BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > Finally put my 120d on a dyno.
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      11-08-2018, 05:44 AM   #1
Chocolatero€
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Finally put my 120d on a dyno.

Hi folks !

Today wasnt the best day for it but the guy had space for me so I went for it.
The car was tunned like 2 months ago, works good but I wanted to know how much power I have

Sadly I coudnt take better (and more pics) because I wasnt allow to be inside of it

The result?

172 whp @3787rpm (its Xdrive)
torque 358Nn@3000rpm also at the wheels

Estimated is 233bhp (to the engine) and 440Nm .

Weather conditions

13.6 celcius degrees, 1008mBra and 91% of humidity (so bad)



Happy with the car, it would probably have better performance with less temperature and humidity
It runs like a charm and the fuel consumption is pretty good : 5.6 litre/ 100km not sure if is around 49mpg (highway) and around 6.2l /100km (city)

Graphs




My car



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120d Xdrive //M 2014

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      11-08-2018, 05:48 AM   #2
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Top cab boet!
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      11-08-2018, 07:42 AM   #3
ovekvam
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From 233 hp in the engine to 172 hp at the wheels? That is more than 26 percent loss.

For reference, my previous car, an unmodified 116i, is specified to have 136 hp in the engine, and the dyno said 139 hp at the read hubs. That is a loss of minus 2 percent! :-)
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      11-08-2018, 09:25 AM   #4
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Quote:
Originally Posted by ovekvam View Post
From 233 hp in the engine to 172 hp at the wheels? That is more than 26 percent loss.

For reference, my previous car, an unmodified 116i, is specified to have 136 hp in the engine, and the dyno said 139 hp at the read hubs. That is a loss of minus 2 percent! :-)
That dyno probably measured to the crank. Sometimes you have more power than the factory says.

Its also depends what dyno are you using, FWD, RWD and AWD, etc.

here you have a calculator for it (is not 100% accurate) https://www.mk5cortinaestate.co.uk/calculator4.php

In general a FWD lose around 20% from crank to the wheels .


For example this 320d (same engine, same ECU, same dyno, but RWD)
Got 103.7kw (139whp) stock and 126kw (169whp) after remap

a 120d from factory have 184hp, so if you use that calculator it would give you 180hp. So thats means with that RWD you lose around 24% from crank to wheels .





Anyways, what matters is what you have at the wheels
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120d Xdrive //M 2014

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      11-08-2018, 09:54 AM   #5
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The dyno I used measured at the rear hubs, where the loss is somewhat lower than when rolling resistance is involved.

When you measure on the wheels, it is common to lose around 15 percent with FWD, 17 percent with RWD, and 20 percent with AWD. Less if you have a powerful engine.

I would guess 18-20 percent loss with your car, making it 210-215 hp on the crank.
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      11-08-2018, 03:42 PM   #6
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I dont know from where did you take the numbers But like I said, it doesnt matters how much do you have on the crank but at the wheels
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      11-08-2018, 03:50 PM   #7
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Quote:
Originally Posted by Chocolatero€ View Post
I dont know from where did you take the numbers But like I said, it doesnt matters how much do you have on the crank but at the wheels
I have been interested in the topic for ĺ couple of decades, and it is my own ballpark figures based on reading a lot about it and seeing quite a few measurements.

I also used to make my own software for dyno testing, and we had a lot of tests to calibrate against other measurements.

But in the end, it is a bit of guessing involved. I agree that wheel power counts, and it is my opinion that this is what the car manufacturers should specify, not crank power.
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      11-08-2018, 03:51 PM   #8
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Since xDrive needs to be dyno'd AWD, you have drivetrain loss (normally 20-25% depending on dyno, vs 10-15% RWD) that's why you'll see much lower numbers on xdrive.
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      11-08-2018, 03:52 PM   #9
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Quote:
Originally Posted by ovekvam View Post
and it is my opinion that this is what the car manufacturers should specify, not crank power.
It might sell less cars
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      11-08-2018, 04:02 PM   #10
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Quote:
Originally Posted by Chocolatero€ View Post
It might sell less cars
Well, change from horsepower to kW at the same time, and people will not have old references.
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      12-07-2018, 11:33 AM   #11
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What make is the exhaust , or is it just the backbox ?.
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      12-08-2018, 04:15 AM   #12
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Quote:
Originally Posted by 120d View Post
What make is the exhaust , or is it just the backbox ?.
Its a custom made exhaust with the 135i rear diffuser
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      01-21-2019, 01:33 AM   #13
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Interesting numbers!

Can I ask what you have done to the car? Just got an Xdrive myself!

By the way, is yours manual or auto?

Thanks
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      01-23-2019, 12:18 PM   #14
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Quote:
Originally Posted by One20d Xdrive View Post
Interesting numbers!

Can I ask what you have done to the car? Just got an Xdrive myself!

By the way, is yours manual or auto?

Thanks

just a remap ! the rest is stock.

Its a manual one
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