Support for Subaru’s newest version of the STI is now available! The 2018 WRX STI Type RA is the limited edition car Subaru enthusiasts have been waiting for. Upgrades over the standard WRX STI make it a true weapon on the road course, inspired by the 2017 Nürburgring record-setting car. Well, the fastest ever just got faster. Our Subaru team is extremely pleased to announce Accessport and Accesstuner tuning support as well as assorted bolt-on parts compatibility for the 2018 WRX STI Type RA!
|The Accessport is the world’s best selling, most flexible, and easiest to use ECU upgrade solution for your Subaru. Unlock power hidden within the vehicle by replacing conservative factory settings with more aggressive calibrations. Follow our staged upgrade path with pre-loaded Off The Shelf (OTS) maps or use custom mapping for any modification level. It’s the last engine management solution you’ll ever need.
Get yours HERE!
Off The Shelf Maps and Power Gains
The Type RA is loaded with a much more aggressive tune than we are used to seeing from Subaru. In fact, on ACN91 octane fuel the car was seeing enough knock to shut off the boost control system completely. Using higher quality fuel (93 Octane) we did see much more consistent power out of the Type RA however it is still leaning fairly hard on the knock detection system – with hits of 4 degrees seen relatively consistently. With that said, our internal calibration team was still able to find a bit of power, specifically in the mid-range, which can be realized in our Stage 1 Off The Shelf Maps. By using a different tuning strategy, we were also able to mitigate the concerning levels of knock. This makes for noticeable gains and peace of mind, especially for those using ACN91 fuel. Our Calibration team will be investigating additional Off The Shelf Maps (Stage 2, etc.) in the future. Stage 3 Packages will not be available until we have a solution for the airbox snorkel, more on that below.
STI Type RA Typical Stage1 vs. Stock Power:
Stage 1 93 Oct. Max gains: +16% HP / +17% TQ
Stage 1 93 Oct. Peak gains: +2% HP / +14% TQ
For additional information relating to Off The Shelf Maps, see the Map Notes Page.
Almost all of the parts from the standard 2018 WRX STI carry over to the Type RA with the main exception being the SF Intake System. While the intake and airbox will physically fit, the STI Type RA comes with an updated intake snorkel that is not compatible with our SF Intake Airbox. Due to heat concerns, we do not recommend installing an intake system in these cars without using an airbox to direct fresh air onto the filter element. Our hard parts team will be evaluating a Type RA-specific Intake Airbox to go along with our SF Intake in the near future. The COBB SS 3″ Turboback Exhaust does bolt right up to the STI Type RA as expected, however, a Stage 2 Off The Shelf Map is not yet available. Custom tuning will be required for any bolt-on parts at this time.
For a complete list of compatible parts, see the 2018 WRX STI Type RA Vehicle Page.