BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

Post Reply
 
Thread Tools Search this Thread
      02-03-2013, 03:23 AM   #1
racer_x
Second Lieutenant
 
racer_x's Avatar
 
Drives: When He Has To
Join Date: Jan 2013
Location: Sydney

Posts: 208
iTrader: (0)

Turbo kick @ 2500 RPM

Hi Guys,

Please forgive the noob questions. I am new to these turbo BMs.

I test drove my first 135i today and noticed the car was not as smooth as I expected when accelerating. The car is a 2008 model with @ 50,000 kms.

It seemed to me that around 2500 the turbos kick in noticeably. The car did not seem to be down on power or anything but it was not a smooth build up of power as the revs rose. Is this normal? Or does it need tuning?

Please forgive my ignorance but I've not driven a lot of 6 cylinder turbos. I was expecting a power deliver similar to a normally aspirated engine?

Thanks in advance.
racer_x is offline  
0
Reply With Quote
      02-03-2013, 03:30 AM   #2
pavo335
Banned
 
pavo335's Avatar
 
Drives: 3.5 wheeler
Join Date: Feb 2012
Location: sydney

Posts: 2,981
iTrader: (0)

Quote:
Originally Posted by racer_x
Hi Guys,

Please forgive the noob questions. I am new to these turbo BMs.

I test drove my first 135i today and noticed the car was not as smooth as I expected when accelerating. The car is a 2008 model with @ 50,000 kms.

It seemed to me that around 2500 the turbos kick in noticeably. The car did not seem to be down on power or anything but it was not a smooth build up of power as the revs rose. Is this normal? Or does it need tuning?

Please forgive my ignorance but I've not driven a lot of 6 cylinder turbos. I was expecting a power deliver similar to a normally aspirated engine?

Thanks in advance.
Did it have meth?
pavo335 is offline  
0
Reply With Quote
      02-03-2013, 04:02 AM   #3
JB4-335
Colonel
 
JB4-335's Avatar
 
Drives: E92 BSM & E91 BSM
Join Date: Feb 2011
Location: Australia

Posts: 2,547
iTrader: (1)

LOL at pavo.....meth

I bet the seller has a piggy back tune already on the car so it could be running around 13-14psi compared to the stock 8psi. These cars have a lot of torque especially when running a little more boost. Power does come on quite strong when the turbos spool up.
__________________
JB4
JB4-335 is offline   Australia
0
Reply With Quote
      02-03-2013, 04:03 AM   #4
TS135i
piggy in the mirror
 
Drives: 2013 6MT 135i
Join Date: Jan 2013
Location: Sydney

Posts: 427
iTrader: (0)

I have driven three of these cars and all three felt different, I'll be driving a forth next month with PPK so I'm guessing it will feel different again.
__________________
135i Coupe N55 PPK
TS135i is offline   Australia
0
Reply With Quote
      02-03-2013, 04:12 AM   #5
sparoz
Brigadier General
 
sparoz's Avatar
 
Drives: VO 1///M; AW X3 30d
Join Date: Jun 2008
Location: Sunshine Coast

Posts: 4,819
iTrader: (0)

Quote:
Originally Posted by racer_x View Post
Hi Guys,

Please forgive the noob questions. I am new to these turbo BMs.

I test drove my first 135i today and noticed the car was not as smooth as I expected when accelerating. The car is a 2008 model with @ 50,000 kms.

It seemed to me that around 2500 the turbos kick in noticeably. The car did not seem to be down on power or anything but it was not a smooth build up of power as the revs rose. Is this normal? Or does it need tuning?

Please forgive my ignorance but I've not driven a lot of 6 cylinder turbos. I was expecting a power deliver similar to a normally aspirated engine?

Thanks in advance.
No, it doesn't drive like a N/A - that's the point of a turbo. You might have it confused with the response is very close to a N/A. However, never got that in my 135i before, but with the 1M stock tune it was noticeable when the overboost kicks in. It almost felt like it is running out of steam and all of a sudden you get more boost.

I had a ESS tune which gives a much more linear delivery of power.

I suspect the example you were driving has a tune and not tuned very well.
__________________
1///M - Valencia Orange
X3 30d - Alpine White

Under Six Seconds http://www.under6s.com
sparoz is offline   Australia
0
Reply With Quote
      02-03-2013, 04:12 AM   #6
Jeef Beef
Lord Captain Commander
 
Jeef Beef's Avatar
 
Drives: a sleeper
Join Date: Oct 2009
Location: Sydney, Australia

Posts: 3,089
iTrader: (0)

You must've hit VTEC
__________________

E82 135i M-sport: SGM/6MT/Black
Jeef Beef is offline   Australia
0
Reply With Quote
      02-03-2013, 04:30 AM   #7
racer_x
Second Lieutenant
 
racer_x's Avatar
 
Drives: When He Has To
Join Date: Jan 2013
Location: Sydney

Posts: 208
iTrader: (0)

Quote:
Originally Posted by Jeef Beef View Post
You must've hit VTEC
That's what it reminded me of... My mate's S2000. Except this was much lower in the rev range.
racer_x is offline  
0
Reply With Quote
      02-03-2013, 05:23 AM   #8
racer_x
Second Lieutenant
 
racer_x's Avatar
 
Drives: When He Has To
Join Date: Jan 2013
Location: Sydney

Posts: 208
iTrader: (0)

Quote:
Originally Posted by JB4135 View Post
LOL at pavo.....meth

I bet the seller has a piggy back tune already on the car so it could be running around 13-14psi compared to the stock 8psi. These cars have a lot of torque especially when running a little more boost. Power does come on quite strong when the turbos spool up.
According to the seller, the car is stock. Unmolested.

