F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > Turbo Output
Extreme Power House
Post Reply
 
Thread Tools Search this Thread
      12-13-2012, 05:51 PM   #1
MNBart
Private
1
Rep
72
Posts

 
Drives: F30 335ix Sport Line - Alpine
Join Date: Dec 2012
Location: Minneapolis

iTrader: (0)

Turbo Output

Anyone know what our turbo produces in lbs? I came from a GTI where the APR tune doubled the turbo's output but I am wondering what our BMW's produce stock. I haven't found anything on the topic using search so i apologize if it's out there

thanks!
Appreciate 0
      12-13-2012, 06:15 PM   #2
mikew2069
Major
mikew2069's Avatar
22
Rep
1,314
Posts

 
Drives: F30 335i MSport
Join Date: Oct 2012
Location: Houston

iTrader: (1)

Strange I haven't seen any threads on this either. What's the stock psi?
__________________
2013 F30 335i ///M-Sport
Forgestar/Challenge/BMS JB4
Wagner/Evo Race/M-Performance
Appreciate 0
      12-13-2012, 09:51 PM   #3
utenigma
Lieutenant
United_States
23
Rep
528
Posts

 
Drives: 2013 F30 335i 8SA M-Adaptive
Join Date: Oct 2012
Location: Dallas, Tx (Frisco)

iTrader: (0)

Garage List
Stock ECU on the N55 boost peaks at ~10psi
Appreciate 0
      12-14-2012, 11:36 AM   #4
mikew2069
Major
mikew2069's Avatar
22
Rep
1,314
Posts

 
Drives: F30 335i MSport
Join Date: Oct 2012
Location: Houston

iTrader: (1)

Wow that's pretty low. Lots of room to INCREASE!
__________________
2013 F30 335i ///M-Sport
Forgestar/Challenge/BMS JB4
Wagner/Evo Race/M-Performance
Appreciate 0
      12-14-2012, 03:49 PM   #5
rallybull
Captain
rallybull's Avatar
United_States
18
Rep
818
Posts

 
Drives: F30 335i w/PPK
Join Date: Jul 2012
Location: USA

iTrader: (0)

Not sure where I read it but it was something like 8.6 psi
Appreciate 0
      12-14-2012, 06:23 PM   #6
shivaswrath
Brigadier General
shivaswrath's Avatar
United_States
43
Rep
3,144
Posts

 
Drives: 2012 335i
Join Date: Apr 2008
Location: Lost in NJ

iTrader: (3)

Quote:
Originally Posted by mikew2069 View Post
Wow that's pretty low. Lots of room to INCREASE!
i don't think the stock block can handle insane amounts of more boost...12-14psi MAX, and that's probably meth.
__________________
2012 335i Mineral Gray
M Performance Whore: PPK|Exhaust|Brakes|Performance Suspension Struts & Springs|LSD|Black Kidney Grilles|CF Spoiler and Mirror Caps|Bav Stage 1|400Ms|BMWF30.com
Appreciate 0
      12-14-2012, 07:53 PM   #7
mikew2069
Major
mikew2069's Avatar
22
Rep
1,314
Posts

 
Drives: F30 335i MSport
Join Date: Oct 2012
Location: Houston

iTrader: (1)

Quote:
Originally Posted by shivaswrath View Post
i don't think the stock block can handle insane amounts of more boost...12-14psi MAX, and that's probably meth.
The new Kia Optima 2.0T runs 17.5psi stock....
__________________
2013 F30 335i ///M-Sport
Forgestar/Challenge/BMS JB4
Wagner/Evo Race/M-Performance
Appreciate 0
      12-14-2012, 08:50 PM   #8
buildbright
Captain
buildbright's Avatar
9
Rep
907
Posts

 
Drives: 335i BMW F30 Sedan
Join Date: Sep 2012
Location: Tampa, FL

iTrader: (0)

Quote:
Originally Posted by shivaswrath View Post
i don't think the stock block can handle insane amounts of more boost...12-14psi MAX, and that's probably meth.
Around 15 psi on pump gas no meth. with meth 16+
Appreciate 0
      12-14-2012, 11:08 PM   #9
shivaswrath
Brigadier General
shivaswrath's Avatar
United_States
43
Rep
3,144
Posts

 
Drives: 2012 335i
Join Date: Apr 2008
Location: Lost in NJ

iTrader: (3)

