Mods for N55

Juiced46 · 08-24-2010, 08:59 PM

I think its an XI thing, but why? It makes no sense to have them on the XI and not on non Xdrive cars.

I looked at another 2011 M sport 335 Xdrive today, and it had the same cats/resonators as mine did.

Unfortunately cutting up the stock exhaust is not an option for me.

michaelthepsycho · 08-24-2010, 09:13 PM

Maybe the fuel map on xi's are different. Because the engine needs to power all four wheels, it runs slightly rich? I don't know... Just a very wild guess.

D.B.S · 08-24-2010, 10:37 PM

to bad we can't xray the cats/resonator... LOL... anyone got access to some xray tech?

D.B.S · 08-25-2010, 09:40 AM

Question, does anyone know the part number off the stock FMIC on your E9X? I'm trying to compare the part number with my E70 stock FMIC... If they are the same, then Helix will be able to develop an FMIC for both the 335 and the X5...

itsbrokeagain · 08-26-2010, 10:41 PM

I think it is an xi thing as well. One of my customers has an E92 xi 6MT. Cats in the midsection like the N54.

The funny part is the down pipe picture you posted with the 02 sensor in the middle, on the xi it's at the very back. One on top behind the turbo and one at the bottom.

I guess internally they are different. I want to see an I model N55 for comparison.

I have some nice pics to upload in a little bit

itsbrokeagain · 08-26-2010, 10:43 PM

The other thing I'm noticing is no diverter valves. None at all, anywhere. I wonder if that's why the car takes forever to wind down after you rev it up. Bmw closes the throttle body slowly to avoid compressor surge I guess...

D.B.S · 08-26-2010, 11:01 PM

Quote:

Originally Posted by Matt@Camber-Toe

The other thing I'm noticing is no diverter valves. None at all, anywhere. I wonder if that's why the car takes forever to wind down after you rev it up. Bmw closes the throttle body slowly to avoid compressor surge I guess...

Quoted from the N55 Manual (thanks to Dave for supplying it)

Diverter valve
The basic function of the diverter valve remains the same. The difference compared to the N54 engine is that the diverter valve is not operated pneumatically. The diverter valve on the N55 engine is an electric actuator that is controlled directly by the DME. The number of components has been greatly reduced by positioning the diverter valve on the turbocharger compressor housing.

itsbrokeagain · 08-27-2010, 12:33 AM

Quote:

Originally Posted by Army335xi

Quoted from the N55 Manual (thanks to Dave for supplying it)

Diverter valve
The basic function of the diverter valve remains the same. The difference compared to the N54 engine is that the diverter valve is not operated pneumatically. The diverter valve on the N55 engine is an electric actuator that is controlled directly by the DME. The number of components has been greatly reduced by positioning the diverter valve on the turbocharger compressor housing.

ah ha!!

So its in that jumbled mess down by the t-stat/waterpump/turbo inlet pipe jungle...

wasnt this done on the SRT-4 neon? I recall seeing it somewhere that the diverter was built into the compressor housing on some kinda import car..

itsbrokeagain · 08-27-2010, 01:19 AM

pictures are up

D.B.S · 08-27-2010, 06:22 AM

Quote:

Originally Posted by Matt@Camber-Toe

pictures are up

Geez, do you ever sleep? Pics look good... A worthy addition to our in depth study of the N55...

bavarianx · 08-27-2010, 03:20 PM

Quote:

Originally Posted by FrankiE90

Hey great thread, lets use it to list all performance mods for the N55.
we can get someone to update the sticky.

Juiced46 confirmed fitment for the AMS exhaust.
I'm sure other exhaust for the N54 will fit the N55- just need confirmation.
as soon as someone test fit one we'll update this thread.

I'll be testing out the Vanguard system, hopefully this week.

----------------------------------------------------
UPDATED 08-27-2010
***N55 MOD LIST

TUNE:
BMS - JB (stage 1) in progress (beta testing)
Vishnu - in development
GIAC - in development

EXHAUST:
AMS Exhaust (confirmed fitment Juiced46)
BMW Performance Exhaust (* sound clip LINK)
Remus RACE quad exhaust (madmanhiker has on order)
Muffler Delete (shockin330i tested)
Vanguard Exhaust (confirmed fitment Frankie90) (Sound Clip)

INTAKE:
HP Autowerkes Foam Filter drop in (INFO LINK)
AFE Filter drop in (INFO LINK)
RSD (Racing Sport Design) Intake (in development)
CP-E Exhaust (Alpine335TT will be test'n)

FMIC:
none

DOWNPIPE:
AR Design willing to fabricate // any N55 takers

NOTE:

CP-E looking for local N55 to Beltsville, MD.
pm "huyner328"

Blowup pics of N55 Downpipe /Turbo -
Courtsey of Matt@Camber-toe
LINK

-----------------------------------------------------------

RSD has a prototype DP already for N55 as well and it has now been confirmed the RSD (EVC) Exhaust fits the new cars!

