E90Post
 


MINHS Auto Care Center
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Could someone kindly explain how boost works



Reply
 
Thread Tools Search this Thread
      04-07-2013, 01:47 PM   #1
Dark_Knight_335
Came to the N55 Darkside
 
Dark_Knight_335's Avatar
 
Drives: 2011 335 E93 M-Sport
Join Date: May 2010
Location: NY/NJ

Posts: 9,680
iTrader: (26)

Could someone kindly explain how boost works

I ran some runs today with the PIII gauge and my boost ranged from 11.5 to 13, and at one point I actually hit 13.8.
I assume that's a good thing, but how exactly does this work?
I assume it's how the turbo spools etc.
Dark_Knight_335 is offline   United_States
0
Reply With Quote
      04-07-2013, 03:57 PM   #2
Beemw335
Colonel
 
Drives: 335i
Join Date: Mar 2011
Location: My car is my home

Posts: 2,015
iTrader: (2)

Not sure what youre asking...
What is boost? or why does it vary?
Beemw335 is offline  
0
Reply With Quote
      04-07-2013, 05:02 PM   #3
Dark_Knight_335
Came to the N55 Darkside
 
Dark_Knight_335's Avatar
 
Drives: 2011 335 E93 M-Sport
Join Date: May 2010
Location: NY/NJ

Posts: 9,680
iTrader: (26)

Thanks Beem! More why it varies.
Dark_Knight_335 is offline   United_States
0
Reply With Quote
      04-07-2013, 05:05 PM   #4
#Tee
Chronic trollololer level 60
 
#Tee's Avatar
 
Drives: yes
Join Date: Oct 2011
Location: Socal

Posts: 4,682
iTrader: (0)

could be a number of things, a/f ratios, air intake temps, what gear youre in, open/closed loop operations and or knock detection. At times pending on the air intake charge(on cold nights) you can see a couple psi changes, more dense charge better combustion more power. this is common with a IC upgrade.
__________________

#TeamStretchNpoke IG:Tee212
custom cf rear side diffuser add ons for sale (e9x,M3s,f3x) pm me for details. thread http://www.e90post.com/forums/showthread.php?t=962442
#Tee is online now  
0
Reply With Quote
      04-07-2013, 05:53 PM   #5
Dark_Knight_335
Came to the N55 Darkside
 
Dark_Knight_335's Avatar
 
Drives: 2011 335 E93 M-Sport
Join Date: May 2010
Location: NY/NJ

Posts: 9,680
iTrader: (26)

Ahhh that explains it! I upgraded to a Dinan inter-cooler and oil cooler along with my stage III.
You guys are sharp!
Dark_Knight_335 is offline   United_States
0
Reply With Quote
      04-07-2013, 07:21 PM   #6
madmanhiker
Lieutenant Colonel
 
madmanhiker's Avatar
 
Drives: '11 E92 335i
Join Date: Jul 2008
Location: Jacksonville, Fl

Posts: 1,549
iTrader: (3)

Garage List
Quote:
Originally Posted by Dark_Knight_335 View Post
I ran some runs today with the PIII gauge and my boost ranged from 11.5 to 13, and at one point I actually hit 13.8.
I assume that's a good thing, but how exactly does this work?
I assume it's how the turbo spools etc.
The "accuracy" of a PIII gauge entirely is dependent on the types of performance modifications are currently in your vehicle. Do you have a tune which interacts with the CAN BUS or ECU? If so, the PIII gauge readout is irrelevant.

So... do you have a piggy-back boost controller tune such as PROcede or JB4?

YES or NO

If YES, the CAN output reading will be skewed from the tune and the ECU software - which leads to an irrelevant reading on the PIII gauge

If NO, then the PIII gauge (plugged into your OBDII port) "should" read fairly accurate. The stock boost for a 335 n55 motor is between 8-11 psi. With minor mechanical modifications you can increase your boost output to as high as 13 psi +/-1 from what I have seen.

hope this helps...
__________________
-madmanhiker jax,fl
madmanhiker is offline   United_States
0
Reply With Quote
      04-07-2013, 08:25 PM   #7
Dark_Knight_335
Came to the N55 Darkside
 
Dark_Knight_335's Avatar
 
Drives: 2011 335 E93 M-Sport
Join Date: May 2010
Location: NY/NJ

Posts: 9,680
iTrader: (26)

Quote:
Originally Posted by madmanhiker
Quote:
Originally Posted by Dark_Knight_335 View Post
I ran some runs today with the PIII gauge and my boost ranged from 11.5 to 13, and at one point I actually hit 13.8.
I assume that's a good thing, but how exactly does this work?
I assume it's how the turbo spools etc.
The "accuracy" of a PIII gauge entirely is dependent on the types of performance modifications are currently in your vehicle. Do you have a tune which interacts with the CAN BUS or ECU? If so, the PIII gauge readout is irrelevant.

So... do you have a piggy-back boost controller tune such as PROcede or JB4?

YES or NO

If YES, the CAN output reading will be skewed from the tune and the ECU software - which leads to an irrelevant reading on the PIII gauge

If NO, then the PIII gauge (plugged into your OBDII port) "should" read fairly accurate. The stock boost for a 335 n55 motor is between 8-11 psi. With minor mechanical modifications you can increase your boost output to as high as 13 psi +/-1 from what I have seen.

hope this helps...
It does Mad- thanks so much! No piggyback - Dinan stage III with inter-cooler and oil cooler.
I was thrilled to find the config was so deceptively simple (as mentioned in my other thread.)
Pretty impressed hitting 13.8 at one point
Dark_Knight_335 is offline   United_States
0
Reply With Quote
      04-11-2013, 02:40 PM   #8
WildBee659
Newbee
 
WildBee659's Avatar
 
Drives: 2011 335i E93, Black Sapphire
Join Date: Dec 2011
Location: Florida

Posts: 117
iTrader: (0)

Nice info to know. We have the same E93's but different tune. I just have a PPK and PE, and happy with it. With a Dinan tune my rear tires wouldn't last long.LOL

Maybe after the warranty expires in 6yrs/100k miles. I used to trade my cars more often, but now I keep them longer and save some $$$$. My 07 "SuperBee" has 105k+ and still going strong. My E93 is awesome, IMHO, and having a convertible in FL is
__________________

2007 Dodge Charger SRT8 "SuperBee"
2012 Dodge Charger SRT8 (Wife's Car)
2011 BMW 335i/E93: M-Sport, PPK1, BMW PE, Black Kidney Grills
WildBee659 is offline   United_States
0
Reply With Quote
      04-11-2013, 06:01 PM   #9
Dark_Knight_335
Came to the N55 Darkside
 
Dark_Knight_335's Avatar
 
Drives: 2011 335 E93 M-Sport
Join Date: May 2010
Location: NY/NJ

Posts: 9,680
iTrader: (26)

Quote:
Originally Posted by WildBee659 View Post
Nice info to know. We have the same E93's but different tune. I just have a PPK and PE, and happy with it. With a Dinan tune my rear tires wouldn't last long.LOL

Maybe after the warranty expires in 6yrs/100k miles. I used to trade my cars more often, but now I keep them longer and save some $$$$. My 07 "SuperBee" has 105k+ and still going strong. My E93 is awesome, IMHO, and having a convertible in FL is
Yep, very cool Bee! Yea, I hear that brother- this one is with me for the long haul, or until the factory warranty is up Oh don't even get me started about my rear tires
Dark_Knight_335 is offline   United_States
0
Reply With Quote
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 09:12 AM.




e90post
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