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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > 2007 Engine Tech: How the N54 works (must read!!!)



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      03-15-2007, 04:47 PM   #23
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This forum is insanely helpful! I wish I lurked here earlier....been spending most my time on bimmerforums....

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      03-16-2007, 08:28 PM   #24
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Who was this stuff written for? It looks like it's basic study material for apprentice BMW mechanics. Does that mean they've covered the whole car in the same way i.e. transmission, suspension, electronics, idrive, interior trim etc?

Excellent find BTW
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      03-26-2007, 08:08 PM   #25
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Somebody did his Homework, and I would give you extra credit for it. Thanks
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      04-02-2007, 05:47 PM   #26
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I was taking a closer look at the turbos...they are designed so well from the factory it doesnt look like they have any excess material to port away...

I just wonder how a company is going to fit some kind of intake system in for the 335 lol.
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      04-14-2007, 06:58 PM   #27
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Quote:
Originally Posted by itsbrokeagain View Post
I was taking a closer look at the turbos...they are designed so well from the factory it doesnt look like they have any excess material to port away...

I just wonder how a company is going to fit some kind of intake system in for the 335 lol.
AFE wants to make a cold air intake but due to the design of the stock one I think it'll be very expensive. They will be coming out with an OEM replacement.

Dinan might come out with something but they might just modify the airbox. They did this for the E46 and E90 325/330 models.
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      04-14-2007, 07:03 PM   #28
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Quote:
Originally Posted by docbeemer View Post
Who was this stuff written for? It looks like it's basic study material for apprentice BMW mechanics. Does that mean they've covered the whole car in the same way i.e. transmission, suspension, electronics, idrive, interior trim etc?

Excellent find BTW
BMW writes it for BMW technicians or BMW STEP students that take the E90 course.

There are other sections in the E90, E92, and E93 Complete Vehicle manual.

There is not much info. on interior trim though unless it has some sort of special feature like front seats with adjustable side bolsters.
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      04-14-2007, 07:11 PM   #29
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Quote:
Originally Posted by Spazdoc View Post
Good info. One question I have is how is the current 335/N54 engine related to the 328 and older 330 engine? Is the 335 simple a tuned, turbocharged version of the others, or a completely new engine altogether?
A few things:

The N54 has a High Precision Injection (direct fuel injection) system. The N52 and N52KP does not have direction fuel injection.

The N54 has the same dimensions as the N52 block but the bolt pattern is different for the transmission. N54 uses a steel forged crank. N52 uses a cast iron version.

Valve covers are different due to the crankcase ventilation design.

N54 does not have valvetronic but the other next generation engines for 2007 retain them from the N52.

Last edited by jon@themshop; 04-15-2007 at 01:29 PM.
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      04-20-2007, 09:30 PM   #30
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Good stuff, at least there was some mention about the 328i.
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      07-03-2007, 04:33 PM   #31
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I found that part quite humorus considering Vishnu and AA already have products out that raise boost pressure... Cmon BMW, do you really think that you can give us a bi-turbo engine and expect us to keep it stock
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      07-03-2007, 05:00 PM   #32
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remmib,
My god your car is beautiful! Le Mans Blue has to be my alltime favorite color from BMW (I'm on my knees now praying for LMB being offered on the 135i). My guess is you did it through BMW Personal?
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      07-03-2007, 08:01 PM   #33
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I am trolling around on this site because I have a supercharged G35 coupe and have done just about everything I could to it, and just about have it payed off
naturally my eye was wandering, plus I am getting older and wanted something a little more mature and this car is at the top of my list

one of the things that does impress me over what everyone else stated is that this engine used an electric coolant pump and from what I have read a pretty beefy one

I think that would add little extra HP that was being robbed by most other cars that use a belt driven one

and of course the DI just inspires the imagination as to efficiency, (and Twin Turbo's)

I test drove one two weekends ago and that just made me even more convinced that next year I will be selling the coupe and getting one of these
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      07-18-2007, 01:57 AM   #34
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from what i have read jus breifly, the 335i is not bi-turbo its twin turbo ie both turbochargers are of indentical size!!


so for a turbo upgrade you would have to change both and will suffer a compromise for having more top end power but lag which with the smaller ones you dont?

is this the same for the diesel? i feel not? surely that is bi-turbo? one small and a larger one?


