BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications
 
Post Reply
 
Thread Tools Search this Thread
      10-28-2012, 02:25 PM   #1
LarThaL
Colonel
LarThaL's Avatar
100
Rep
2,794
Posts

Drives: 2011 M3
Join Date: Apr 2011
Location: West Springfield, MA

iTrader: (0)

Max possible NA power gain staying legal?

As the title says....what is the maximum possible NA power gain while staying emissions legal? Dinan Stroker doesn't count.
__________________
2011 BMW M3 * 2014 Audi S6 * 2015 Audi S3 * 2015 Porsche Cayman GTS
Appreciate 0
      10-28-2012, 02:59 PM   #2
Mike Benvo
BimmerPost Supporting Vendor
Mike Benvo's Avatar
United_States
153
Rep
5,001
Posts


Drives: Harrop SC M3 / E46 M3 / 7Turbo
Join Date: Apr 2008
Location: SoCal

iTrader: (7)

Garage List
2014 BMW M5  [0.00]
2008 BMW M3  [5.00]
1990 BMW 735i Turbo  [5.00]
2004 BMW M3  [0.00]
Send a message via Skype™ to Mike Benvo
Depends on what state you're in.

In California, pretty much no gain...

We get to be the C in CARB legal where as everyone else is less strict "ARB" legal.

I think technically even changing the rear section here is against the law.
__________________

-----| Like us on Facebook | Instagram || Tuning Information | Remote Coding |-----
----Visit us at www.BPMSport.com - Emotion. Driven. | Toll Free: (888) 557-5133----
Appreciate 0
      10-28-2012, 04:47 PM   #3
FormulaMMM
Lieutenant Colonel
FormulaMMM's Avatar
United_States
47
Rep
1,629
Posts

Drives: E90 M3
Join Date: Oct 2011
Location: Midwest

iTrader: (2)

Semi-educated guess: filter, pulley, tune, catback (if you believe that adds a couple) for maybe 20-25 bhp'ish.
__________________
DCT E90 M3: Akrapovic Evolution, KW Clubsport, Stoptech ST-40 Front + Pagid RS29 | Stock Rear + Stoptech SP, Apex ARC-8 + Hankook Ventus S1 noble2 275/35/18 (street), Apex EC-7 18x10 ET25 + Nitto NT01 275/35/18 (track), tbd...
Past: Velos Designwerks Tune, Megan Racing Catback, Macht Schnell Filter
Appreciate 0
      10-29-2012, 05:01 AM   #4
roastbeef
Major
roastbeef's Avatar
United_States
39
Rep
1,175
Posts

Drives: E92 M3
Join Date: Nov 2010
Location: Orange County, CA

iTrader: (1)

resonators that use factory cats, pulleys, exhaust, intake... each claim around 10hp, but we know those numbers are merely claims. but you can do ricer math and say you have 450+ hp.
__________________
Appreciate 0
      10-29-2012, 09:28 AM   #5
CSanto
Colonel
71
Rep
2,106
Posts

Drives: 2015 BSM/SO M3
Join Date: Feb 2009
Location: New York

iTrader: (2)

Filter is negligible
I'm not crazy about changing drive pullys

I'm not crazy about catless because of the smell, and carbon emissions.

Pretty much just HFC X-pipe and a Tune...Probably about 20-30 whp.
Appreciate 0
      10-29-2012, 10:06 AM   #6
pbonsalb
Colonel
38
Rep
2,068
Posts

Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

iTrader: (3)

How legal does the legal have to be? M3DCTBT is in the Boston area and tunes. He says he can get about 425 rwhp (non dynojet) out of an M3 with 300 cell high flow cats plus other mods and pass plug in OBD2 inspection. I have not yet seen Dynojet results, but even 400 rwhp SAE dynojet through 300 cell cats would be pretty good.
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 -4. The time now is 12:27 PM.




m3post
m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, 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