I read somewhere that BMW USA was flashing the N54 ECUs with some weird tune which introduced more lag to add to the longevity of the HPFP, could this be the case here?

Last edited by racer_x; 02-03-2013 at 05:55 AM.
racer_x is offline  
0
Reply With Quote
      02-03-2013, 06:22 AM   #9
Dackelone
Moderator
 
Dackelone's Avatar
 
Drives: 135i Silber mit/Rot 6MT N54
Join Date: Feb 2010
Location: Bayern, Germany

Posts: 16,133
iTrader: (1)

Quote:
Originally Posted by racer_x View Post
According to the seller, the car is stock. Unmolested.

I read somewhere that BMW USA was flashing the N54 ECUs with some weird tune which introduced more lag to add to the longevity of the HPFP, could this be the case here?
Yup. For N55's too. The SW update also includes some anti-tuner stuff too, besides the added "lag" tune. Basically, when you unlock the car... if you start to hear the LPFP (low pressure fuel pump) the car has that SW update. Early cars did not do that.


Dack
Dackelone is offline   Germany
0
Reply With Quote
      02-03-2013, 07:26 AM   #10
sbce90
Me Boosta
 
sbce90's Avatar
 
Drives: 320i / MB C63 / VW up!
Join Date: Jan 2010
Location: Sydney, Australia

Posts: 5,488
iTrader: (3)

Quote:
Originally Posted by Jeef Beef View Post
You must've hit VTEC
na Lift!
sbce90 is offline   Australia
0
Reply With Quote
      02-03-2013, 07:48 AM   #11
John_01
Colonel
 
John_01's Avatar
 
Drives: E90 325i, E82 135i
Join Date: Mar 2009
Location: Sydney, Australia

Posts: 2,004
iTrader: (0)

My N55 has very smooth torque delivery. Torque feels like it gradually builds to 2000RPM and pretty constant for most of the rev range. It certainly isn't missing any bottom end torque. To me the top-end feels a bit of a disappointment by comparison.
John_01 is offline   Australia
0
Reply With Quote
      02-03-2013, 09:29 AM   #12
Pig Farmer
Captain
 
Drives: 2009 BMW 135i
Join Date: May 2010
Location: Florida

Posts: 664
iTrader: (0)

If the car is not tuned, I think Dack is spot on. BMW's updated software flash introduced some serious lag below 2200-2500 rpm. In order to get the same response as before, you would need to double your throttle inputs. The PPK corrects this issue and gives you a very linear torque curve and immediate throttle response. The PPK is not the most powerful tune but power delivery is very predictable.
Pig Farmer is offline  
0
Reply With Quote
      02-03-2013, 09:07 PM   #13
Rukuss
Major
 
Rukuss's Avatar
 
Drives: 135i
Join Date: Aug 2010
Location: Portland

Posts: 1,258
iTrader: (-1)

Quote:
Originally Posted by Pig Farmer View Post
If the car is not tuned, I think Dack is spot on. BMW's updated software flash introduced some serious lag below 2200-2500 rpm. In order to get the same response as before, you would need to double your throttle inputs. The PPK corrects this issue and gives you a very linear torque curve and immediate throttle response. The PPK is not the most powerful tune but power delivery is very predictable.
Does Cobb correct this too?
Rukuss is online now   United_States
0
Reply With Quote
      02-03-2013, 09:18 PM   #14
Pig Farmer
Captain
 
Drives: 2009 BMW 135i
Join Date: May 2010
Location: Florida

Posts: 664
iTrader: (0)

I'm not sure. Every car seems to respond a little different. A number of people have mentioned that both the Cobb and JB4 tend to surge a bit when the boost dials up. Some people claim that they don't experience any surge. That being said, the stage 2 Dinan and GIAC tunes seem to get the best reviews when it comes to smooth power delivery but they are not cheap and require a dealer to flash the ECU.
Pig Farmer is offline  
0
Reply With Quote
      02-03-2013, 09:37 PM   #15
Jeef Beef
Lord Captain Commander
 
Jeef Beef's Avatar
 
Drives: a sleeper
Join Date: Oct 2009
Location: Sydney, Australia

Posts: 3,089
iTrader: (0)

Any sort of tune that increases your power substantially should result in more 'surge' as you describe. This is simply because the turbos will take a bit longer to reach the higher boost level.
__________________

E82 135i M-sport: SGM/6MT/Black
Jeef Beef is offline   Australia
0
Reply With Quote
      02-06-2013, 05:13 AM   #16
racer_x
Second Lieutenant
 
racer_x's Avatar
 
Drives: When He Has To
Join Date: Jan 2013
Location: Sydney

Posts: 208
iTrader: (0)

I drove an 09 model (stock, no mods) tonight and it was noticeably smoother. The seller tells me that the HPFP and the injectors were replaced as a precaution under warranty. He was not sure if they upgraded the ECU firmware or not.
racer_x is offline  
0
Reply With Quote
      02-06-2013, 05:28 AM   #17
Wrniknbl
It's just not cricket
 
Wrniknbl's Avatar
 
Drives: 135i N55
Join Date: Jul 2012
Location: Aus

Posts: 75
iTrader: (0)

Just had my fmic and charge pipe upgraded surge is now one looong pull - best of all I have stock DP - so I know it's only gonna get better!
Wrniknbl is offline   Australia
0
Reply With Quote
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 11:03 PM.




1addicts
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