BMW M3 Forum
BMW M3 Forum BMW M3 Gallery BMW M3 Reviews BMW M3 Social Groups BMW M3 Chat M3Forum Sponsors >>
Loading


Mobile M3forum
Go Back   BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X) > BMW M3 Discussions > E46 M3 (2001-2006) > Coding and Tuning
Tire Rack Buy Winter Tires Now!
Not a member? Register Now!
Register Gallery All Albums Garage Search Today's Posts Mark Forums Read Calendar FAQ

Coding and Tuning Discuss all avenues of coding and tuning here!


Reply
 
Thread Tools Display Modes
Old Mon, Sep-23-2019, 11:21:55 PM   #31
SliM3
Registered User
 
SliM3's Avatar
 
Join Date: May 2012
Posts: 2,566
In the garage:
Reputation: 0 SliM3 is on a distinguished road
Location: Atlanta

United States




Default Re: Global Fuel Factor: Definitive & Final Guide to Calbrating MSS54 for Larger Injec

Hey fellas, long time no chat.

A LOT has changed since this original post and I will update as soon as I get the car back together, in a week or two.

The K_HFM_TI_RATE scalar that Terra posted is required fuel mass based on a standard running average of air mass, which is coded in the program file as is the Q-STAT for injector sizing. DME then calculates a required pulse width based on this running average and RPM (the time component of the calc).

Basically, if you change fuel or want to run a little richer across the board then modify this value.


Avg. Mass Air = 15000 grams per hour / 60 = 250 grams per minute

250 gm / 60 = 4.16 grams per second

(4.16 gs / 6 cylinders) = 0.70 grams per sec per cylinder

Fuel requirement for avg. mass air = 0.70 gs / 14.7 AFR = 0.0476 divided by 2 (sequential injection) = 0.02380.


Of course the programmed value is lower to account for 5 bar fuel pressure. I also didn't include standard air density in the calc, but that'll change the value a bit too.

If you want to run E85, change 14.7 to 9.0.

0.70 / 9.0 = 0.03888 (accounting for seq. inj.)
__________________

///M3 '06 Carbon Black

DEMOCRACY is two wolves and a lamb voting on what to have for lunch.
LIBERTY is a well-armed lamb contesting the vote.
-Benjamin Franklin


- Checksum corrections for modified DME partial & full bin files

- CSL SMG Engine Parameters (DME) by Slim

- Fuel adaptations explained

- Checksum Verification
Jump to top SliM3 is offline   Reply With Quote
Sponsored Links
Register now and remove these ads
Old Wed, Oct-16-2019, 12:17:03 AM   #32
Turb02
Registered User
 
Turb02's Avatar
 
Join Date: Aug 2016
Posts: 408
In the garage:
Reputation: 0 Turb02 is on a distinguished road

United States




Default Re: Global Fuel Factor: Definitive & Final Guide to Calbrating MSS54 for Larger Injec

So is the consensus to change the K_HFM_TI_RATE scalar AND the K_TI_GA based on the math in the above post (and first post)

Or

Just the K_HFM_TI_RATE scalar?

I ask because Ive compared my current tune file against a stock 2801 BIN, and there arent any changes to the mentioned scalars (in this thread) that Im seeing as "changed" in my "tuned" BIN, therefore I have to ASSume the fuel/timing/alpha-N/etc tables were modified to account for the 39LB/410cc (@3bar) injectors that are currently installed, and no scalers.

Ive ran out of injectors mixing E85 to E50 (lean up top) and have ID1050s on the shelf. All I need to do is ensure whatever calculation/scalar needs to be, is changed and it ONLY accounts for the larger size of the injectors. Whether thats K_HFM_TI_RATE scalar OR K_TI_GA...or both.

Please advise, and potentially edit the first post once the outcome is determined.

