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2010 2011 BMW 5 Series Forum F10 BMW 5-Series (F10) Forums General 5-Series Sedan and Wagon (F10 / F11) Forum 2011 BMW 535i Dyno Test Results Video
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      08-28-2010, 01:17 PM   #23
tadtaggert
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Quote:
Originally Posted by 1SerieStud View Post
Based on what premises? This actually makes little sense. I have driven both and I own an N55...my N55 feels a tad quicker.
Dyno test from a shop I use. The N54 (335i) was mine, have seen two with N55 lately, both show pretty much the same difference.

Not trying to hit on either, both are very good, agree with comments that the N55 is more economical and runs cooler. Another item to consider they had to raise the boost on the N55 to 9 , N54 is 8 or 8.5 if I remember correctly.
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      08-28-2010, 01:23 PM   #24
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Quote:
Originally Posted by tadtaggert View Post
Dyno test from a shop I use. The N54 (335i) was mine, have seen two with N55 lately, both show pretty much the same difference.

Not trying to hit on either, both are very good, agree with comments that the N55 is more economical and runs cooler. Another item to consider they had to raise the boost on the N55 to 9 , N54 is 8 or 8.5 if I remember correctly.
Unless all cars were tested in the same day, same weather conditions, and within minutes of eachother, there is yet a lot to be proven
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      08-29-2010, 01:17 PM   #25
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Quote:
Originally Posted by sois View Post
Hmmm, I have driven both as well and is quite clear to me that the N54 is a lot more responsive (less lag) and is generally quicker. I was able to modulate a 6sp N55 a bit better than an automatic N55 (dreadful compared to an N54 automatic). However, the 6spd N54 walked on the 6spd N55. This discrepancy is made quite clear by BMW with the new 335is coupe and cab (fitted with the N54 engine and listed with 320hp and 332tq). These are the values N54 engine owners suspected were more realistic all along. The N55 stock does not possess the output that the stock N54 engine possesses and this has been confirmed with more realistic dyno tests.

From what I have read and having driven cars with both engines and auto/6spd combos this is as clear as day to me (the superior quickness/responsiveness of the N54). However, they are both fantastic engines and the N55 I suspect is much more economical and easy for BMW to handle (I believe the N55 runs cooler as well). I can only imagine how many buyers think they are getting the same engine though (twin turbo versus twin scroll terminology...). Clever marketing.

Anyway, Cheers!
+1. see: http://www.e90post.com/forums/showthread.php?t=423269
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      08-30-2010, 07:28 PM   #26
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Quote:
Originally Posted by sois View Post
Hmmm, I have driven both as well and is quite clear to me that the N54 is a lot more responsive (less lag) and is generally quicker. I was able to modulate a 6sp N55 a bit better than an automatic N55 (dreadful compared to an N54 automatic). However, the 6spd N54 walked on the 6spd N55. This discrepancy is made quite clear by BMW with the new 335is coupe and cab (fitted with the N54 engine and listed with 320hp and 332tq). These are the values N54 engine owners suspected were more realistic all along. The N55 stock does not possess the output that the stock N54 engine possesses and this has been confirmed with more realistic dyno tests.

From what I have read and having driven cars with both engines and auto/6spd combos this is as clear as day to me (the superior quickness/responsiveness of the N54). However, they are both fantastic engines and the N55 I suspect is much more economical and easy for BMW to handle (I believe the N55 runs cooler as well). I can only imagine how many buyers think they are getting the same engine though (twin turbo versus twin scroll terminology...). Clever marketing.

Anyway, Cheers!
If so, why does the heavier f10 have a faster acceleration at higher speeds?

Left column 2010 535i and right column F10 535i


TEST DATA
Acceleration to mph
0-30 2.0 sec 2.1 sec
0-40 2.8 3.1
0-50 4.2 4.2
0-60 5.5 5.6
0-70 7.1 7.2
0-80 9.3 9
0-90 11.4 11.2
0-100 13.9 13.8
0-110 18.4 17.6
0-120 22.2 21.6
Passing, 45-65 mph 2.6 2.7
Quarter mile 14.1 sec @ 100.6 mph 14.1 sec @ 101.0 mph
Braking, 60-0 mph 112 ft 109 ft
Top-gear revs @ 60 mph 2150 rpm 1900 rpm

Quote "Our quarter-mile time of 14.1 seconds was identical, and in fact the trap speed was up from 100.6 mph to 101.0. The 60-mph-dash was a tenth slower at 5.6 seconds, while times to the higher speeds were improved (21.6 seconds to 120 mph beats the twin-turbo featherweight by six-tenths). That's impressive, especially if the fuel economy ends up equal or better."

