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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > RB Turbo's N55 Turbo Upgrade, rounding the bases



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      08-06-2013, 12:54 PM   #23
Dozhdbog
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Regarding forged internals (just one thread of many):
http://www.e90post.com/forums/showth...=589025&page=2
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      08-06-2013, 01:34 PM   #24
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Quote:
Originally Posted by 3000GT MR View Post
Looks awesome Rob. Great work as always!! You N55 guys are in great hands. This is about to get real interesting with this motor.
I agree. All aspects of the flange will be finished today. I have the weld els pipes due in later this week. After that we are going to making a very cool collector allowing a modular fitment concept. Should be smooth sailing from there. Most of the custom fittings should be done in the next day or two as well.

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Originally Posted by CPWINCH View Post
I am ready to move quickly. Have jb4, intercooler, and ordering downpipes this week. Dont think there are many full bolt on f30 n55s who live ten minutes away from terry from bms. Let me know what we can do
Cool. Keep on board this thread. I'm always glad to hear of those who are willing to blaze this trail alongside us, but for now lets just hang back and be ready for the callout when the time comes. Just saying this to avoid PMs, phone calls, emails, etc. about those who are interested as I'd rather just gather the info about the candidates when the time comes. Does sound like you'd be a good candidate though, so definitely stay on board... and thanks again for volunteering to help this out.

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Originally Posted by turugara View Post
Tuning is going to be key for this. I can't wait to see all the different options for the n55! If the bottom end can handle it, the N55 has better head, cams, and valves than the n54!
I'd like to see BMS aid in tackling this setup and proving it out. They tend to move very fast, plus we've had a lot of customers in the past who have worked with them to kick out excellent numbers very consistently. All of the other tuners are great as well, but time will be of the essence and I'm confident they will be the most flexible in getting numbers the quickest.

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Originally Posted by FOACAD View Post
Limits will definitely be pushed.

I have to think that this engine cant take much more than the 550 kit without being built on the inside.

Any guess on which end will pop first, bottom or top?
I kind of agree with you. After 550hp is where I have a feeling things may get sketchy. Cast crank and cast rods are not a great combo.

Quote:
Originally Posted by 3000GT MR View Post
Its one of those things though. Did anyone expect the n54 to make 740 on a engine that has been beat with 680-700hp for thousands of miles? Sure it's forged but a lot has to do with materials and design. I bet the N55 will handle more than expected. I hope like the N54 other limitations are found before it grenades.

Haven't really looked at specs but who knows a n54 bottom end swap could be possible. 09-present have 6 bolt FW. Might be a cheap option. I wish the best for the N55 and to that badass turbo Rob brought to the forefront.
On the flip side I have a hard time believing BMW would lay down and build such a flimsy engine after the almighty N54. Time will have to tell.

Quote:
Originally Posted by Dozhdbog View Post
What kind of power delay will there be with this turbo? I imagine there has to be some increase over stock.
Being that the original turbo is also twin scroll (and tiny in comparison), there will definitely be delays in spool. BUT, this unit is Ball bearing and also has an ultra light Ti Turbine wheel. This is going to make up for ALOT of lost ground over the original turbine and journal bearing turbo. As I said earlier, little twins do not matter much in the technology department... but when running a bigger single there is a lot of technology that is worth utilizing (and this unit has it all). On the 550hp kit I really expect a nearly the same spool, or close enough that there will be no real concern overall. It will be interesting to see.

Quote:
Originally Posted by Dozhdbog View Post
The n54 does not have forged internals. This was beaten to death over and over again in this very forum.
The word is the N55 is all Cast, correct. The short block may hit a power limit pretty quickly (in contrast to the N54).
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      08-06-2013, 03:56 PM   #25
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Where is your location in StL?
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      08-06-2013, 04:14 PM   #26
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St. Charles County. Actually a suburb of STL.

