Lexus IS250 F Sport Intake Upgrade (2012)

by Alex Braham 42 views

So, you're thinking about giving your 2012 Lexus IS250 F Sport a little boost? Awesome! One of the most popular ways to do that is by upgrading the air intake system. Let's dive into why you might want to, what to consider, and how to make sure you get the best bang for your buck.

Why Upgrade Your Intake?

Let's talk about why you'd even consider swapping out your stock intake. The factory intake on the IS250, like most cars, is designed for quiet operation and decent filtration, not necessarily maximum performance. An aftermarket intake, on the other hand, is designed to:

  • Increase Airflow: This is the big one. Aftermarket intakes typically use less restrictive filters and larger diameter tubing. More air = more power, in theory.
  • Improve Throttle Response: A less restrictive intake can lead to quicker throttle response, making the car feel more eager to accelerate.
  • Enhance Engine Sound: Let's be honest, a lot of us do it for the sound. A good intake can add a nice, throaty growl to your engine, especially under acceleration.
  • Aesthetics: Some aftermarket intakes look really cool under the hood, adding a touch of style to your engine bay. This can be a big plus for car enthusiasts who love showing off their rides.

However, it's super important to manage expectations. Gains from an intake alone on a naturally aspirated engine like the IS250's are generally modest. You might see a few horsepower, but it's more about the overall driving experience.

Understanding the Stock Intake System

Before we get into aftermarket options, let's quickly break down the stock intake system. The factory air intake on the 2012 Lexus IS250 F Sport is designed as a closed system, meaning it draws air from within the engine bay. This air is then filtered through a paper or fiber filter element before entering the engine. While this setup is effective at filtering out debris and keeping the engine clean, it can be somewhat restrictive, especially at higher RPMs. The design prioritizes minimizing noise and ensuring consistent airflow under various driving conditions.

One of the main reasons for the restriction in the stock intake is the use of narrow, convoluted tubing and a relatively small air filter. These components limit the amount of air that can flow into the engine, which in turn limits the engine's ability to generate power. Additionally, the closed design of the stock intake can lead to the intake of warmer air from the engine bay, which is less dense and contains less oxygen than cooler air from outside the engine bay. This can further reduce engine performance.

For enthusiasts looking to maximize their IS250's performance, upgrading the intake system is often one of the first modifications they consider. By replacing the restrictive factory intake with a less restrictive aftermarket option, they hope to improve airflow, increase horsepower, and enhance the overall driving experience. However, it's essential to choose a high-quality aftermarket intake that is designed specifically for the IS250 and to ensure that it is properly installed to avoid any potential issues. With a well-chosen and properly installed intake, drivers can unlock additional performance and enjoyment from their 2012 Lexus IS250 F Sport.

Choosing the Right Intake for Your IS250

Okay, so you're sold on the idea. Now comes the fun (and sometimes overwhelming) part: picking the right intake. Here's what to keep in mind:

  • Types of Intakes:
    • Short Ram Intakes (SRI): These replace the airbox with a filter mounted directly on the throttle body. They're generally cheaper and easier to install, but can suck in hot air from the engine bay, reducing performance. These can be ideal for those looking for a quick and easy upgrade but may not provide the best performance gains in all situations.
    • Cold Air Intakes (CAI): These extend the filter down lower, usually into the fender well, to draw in cooler air from outside the engine bay. They usually offer better performance than SRIs, but can be more expensive and harder to install. Cold air intakes are particularly beneficial in hot climates or during demanding driving conditions, as they help to reduce the risk of heat soak and maintain consistent power output.
    • Intake Tubes: Sometimes, you can just replace the intake tube with a less restrictive one and keep the stock airbox. This is a more subtle upgrade, but can still improve airflow and throttle response. It's an excellent option for those who want to retain the factory airbox's filtration capabilities while still enjoying some performance gains.
  • Filter Type:
    • Oiled Filters: These use a layer of oil to trap dirt and debris. They offer excellent filtration and can be cleaned and reused. Brands like K&N are well-known for their oiled filters. Proper maintenance, including regular cleaning and re-oiling, is essential to ensure optimal performance and prevent damage to the engine.
    • Dry Filters: These use a synthetic material to filter the air. They're easier to maintain (just clean them), but may not filter as well as oiled filters. Dry filters are a great choice for those who want a low-maintenance option without sacrificing performance. Regular cleaning is still necessary to keep the filter functioning effectively.
  • Material: Intakes are typically made from aluminum or plastic.
    • Aluminum: Looks great, dissipates heat well, but can get hot to the touch.
    • Plastic: Lighter, doesn't conduct heat as much, but may not look as fancy. In general, plastic intakes are more affordable than aluminum ones.
  • Brand Reputation: Stick with reputable brands like AEM, Injen, K&N, or Weapon-R. Read reviews and see what other IS250 owners are saying.
  • Price: Intakes can range from around $150 to $400 or more. Set a budget and stick to it. While it can be tempting to go for the most expensive option, it's not always necessary to achieve satisfactory results.