Read more: http://www.motortrend.com/roadtests/...#ixzz0xdbhkfkE

Quote:
Originally Posted by DaveinSF View Post
your link has posts with differing views

Last edited by bm323; 08-30-2010 at 07:35 PM..
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      08-30-2010, 07:32 PM   #27
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Quote:
Originally Posted by bm323 View Post
If so, why does the heavier f10 have a faster acceleration at higher speeds?

Left column 2010 535i and right column F10 535i


TEST DATA
Acceleration to mph
0-30 2.0 sec 2.1 sec
0-40 2.8 3.1
0-50 4.2 4.2
0-60 5.5 5.6
0-70 7.1 7.2
0-80 9.3 9
0-90 11.4 11.2
0-100 13.9 13.8
0-110 18.4 17.6
0-120 22.2 21.6
Passing, 45-65 mph 2.6 2.7
Quarter mile 14.1 sec @ 100.6 mph 14.1 sec @ 101.0 mph
Braking, 60-0 mph 112 ft 109 ft
Top-gear revs @ 60 mph 2150 rpm 1900 rpm

Quote "Our quarter-mile time of 14.1 seconds was identical, and in fact the trap speed was up from 100.6 mph to 101.0. The 60-mph-dash was a tenth slower at 5.6 seconds, while times to the higher speeds were improved (21.6 seconds to 120 mph beats the twin-turbo featherweight by six-tenths). That's impressive, especially if the fuel economy ends up equal or better."

Read more: http://www.motortrend.com/roadtests/...#ixzz0xdbhkfkE
+1! Half of these people don't have a clue of what they are talking about. The fact that the N55 is setting the standard for the next generation M3 speaks for itself. It will all be evident in due time. No point in arguing now, and there is a reason for which BMW has manufactured the N55 in replacement to the N54
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      08-30-2010, 09:04 PM   #28
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Quote:
Originally Posted by 1SerieStud View Post
The fact that the N55 is setting the standard for the next generation M3 speaks for itself.
You actually believe that the N55 will be in the next gen M3?
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      08-31-2010, 06:32 AM   #29
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Quote:
Originally Posted by tadtaggert View Post
You actually believe that the N55 will be in the next gen M3?
Are you unable to read or just pretending to? I said this engine will create a baseline/standard for the next generation M3. So, to answer your question more directly: I am 100% that the N55 will NOT be on the M3, but I am also very sure that a variation of the M3 will most likely be. Discussions regarding this have already surfaced.
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      08-31-2010, 06:58 AM   #30
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Quote:
Originally Posted by 1SerieStud View Post
Discussions regarding this have already surfaced.
All anyone knows right now is that the next gen M3 will be FI, though there are some indications that the F30 will be a bit larger than the E90/92.

Given the output of the N55 I'd be very surprised to see an S55, I don't see the M potential.
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      09-03-2010, 04:09 PM   #31
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http://www.caranddriver.com/reviews/...dan-quick_test

Doesn't look like they tested the different engines back to back but seems like the N55 is the same if not slightly quicker.
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      09-03-2010, 07:36 PM   #32
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Quote:
Originally Posted by tk005x View Post
http://www.caranddriver.com/reviews/...dan-quick_test

Doesn't look like they tested the different engines back to back but seems like the N55 is the same if not slightly quicker.
For easy read, quoting car and driver above link

"How Does It Drive?

Nearly identically to the N54-powered 335i: It’s fast, smooth, and extremely stable. With the announcement of the move to the single-turbo engine, enthusiasts (including us) cried foul. We believed the N54’s output had been underrated, and that the N55, although matching it in advertised output, would be weaker in reality. But all of that can be put to bed. Our 2011 335i was just as quick as the twin-turbo car, reaching 60 mph in the same sprightly 4.8 seconds. The quarter-mile flew by in 13.6 seconds at 106 mph, a tenth behind the quickest twin-turbo sedan we tested. After the century mark, however, the new mill picks up steam, reaching 140 mph nearly a full second quicker."

For easy comparison with Motortrend's similar results I mentioned above

Quote:
Originally Posted by bm323 View Post
If so, why does the heavier f10 have a faster acceleration at higher speeds?