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      07-18-2007, 02:02 AM   #35
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so for a turbo upgrade you would have to change both and will suffer a compromise for having more top end power but lag which with the smaller ones you dont? Pretty much unless someone can build a new turbo manifold that can take a single turbo setup. Before doing that they have to figure out how they're going to get better high flow direct injectors for more power. Not cheap.

is this the same for the diesel? i feel not? surely that is bi-turbo? one small and a larger one? According to BMW and the tech specs, the 335d does indeed have 2 turbo.. one is small and the other one is larger
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      07-18-2007, 02:14 AM   #36
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thanks again for your reply!!

i knew the 335d had two turbos, i wasnt sure if it was bi or twin, bi-turbo by the sounds of it!!!

so the 335i has two identical turbos jon??

ie therefore twin turbo not bi-turbo
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      07-18-2007, 04:19 AM   #37
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geez, LOL, twin- and bi- mean the same - two turbos, regardless of their setup. Same synonyms like TDI, TD, TiD etc. - all mean turbo diesels.

If U wanna show the difference, say e.g. parralel vs. serial turbos, there's the difference. Parralel - 2 identical concurrent turbos (335i), serial - 1 small and 1 big turbo (335d), taking over each other in various engine operating modes and rpm's.
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      07-23-2007, 06:56 AM   #38
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yo ksfrogman, awesome info provided! But, I have a question....whats a n51 engine, how does it work and whats its spec? Is it a diesel by any chance?

tc bro.
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      07-23-2007, 07:25 AM   #39
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Quote:
Originally Posted by OBI_agent View Post
yo ksfrogman, awesome info provided! But, I have a question....whats a n51 engine, how does it work and whats its spec? Is it a diesel by any chance?

tc bro.
The Engine Introduction pdf just about has all the info that we know:

Quote:
In order to comply with SULEV requirements, the N51 is another variant of the N52
engine. There are various measures to meet the EPA/CARB standards, some of which
are familiar from the previous SULEV (M56) engine.
Some of the SULEV measures for the N51 include:
• Near engine catalyst with additional underbody catalyst
• Secondary air system
• Optimized combustion chamber geometry in cylinder head
• Modified piston crown for lower compression
• Plastic valve cover with integrated crankcase vent valve and separator (from N52KP)
• Stainless steel fuel lines with threaded connections
• Radiator with “Prem-air” coating
• Throttle system - EGAS08 carried over from N52KP
• Airbox with Activated carbon filter for EVAP control
• Purge system pipes are made from “optimized” plastic
It is a SULEV-II complaint engine and is not diesel. From what I understand, the N51 is the engine in 328s that are shipped to NY, CA, VT, MA, ME. Basically it adds an extra cat and makes some other changes to meet stricter emissions guidelines.
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      07-27-2007, 06:26 AM   #40
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Quote:
Originally Posted by elucas730 View Post
The Engine Introduction pdf just about has all the info that we know:



It is a SULEV-II complaint engine and is not diesel. From what I understand, the N51 is the engine in 328s that are shipped to NY, CA, VT, MA, ME. Basically it adds an extra cat and makes some other changes to meet stricter emissions guidelines.
Yo thanks for the info! Big help! Silly of me to think its a diesel......i concerntrated on the codes later! Anyway , I thought it was gonna be a third engine in the 3 series line up thats gonna be totally economical...and displace 2.5 litr i6. Anyway, thanks bro!
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      08-17-2007, 10:00 PM   #41
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Best post ever!
Thanks
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      09-09-2007, 02:33 PM   #42
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Quote:
Originally Posted by jon@themshop View Post
A few things:

The N54 has a High Precision Injection (direct fuel injection) system. The N52 and N52KP does not have direction fuel injection.

The N54 has the same dimensions as the N52 block but the bolt pattern is different for the transmission. N54 uses a steel forged crank. N52 uses a cast iron version.

Valve covers are different due to the crankcase ventilation design.

N54 does not have valvetronic but the other next generation engines for 2007 retain them from the N52.
And one very important thing: N54 engine block is made of all aluminium with iron cylinder liners compared to N52's aluminium/magnesium block.
Looks like BMW made a very reliable turbo engine.
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      09-20-2007, 12:29 AM   #43
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well can anyone tell me what turbos these actually are. ive heard kkk and even ihi. anyone?? size or model number would be great.
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      09-20-2007, 12:42 AM   #44
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Quote:
Originally Posted by ksfrogman View Post
continued...


good information.. i remembered this thread topic been posted like 3 time already.. please dont get mad at me..
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