Key Considerations for 2012 Lexus IS250 F Sport

When selecting an intake for your specific 2012 Lexus IS250 F Sport, there are several key considerations to keep in mind:

  • Compatibility: Ensure that the intake you choose is specifically designed for the 2012 Lexus IS250. This will guarantee a proper fit and optimal performance. Verify that the intake is compatible with your car's model year and engine configuration before making a purchase.
  • CARB Compliance: If you live in California or another state with strict emissions regulations, check to see if the intake is CARB (California Air Resources Board) compliant. CARB-compliant intakes have been tested and approved for use in California and meet the state's stringent emissions standards. Using a non-CARB-compliant intake in California can result in a failed smog check and potential fines.
  • Installation: Consider the difficulty of installation. Some intakes are relatively easy to install and can be done at home with basic tools, while others may require professional installation. If you're not comfortable working on your car, it's best to have a professional install the intake to ensure that it's done correctly.
  • Maintenance: Different intakes have different maintenance requirements. Oiled filters require regular cleaning and re-oiling, while dry filters only need to be cleaned periodically. Choose an intake that fits your lifestyle and maintenance preferences to ensure that it remains in good condition and continues to perform optimally.

Installation: DIY or Pro?

So, you've got your shiny new intake. Now what? You have two options: install it yourself, or take it to a professional.

DIY:

  • Pros: Saves money, gives you a sense of accomplishment.
  • Cons: Can be time-consuming, requires some mechanical knowledge, potential to mess things up.

Professional Installation:

  • Pros: Guaranteed to be done correctly, saves you time and hassle.
  • Cons: Costs money.

If you're comfortable working on cars, installing an intake is usually a pretty straightforward process. Most intakes come with detailed instructions. Just make sure you have the right tools and take your time. However, if you're not mechanically inclined, it's best to leave it to the pros. A botched installation can lead to all sorts of problems.

Step-by-Step Installation Guide (General)

While the exact steps may vary depending on the specific intake you choose, here's a general overview of the installation process:

  1. Gather Your Tools: Before you begin, make sure you have all the necessary tools, including a socket set, screwdrivers, pliers, and possibly a few specialty tools depending on the intake design. Having the right tools on hand will make the installation process much smoother and more efficient.
  2. Disconnect the Battery: Safety first! Disconnect the negative terminal of your car's battery to prevent any electrical accidents during the installation process. This will also reset the ECU, which can help the car adapt more quickly to the new intake.
  3. Remove the Stock Airbox: Carefully remove the factory airbox and intake tube. This usually involves loosening a few clamps and disconnecting any sensors or hoses that are attached to the airbox. Take your time and be gentle to avoid damaging any of the components.
  4. Install the New Intake: Follow the instructions that came with your new intake to install it in place of the stock airbox. Make sure all connections are tight and secure. Pay close attention to the placement of the filter and any heat shields that are included with the intake.
  5. Reconnect Sensors and Hoses: Reconnect any sensors or hoses that you disconnected during the removal process. Double-check all connections to ensure that they are properly seated and secured.
  6. Reconnect the Battery: Once you've completed the installation, reconnect the negative terminal of the battery. Start the car and let it idle for a few minutes to allow the ECU to adjust to the new intake. Listen for any unusual noises or vibrations.
  7. Test Drive: Take the car for a test drive to see how it performs with the new intake. Pay attention to throttle response, acceleration, and overall engine performance. If you notice any issues, double-check the installation and consult with a professional mechanic if necessary.

Potential Issues and Things to Watch Out For

While an intake upgrade is generally safe and reliable, there are a few potential issues to be aware of:

  • Check Engine Light (CEL): Sometimes, an aftermarket intake can trigger a CEL. This is usually due to changes in airflow that the ECU isn't expecting. Make sure the intake is properly installed, and consider getting a tune to optimize the ECU for the new intake.
  • Mass Air Flow (MAF) Sensor Issues: The MAF sensor measures the amount of air entering the engine. If the intake is poorly designed or installed, it can disrupt the airflow and cause the MAF sensor to malfunction. This can lead to poor performance and a CEL.
  • Water Ingestion (CAI): If you have a cold air intake that's mounted low in the fender well, there's a risk of water ingestion if you drive through deep puddles or flooded areas. This can cause serious engine damage. Consider installing a bypass valve or avoiding deep water altogether.
  • Over-Oiling (Oiled Filters): If you have an oiled filter, be careful not to over-oil it after cleaning. Excess oil can get sucked into the engine and damage the MAF sensor. Use the proper amount of oil and let the filter dry completely before reinstalling it.

Tips for Avoiding Potential Issues

To minimize the risk of encountering any of these issues, here are a few tips to keep in mind:

  • Choose a Quality Intake: Invest in a high-quality intake from a reputable brand. Avoid cheap, no-name intakes that may not be properly designed or tested.
  • Follow Installation Instructions Carefully: Read and follow the installation instructions that come with the intake. Pay attention to all the details and make sure all connections are tight and secure.
  • Check for Leaks: After installing the intake, check for any air leaks around the connections. Leaks can disrupt airflow and cause performance issues. Use a smoke machine or soapy water to check for leaks.
  • Monitor Engine Performance: Keep an eye on your car's engine performance after installing the intake. Pay attention to throttle response, acceleration, and overall engine smoothness. If you notice any changes, investigate the cause and take corrective action.

The Verdict: Is an Intake Worth It?

So, is upgrading the intake on your 2012 Lexus IS250 F Sport worth it? The answer, as always, depends on your goals and budget. If you're looking for a significant horsepower boost, an intake alone probably won't deliver the kind of gains you're hoping for. However, if you're looking for improved throttle response, a more aggressive engine sound, and a touch of under-hood style, then an intake can be a worthwhile upgrade. Just be sure to do your research, choose a quality intake, and install it properly.

Ultimately, the decision is yours. Consider what you want to achieve with your IS250 and whether an intake upgrade aligns with your goals. If you're still unsure, talk to other IS250 owners or consult with a professional mechanic. They can provide valuable insights and help you make an informed decision.