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Subaru WRX and STI meet at the dyno with interesting results

Road and Track recently put the 2015 Subaru WRX and the 2015 WRX STI through a battery of dyno tests to find out not only how much difference there is between their two engines, but what kind of differences there are. The WRX gets the company's new FA20 2.0-liter boxer four-cylinder engine with features like a twin-scroll turbocharger, direct injection and variable valve timing on its two cams. The WRX STI stands pat with the older EJ-Series motor, meaning a 2.5-liter boxer four-cylinder with port fuel injection and carryover turbo lag. Subaru pegs the $26,295 WRX at 268 horsepower, 258 pound-feet of torque and an "extremely conservative" 0-60 mile per hour time of 5.4 seconds. The $34,495 STI clocks in at 305 hp and 290 lb-ft with a 0-60 mph time of 5.1 seconds. Ok, fight.
R&T's dyno runs sussed power numbers at the wheel of 223 hp and 245 lb-ft for the WRX, 247 hp and 243 lb-ft for the STI, then went on to demonstrate in numbers what everyone knew: that the WRX consistently puts out more of its torque earlier than the STI and achieves full boost almost three seconds quicker. On the other hand, on the track, the STI was also shown to have a conservative official 0-60 mph time, stopping the timer at 4.8 seconds compared to the WRX's 5.2 seconds.
The mag says it has comprehensive results coming from its "complete battery of tests," but for now, you can scrutinize their dyno charts and let the battle continue about which one you'd rather put your money down for.

2015 Subaru WRX STI

In December, I put the 2015 Subaru WRX through its paces along some incredibly challenging roads in northern California, and to say I walked away impressed wouldn't really do my feelings justice. Say what you will about the way it looks, the new 'Rex is an awesome car, full stop. When it comes to all-weather sports sedans that won't break the bank, it's very tough to beat the WRX.
But then there's its big brother - the STI. The winged wonder. The rally superstar. The car that, to many - and to me - represents all that is right in the world of dirt-and-gravel thrills. Sharp as the WRX has always been, the hardcore STI model has always been a little bit sharper. But in recent years, that hasn't always been a good thing. What I've liked most about the WRX is the fact that it's not an always-on attack missile - it can be forgiving, easy to drive, and if I'm honest, reasonably comfortable. Because of that, in the WRX/STI debate, I've preferred the former for daily driving activities. I've always had a thing for That Wing, but in the outgoing car, the STI was never really far and away a more rewarding car to drive, and it offered exactly zero upgrades in terms of comfort or refinement.
The 2015 WRX is easily the finest example of Subaru's hot hatch sedan to date. But what happens when you try to turn the dial past 11? I headed back to NorCal, including a stop at the historic Mazda Raceway Laguna Seca, to find out.

Subaru testing a BRZ with STI badging and a big wing

Pretty much since the introduction of the Subaru BRZ and its identical Toyota- (or Scion-) badged twin, enthusiasts have been pining for a more powerful version, preferably with an STI badge and all the performance tweaks that come with it. So far though, Subaru has only shown a turbocharged concept that's now a couple of years old, as well as a Japan-only BRZ tS by STI, which only had suspension and handling upgrades. But now, spy photos show Subaru is working on another STI-badged BRZ, and it's testing in the US. Our spy photographer caught this prototype near Subaru's office in Ann Arbor, Michigan, and it's wearing Michigan manufacturer plates. And, although Subaru taped over it, we can still clearly make out the STI badges on front and back. Despite the STI badges, we don't see any evidence that this BRZ has any kind of power adder like a turbocharger or supercharger. The front vents appear to be the same size as the current model, and there's no hood scoop to feed a possible top-mounted intercooler. The exhaust also looks roughly the same as the naturally aspirated BRZ. There are some other upgrades, though. Most noticeable is the huge rear wing, which has similar stanchions to the BRZ tS. In addition to the wing, the body is accented with the STI lip spoiler, side skirts, and rear bumper extensions available on the current BRZ. Behind the multi-spoke wheels are Brembo brakes at each corner. Based on these photos, we'd say this STI-badged BRZ is probably a track package/trim that improves the car's already excellent handling. We of course hope that there may be some horsepower upgrades under the hood. But a lack of visual changes for forced induction, and Subaru's history of reluctance regarding more powerful BRZs, has us erring on the slow side. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.