N54 in the new 7 series

lyjw88 · 12-26-2008, 01:10 AM

It's been officially stated that the N54 engine used in the new 740i produces 325 hp and 45.9 kgm tq.
Does this mean that the N54 engined used in 335i is capable of producing more power with higher boost?
I know it is capable but does it prove that it is safe and reliable?

-=Hot|Ice=- · 12-26-2008, 01:55 AM

Quote:

Originally Posted by lyjw88

It's been officially stated that the N54 engine used in the new 740i produces 325 hp and 45.9 kgm tq.
Does this mean that the N54 engined used in 335i is capable of producing more power with higher boost?
I know it is capable but does it prove that it is safe and reliable?

It has already been proven that BMW under rates their engines. With that said, it's been proven numerous times over at e90post that the 335 does actually produce closer to 330 hp.

MVF4Rrider · 12-26-2008, 02:54 AM

http://www.rri.se/popup/performanceg...p?ChartsID=647

These guys are the most consistent and accurate source for true power output I'm aware of. According to them, the N54 produces exactly 282 HP.

ksfrogman · 12-26-2008, 03:03 AM

Quote:

Originally Posted by MVF4Rrider

http://www.rri.se/popup/performanceg...p?ChartsID=647

These guys are the most consistent and accurate source for true power output I'm aware of. According to them, the N54 produces exactly 282 HP.

Yeah, but that's wheel HP; not sure what the drive train loss is.

Deda · 12-26-2008, 12:20 PM

interesting info.

Jred22 · 12-26-2008, 12:23 PM

Quote:

Originally Posted by ksfrogman

Yeah, but that's wheel HP; not sure what the drive train loss is.

On most RWD cars it is around 20%. So they're saying the engine produces around 350 hp?

Year's_End · 12-26-2008, 01:26 PM

Quote:

Originally Posted by Jred22

On most RWD cars it is around 20%. So they're saying the engine produces around 350 hp?

282whp x 1.20 = 338.4bhp

Spaceman Spiff · 12-26-2008, 01:32 PM

Quote:

Originally Posted by Bimmer Loyalist

282whp x 1.20 = 338.4bhp

The correct math would be:

282 / 0.8 = 352.5

Year's_End · 12-26-2008, 01:43 PM

Quote:

Originally Posted by Spaceman Spiff

The correct math would be:

282 / 0.8 = 352.5

If that's the way to do it then that's cool, but could you explain why?

If there's a 20% loss, couldn't you just multiply 282 x .2, which equals 56.4, then add that to the original number of 282 and get 338.4?

I think I'm missing something.

Spaceman Spiff · 12-26-2008, 01:53 PM

Quote:

Originally Posted by Bimmer Loyalist

If that's the way to do it then that's cool, but could you explain why?

If there's a 20% loss, couldn't you just multiply 282 x .2, which equals 56.4, then add that to the original number of 282 and get 338.4?

I think I'm missing something.

That would be 20% of 282 but we're looking for an output that after 20% loss will equal 282. i.e.:

X - 0.2X = 282

0.8 X = 282

X = 282 / .8

chuck92103 · 12-26-2008, 04:23 PM

Quote:

Originally Posted by lyjw88

It's been officially stated that the N54 engine used in the new 740i produces 325 hp and 45.9 kgm tq.
Does this mean that the N54 engined used in 335i is capable of producing more power with higher boost?
I know it is capable but does it prove that it is safe and reliable?

The engine's max horsepower potential is the same for any car it is dropped into.

However, if the actual HP for a 335 is say 340HP and 20% less at the rear wheels (272 HP), that does not mean the same engine in the 7 series would yield the same results. In theory it should but it really depends on the software programming and the MPG BMW is trying to achieve along with the drive train components and gearing used.

retrodrive · 12-26-2008, 05:28 PM

The loss on BMW autos is 13-15%, not 20. The manual is 12%.

chrisE92 · 12-26-2008, 08:27 PM

Quote:

Originally Posted by Spaceman Spiff

That would be 20% of 282 but we're looking for an output that after 20% loss will equal 282. i.e.:

X - 0.2X = 282

0.8 X = 282

X = 282 / .8

+1 this is the correct way to do it. e90posters = mathematicians

Jred22 · 12-26-2008, 08:31 PM

Quote:

