Same BHP but high NM?

[wt_know]

520i - 184bhp , 270Nm
520d - 184bhp, 380Nm

based on technical fundamentals, isn't bhp & nm goes hand-in-hand
which means you cannot build a car with merely 100bhp but 400/500nm torque because the higher the torque, naturally bhp also go up

but for 520i/520d, bhp remain the same but torque increase by a freaking 110nm
with the 130bhp rule for cat a, will we see more low bhp with high torque car? hehe

ie: Volkswagen Passat 1.4 TSI DSG (A) (passat is a big family sedan) > 1.4L nia, 122bhp nia, 200Nm (same as e60 520i)

 

[wt_know]

Re: Same BHP but high NM?

volvo s60/s80 diesel > 1560cc, 115bhp, 270Nm (same as f10 520i)

cat A ... huat ah!!!

 

[wt_know]

Re: Same BHP but high NM?

audi A1/A3 TFSI sportback > 1390cc, 122bhp, 200Nm (same as e60 520i)

hopefully cat A tank ... can get a A-sportback

 

[zhelinm]

Re: Same BHP but high NM?

520i - 184bhp , 270Nm
520d - 184bhp, 380Nm

based on technical fundamentals, isn't bhp & nm goes hand-in-hand
which means you cannot build a car with merely 100bhp but 400/500nm torque because the higher the torque, naturally bhp also go up

but for 520i/520d, bhp remain the same but torque increase by a freaking 110nm
with the 130bhp rule for cat a, will we see more low bhp with high torque car? hehe

ie: Volkswagen Passat 1.4 TSI DSG (A) (passat is a big family sedan) > 1.4L nia, 122bhp nia, 200Nm (same as e60 520i)

BHP is very dependent on RPM. One of the factors for horsepower calculation is the RPM. If your peak torque occurs at a higher rpm, your corresponding peak BHP will be higher as well. If your engine can pull higher rpm with lower torque, you will get higher BHP as well. Diesel engines are blessed with tons of torque with low rpm. Petrol engines are lower in torque but can rev higher. So, both even out to be similar BHP. You will get similar max speed with both engines as the BHP are similar. Diesel engine overall drive ratios will typically be lower than those of petrol variants as diesel engines have a smaller rpm range compared to the petrol engines.

 

[seanskye]

Same BHP but high NM?

The rated BHP is produced only at 'peak' RPM, meaning if you have a small engined ride you'd likely have to keep the RPMs in the 5-6k region (7-9k region for the 'tiong chias'). Torque on the other hand might actually drop toward the end due to the drive.

Compare this with a large cc ride... hence the saying "there's no replacement for displacement".

And diesel vs. otto engine power curves typically look like this...

 

[wt_know]

Re: Same BHP but high NM?

ok, here is the million dollar questions

can we have a 130bhp & 400Nm car? steam ah ...

 

[Jason8822]

Re: Same BHP but high NM?

ok, here is the million dollar questions

can we have a 130bhp & 400Nm car? steam ah ...

Yes.
Hybrid with small engine and big electric motor

 

[Jason8822]

Re: Same BHP but high NM?

Torque is measured while Hp can only be calculated as : Torque x rpm
On a dyno, actually its measuring torque on wheel and calculating the hp.

For 520 and 520d , same max hp but developed at diff rpm.
520 : 184hp @ 5000-6250rpm
520d : 184hp @ 4000rpm

From this we can deduce that the torque of 520 at 5000rpm is lower than that of 520d at 4000rpm.

 

[Baby1M]

Re: Same BHP but high NM?

Torque is measured while Hp can only be calculated as : Torque x rpm
On a dyno, actually its measuring torque on wheel and calculating the hp.

For 520 and 520d , same max hp but developed at diff rpm.
520 : 184hp @ 5000-6250rpm
520d : 184hp @ 4000rpm

From this we can deduce that the torque of 520 at 5000rpm is lower than that of 520d at 4000rpm.

Based on just figures and all things equal e.g. tyres, driver, hp, Nm and etc... 520d has quicker century sprint????

 

[Slow_poke_driver]

Re: Same BHP but high NM?

Actually the answer to your question is very simple.

It has nothing to do with big engine or small engine. And it has nothing to do with whether the power is linear or not.