FrankiE90 · 08-27-2010, 03:29 PM

Quote:

Originally Posted by bavarianx

RSD has a prototype DP already for N55 as well and it has now been confirmed the RSD (EVC) Exhaust fits the new cars!

we've seen pics of the RSD EVC Exhaust.
do you have picts of the DP? and is it on an N55 now?

info updated again.

bavarianx · 08-27-2010, 03:32 PM

no pics of the model, as they are building the jig for it now. I'll post some as soon as i can get them.

shockin330i · 08-28-2010, 12:56 AM

sweet, I better start saving up.

ian2002525 · 09-02-2010, 03:03 PM

The Eissenmann exhaust is also fit for N55! i am on ordering now ^^

Doug007 · 09-02-2010, 03:23 PM

Quote:

Originally Posted by Matt@Camber-Toe

The other thing I'm noticing is no diverter valves. None at all, anywhere. I wonder if that's why the car takes forever to wind down after you rev it up. Bmw closes the throttle body slowly to avoid compressor surge I guess...

Somebody correct me if I'm wrong, but I thought valvetronic engines did not have a throttle body.

I thought power was controlled exclusively by variable valve lift completely eliminating the throttle butterfly, and therefore much of the efficiency loss due to pressure drop across the throttle.

EDIT:

From BMW's website: http://www.bmw.com/com/en/insights/t...lvetronic.html

"The throttle butterfly is no longer needed as a means of controlling the air supply - though for safety reasons it is still fitted as an emergency back-up."

BRAISKI · 09-02-2010, 04:59 PM

Anyone know if Dinan something for the N55?

shockin330i · 09-03-2010, 01:59 AM

Not sure. You should email them!

BRAISKI · 09-03-2010, 06:48 AM

Will the BMS Dual Cone Intake work with the N55?

RyanMv4 · 09-03-2010, 07:23 AM

Quote:

Originally Posted by BRAISKI

Will the BMS Dual Cone Intake work with the N55?

Nope totally different intake setup

BRAISKI · 09-03-2010, 07:42 AM

Quote:

Originally Posted by RyanMv4

Nope totally different intake setup

Thanks! Good to know, someone was selling one for the N54.

marconi118 · 09-03-2010, 08:27 AM

Quote:

Originally Posted by Doug007

Somebody correct me if I'm wrong, but I thought valvetronic engines did not have a throttle body.

I thought power was controlled exclusively by variable valve lift completely eliminating the throttle butterfly, and therefore much of the efficiency loss due to pressure drop across the throttle.

EDIT:

From BMW's website: http://www.bmw.com/com/en/insights/t...lvetronic.html

"The throttle butterfly is no longer needed as a means of controlling the air supply - though for safety reasons it is still fitted as an emergency back-up."

throttle is still there for security reason if valvetronik stucks in VOT mode

08-24-2010, 08:59 PM	#111
Juiced46 Major 74 Rep 1,035 Posts Drives: 03 Turbo Cobra, 2011 335xi Join Date: Jun 2010 Location: Wallingford CT iTrader: (3)	I think its an XI thing, but why? It makes no sense to have them on the XI and not on non Xdrive cars. I looked at another 2011 M sport 335 Xdrive today, and it had the same cats/resonators as mine did. Unfortunately cutting up the stock exhaust is not an option for me.
	Appreciate 0 Quote

08-24-2010, 09:13 PM	#112
michaelthepsycho Lieutenant Colonel 76 Rep 1,644 Posts Drives: 11 Montego Blue E90 335i Step Join Date: May 2009 Location: CA iTrader: (4)	Maybe the fuel map on xi's are different. Because the engine needs to power all four wheels, it runs slightly rich? I don't know... Just a very wild guess. __________________ Former car 2011 BMW 335i Step - Montego Blue / Chestnut Brown
	Appreciate 0 Quote

08-24-2010, 10:37 PM	#113
D.B.S Lieutenant Colonel 30 Rep 1,748 Posts Drives: '11 X5 35i / '13 S5 Join Date: Jun 2009 Location: Deployed to Kuwait iTrader: (2)	to bad we can't xray the cats/resonator... LOL... anyone got access to some xray tech? __________________ BMW X5 35i: Boopie Exhaust & Intercooler, K&N Drop in Filter, JB3 (3+ psi) 2013 Dodge Challenger R/T: CAI, Catch Can, Custom Exhaust, Headers, 87MM Throttle Body, Diablo Custom 93 OCT Tune
	Appreciate 0 Quote

