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It's a problem with direct-injected engines, since there's no fuel flowing over the valves, helping to clean them. It's important to note that all GrimmSpeed Staged Power Packages require a proper tune.The GrimmSpeed Stage 3 Power Package features the same components of the Stage 1 Package, but further increases the performance of the Turbocharger with the inclusion of the J-Pipe. We have car mod guides for the Subaru WRX and WRX STI, Subaru BRZ and Toyota 86, with more to come. It's the last engine management solution you'll ever need. Stage 1?
All the components of this package work together to decrease restriction both before and after the turbocharger, as well as to provide the ultimate choice in boost control. This package includes everything from the Stage 2 package with the addition of the famous GrimmSpeed Top Mount Intercooler. The beauty of the GrimmSpeed Staged Power Packages is that all of the included components were designed and tested to work well together as a complete system. The AccessPort costs around $650 new, but In terms of powered added, Stage 1+ isn't a big jump from Stage 1. Stage 1 just means you've flashed a tune. The AccessPort is a tuning device that Cobb makes for many turbocharged cars, including the WRX. This frees up restriction in the intake, allowing for more airflow and more power. Perrin Shift Stop Review. With the same power adders the STi pulls harder, longer, and smoother than my stage 2 WRX. 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. GrimSpeed’s Stage 3 kit includes an intake and j-pipe, which alone would either be Stage 2 or 2+ depending on who you ask, as well as an intercooler, charge pipe … 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. Over stock, the J-Pipe replaces a restrictive catalytic converter with a high flow unit as well as increases the tubing diameter. It works by controlling the turbo's wastegate, allowing exhaust gasses to bypass the turbo, preventing it from spooling and creating more boost.While the WRX includes an electronic boost controller from the factory, aftermarket ones allow for a higher degree of control. This is the definitive choice for more boost, faster spool, safety and consistency, and power production. The EGR system pipes some exhaust gas back into the intake.

Replacing the downpipe and going Stage 2 also will require additional tuning. The GrimmSpeed J-Pipe replaces the extremely restrictive factory J-Pipe and catalytic converter with high quality 3” diameter stainless tubing and a high-flow catalytic converter. It works by diluting the oxygen in the combustion chamber and allowing these exhaust gases to absorb some heat. (AccessPort)

The TGVs have butterfly valves inside and controlled by the ECU. To tell the truth I was skeptical about this package and slowly got piece by piece, with the intercooler being the last piece. Stage 3 lights for the 2015+ WRX/STI will turn some heads and stand out at the shows. At least one company, GrimSpeed, is selling a Stage 3 kit for the 2015+ Subaru WRX.
Stage 4 typically includes all items in Stage 3, plus a larger/more efficient turbocharger, forged internal engine components, and potentially other high cost items. The free-flowing design of the J-Pipe offers superior boost control, and is the perfect complement to the Electronic Boost Control Solenoid. GrimSpeed's Stage 3 kit includes an intake and j-pipe, which alone would either be Stage 2 or 2+ depending on who you ask, as well as an intercooler, charge pipe and electronic boost controller (EBCS).Other common mods people install at this level include TGV and EGR deletes, just like stage 2. You'll hear the turbo spool up and hear blow-off sounds.Many intakes for the Subaru WRX will have off-the-shelf tunes available, such as the Cobb Big SF intake and Mishimoto Performance Intake. Once you start researching, all of this lingo and these acronyms can be very confusing. Fill in your email below to request a new password. We hope this guide helped to clear things up and help you understand the different WRX stages. The Stage 3 Power Package for STI Includes: COBB Accessport, SF Intake System, SF Airbox, SS 3" Downpipe, Cat-Back Exhaust, SS Turbo Heatshield, AEM High Flow Fuel Pump, Top Feed 1050x Fuel Injectors, Fuel Rails, Fuel Rail Line Kit, Fuel Pressure Regulator for Fuel Rail Kit, Subaru Throttle Body Coupler, Silicone Turbo Inlet and the COBB Vehicle Badge. A boost controller prevents the car from building too much boost, keeping it at a specific target set in the ECU. Cobb is way over priced. I am going from stage 2 (which i was really happy with) to stage 3. Plus the bigger brakes makes it oh so much sweeter than the WRX… Post your times. We have guides and reviews for the top modifications you can purchase to make your car better and faster. The GrimmSpeed Stage 3 Power Package is a well-rounded kit, offering increased power and torque output thanks to reduced restriction before and after the turbo, as well as a more aggressive street presence thanks to the intake and exhaust tones. We’ve noticed that it’s challenging to find all the information you need when modifying your car, so we’ve decided to try and collect, and combined with experience, make it easy car enthusiasts to modify and tune their own cars.ThinkTuning participates in the Amazon Services LLC Associates Program, eBay Partner Network, and various other affiliate programs.