Oh, and we think the Cobb exhaust sounds pretty sweet on the dyno. Buttery rich with that Subie burble but still very mature and not at all fart-can-ish. The final results of the Stage 2 parts and tune is simply amazing. Making wtq at rpm is insane for a 4-cylinder car. I have yet to come close to the limits on this car before it proceeds to frighten me in a good way. The dyno results speak for the benefits of a pro tune — the largest single gains were made with a pro tune on a car that I already thought was too fast for my own good.
Our friends over at Touge Tuning wrote this excellent post about ringland failure and Subaru boxer engines. Some excellent advice and info that should put your mind at ease. I did it bro and i loved it : daang soo much better than stock.. Notify of. Vote Up 0 Vote Down. Dave Pratte. Vote Up -4 Vote Down. MN Web Design. Sorry, your blog cannot share posts by email.
This is the best starting point for anyone looking to mod a WRX. If you have a newer model, your only option to do this is using a Cobb AccessPort. The AccessPort comes preloaded with tunes for the various stages. It simply plugs into the OBD-II port under your dash, and with the press of a few buttons, your car will be Stage 1 in a few minutes. The AccessPort also allows you to monitor some important parameters from the ECU, like knock correction , fuel trims, air-fuel ratio, intake air temperature, oil temperature, and more.
Stage 1 adds significant horsepower over stock, around 30 whp. It also smooths out the throttle, making it much more linear, fixing the oversensitivity of the stock tune. It also smooths out the powerband, eliminating the mid RPM dip around 4. Instead, the car just keeps pulling all the way to redline. Another big change with a stage 1 tune is that it fixes rev hand. Stage 1 tunes will also fix this, making the car overall much smoother and easier to drive.
If you want to start modding your car, buying a Cobb AccessPort is a great place to start, and you'll need it to tune your car for any further physical modifications such as the intake and downpipe. Just make sure that it's unmarried, or fully uninstalled from the previous car, you can't use it. The difference is that an intake is added. Some additional tuning is required to keep the car running correctly when installing any intake.
The car senses how much air is coming in with a MAF mass airflow sensor so it can determine how much fuel to inject. With a different intake, the value it reads will change, so this needs to be corrected by flashing the ECU. When the intake is modified, this will change the readings from the MAF, so some adjustments need to be made. You'll hear the turbo spool up and hear blow-off sounds.
You can simply flash these tunes with your AccessPort, without having a custom tune made for your car. Stage 2 takes things a step further in terms of power added, with some WRX owners gaining 70 whp or more from the stock car's power.
For a Stage 2 tune, you'll need to install a j-pipe, otherwise known as a downpipe. The J-pipe is the section of exhaust that comes directly out of the turbo, has the catalytic converters, and connects to the rest of the exhaust.
The j-pipe is the most restrictive section of the exhaust, so replacing it allows for substantially more airflow and power gains. Replacing the downpipe and going Stage 2 also will require additional tuning. Fortunately, the AccessPort also includes off-the-shelf Stage 2 tunes.
Many people also install a catback exhaust system and intake at this stage, but this isn't necessary. While there's some extra power to be gained here with the work of a good tuner, it's mostly the j-pipe that will bring you extra power. This is where things start to get more ambiguous. After stage 2, it's common to install a flex fuel kit for even further gains. Normally people would simply call that "stage 2 with flex fuel" for example, rather than it being a stage of its own.
The point at which it becomes Stage 3 isn't fully agreed upon, but up next, we'll explain what people usually mean when they say Stage 3. Stage 3 isn't a widely used term, but these extra parts can have some big power increases. Some people report similar gains from these mods as adding an aftermarket j-pipe alone. While it's difficult to define all of the WRX stages past stage 2, there are still some general guidelines.
Generally, the different staged kits for the WRX from different companies are about the same in terms of power added and parts included, but it's common to piece together your own kit, often including parts from many different companies. We hope this guide helped to clear things up and help you understand the different WRX stages.
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