08-25-2010, 09:40 AM	#114
D.B.S Lieutenant Colonel 30 Rep 1,748 Posts Drives: '11 X5 35i / '13 S5 Join Date: Jun 2009 Location: Deployed to Kuwait iTrader: (2)	Question, does anyone know the part number off the stock FMIC on your E9X? I'm trying to compare the part number with my E70 stock FMIC... If they are the same, then Helix will be able to develop an FMIC for both the 335 and the X5... __________________ BMW X5 35i: Boopie Exhaust & Intercooler, K&N Drop in Filter, JB3 (3+ psi) 2013 Dodge Challenger R/T: CAI, Catch Can, Custom Exhaust, Headers, 87MM Throttle Body, Diablo Custom 93 OCT Tune
	Appreciate 0 Quote

08-26-2010, 10:41 PM	#115
itsbrokeagain 310 Rep 15,745 Posts Drives: 1999 528iT, E53 X5, E46 325xi Join Date: Mar 2007 Location: Strong Island iTrader: (7)	I think it is an xi thing as well. One of my customers has an E92 xi 6MT. Cats in the midsection like the N54. The funny part is the down pipe picture you posted with the 02 sensor in the middle, on the xi it's at the very back. One on top behind the turbo and one at the bottom. I guess internally they are different. I want to see an I model N55 for comparison. I have some nice pics to upload in a little bit
	Appreciate 0 Quote

08-26-2010, 10:43 PM	#116
itsbrokeagain 310 Rep 15,745 Posts Drives: 1999 528iT, E53 X5, E46 325xi Join Date: Mar 2007 Location: Strong Island iTrader: (7)	The other thing I'm noticing is no diverter valves. None at all, anywhere. I wonder if that's why the car takes forever to wind down after you rev it up. Bmw closes the throttle body slowly to avoid compressor surge I guess...
	Appreciate 0 Quote

08-27-2010, 01:19 AM	#119
itsbrokeagain 310 Rep 15,745 Posts Drives: 1999 528iT, E53 X5, E46 325xi Join Date: Mar 2007 Location: Strong Island iTrader: (7)	pictures are up
	Appreciate 0 Quote

08-27-2010, 03:32 PM	#123
bavarianx Colonel 224 Rep 2,103 Posts Drives: 2006 X5 4.4i Join Date: Dec 2006 Location: Orange County, CA iTrader: (18)	no pics of the model, as they are building the jig for it now. I'll post some as soon as i can get them.
	Appreciate 0 Quote

08-28-2010, 12:56 AM	#124
shockin330i Brigadier General 798 Rep 4,784 Posts Drives: 2016 ZCP M3 Join Date: Jan 2007 Location: f y'all, I'm from Texas (RGV) iTrader: (1)	sweet, I better start saving up. __________________ ERnie 2016 BSM/f80/ZCP
	Appreciate 0 Quote

09-02-2010, 03:03 PM	#125
ian2002525 台灣台北市 88 Rep 1,267 Posts Drives: 2009 GT-R Premium Join Date: Jun 2010 Location: Brentwood, TN/台灣 iTrader: (6) Garage List 2011 335i coupe [9.00]	The Eissenmann exhaust is also fit for N55! i am on ordering now ^^
	Appreciate 0 Quote

09-02-2010, 04:59 PM	#127
BRAISKI Colonel 135 Rep 2,517 Posts Drives: '11 335xi e92 M-Pak Join Date: Mar 2009 Location: GTA/KW, Canada iTrader: (3) Garage List 2011 BMW 335xi [7.00]	Anyone know if Dinan something for the N55?
	Appreciate 0 Quote

09-03-2010, 01:59 AM	#128
shockin330i Brigadier General 798 Rep 4,784 Posts Drives: 2016 ZCP M3 Join Date: Jan 2007 Location: f y'all, I'm from Texas (RGV) iTrader: (1)	Not sure. You should email them! __________________ ERnie 2016 BSM/f80/ZCP
	Appreciate 0 Quote

09-03-2010, 06:48 AM	#129
BRAISKI Colonel 135 Rep 2,517 Posts Drives: '11 335xi e92 M-Pak Join Date: Mar 2009 Location: GTA/KW, Canada iTrader: (3) Garage List 2011 BMW 335xi [7.00]	Will the BMS Dual Cone Intake work with the N55?
	Appreciate 0 Quote