M5 BMW M5 F10 - Test Drives/Reviews

[Sunny]

^I meant they measured the WHP and added some standard "loss factor" and stated the calculated HP at the crank.

 

[klier]

Yeah, that could have been the case...which makes me wonder, how does one calculate this 'loss factor'? It must be different for ever model/brand..

But the latest trend in BMW dyno tests result in underpowered figures by BMW on quite a few occasions, which is why I thought it could very well be at the wheels. Nevertheless, I guess we have to wait for DeDe for a verdict on that one But going by the vid? WHP...

 

[Sayyaaf]

^ But that would be pointless, as you test the wheel horsepower with a dyno. You can read the manual for the crank, I can't see a way to simply test that?
I think it's at the wheels, there's more torque too...



How, if you want to make it 3.9 secs?

There is no way around it, 1st gear, DSC off and full throttle is just another way of making a fast U-turn.

 

[klier]

^^^ you have no idea how much I like that

Oh and get yourself an avatar of your M5, man

 

[Sayyaaf]

^^^ you have no idea how much I like that

Oh and get yourself an avatar of your M5, man

I really want to. I have promised Nas to take some fotos but got overwhelmed with work, I barely sleep last 3 days.

I promise soooooon.

 

[tristatez28lt1]

Yeah, that could have been the case...which makes me wonder, how does one calculate this 'loss factor'? It must be different for ever model/brand..

But the latest trend in BMW dyno tests result in underpowered figures by BMW on quite a few occasions, which is why I thought it could very well be at the wheels. Nevertheless, I guess we have to wait for DeDe for a verdict on that one But going by the vid? WHP...

Not whp, guaranteed. The torque number would be insanely high using even low loss ratings (707rwnm ~ 806fwnm with only 14% loss). Those numbers are at the crank.

 

[klier]

Not sure if I understand that one, but you are clear. So this one has 3 more hp, and like 25 more Nm compared to factory times.
It will be interesting to see a few more M5s on the dyno, for sure!

 

[Sunny]

Yeah, that could have been the case...which makes me wonder, how does one calculate this 'loss factor'? It must be different for ever model/brand..

Forget model/brand, it even varies car to car based on mileage, run in, manufacturing tolerance. Heck, it even changes across the rev range, as at higher speeds the frictional loss is higher. So, no, the 'loss factor' is not an accurate figure, just a very rough approximation. Of course, bigger shops have a engine dynos where you can measure the torque at the crank directly.

 

[speed_kills]

Yeah, that could have been the case...which makes me wonder, how does one calculate this 'loss factor'? It must be different for ever model/brand.. But the latest trend in BMW dyno tests result in underpowered figures by BMW on quite a few occasions, which is why I thought it could very well be at the wheels. Nevertheless, I guess we have to wait for DeDe for a verdict on that one But going by the vid? WHP...

This one isn't. Seen another review of a russian guy where it put out 560hp. It makes what BMW says it makes, give it or take it couple hp.

 

[-=Hot|Ice=-]

[video=youtube;V2_FvUTddgw]http://www.youtube.com/watch?feature=player_embedded&v=V2_FvUTddgw#![/media]

 

[DeDe]

Just for comparison, here's the CLS63 AMG with Performance Package on the same dyno. What a torque!

I think these are crank-figures.

Model: M5 F10 vs. CLS63 AMG PP
Power: 563 hp / 6283 rpm vs. 533 hp / 5129 rpm
Torque: 707 Nm/ 4845 rpm vs. 783 Nm / 4090 rpm

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[klier]

So it's at the crank.
But if it were at the wheels, how many hp would be looking at then?

 

[Deckhook]

So it's at the crank.
But if it were at the wheels, how many hp would be looking at then?

approx. 640hp and 800Nm if the loss is accurate which sounds low to begin with cause as far as I'm aware a DCT has more loss than a traditional manual.

 

[chonkoa]

563 WHP ? hard to believe

Me too, I wonder the last time that Dyno was calibrated.

 

[chonkoa]

563 WHP ? hard to believe

I find that hard to believe as well, I wonder when that Dyno was last calibrated..

 

[chonkoa]

approx. 640hp and 800Nm if the loss is accurate which sounds low to begin with cause as far as I'm aware a DCT has more loss than a traditional manual.

And how did you arrive at that number?

 

[Deckhook]

And how did you arrive at that number?

563hp and multiple by 1.14 for the 14% though it may be that this should be slightly less when calculating back which is why I wrote approx.

Can't be arsed to do the calculations properly but I think it's roughly between 630-640hp.

 

[chonkoa]

Pardon the double post, problem with the internet speed..

 

[chonkoa]

563hp and multiple by 1.14 for the 14% though it may be that this should be slightly less when calculating back which is why I wrote approx.

I guessed as much, which is the mistake most people make.
In reality the parasitic losses are not a fixed percentage but an offset.

 

[Deckhook]

I guessed as much, which is the mistake most people make.
In reality the parasitic losses are not a fixed percentage but an offset.

I'm sure Monster or someone similar could get a more accurate figure.