Quote:
Originally Posted by mikew2069 View Post
The new Kia Optima 2.0T runs 17.5psi stock....
this ain't a KIA, lol.
__________________
2012 335i Mineral Gray
M Performance Whore: PPK|Exhaust|Brakes|Performance Suspension Struts & Springs|LSD|Black Kidney Grilles|CF Spoiler and Mirror Caps|Bav Stage 1|400Ms|BMWF30.com
Appreciate 0
      12-15-2012, 08:11 AM   #10
mikew2069
Major
mikew2069's Avatar
22
Rep
1,314
Posts

 
Drives: F30 335i MSport
Join Date: Oct 2012
Location: Houston

iTrader: (1)

Exactly. I don't have much experience with turbos but why would the Kia 4 banger block be able to handle twice the boost as the Bimmer block?
__________________
2013 F30 335i ///M-Sport
Forgestar/Challenge/BMS JB4
Wagner/Evo Race/M-Performance
Appreciate 0
      12-15-2012, 09:50 AM   #11
utenigma
Lieutenant
United_States
23
Rep
528
Posts

 
Drives: 2013 F30 335i 8SA M-Adaptive
Join Date: Oct 2012
Location: Dallas, Tx (Frisco)

iTrader: (0)

Garage List
Quote:
Originally Posted by mikew2069 View Post
Exactly. I don't have much experience with turbos but why would the Kia 4 banger block be able to handle twice the boost as the Bimmer block?
Didnt research the kia, but off the top of my head they probably run less engine compression
Appreciate 0
      12-15-2012, 11:29 AM   #12
verbs
Lieutenant
10
Rep
539
Posts

 
Drives: 2013 335i M-Sport
Join Date: Aug 2010
Location: Phoenix, AZ

iTrader: (0)

Quote:
Originally Posted by mikew2069 View Post
I don't have much experience with turbos but
which is why you shouldn't jump to all kinds of assumptions that the 335i has tons of room to increase boost.
Appreciate 0
      12-15-2012, 11:57 AM   #13
mikew2069
Major
mikew2069's Avatar
22
Rep
1,314
Posts

 
Drives: F30 335i MSport
Join Date: Oct 2012
Location: Houston

iTrader: (1)

Quote:
Originally Posted by verbs View Post
which is why you shouldn't jump to all kinds of assumptions that the 335i has tons of room to increase boost.
I am having fun and talking about what could be. Get out of here hall monitor.
__________________
2013 F30 335i ///M-Sport
Forgestar/Challenge/BMS JB4
Wagner/Evo Race/M-Performance
Appreciate 0
      12-15-2012, 05:01 PM   #14
PeterM
Private First Class
3
Rep
174
Posts

 
Drives: bmw 335i
Join Date: Oct 2012
Location: United States

iTrader: (0)

Quote:
Originally Posted by shivaswrath View Post
i don't think the stock block can handle insane amounts of more boost...12-14psi MAX, and that's probably meth.
Boost will not matter that much its how much power it makes at that boost. Back to my 1.8T days i ran 24psi on stock turbo and 24psi on upgraded GT35R turbo the power difference is nigh and day and i ran the risk of blowing the motor. So are you saying increasing the boost by 4-5psi on a stock turbo N55 motor it will blow? Aren't the N54 guys pushing close to 500hp on stock engines.
__________________
2013 EB2 335i 6MT
Appreciate 0
      12-16-2012, 09:38 PM   #15
shivaswrath
Brigadier General
shivaswrath's Avatar
United_States
43
Rep
3,144
Posts

 
Drives: 2012 335i
Join Date: Apr 2008
Location: Lost in NJ

iTrader: (3)

I was taking into consideration the turbo sizes and strength of the block.

I ran 23psi peak boost on my 4G63 block, but had a nice taper. The solid, iron block on an Evo VIII with its strong stock internals could take it, and the twin scroll turbo was a champ.

The N55 twin scroll turbo is significantly smaller...
__________________
2012 335i Mineral Gray
M Performance Whore: PPK|Exhaust|Brakes|Performance Suspension Struts & Springs|LSD|Black Kidney Grilles|CF Spoiler and Mirror Caps|Bav Stage 1|400Ms|BMWF30.com
Appreciate 0
      12-17-2012, 02:21 AM   #16
RPM90
Major General
105
Rep
6,095
Posts

 
Drives: 335i Msport w/sport AT
Join Date: Mar 2006
Location: Chicago

iTrader: (1)

Quote:
Originally Posted by mikew2069 View Post
The new Kia Optima 2.0T runs 17.5psi stock....
BMW N20 18.9 psi.

Smaller displacement engines have to have very high stock boost pressure to achieve that type of power, as they have 33% less displacement compared to the N55's 3.0 liters.
The N55 can run lower boost pressure as it makes more displacement power.
1.0 liters more and 2 more pistons.

