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      07-09-2014, 01:21 PM   #1
JMN
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F80 M3 vs E92 M3 Dyno Numbers by Motortrend

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On K&N's dyno, seems to read quite a bit lower than some others:

http://blogs.motortrend.com/1407_on_...eneration.html

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      07-09-2014, 01:24 PM   #2
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All that matters is the relative difference.

The E90 on this dyno was way lower as well. (I also don't see enough fans, etc)
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      07-09-2014, 01:56 PM   #3
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Quote:
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All that matters is the relative difference.

The E90 on this dyno was way lower as well. (I also don't see enough fans, etc)
That was the first thing I was thinking too, where are the fans? This is going to start another dyno convo, it would be so cool if there was one type of dyno, hermitically sealed in a room where all conditions were the same all the time. Were seeing ranges of 370 to the wheels up to 420 to the wheels. Whatevs. Cars still amazing
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      07-09-2014, 02:00 PM   #4
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Yeah, the relative difference is still huge. Way more than the 11 hp difference that's stated from the factory.
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      07-09-2014, 02:00 PM   #5
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306 whp for an E9x M? That is a very low result, even in comparison with the F8x at 380. Maybe the F8x not broken in.
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      07-09-2014, 02:01 PM   #6
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So strange, 10hp apart per BMW, 70hp apart on this dyno.
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      07-09-2014, 02:04 PM   #7
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Damn the F8x makes more power at 4500rpm that the E9x makes at 8000.
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      07-09-2014, 02:08 PM   #8
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But how did it SOUND on the dyno? Let's keep our priorities straight.
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      07-09-2014, 02:09 PM   #9
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Quote:
Originally Posted by stressdoc View Post
306 whp for an E9x M? That is a very low result, even in comparison with the F8x at 380. Maybe the F8x not broken in.
The lowest S65 dyno that I have ever seen in my life that I could believe was 330 WHP... that would make the F80x at 406 WHP; far mooore believable but still on the lower end. This can't be a dynojet and if it is; what settings r they using?
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      07-09-2014, 02:10 PM   #10
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I wonder what tuners will do to get the top end power on the F8x to the next level.
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      07-09-2014, 02:11 PM   #11
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You can get any numbers you want to out of a dyno jet.
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      07-09-2014, 02:11 PM   #12
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Seems like a very low reading dyno, but having them both there provides a nice point of reference for the real horsepower difference between the two cars.
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      07-09-2014, 02:16 PM   #13
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The absolute numbers matter little. Assuming they didn't mess with settings between the two dynos, that's an unreal difference in power.
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      07-09-2014, 02:18 PM   #14
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I'm definitely not an expert, but...

1) Assume E9X makes 414 HP at the flywheel
2) Assume proportionate drivetrain/dyno loss

Loss = 1 - (306/414) = 26%
F8X HP at the flywheel = 379/( 1 - Loss ) = 379/.74 = 513 HP

Obviously I'm making some assumptions and 513 BHP seems ludicrously high, but WOW!
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      07-09-2014, 02:18 PM   #15
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Quote:
Originally Posted by Never Convicted View Post
But how did it SOUND on the dyno? Let's keep our priorities straight.
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      07-09-2014, 02:23 PM   #16
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Quote:
Originally Posted by ASAP View Post
The lowest S65 dyno that I have ever seen in my life that I could believe was 330 WHP... that would make the F80x at 406 WHP; far mooore believable but still on the lower end. This can't be a dynojet and if it is; what settings r they using?
that's what my e9x dyno'd at. 332 whp stock

and I would say the apparent lack of fans

you can also see how both cars struggle badly at redline compared to every other dyno I have seen. this is likely due to lack of proper airflow. both cars seem to be down about 10-12% power
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      07-09-2014, 02:24 PM   #17
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This will take some magic. 1024 bit and this motor turns into a NA type monster over 6k rpm. Valvetronic magician required



Quote:
Originally Posted by Buddy Revell View Post
I wonder what tuners will do to get the top end power on the F8x to the next level.
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      07-09-2014, 03:08 PM   #18
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Quote:
Originally Posted by Never Convicted View Post
But how did it SOUND on the dyno? Let's keep our priorities straight.
hahahahahahahahahahahahahahahaha, classic.
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      07-09-2014, 03:25 PM   #19
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70hp over the E92 M3. That is freakish underrating. Now, let's just hope BMW don't cut that down to the ankles soon by a SW "update"...
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      07-09-2014, 03:26 PM   #20
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Quote:
Originally Posted by Buddy Revell View Post
I wonder what tuners will do to get the top end power on the F8x to the next level.
Tricks with the boost. The BMS folks have apparently already hit 500whp with a dose of E85 tune only.
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      07-09-2014, 03:44 PM   #21
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Quote:
Originally Posted by tdizzle View Post
Tricks with the boost. The BMS folks have apparently already hit 500whp with a dose of E85 tune only.
They are using E30, not E85. Pretty big difference.
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      07-09-2014, 03:46 PM   #22
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Hmm, I'd like to understand more about the airflow restrictions (potential) or cooling restrictions.

NORMALLY an N/A motor is going to give a better dyno as IATs spike - i.e. a turbocharged motor is going to suffer more due to temp than an N/A motor.

Nonetheless, I'd like to understand if there were airflow restrictions here...
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