Left column 2010 535i and right column F10 535i


TEST DATA
Acceleration to mph
0-30 2.0 sec 2.1 sec
0-40 2.8 3.1
0-50 4.2 4.2
0-60 5.5 5.6
0-70 7.1 7.2
0-80 9.3 9
0-90 11.4 11.2
0-100 13.9 13.8
0-110 18.4 17.6
0-120 22.2 21.6
Passing, 45-65 mph 2.6 2.7
Quarter mile 14.1 sec @ 100.6 mph 14.1 sec @ 101.0 mph
Braking, 60-0 mph 112 ft 109 ft
Top-gear revs @ 60 mph 2150 rpm 1900 rpm

Quote "Our quarter-mile time of 14.1 seconds was identical, and in fact the trap speed was up from 100.6 mph to 101.0. The 60-mph-dash was a tenth slower at 5.6 seconds, while times to the higher speeds were improved (21.6 seconds to 120 mph beats the twin-turbo featherweight by six-tenths). That's impressive, especially if the fuel economy ends up equal or better."

Read more: http://www.motortrend.com/roadtests/...#ixzz0xdbhkfkE
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      09-06-2010, 04:21 PM   #33
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Both engines are great, it doesn't make sense to fight over 0.1 seconds.

Hopefully N55 is better in reliability (Not proved so far)
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      09-06-2010, 06:48 PM   #34
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The n55 would seem to clearly have an advantage in power as indicated by the higher trap speed in the 1/4 mile and 1 sec advantage to 140. Remember this new f10'is almost 400 lbs heavier than the outgoing model and has inferior tires.
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      09-06-2010, 08:31 PM   #35
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Quote:
Originally Posted by Jimefam View Post
The n55 would seem to clearly have an advantage in power as indicated by the higher trap speed in the 1/4 mile and 1 sec advantage to 140. Remember this new f10'is almost 400 lbs heavier than the outgoing model and has inferior tires.
Run them at equal boost, then compare.
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      09-06-2010, 11:09 PM   #36
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Quote:
Originally Posted by tadtaggert View Post
Run them at equal boost, then compare.
That would be pointless. The idea is to compare them in stock trim, if you read my post I didn't say the n55 had more tuning potential or was running equal boost to produce the same power. I simply said its making more power and thats hard to argue against looking at the numbers. Dont know what the boost is set at for either one but yes if indeed the boost is lower on the n54 then thats probably why its making less power but it does seem to be making less power.

That would be if you were comparing apples to apples. The new 535i with the N55 benefits from a new, MUCH superior 8 speed transmission. That is why the performance numbers haven't changed much despite the extra 400 lbs on the '11 model, not because the new engine is far more powerful.

The C&D test drive on the new 3-series comparing the N54/N55 just a few posts above certainly wouldn't support the idea that the new N55 is so much more powerful on its own that it would propel a 400lb. heavier car to the same speeds as an N54... cuz 400 lbs is a lot, and the N55 doesn't have that kind of power advantage.


The new transmission is far superior I'll grant you that but most of the benefit would come at the lower speeds where its quicker shifting and shorter ratios come in handy but top end would help much and might just equal out cause of extra shifting or longer top gears(havent looked at the ratios so it might not be any different) Either way the trans alone wont make up the 400lbs difference.
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      09-11-2010, 08:57 AM   #37
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http://www.automobilemag.com/reviews...est/index.html

Automobile mag finally did some tests and comparison between the n54 and n55.

"And now to the N55: well, it doesn't, in fact, make as much power as the others N54s we've tested, but it does make slightly more torque. Peak numbers were 266 hp and 302 lb-ft. Before you start typing your "N55 sucks!" forum posts, let's remember that while the N55 put down 10 less horses than two of the N54s, a third N54 produced 10 more horsepower than the others. Meaning: 10 hp is within the noise when you're at this power level -- it's a variation of less than 4%. And you can easily see 4% variance between runs on the same engine."

"The end result? We can finally and directly compare an early N54, late N54, high-output N54, and an N55. The N55 exhibits less turbo lag in normal street driving, and even though its peak output was near the bottom of the group of engines we've tested, it's still well within its rated peak horsepower output -- and well above its rated peak torque output. Let the N54 vs N55 war continue!"

I guess some people's butt dynos aren't as great as they say.
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