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


Go Back   ZPOST > BMW Z4 Technical Talk > Engine, Exhaust, Drivetrain Modifications
  TireRack

SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS!
Post Reply
 
Thread Tools Search this Thread
      05-02-2019, 02:13 AM   #1
sirhodjibob
Enlisted Member
19
Rep
49
Posts

Drives: 2006 Interlagos Blue Z4MR
Join Date: Aug 2015
Location: Las Vegas, NV

iTrader: (0)

Alpha N

As someone still new to this platform (and Alpha N) I came across this article and found it helpful: http://www.bayareamotorsport.com/alphan.html

Hopefully someone else will find it helpful too. Many years ago I deleted the MAF on my DSM- but when tuning those, we replaced it with a GM MAP sensor and ran speed density, so the concept of Alpha N hurt my brain a little bit on how the ECU was measuring the volume of air entering the combustion chamber.

I just finished installing an Evolve carbon fiber airbox and I'm anxiously waiting to install the tune from TTFS, so I'm curious to see how the car performs without the input of a MAF/MAP firsthand and I'm busy researching the impacts. I do see the E46 M3 guys switching to a CSL rail and MAP sensor- just out of curiousity, has this been done on our platform? Is this even possible (or worthwhile) with our newer DME?
Appreciate 0
      05-02-2019, 12:57 PM   #2
WeekendWarriorz
Captain
WeekendWarriorz's Avatar
367
Rep
801
Posts

Drives: 2006 Z4M
Join Date: Jan 2017
Location: Anaheim Hills, CA

iTrader: (3)

Pretty sure no one has defined the tables in the include a MAP, alpha N is the one way to go
__________________
2006 Z4 M Roadster Black/Imola Red, FBO VF-Engineering, e85 Flex Fuel-Sold
2012 BMW 135i N55 DCT Alpine White/Coral Red, FBO, TBI, Full e85, JB4 BEF-Sold
2006 Z4 M Roadster Black/Black
Appreciate 0
      05-02-2019, 11:52 PM   #3
pokeybritches
Colonel
pokeybritches's Avatar
Bahrain
211
Rep
2,641
Posts

Drives: ESS/G-Power Z4M, VF Z4, 987.2
Join Date: Sep 2009
Location: Amwaj

iTrader: (12)

Garage List
2006 BMW Z4M  [5.00]
2006 BMW Z4M  [4.25]
2003 BMW Z4 3.0i  [4.50]
A MAP sensor isn't feasible due to the ITB's. A MAP sensor must be placed in between the throttle body and cylinder head, and with ITB's the only place to put it is in an intake runner which won't give accurate readings.

A MAP sensor would be useful with an aftermarket ECU and forced induction... layering a fuel compensation table (based on boost pressure) on top of an alpha-n base map. RB's use this technique.
__________________


VF Engineering Z4 3.0i, ESS Z4M, G-Power Z4M, 996 Turbo
Appreciate 0
      05-03-2019, 12:54 AM   #4
sirhodjibob
Enlisted Member
19
Rep
49
Posts

Drives: 2006 Interlagos Blue Z4MR
Join Date: Aug 2015
Location: Las Vegas, NV

iTrader: (0)

Quote:
Originally Posted by pokeybritches View Post
A MAP sensor isn't feasible due to the ITB's. A MAP sensor must be placed in between the throttle body and cylinder head, and with ITB's the only place to put it is in an intake runner which won't give accurate readings.

A MAP sensor would be useful with an aftermarket ECU and forced induction... layering a fuel compensation table (based on boost pressure) on top of an alpha-n base map. RB's use this technique.
Well, E46 CSLs use a vacuum rail along the ITBs. But it makes sense. Has anyone tried on our platform?

No shortage of people happy with their Alpha N tunes here it seems, I'm just curious. And trying to pass time while I wait for my tune from TTFS.
Appreciate 0
      05-20-2019, 01:32 AM   #5
mattfwalters
Private First Class
mattfwalters's Avatar
United_States
159
Rep
197
Posts

Drives: 06 Z4MC (Sepang/Sepang/insane)
Join Date: May 2014
Location: Seattle, WA

iTrader: (0)

Quote:
Originally Posted by sirhodjibob View Post
Well, E46 CSLs use a vacuum rail along the ITBs. But it makes sense. Has anyone tried on our platform?

No shortage of people happy with their Alpha N tunes here it seems, I'm just curious. And trying to pass time while I wait for my tune from TTFS.
Tried with the Infinity, had huge issues with signal stability / spikes from the MAP sensor, now running Alpha-N.
Appreciate 0
      05-22-2019, 09:39 PM   #6
sirhodjibob
Enlisted Member
19
Rep
49
Posts

Drives: 2006 Interlagos Blue Z4MR
Join Date: Aug 2015
Location: Las Vegas, NV

iTrader: (0)

I installed my TTFS tune and as part of the custom remote tune I had to datalog. While datalogging the car was actually reporting a MAP value...so it seems to have some way to calculate this and measure manifold pressure. Not sure how, but it was there.

Car runs smoother than stock after Alpha N, and I've tried at sea level and 10,000ft.
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 12:56 PM.




zpost
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, 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