some Supra MKIV owners have reported making over 500 horsepower on the stock fuel lines. However, opinions vary, and some suggest staying below 500 horsepower to avoid potential issues. It is recommended to upgrade the stock return line if using a high-flow fuel pump, such as the Walbro 400lph pump, to ensure adequate fuel delivery and prevent heating issues during tuning.
The size of the stock fuel lines is also a factor to consider. The hard line is typically sized for a -5AN line, which corresponds to a 5/16-inch diameter. However, there are variations, and some owners have reported using 6-AN lines or even larger 8-AN lines for their setups. The choice of fuel line size depends on the specific fuel system components and horsepower goals.
Upgrading the fuel lines can provide benefits in terms of fuel flow capacity and compatibility with different fuel types. Teflon braid fuel lines, for example, can handle any fuel type and are a cost-effective upgrade option. Additionally, upgrading the fuel lines can be a simpler modification compared to replacing the fuel tank or performing extensive fuel system pressure tests.
In summary, fuel line pressure and size are critical factors when modifying a vehicle's fuel system. While the stock fuel lines on the Supra MKIV can support up to 500 horsepower or more, careful consideration of the entire fuel system, including injectors, pumps, and regulators, is necessary to ensure optimal performance and safety. Upgrading the fuel lines can provide benefits in terms of fuel flow capacity and compatibility, making it a worthwhile modification for certain applications.
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Fuel line restrictions
Fuel supply restriction, also known as pressure drop, is a crucial factor to consider when designing a fuel delivery system. It refers to the drop in pressure in the fuel line, which is typically measured as a negative number on the suction side of the supply pump. A clogged filter or an inadequate fuel line size can cause this pressure drop, leading to incorrect functioning of the fuel system.
The fuel pressure pulsation damper in the stock line is a significant restriction in the fuel delivery system. The stock system has a -6 feed line from the tank to the fuel filter, located under the car, and another line from the filter to the rail. The OEM feed line after the filter is restrictive, often requiring replacement. The stock fuel lines are estimated to be around 5/16" hardline, close to 6AN standard, which can handle approximately 190 gallons per hour flow rate when using an internal fuel pump. However, these lines become more restrictive when using external fuel pumps to pull fuel from the tank.
To ensure optimal performance, it is recommended to stay under 500-600 horsepower (whp) with the stock fuel lines. Some users have reported making over 500 whp on stock lines, but pushing beyond this limit may require upgrading to a bigger return line and installing an additional fuel pump and fuel line. For example, a 6 or 8 feed line can be run parallel to the stock line to enhance fuel delivery.
It is worth noting that the diameter and length of the fuel line play a crucial role in maintaining the correct pressure and flow rate. Longer fuel lines result in increased friction and pressure loss. Therefore, larger fuel lines are generally preferred to minimize fuel supply restriction, especially in marine diesel engines, where ample sizing is essential to ensure sufficient fuel flow.
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Frequently asked questions
The HP limit of stock fuel lines and rails is around 500-550. However, some forum users have claimed to have made over 600 rwhp with oem lines and rails.
The stock line is close to 5/16" hardline. The stock lines are not restrictive and can support more than 800 crank horsepower.
There are a few options for upgrading the stock fuel lines on a MkIV. One option is to use aeromotive fittings that connect to the stock plastic fuel line. Another option is to use Earl's Hard Line AN Tube Fitting 5/16" to -6AN, which can be put in line after the stock filter.