Originally Posted by Spaceman Spiff

That would be 20% of 282 but we're looking for an output that after 20% loss will equal 282. i.e.:

X - 0.2X = 282

0.8 X = 282

X = 282 / .8

ha, I knew how to do it but I didn't know how to explain it. thanks.

doba_s · 12-27-2008, 02:07 PM

it is so strange to see bmw going back ... from 740i to 745i and now back to 740i ? it seems like this engine is a bit small for such a big car ... i would like to see it with 4.4 TT like on X6 ...

lyjw88 · 12-27-2008, 05:20 PM

Quote:

Originally Posted by doba_s

it is so strange to see bmw going back ... from 740i to 745i and now back to 740i ? it seems like this engine is a bit small for such a big car ... i would like to see it with 4.4 TT like on X6 ...

yup 750i comes with 4.4 TT as I remember

chuck92103 · 12-27-2008, 06:16 PM

Quote:

Originally Posted by doba_s

it is so strange to see bmw going back ... from 740i to 745i and now back to 740i ? it seems like this engine is a bit small for such a big car ... i would like to see it with 4.4 TT like on X6 ...

I agree. It would be nice to see the 318d make its way over here. 50MPG would be nice.

I think the V8/12's are going away. More turbos will be used in 4 and 6 cyl engines.

Year's_End · 12-28-2008, 01:24 AM

Quote:

Originally Posted by Spaceman Spiff

That would be 20% of 282 but we're looking for an output that after 20% loss will equal 282. i.e.:

X - 0.2X = 282

0.8 X = 282

X = 282 / .8

lol thanks man.

Cloud9blue · 12-28-2008, 03:38 AM

Quote:

Originally Posted by Bimmer Loyalist

lol thanks man.

lol, looks like your middleschool algebra teacher didn't do a good job

Spaceman Spiff · 12-28-2008, 12:58 PM

Quote:

Originally Posted by Bimmer Loyalist

lol thanks man.

Any time

Regardless of the math, 350hp sounds a little too high!

Year's_End · 12-28-2008, 01:07 PM

Quote:

Originally Posted by AlpineCloud9

lol, looks like your middleschool algebra teacher didn't do a good job

haha i just got a little mixed up.

12-26-2008, 01:10 AM	#1
lyjw88 Major 221 Rep 1,414 Posts Drives: C63S & X3MC Join Date: Dec 2006 Location: Boston iTrader: (6)	N54 in the new 7 series It's been officially stated that the N54 engine used in the new 740i produces 325 hp and 45.9 kgm tq. Does this mean that the N54 engined used in 335i is capable of producing more power with higher boost? I know it is capable but does it prove that it is safe and reliable?
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12-26-2008, 02:54 AM	#3
MVF4Rrider PCA, BMWCCA 102 Rep 2,058 Posts Drives: 997S, MV Agusta F4, E46 M3 Join Date: Apr 2008 Location: Las Vegas NV iTrader: (0)	http://www.rri.se/popup/performanceg...p?ChartsID=647 These guys are the most consistent and accurate source for true power output I'm aware of. According to them, the N54 produces exactly 282 HP. __________________ '08 Carrera S 6MT Guards Red/Black ext leather, Carbon fiber pkg, sport exh, sport chrono +, PASM, Nav, Bose, 19" forged turbos, red tranny tunnel '07 MV Agusta F4 1000 R 1+1, Corse Red/Silver, RG3 race pipes and factory race ECU
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12-26-2008, 12:20 PM	#5
Deda Major General 563 Rep 7,034 Posts Drives: BMW M5 comp Join Date: Apr 2008 Location: Croatia iTrader: (0)	interesting info.
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12-26-2008, 05:28 PM	#12
retrodrive Lieutenant Colonel 150 Rep 1,938 Posts Drives: 335i Join Date: Jan 2007 Location: Irvine, CA iTrader: (8)	The loss on BMW autos is 13-15%, not 20. The manual is 12%.
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12-27-2008, 02:07 PM	#15
doba_s Major General 405 Rep 6,107 Posts Drives: X7 l Cayenne l 997.2RS Join Date: Sep 2006 Location: Danville iTrader: (26)	it is so strange to see bmw going back ... from 740i to 745i and now back to 740i ? it seems like this engine is a bit small for such a big car ... i would like to see it with 4.4 TT like on X6 ...
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