[DrivesOnPotholes]

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I'm actually surprised that the M240i is making the stated HP, given BMW historic underrating of HP on their engines.

BMW Dyno pull starts at 4:03.

These are the calculated crank engine power with nearly 20% loss. For example, the Golf R makes 263 hp at the wheels.

Summary (HP):
M240: Claim: 374hp/500Nm, Actual: 375hp/572Nm
Golf R: Claim: 320hp/420Nm, Actual: 325hp/478Nm
RS3: Claim:400hp/500Nm Actual: 413hp/543Nm
A45: Claim: 421hp/500Nm Actual: 386hp/418Nm

[XC3LLR8]

That torque is really impressive!

[Brooklyn M240i]

Originally Posted by DrivesOnPotholes

I'm actually surprised that the M240i is making the stated HP, given BMW historic underrating of HP on their engines.

https://www.youtube.com/watch?v=w8PxX0OE4Sc

BMW Dyno pull starts at 4:03.

These are the calculated crank engine power with nearly 20% loss. For example, the Golf R makes 263 hp at the wheels.

Summary (HP):
M240: Claim: 374hp/500Nm, Actual: 375hp/572Nm
Golf R: Claim: 320hp/420Nm, Actual: 325hp/478Nm
RS3: Claim:400hp/500Nm Actual: 413hp/543Nm
A45: Claim: 421hp/500Nm Actual: 386hp/418Nm

I think that video is a lie. I have a photo from when AUDTOID did a dyno showing maximum engine hp to be 420hp.

[Crazy One]

I think bmw on the video has a sunroof. Everybody knows that it is very heavy (62kg) and it is in the worst place to have extra kg. So nobody is taking it.

[G42UPRA]

Originally Posted by Brooklyn M240i

I think that video is a lie. I have a photo from when AUDTOID did a dyno showing maximum engine hp to be 420hp.

It's worth noting that different brand Dynos yield different numbers. Mustang brand dynos always read lower than Dynojet for example.

[PNTDG42]

Originally Posted by meshuggah

It's worth noting that different brand Dynos yield different numbers. Mustang brand dynos always read lower than Dynojet for example.

I agree for the most part but its not really that straight forward usually. A Mustang dyno without correction does tend to read lower than a Dynojet. But Mustang dynos allow for an operator set correction factor. Most Mustang dyno operators already have their software turned up 15% to try and "emulate" Dynojets. So they are cranking you up 15% and then sending you on your way with the impression that you would *still* make even more on a Dynojet. This is usually over-inflating as there is no actual static % difference between the 2. I owned a Dynojet for a while and now my friend owns it. Its not uncommon for people to show up in hopes of seeing their Dynojet numbers crush their Mustang graphs from another shop, only to be disappointed when it reads lower. Dynojet software does not allow operators to set their own corrections. All you can do is choose between typical environmental correction presets (SAE, STD, DIN, and I forget what else). So you will actually see great consistency from one Dynojet to another, assuming the operator knows how to setup the car and equipment correctly and consistently.

[Brooklyn M240i]

Originally Posted by Crazy One

I think bmw on the video has a sunroof. Everybody knows that it is very heavy (62kg) and it is in the worst place to have extra kg. So nobody is taking it.

Don’t all G42 M240i’s have a sunroof?

[G42UPRA]

I agree for the most part but its not really that straight forward usually.

Thanks for the detailed reply. I haven't been anywhere near a dyno in the past ~15 years so I was mostly going off what I seemed to remember (aka mustang dyno = less power).

[donm527]

Originally Posted by Brooklyn M240i

Don’t all G42 M240i’s have a sunroof?

No, you can get without in some countries.

[Crazy One]

Originally Posted by Brooklyn M240i

Don’t all G42 M240i’s have a sunroof?

No, in EU market it is $1000 option that is worth to skip.
And if you will opt-out of the tow hook, you will save some more kg.

[XC3LLR8]

The G42 will never be an ideal track car. If you’re a fan of moonroofs, like me, the weight is meaningless. I almost always drive with it vented, even with the A/C or heater on.

[PP3121]

Love the moonroof. Would not have purchased without. Use it almost daily.

[VIERsr]

Originally Posted by Crazy One

I think bmw on the video has a sunroof. Everybody knows that it is very heavy (62kg) and it is in the worst place to have extra kg. So nobody is taking it.

I don't think it weighs that much, on the M3/4 the additional weight of the sunroof over to the standard carbon roof is 23 kg (click HERE), considering that the standard roof of the G42 is not made of carbon and the optional carbon roof on the G87 M2 saves 6kg, the increase will be even smaller.

[TheJerseyDon]

The VAGs making the HP!

[mecheng77]

I think the B58 probably didn’t change much over the years they just stopped underrating it for newer models to show improvements.
Given it’s reliability and fuel economy, it has great power and torque ratings.

Not sure what’s going on with the Merc??

[Rbcmima]

Originally Posted by Brooklyn M240i

I think that video is a lie. I have a photo from when AUDTOID did a dyno showing maximum engine hp to be 420hp.

I don't know about a lie but yes I have seen other Gen 2 B58s run significantly higher than what this video says. Probably just a user error, Dyno error, or that particular B58 has something wrong with it. Or maybe everybody elses just reads high, who knows. Saw a guy dyno 450whp with just a downpipe and JB4 Map 3 on E20.

[MPR]

I was initially pissed that I couldn't delete the moonroof but now I love that I have it. Like @
XC3LLR8, mine is always open, even now in the dead of winter. Granted, my heat is cranked to 78F+.

[cric.hussey]

Originally Posted by mecheng77

I think the B58 probably didn’t change much over the years they just stopped underrating it for newer models to show improvements.
Given it’s reliability and fuel economy, it has great power and torque ratings.

Not sure what’s going on with the Merc??

The owner commented saying Mercedes found an issue with one of the pumps and it’s being repaired under warranty.
Concerning though… makes you wonder how long the issue was there… and, would it ever have been diagnosed if it wasn’t taken onto a RR???

[mecheng77]

Originally Posted by cric.hussey

The owner commented saying Mercedes found an issue with one of the pumps and it’s being repaired under warranty.
Concerning though… makes you wonder how long the issue was there… and, would it ever have been diagnosed if it wasn’t taken onto a RR???

Exactly, why didn’t it throw a code?

[VirtualGuitars]

I would pay a modest membership fee to Bimmerpost if they would ban all videos from this YouTube channel. 😂😂😂

[cfm56d7b]

Carwow creativity can only be recognized for distracting the reader from the mundane with videos that provide substantial entertainment value.

[Jerry Huang]

Originally Posted by Crazy One

I think bmw on the video has a sunroof. Everybody knows that it is very heavy (62kg) and it is in the worst place to have extra kg. So nobody is taking it.

And it may cause rattling which is super annoying like mine