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2010 Subaru Impreza WRX STI Special Edition - Click above for high-res image gallery

Rumblings about a diesel-powered Subaru WRX STI first surfaced more than two years ago, and now they're back. The realities of meeting CO2 emissions limits in Europe and elsewhere may have increased the likelihood of a high-performance diesel Subaru, and an oil-burning STI would probably generate at least 200 horsepower and well over 300 pound-feet of torque, suggests Autocar. According to the UK rumor-traffickers, gasoline engines will almost certainly remain in the mix, albeit with reduced displacement. A new engine based on the 1.5-liter boxer in the base Impreza could offer suitable power if mixed with other technologies like direct injection. Even if Subaru does indeed develop a diesel STI, there's no guarantee that such a model would ever make it to North America.

Of course, the WRX doesn't live in a vacuum. Its longtime rival, the Mitsubishi Lancer Evo may also ditch the spark plugs and also add a hybrid system. Earlier plans for a gas hybrid were reportedly canceled in favor of the diesel. The plan is to retain the Evo's sophisticated all-wheel-drive for acceleration to 60 mph in under five seconds and CO2 emissions below 200 grams per kilometer. Thanks to everyone for the tips!

[Source: Autocar, Autocar]

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    • 1 Second Ago
      • 4 Years Ago
      They would never make a Diesel STI. There have been talks of a Diesel 'WRX'. However it's more likely Subaru would create a new name for a Performance Diesel Impreza.
      • 4 Years Ago
      These stories get more depressing everyday.
      • 4 Years Ago
      So instead of Subaru Tecnica International (STI), would it be called a Subaru Tecnica Diesel?
        • 4 Years Ago
        Somebody got it...
      • 4 Years Ago
      Well that sucks. I'd love yo buy an a5 tdi, simply for commuter duty, but track focused canyon carvers that top out at 3500-4500 rpm? No thanks
        • 4 Years Ago
        @BoxerFanatic no man, thank you, it was your persistence that finally got me to realize it. if we were talking a car like the R32, i wouldn't mind, it's more of a GT than track animal, but a track car? NO. there's a reason the s2000 rev'd to high heaven
        • 4 Years Ago
        Thank you!

        What I have been saying, and getting down-rated for for a long time.

        To all of the other people who may not realize this:



        The character of the car and the character of the engine DO NOT MATCH.

        Peak horsepower levels are not a tell-all statistic. 300hp out of a diesel engine, vs. out of a gas turbo engine, vs. out of a naturally aspirated gas engine, are ALL DIFFERENT THINGS.

        A gas turbo engine suits the character of the WRX STI very well.

        A turbo-diesel would be nice in a FORESTER, or maybe an economy-variant of the Impreza. It is not the same as a performance engine.

        (and the same caveat every time this comes up, this is not an Audi prototype race car, so don't equate it with one. The audi diesel race car probably doesn't drive the same way as a gasoline based equivalent race car, either. Diesel can be powerful. If it is powerful, it can be geared to be fast. That doesn't mean the qualitative aspects are more pleasant to drive, let alone on the street, in a production car.)
      • 4 Years Ago
      So many rumors being passed of as news reports these days.
      • 4 Years Ago
      Man, the future is gonna be weird...
      • 4 Years Ago
      i have no problem with a diesel sti as long as wieght is reduced,still 6 speed manual offered and it makes 300hp and 450lb-ft torque and handles amazing...must be brought to NA also can;t just abandon this market cause its a diesel.....
      • 4 Years Ago
      • 4 Years Ago
      Diesel is not just for trucks.
      • 4 Years Ago
      Please no.
      • 4 Years Ago

      i wanna choke every accountant, every regulator and everyone who buys one!

      never mind the nano-particulates coming out of modern diesels, but WHO will buy the diesel as opposed to the petrol? i mean, people hardly know subaru, let alone the impreza, so the only people interested in the STI are PETROLheads


      or will they just flat out cancel the STI petrol?

      whats next? WRX diesel-only????
      • 4 Years Ago
      Just speculation I guess.
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