We appreciate ALL the hard work and info-sharing that is on this forum!!
Attached Images
File Type: png Non-table_Tune_Differences.PNG (100.7 KB, 11 views)
__________________

ModeGrau Respray
Active Autowerke Gen3 Stage 2.5 C38-91-AA Headers-Supersprint-Meisterschaft-Vorsteiner-Brembo-AC Schnitzer-BBS-CSL
6MT swapped-RTD shifter-Amber Gang- Dual port Aquamist Advanced Fuel Dynamics E85 CMP Auto Engineering topside subframe reinforcement Redisn v2 plates
Jump to top Turb02 is offline   Reply With Quote
Old Fri, Oct-18-2019, 03:42:56 AM   #33
Ba114
Registered User
 
Join Date: Jan 2016
Posts: 15
Reputation: 0 Ba114 is on a distinguished road

United States




Default Re: Global Fuel Factor: Definitive & Final Guide to Calbrating MSS54 for Larger Injec

Quote:
Originally Posted by terraphantm View Post

And on the topic of fueling, despite what we call them, I'm pretty sure the fuel maps aren't lambda maps. They're just multipliers on the base pulsewidth. Said base pulsewidth is likely calculated by multiplying (or maybe dividing, I don't know the units) RF, RF_TI_CONST, and RPM together to generate a pulse width that will result in a stoich map. That's why the CSL manages with its fuel map being 1.00 entirely - because the fueling is calculated from cylinder filling anyway.

So effectively the fuel maps end up being inverted lambda maps, but that's not really the "design" goal.
Late to the party, but this is exactly the same as the maps for MSD80/81 among others.
Monitor your fuel trims. If trims are positive (lean) in any given cell, increase the value. If Trims are negative (rich), decrease the value.
Jump to top Ba114 is offline   Reply With Quote
Old Fri, Oct-18-2019, 02:32:48 PM   #34
Turb02
Registered User
 
Turb02's Avatar
 
Join Date: Aug 2016
Posts: 408
In the garage:
Reputation: 0 Turb02 is on a distinguished road

United States




Default Re: Global Fuel Factor: Definitive & Final Guide to Calbrating MSS54 for Larger Injec

Found this while digging around the web...not sure if its helpful, but for the injection tables, does this relate to the displayed number is EQ ratio(?)

Quote:
Lambda AFR EQRATIO
0.686 10.08 1.45
0.696 10.23 1.43
0.706 10.38 1.41
0.716 10.53 1.39
0.727 10.69 1.37
0.739 10.86 1.35
0.750 11.03 1.33
0.762 11.20 1.31
0.774 11.38 1.28
0.787 11.57 1.26
0.800 11.76 1.24
0.814 11.96 1.22
0.828 12.17 1.20
0.842 12.38 1.18
0.857 12.60 1.16
0.873 12.83 1.14
0.889 13.07 1.12
0.905 13.31 1.10
0.923 13.57 1.08
0.941 13.84 1.06
0.960 14.11 1.04
0.980 14.40 1.02
1.000 14.70 1.0
1.037 15.25 .96
1.078 15.84 .92
1.121 16.48 .89
1.169 17.18 .85
1.220 17.93 .81
1.276 18.76 .78
1.337 19.66 .74
1.405 20.66 .71

Stoich Afr / commanded Afr = Eq Ratio
Example: 14.7 /13.07 = 1.12
__________________

ModeGrau Respray
Active Autowerke Gen3 Stage 2.5 C38-91-AA Headers-Supersprint-Meisterschaft-Vorsteiner-Brembo-AC Schnitzer-BBS-CSL
6MT swapped-RTD shifter-Amber Gang- Dual port Aquamist Advanced Fuel Dynamics E85 CMP Auto Engineering topside subframe reinforcement Redisn v2 plates
Jump to top Turb02 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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. The time now is 03:00:09 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
M3Forum.com and M3forum.net is in no way sponsored, endorsed or affiliated by or with BMW NA / BMW AG or any of it's subsidiaries or vendors.
BMW and M3 (E90 M3 | E92 M3 | E93 M3 | E46 M3 | E36 M3 | E30 M3) are registered trademarks of BMW AG.
M3Forum Terms of Service
Copyright 1999-2017 M3Forum.com
Discussing Global Fuel Factor: Definitive & Final Guide to Calbrating MSS54 for Larger Injectors in the Coding and Tuning Forum - Discuss all avenues of coding and tuning here! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)