The answer is RPM.

You need to look at what rpm that torque comes out.

E.g. 520i, 270Nm from 1250rpm to 4500 rpm
520D, 380Nm from 1750-2750rpm

That means, although on paper, the 520D has 380Nm of torque, you actually don't have 380Nm of torque if you don't squeeze the throttle while keeping the engine at

 

[Slow_poke_driver]

Re: Same BHP but high NM?

Based on just figures and all things equal e.g. tyres, driver, hp, Nm and etc... 520d has quicker century sprint????

Officially, at least according to bmw, they are equally fast (or slow).

 

[casper77]

Re: Same BHP but high NM?

Bro, love ur reply.... from now on i will play tokyo drift song everytime get into my ride... so i can hve the yam3 feel... hehehe

 

[MW]

Re: Same BHP but high NM?

Everyone please bear in mind the most important bit of that article....


View attachment 58972

 

[Red_Bean_Bun]

Re: Same BHP but high NM?

Did you know that buses have .....

Hp-280
Toque-1280nm

So can easily move 80 people on the bus from standstill. But cannot go track .........

 

[LimPeh]

Re: Same BHP but high NM?

Did you know that buses have .....

Hp-280
Toque-1280nm

So can easily move 80 people on the bus from standstill. But cannot go track .........

Watch this:

[video=youtube;5KiC03_wVjc]https://www.youtube.com/watch?v=5KiC03_wVjc&feature=youtube_gdata_player[/video]

 

[Red_Bean_Bun]

Re: Same BHP but high NM?

No wonder now the vans are on lane 2 on the expressway ....

 

[davidtch]

Re: Same BHP but high NM?

BMW Asia needs to lobby BMW AG to produce 114d/214d/314d/514d.

 

[wt_know]

Re: Same BHP but high NM?

it's coming ... with A1/A3 1.4L TFSI conquering Cat A ... BMW and Merc will retaliate ... for sure

BMW Asia needs to lobby BMW AG to produce 114d/214d/314d/514d.

 

[spidy]

Re: Same BHP but high NM?

Hi all,

Would like to share my thoughts on this topic on the 520d.

I had been driving the 520d m-sport package (PI car) for about 6 months and below are what i can gather:

- The consumption of the car is the main plus points. Although factory claim is 22.2km/l, after almost 25000km, I have an average of 14km/l (I'm not exactly a light footed guy). Though on a good sat morning when traffic is light, i do get about 18~20lm/l. The savings is quite significant. Base on my friend who drives a 520i, he getting an average of 8km/l (correct me if i'm wrong). With the cheaper diesel price, i'm paying about 10 cents per km while the petrol version is paying 20 cents per km. With my annual mileage of about 50000km and a diesel tax of $800, I'm having a savings of about $4000 a year which I can put into modding.

- The clattering sound is definitely there, sound like a taxi when at standstill. But once you are in the car, the insulation will cover up that noise. The cabin is not noisy at all. Once you move off, the clattering noise is gone. Only the deep engine sound can be heard when you move up the reeve. I kinda like it as it makes me feel like I'm driving a pretty powerful car. Hehehe.

- Being diesel engine has the advantage of very high torque at the very low end. And also being a diesel engine, the redline is also much lower. The car do reeves pretty fast to 4000 rpm but you won't get more power after 4000 rpm hence makes you feel the car being out of breath at times. But by the time you are reeving to that, you are already at 160kph+. I did try to push the car with full load and I did hit about 230kph but I have no confidence in the suspension so didn't go further but it seems kinda max out already. Keeping below 130kph and make minor changes to the way I drives make the car go really fast effortlessly. Occasion wheel spin do occur at standstill if you floor the pedal.

This is actually my first diesel car I own and I can say that I will not be looking back to petrol car unless I'm looking for sports car in the future.

Just my little thoughts.

View attachment 59265
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View attachment 59266
View attachment 59267

 

[kenntona]

Re: Same BHP but high NM?

Did you know that buses have .....

Hp-280
Toque-1280nm

So can easily move 80 people on the bus from standstill. But cannot go track .........

Not a fair comparison lah. P/W ratios have to be consider.

A better comparison is against taxis.