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      07-12-2012, 12:44 PM   #1
ovekvam
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116i on dyno

Had the 116i on a dyno today, to measure engine power. The car has close to 5000 km on the odometer. The dyno is a Dynapack, the kind that measures directly on the rear hubs. We put 1.00 as conversion factor to flywheel power, so what you see here is the power and torque on the rear hubs.

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Just for reference, BMW says 136 hp and 220 Nm on the flywheel. I have not tuned the engine in any way, and I am running 95 octane fuel.
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      07-12-2012, 12:53 PM   #2
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Great job. Looks like honest figures. Will proably further improve over the next 5-10000 km.
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      07-12-2012, 01:02 PM   #3
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Very interesting, looks like BMW's official figures are in fact slightly underestimated, as expected?
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      07-12-2012, 01:05 PM   #4
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What is the different colors?
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      07-12-2012, 01:20 PM   #5
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The red curve is the first run, and the green curve is the second run. For each run, the power and torque got lower. Seems like the fan could not cool the intercooler well enough, causing the engine to regulate the output down. I am guessing that this also happens at high RPM in all the runs here. My sound based measurements from open roads indicate that the power curve stays flatter at the top when the engine can get enough air

I would say that 138 rwhp indicates that the power is more than slightly underestimated...
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      07-12-2012, 02:18 PM   #6
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I was also watching the turbo boost. From 1700-4500 RPM it stays around 0.85 bar, and then it slides up to around 1 bar at high RPM.
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      07-12-2012, 02:43 PM   #7
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257.7 Nm = 26 kgm = absolutely insane.
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      07-12-2012, 02:55 PM   #8
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That explains how the car can pull itself easily up rather steep hills in sixth gear.
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      07-13-2012, 03:35 AM   #9
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Great info man, thanks for sharing.

Shame it's a heavy car though, otherwise, we could have enjoyed a more tail friendly ride from the same power output, which is defiantly lacking on some level.

D.
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      07-13-2012, 03:57 AM   #10
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Quote:
Originally Posted by qwas View Post
Great info man, thanks for sharing.

Shame it's a heavy car though, otherwise, we could have enjoyed a more tail friendly ride from the same power output, which is defiantly lacking on some level.

D.
This power output will be plenty for going sideways in the winter season. Sliding around in the summer is too expensive because of tire wear.

Notice that the car can also be set up sideways by turning into corners while braking.
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      07-13-2012, 05:22 AM   #11
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I'd love to see how the 120d performs!!
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      07-13-2012, 05:33 AM   #12
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Quote:
Originally Posted by Bogus View Post
I'd love to see how the 120d performs!!
Ditto, I'd love to see see 118i figures too, to use as fuel in combatting the constant boasting from my old man that his Polo GTI has 7kw more than my 125kw...
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      07-13-2012, 06:06 AM   #13
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Well, you guys just have to go to a local dyno to test it, then...
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      07-13-2012, 06:13 AM   #14
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Quote:
Originally Posted by ovekvam View Post
This power output will be plenty for going sideways in the winter season. Sliding around in the summer is too expensive because of tire wear.

Notice that the car can also be set up sideways by turning into corners while braking.
I am well aware of all the driving techniques, as I am an Advance-driving instructor.

I can tell you, I have very little mileage on my 116i, but from my 100KM driving the demo I have tested, the car feels very heavy in the back and has plenty of grip (good thing actually) to be considered tail happy.

But then again, it's no BMW M of any sort

D.
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      07-13-2012, 06:25 AM   #15
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My 116i M Sport is set up with 205-tires in all four corners, and it is very nicely balanced. The suspension seems to compensate a lot for throttle inputs, so it is hard to bring it out of balance with throttle inputs. Due to the good balance, it does however react very well to the steering wheel. When you are on the limit, the car can often be brought into a slide simply by steering too much. This is of course easier during trail braking than a corner exit.

Once the car is sideways, it is easier to control by the throttle, and the virtual differential brake feature helps a lot.
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      07-13-2012, 06:55 AM   #16
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Quote:
Originally Posted by ovekvam View Post
Well, you guys just have to go to a local dyno to test it, then...
I would gladly, sadly mine is coming till September!!

The wait is killing me!! lol
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      07-13-2012, 11:25 AM   #17
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Quote:
Originally Posted by ovekvam View Post
This power output will be plenty for going sideways in the winter season. Sliding around in the summer is too expensive because of tire wear.