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Where is your location in StL?
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      08-06-2013, 04:23 PM   #27
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Originally Posted by Rob@RBTurbo View Post
St. Charles County. Actually a suburb of STL.
Not too far. I'll have to check you guys out.
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      08-06-2013, 04:29 PM   #28
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Almost done with some custom fittings
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      08-06-2013, 05:39 PM   #29
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Ooooh, shiny!! I like!
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      08-06-2013, 06:05 PM   #30
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Verrry interested to see the reliability of this.
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      08-06-2013, 06:22 PM   #31
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Quote:
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Verrry interested to see the reliability of this.
Borg Warner has a pretty outstanding reputation. They actually make the OEM turbo for the N55, just a much less capable unit but still reliable.
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      08-06-2013, 06:51 PM   #32
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This is looking extremely exciting. Could be a whole new world opening up for us N55 owners soon.
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      08-06-2013, 08:51 PM   #33
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Quote:
Originally Posted by Rob@RBTurbo View Post
Borg Warner has a pretty outstanding reputation. They actually make the OEM turbo for the N55, just a much less capable unit but still reliable.
I'm sure the turbo, as a piece of equipment, is solid. What I meant by "reliability" was how the whole platform responds to this kind of modification. Interested to see if the engines hold up, how the transmissions fare, etc. Without a doubt if you offer levels up to 750bhp, we will soon be finding out what the weak links are. My car has already had the HPFP replaced once and is going in soon to have it done again. I'm not confident that the stock fueling can handle this.
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      08-06-2013, 09:01 PM   #34
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Fortunately there are a lot of pioneers ready to confirm/deny reliability for you!
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      08-06-2013, 09:57 PM   #35
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I still have warranty for two more years. Someone else is going to have to blaze this trail.
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      08-06-2013, 10:39 PM   #36
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Turbo upgrade is all I have left to do other than the FMIC. Thanks Rob for doing this for the N55. N55ers need a reason to be excited lol.
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      08-07-2013, 01:30 AM   #37
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Quote:
Originally Posted by Rob@RBTurbo View Post
I kind of agree with you. After 550hp is where I have a feeling things may get sketchy. Cast crank and cast rods are not a great combo.
As pointed out on another forum im on, citing the training manual. They feel this could help out with the shortcomings of cast crack and rods.


Quote:
The crankshaft of the N55 is of lightweight design, at 20.3 kg itís approximately 3 kg
lighter than the crankshaft in the N54 engine.
The crankshaft is made from cast iron (GGG70). The counterweights are arranged asymmetrically.
There is no incremental wheel installed on the crankshaft. The timing chains
are mounted by means of an M18 central bolt.


The size of the connecting rod of the N55 engine is 144.35 mm. A new feature is the
specially formed hole in the small end of the connecting rod. This formed hole is
machined wider on the lower edges of the wrist pin bushing/bore. This design evenly
distributes the force acting on the wrist pin over the entire surface of the rod bushing and
reduces the load at the edges, as the piston is forced downward on the power stroke.
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      08-07-2013, 09:09 AM   #38
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Quote:
Originally Posted by FOACAD View Post
As pointed out on another forum im on, citing the training manual. They feel this could help out with the shortcomings of cast crack and rods.
I agree. One would think the Germans wouldn't let the engineering slip up too much. Perhaps it will be more resilient to the HP stresses than it is being given credit for... but ultimately there's only 1 way to find out

I do think the 550hp kit should be a walk in the park for it. The 650hp kit may just skate by. I'd be pretty blown away if the 750hp kit is able to not push the short block overboard at max capability. All just my own guesses, no data to back it up obviously.

Rob
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      08-07-2013, 11:14 AM   #39
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Cool..

Mike
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      08-07-2013, 11:29 AM   #40
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Hey,

This sounds like a fantastic option, I'm interested in buying/testing this kit for you! Whatever you need i'd be willing to bolt it up right away and get some data/dyno figures for you.

Car:
2011 335i X Drive
JB4
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Vishnu catted downpipes
ETS intercooler
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Walbro E85 Fuel pump upgrade

Please keep me informed Thanks

Brett
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      08-07-2013, 01:38 PM   #41
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Quote:
Originally Posted by NeoNz View Post
Hey,

This sounds like a fantastic option, I'm interested in buying/testing this kit for you! Whatever you need i'd be willing to bolt it up right away and get some data/dyno figures for you.

Car:
2011 335i X Drive
JB4
E85 50/50 mix
BMS Intake
Vishnu catted downpipes
ETS intercooler
CPE Chargepipe
Walbro E85 Fuel pump upgrade

Please keep me informed Thanks

Brett
Just stay tuned. As said prior will cross the bridge of who is going to test when we get there. Very busy over here, so excess emails/pms/calls about testing is something I want to try to avoid in this interim. Those who subscribe to this thread will be well aware when the time comes as I will make the update here, and at that time we shall be ready to work out the details.

Thanks,
Rob
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      08-07-2013, 02:21 PM   #42
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Best of luck with the rest of development and testing. Thanks for putting your time and efforts into the N55 engine.
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      08-07-2013, 03:21 PM   #43
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      08-07-2013, 07:25 PM   #44
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Best of luck with the rest of development and testing. Thanks for putting your time and efforts into the N55 engine.
Thanks sir! We all need all the luck we can get!
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