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F30 / F31 / F32 / F33 (2012 - current)
The sixth generation 3 series, chassis code F30. 2013 model year 328i and 335i sedans now in production. Read the F30 frequently asked question thread for all your basic question and dive into all the details in the ultimate F30 information thread.

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  #1  
Old 02-06-2013, 04:52 PM
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K-A K-A is offline
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How much *REAL* (Crank) HP does the N55 motor make?

We have this debate going on, on the F10 Boards, and am curious to see what you guys may have experienced on the matter.

We all know the N55 is underrated, presumedly due to keeping insurance costs on volume models down (as I can attest to as the insurance rate on my 535i was pleasantly surprisingly lower than my previous car) but "how much" is the question, My theorizing and calculations give me the impression we're seeing anywhere from 325-340 crank HP from them.

My reasons for drawing those conclusions:

-A brand new, non broken in 535i was video'd to dyno at 277 RWHP/283 RWTQ (with some miles over 280 will be attainable). Using a 17-20% drivetrain loss, you get over 330+HP.

-The 535i is a 4100 lb car, which has been documented by magazines to attain a Trap Speed from 99-101 MPH regularly (Trap Speed IMO is the most honest indicator of HP). Using "Drag Time Calculators", a car that weighs that much needs about 336 (Crank) HP to trap that high.

-My "real life" experiences dragging older Manual SN-99 Mustang GT's (260 crank HP, dyno's at 225 RWHP, with less drivetrain loss due to not being automatic, but obviously far less efficient than newer BMW's) showed those 3200 lbs GT's did 14.0 @ 100 MPH drag runs, which is about identical to some F10 535i "Magazine runs". Therefore using the "100 lbs = 10 HP rule", a 535i which weighs 800-900 lbs more would need 80-90 more HP to trap at the same times. Which would = around 340 crank HP (280-ish RWHP).

-And finally, I've heard people say 3-Series N55's have dyno'd at around 290 RWHP, which would mean these cars dyno at the wheels closer to their "marketed" HP numbers.

Any experiences from you guys on the matter?
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Last edited by K-A; 02-06-2013 at 04:54 PM.
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  #2  
Old 02-06-2013, 05:03 PM
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Mark K Mark K is online now
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Quote:
Originally Posted by K-A View Post
...My theorizing and calculations give me the impression we're seeing anywhere from 325-340 crank HP from them.

...

-And finally, I've heard people say 3-Series N55's have dyno'd at around 290 RWHP, which would mean these cars dyno at the wheels closer to their "marketed" HP numbers.

Any experiences from you guys on the matter?
I believe you are dead-on with your guess. As to why this is important, I have no clue.

I can only tell you that PPK stage 1 added that much thrill to my ride that I would easily exchange it for minus 30-50 hp at the crank for it (instead of adding 15 hp). What was the thrill? Exhaust note. Because I really don't know what to do with 30-50 hp "extra" in this country (U.S.), but that exhaust note puts the large grin on my face every day over 40 degrees F.
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Last edited by Mark K; 02-06-2013 at 05:06 PM.
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  #3  
Old 02-06-2013, 05:17 PM
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K-A K-A is offline
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Originally Posted by Mark K View Post
I believe you are dead-on with your guess. As to why this is important, I have no clue.

I can only tell you that PPK stage 1 added that much thrill to my ride that I would easily exchange it for minus 30-50 hp at the crank for it (instead of adding 15 hp). What was the thrill? Exhaust note. Because I really don't know what to do with 30-50 hp "extra" in this country (U.S.), but that exhaust note puts the large grin on my face every day over 40 degrees F.
Haha. Yeah, "crank HP" is really BS anyway, we know what the car dyno's at, and what it traps at, so I guess it's just an interesting thing to "guess" the crank HP, as insanely unimportant to the factual statistics we do have at hand.

I agree with you, it's really pointless to have high HP in this country. I live in a congested area and to me it's even "too much" to try and get the most of this 535i. Proof in that? I've already got a speeding ticket, my first in years, and something I never got close to getting when I was happily and purposefully granny driving my sub-270 HP Merc's.
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Ex MB's: 11/10/06 E350 "Sport", 02 S500 w/ Every Option.

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  #4  
Old 02-06-2013, 05:30 PM
Jamesonsviggen Jamesonsviggen is offline
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Your 17-20% drivetrain loss is high for a modern engine. Today manuals are more in line with 10-12% and automatics are more like 15%. The n55 I saw dyno in person put down about 268whp. My guess is crank is 315 or so.
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  #5  
Old 02-06-2013, 05:34 PM
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Originally Posted by Jamesonsviggen View Post
Your 17-20% drivetrain loss is high for a modern engine. Today manuals are more in line with 10-12% and automatics are more like 15%. The n55 I saw dyno in person put down about 268whp. My guess is crank is 315 or so.
Interesting. Was that a Mustang Dyno or Dynojet (Mustang Dynos are always much lower). It's good to see more results from N55 dynos.

I can see 15% on a modern auto. 20% does seem pretty high. Some dyno sheets I've seen tell you to divide by a certain number (.something), and when you do, you usually get the same figure as you would if you just factored in a 15-18% drivetrain loss.

Here's the 277 RWHP Insideline dyno:

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  #6  
Old 02-06-2013, 05:37 PM
Jamesonsviggen Jamesonsviggen is offline
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Quote:
Originally Posted by K-A View Post
Interesting. Was that a Mustang Dyno or Dynojet (Mustang Dynos are always much lower). It's good to see more results from N55 dynos.

I can see 15% on a modern auto. 20% does seem pretty high. Some dyno sheets I've seen tell you to divide by a certain number (.something), and when you do, you usually get the same figure as you would if you just factored in a 15-18% drivetrain loss.

Here's the 277 RWHP Insideline dyno:

Yeah, Insideline got nearly 240whp on he n20 F30 dyno.

The 268whp was at Rogue with a 135 with an exhaust. My car with an exhaust did 220whp on the same dyno. It's load bearing, I think its a Super Flo which is like a Mustang. My car on a Dynojet would be more like 250whp(more now that I have a tune, 280ish)
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  #7  
Old 02-06-2013, 05:40 PM
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Quote:
Originally Posted by Jamesonsviggen View Post
Yeah, Insideline got nearly 240whp on he n20 F30 dyno.

The 268whp was at Rogue with a 135 with an exhaust. My car with an exhaust did 220whp on the same dyno. It's load bearing, I think its a Super Flo which is like a Mustang. My car on a Dynojet would be more like 250whp(more now that I have a tune, 280ish)
Ah, ok that makes senses. Seems like Mustang Dyno's (or equivalents) are showing N55's with under 270 RWHP while the Dynojet's are the ones we see quoted as basically 280+ RWHP.

Of course, with some break in miles, it's normal to see those numbers go up a bit.
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  #8  
Old 02-06-2013, 05:45 PM
Jamesonsviggen Jamesonsviggen is offline
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Quote:
Originally Posted by K-A View Post
Ah, ok that makes senses. Seems like Mustang Dyno's (or equivalents) are showing N55's with under 270 RWHP while the Dynojet's are the ones we see quoted as basically 280+ RWHP.

Of course, with some break in miles, it's normal to see those numbers go up a bit.
Yep!

I take my cars to the heart breaker dynos. They emulate more the actual power that is reaching the ground. Dynojets are best for bragging rights and swinging E-penies lol.

The key was to dyno the other BMW before and after the boost on the same dyno. So reading low or high is one thing, but showing gains is really nice. I picked up 150whp one winter lol. Things get muddled when you start mixing dynos.
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