Notice that the car can also be set up sideways by turning into corners while braking.
I second that.
Try sliding with a Goodyear Eagle F1 Asymmetric 2,
and you will find out that is practically impossible.

No kidding, the grip with those tires is unimaginable.

I turned off all traction controls completely, got on Sports mode and got to a corner with approx 50 kmh while trying hard to loose the grip, nothing happened.
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      07-13-2012, 12:46 PM   #18
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Quote:
Originally Posted by max2005b View Post
I second that.
Try sliding with a Goodyear Eagle F1 Asymmetric 2,
and you will find out that is practically impossible.

No kidding, the grip with those tires is unimaginable.

I turned off all traction controls completely, got on Sports mode and got to a corner with approx 50 kmh while trying hard to loose the grip, nothing happened.
In that case you were simply not going fast enough to reach the limit. I don't have any problems going over the limit with my Michelin Pilot Sport 3 tires, which should have around the same grip level as your Goodyears. Maybe the car understeers more if you run wider rear tires than front tires.
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      07-13-2012, 01:31 PM   #19
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I have the same setup, 245 rear, 225 front
Of course its possible to slide, but it takes a bit effort
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      10-20-2012, 06:14 AM   #20
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116I vs Cooper S vs GT86/BRZ



On paper: (dyno shows lb ft, not nm)
Cooper S: 184hp@5500rpm - 240nm@1600-5000rpm (136g CO2)
BMW 116I : 136hhp@4400rpm - 220nm @1350-4300rpm (about 130g CO2)
BRZ/GT86: 200hp@7000rpm - 205nm@ 6400-6000rpm (181g CO2)

Took a dyno from Perrinperformance and tried to add Oves 116I numbers. - yellow line.
GT86 -green line.
Mini Cooper S - pink.

The yellow line is not that accurate, and the dynos used are different. But tought it would be funny to see.
I own a Cooper S. And have test driven both the GT86 and 116I for short trips. Considering either the GT86 or 116I/118I as my next/future car.

GT86 have a short powerband and you have to work to stay in it. Basically you only have high-range powerband between 7500-4700=2800RPM.
In tight hairpins you will easily get into the torque dip/lower HP output using 2. gear. It is also a car you do not wish to hit the rev limiter in since the fuel/power cut is a little annoying. Due to lack of torque you never get the real sensation of getting pushed hard back into the seat. Throttle response good!

Cooper S have a huge powerband thanks to its low and midrange torque and good HP from lowrange to high rpms. You basically have a good lowrange, midrange, and a pretty good high range. Great output between 6500-2500=4000RPM. but I could easily say 5000RPM+ thanks to low weight and extreme torque from 1500RPM and even lower. There is no need to completely max out the revs since the midrange is so effective. So it is not as exiting to rev as the 86, but does not feel as dull as the 116I.
It does have a little turbo-lag from low revs in high gears, minimal lag at higher RPMs. I would say it is pretty impressive.
Feels more powerful at low revs than you would think looking at the dyno graph. (Same goes for 116I.)
It does feel much more powerful than the 116I at lower revs even tough HP figures are about the same! (more torque and about 200 kg lighter probably helps to push you harder into the seat)
It sounds a little better too.

116I have a great low and midrange power, and also the ability to rev pretty high. But peak HP and torque in the midrange makes you want to shift long before redline. It does not have the character of a sporty engine. Im guessing there is little point going far beyond 5000rpm. I did not find it useful to go near the redline at all.

Paper vs dyno:
The 86/BRZ is about as expected for a sporty 2.0L NA engine in a 1200+kg car, it has a sporty character. But it lacks torque. If the dip in power around 4000rpm were a bump instead the engine would have felt much much better! The dip will probably be very annoying in autoX where you often drive in 2nd gear. You would either loose time in 2. gear due to lack of mid-range power. Or loose time when going back into first, and then back to 2nd.

116 and Cooper S are both very underrated. Especially the torque figures!
The low-end HP on the 116I is pretty impressive too!

Last edited by BMW-RaceR; 10-20-2012 at 07:37 AM.
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      10-20-2012, 06:30 AM   #21
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Thanks for sharing. Interesting graph.
I agree with your conclusions.
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      10-20-2012, 07:39 AM   #22
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Quote:
Originally Posted by ovekvam View Post
Thanks for sharing. Interesting graph.
I agree with your conclusions.
Edited the picture/graph in my previous post. The HP in 116I was a little higher than it should have been...
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