In simplest terms adding appx 15psi (normal atmosphere is 14.7 psi) of boost is like doubling the engines combustion chamber volume. For example, a 2.0 liter with 15psi of boost is like a 4.0 NA engine.
N20 2.0 at 19psi is like a let's call it 4.5.
N55 3.0 at 15psi is like a 6.0 NA.
But, the N55 has average boost a bit over 10psi, not quite double, 2/3's, or 2.0 liters more. 5.0 NA.

Even with a modest 5psi increase over stock, the N55 would then have 15psi of boost, doubling NA displacement to 6.0

The N20 would need 30psi total boost to make it like a 6.0 NA.
N55 with 30psi would be a 9.0!

That's why a larger displacement engine can run with less boost and create more power.
It also shows why the N20 is as powerful as it is compared to the N55.
This simple example shows a 4.5 vs 5.0 NA power.

This is just for fun, I'm not promoting this as exact as there are many variables.
The N54 is also a 3.0 running close to 9psi yet developed the same power as the N55.
But, that's a twin turbo vs a single twin scroll. It's one of those variables.

Last edited by RPM90; 12-17-2012 at 02:26 AM.
Appreciate 0
      12-23-2012, 01:25 PM   #17
RambleJ
Colonel
RambleJ's Avatar
No_Country
27
Rep
2,013
Posts

 
Drives: F10 535i M-sport
Join Date: Oct 2008
Location: Back in teh so cal

iTrader: (2)

Quote:
Originally Posted by mikew2069 View Post
Exactly. I don't have much experience with turbos but why would the Kia 4 banger block be able to handle twice the boost as the Bimmer block?
Please go off of that assumption and let us know at what psi your engine goes boom.

Unfortunately engines are made differently, so simple assumption like that doesn't hold any value.
Appreciate 0
      12-23-2012, 05:22 PM   #18
mikew2069
Major
mikew2069's Avatar
22
Rep
1,314
Posts

 
Drives: F30 335i MSport
Join Date: Oct 2012
Location: Houston

iTrader: (1)

Quote:
Originally Posted by RambleJ View Post
Please go off of that assumption and let us know at what psi your engine goes boom.

Unfortunately engines are made differently, so simple assumption like that doesn't hold any value.
Quote:
Originally Posted by mikew2069 View Post
I am having fun and talking about what could be. Get out of here hall monitor.
Once again, another hall monitor with a comment with absolutely ZERO value. See my comment about having fun talking about what 'could' be. Get out of here with YOUR assumptions that I actually want to just increase boost by 200% without accounting for other variables.
__________________
2013 F30 335i ///M-Sport
Forgestar/Challenge/BMS JB4
Wagner/Evo Race/M-Performance
Appreciate 0
      12-23-2012, 05:41 PM   #19
RambleJ
Colonel
RambleJ's Avatar
No_Country
27
Rep
2,013
Posts

 
Drives: F10 535i M-sport
Join Date: Oct 2008
Location: Back in teh so cal

iTrader: (2)

Quote:
Originally Posted by mikew2069 View Post
Once again, another hall monitor with a comment with absolutely ZERO value. See my comment about having fun talking about what 'could' be. Get out of here with YOUR assumptions that I actually want to just increase boost by 200% without accounting for other variables.
my assumptions... Who pissed in your cheerios this morning kiddo.
Yes its pure speculation on my end seeing that this is my 4th turbo charged BMW.
It may seem like we are raining on your parade, but just giving insight from EXPERIENCE.
The n54 engine was able to handle double the boost with higher octane and FBO, but the n55 is not the same unfortunately.
Appreciate 0
      12-23-2012, 05:45 PM   #20
RambleJ
Colonel
RambleJ's Avatar
No_Country
27
Rep
2,013
Posts

 
Drives: F10 535i M-sport
Join Date: Oct 2008
Location: Back in teh so cal

iTrader: (2)

Quote:
Originally Posted by PeterM View Post
Boost will not matter that much its how much power it makes at that boost. Back to my 1.8T days i ran 24psi on stock turbo and 24psi on upgraded GT35R turbo the power difference is nigh and day and i ran the risk of blowing the motor. So are you saying increasing the boost by 4-5psi on a stock turbo N55 motor it will blow? Aren't the N54 guys pushing close to 500hp on stock engines.
Unfortunately the differences between the n54 and the n55 are way more than just a different turbo set up and valvetronic. The n55 swapped out some internals to save some weight.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 07:55 PM.




f30post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST