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    • The 2021 G80 BMW M3 will be well over 600 horsepower stock - Heavily underrated F98 X4M Competition S58 dyno shows 520 all wheel horsepower

      If you are not aware BMW is heavily sandbagging output with turbo M motors then you simply have not been paying attention for the past decade. Here is yet another example in the new 2020 BMW F98 X4M Competition and its S58 motor which is rated at 503 horsepower.


      Well, here it is making 520 horsepower to all four wheels in Arizona 119 degree heat on 91 octane pump gas:


      BMW's horsepower ratings are just a joke at this point. They say 503 at the crank and it has more than that at all four wheels. This is easily a 600+ horsepower car.

      Even if you go with conservative 15% drivetrain losses which are traditionally reserved on a Dynojet for a RWD manual vehicle that would mean output is 611 crank horsepower. If you go with 20% losses, we are talking 650 horsepower.

      The G80 M3 gets this same S58 motor and basic drivetrain in a lighter package. 600+ horsepower only makes sense. Why? BMW since the E46 M3 increases horsepower by approximately 75 whp each generation. They simply started sandbagging with the F80 M3 massively.

      E46 M3 - 275 whp
      E92 M3 - 350 whp
      F80 M3 - 425 whp
      G80 M3 - ~500 awhp

      The E92 M3 to F80 M3 horsepower rating went from 414 to 425 at the crank. Yet, wheel output increased by 75+ horses. Explain that.

      With the G80 prepare for a dragster that will be well into the 10's tune only.

      This article was originally published in forum thread: The 2021 G80 BMW M3 will be well over 600 horsepower stock - Heavily underrated F98 X4M Competition S58 dyno shows 520 all wheel horsepower started by Sticky View original post
      Comments 65 Comments
      1. Eleventeen's Avatar
        Eleventeen -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        Who cares? Audi/VW group and GM are doing it with spectacular results in the aftermarket. Most DI only systems are tapped out before a stock frame turbo is maxed out which is pretty limiting if you want to modify the car.
        BMW cares. The N55 and S55 fuel systems already provide enough fuel to max out the stock turbos, so BMW is not going to spend the money to implement DI and PI when they can easily reach the stock power targets without it.
      1. Bowser330's Avatar
        Bowser330 -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        Who cares? Audi/VW group and GM are doing it with spectacular results in the aftermarket. Most DI only systems are tapped out before a stock frame turbo is maxed out which is pretty limiting if you want to modify the car.
        They aren't doing it for the "spectacular results in the aftermarket"; they are doing it to increase reliability by reducing carbon build up on the valves.
      1. Stevenh's Avatar
        Stevenh -
        Click here to enlarge Originally Posted by Bowser330 Click here to enlarge
        They aren't doing it for the "spectacular results in the aftermarket"; they are doing it to increase reliability by reducing carbon build up on the valves.
        Whatever the actual reason might be, I'm sure we all like the results Click here to enlarge.

        Good to know though. That makes a lot of sense.
      1. subaru335i's Avatar
        subaru335i -
        DI alone is really bad for cold start. It washes the cylinder walls and doesn't burn efficiently when cold. Also, as mentioned the bad carbon buildup on valves.
        DI + PI is much better.
      1. Bowser330's Avatar
        Bowser330 -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        Whatever the actual reason might be, I'm sure we all like the results Click here to enlarge.

        Good to know though. That makes a lot of sense.
        We love the results!

        Look at the RS3, no way extreme modding would have taken off so much so fast if they had DI fueling limitations.