bimmerpost/
BMW M2 and 2-Series Coupe
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
home
BMW M2 Forums 2023+ (G87) BMW M2 G87 General Topics

Post Reply
 
Thread Tools Search this Thread
      10-29-2022, 02:24 PM   #1
curtdragon
Car'a'carn
559
Rep
888
Posts

Drives: I drive one
Join Date: Feb 2008
Location: Nashville

iTrader: (0)

Thoughts on how the power is limited

For the M3/4 I found this

From Car and Driver

"As a refresher, the standard $70,895 M3 comes only with a six-speed stick and produces 473 horsepower and 406 pound-feet of torque from a wonderfully smooth twin-turbo 3.0-liter inline-six. Opting for the $2900 Competition upgrade, however, necessitates the fitment of an eight-speed automatic, yet brings more turbo boost (24.7 psi versus 18.9) and an additional 30 ponies and 73 pound-feet."

Do you think they just further reduced the boost?
Or do you think they remapped the ecu
Appreciate 0
      10-29-2022, 02:36 PM   #2
GrannyShiftG80
Captain
GrannyShiftG80's Avatar
1349
Rep
903
Posts

Drives: G20 330i, G80 M3 6MT
Join Date: Aug 2014
Location: Canada

iTrader: (0)

Remapping the ecu = reducing the boost
Appreciate 2
T_U_D6698.00
ronin130131067.00
      10-29-2022, 02:50 PM   #3
curtdragon
Car'a'carn
559
Rep
888
Posts

Drives: I drive one
Join Date: Feb 2008
Location: Nashville

iTrader: (0)

Yeah no.
So getting a boost controller is remmaping the ECU?

Yes I get that the turbo wastegate is electronically controlled by the ECU. But obviously I’m not talking about that.

I’m asking if they’ve done exactly the same thing which was to limit the boost and no other changes.
Appreciate 0
      10-29-2022, 03:45 PM   #4
boostspoon
Second Lieutenant
237
Rep
259
Posts

Drives: M2
Join Date: Apr 2018
Location: USA

iTrader: (0)

Quote:
Originally Posted by curtdragon View Post
Yeah no.
So getting a boost controller is remmaping the ECU?

Yes I get that the turbo wastegate is electronically controlled by the ECU. But obviously I’m not talking about that.

I’m asking if they’ve done exactly the same thing which was to limit the boost and no other changes.
They don't increase/decrease boost without mapping.
Appreciate 0
      10-29-2022, 05:02 PM   #5
trey100
Colonel
trey100's Avatar
United_States
1129
Rep
2,564
Posts

Drives: 2020 M2 Competition
Join Date: Jul 2007
Location: New York

iTrader: (0)

I'm actually more surprised that 5+ more pounds of boost only netted 30 HP. I had read somewhere that the dynos of comp and non-comp were similar torque-wise so I assumed the boost delta was very small between the 2.
Appreciate 0
      10-30-2022, 10:08 AM   #6
Hendo741
Chief Petty Officer
Hendo741's Avatar
662
Rep
530
Posts

Drives: 22 M4CX / 22 X3MC
Join Date: Dec 2021
Location: US

iTrader: (0)

The car and driver article is wrong and misleading. Not sure where they came up with those figures, but newer BMW engines (S58/B58) don't work on static boost tables. I have an M4 Comp xdrive and have seen the requested boost vary from <16 all the way to 21+ based on conditions. Never ever have i seen anywhere near 25. JB4 map 4 which suggests E30 is an absolute value of 25 psi.

IAT seems to have the biggest influence as it will run lower boost and higher ignition advance with lower IAT, and the boost gets higher and timing lower as IATs increase.

Regardless, yes the difference in the 3 engines will be ECU/DME mapping.
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



All times are GMT -5. The time now is 05:47 PM.




g87
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
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