View unanswered posts | View active topics It is currently Wed Mar 03, 2021 9:48 am



Reply to topic  [ 4 posts ] 
99+ Miata/MX5 4and3 Crank/Cam Combo Decoder 
Author Message
Moderator
User avatar

Joined: Tue Jan 15, 2008 2:31 pm
Posts: 15380
Location: Home sweet home!
Abe, she's all yours, take it away! :-)

Fred.

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Fri Mar 11, 2011 3:44 am
Profile WWW
Moderator
User avatar

Joined: Tue Jan 15, 2008 2:31 pm
Posts: 15380
Location: Home sweet home!
Don't tell me that I'm going to have the NA pattern done before you have this done??? :-p

Fred.

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Wed Mar 23, 2011 2:30 pm
Profile WWW
Moderator
User avatar

Joined: Tue Jan 15, 2008 2:31 pm
Posts: 15380
Location: Home sweet home!
Note, when it says falling, it means at the sensor, these cars have a VR conditioner built into the sensor body, and output a conditioned pulse of unreliable width with an active low that starts on the zero crossing of each tooth and ends wherever depending upon RPM.

AbeFM-via-Jim-edited-by-Fred wrote:
And here is the the data for the M2 (NB) Miata, 1999-2005.

The numbers are crank degrees relative to the #1 TDCC (negative being before and positive after)

Crank signal edges in one engine cycle ( engine cycle = 720 crank degrees), 16 edges total:

falling edge at -80 ( == 640 )
falling edge at -10 ( == 710)
falling edge at 100
falling edge at 170
falling edge at 280
falling edge at 350
falling edge at 460
falling edge at 530

Cam sync signal edges in one engine cycle, 6 edges total:

falling edge at 37
falling edge at 377
falling edge at 421

From an old post in this section, dug out by Abe!

It needs twisting somewhat to generate a usable FreeEMS angle set.

Maybe later.

EDIT: Five years later:

Image

Image

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Thu Apr 28, 2011 9:33 pm
Profile WWW
Moderator
User avatar

Joined: Tue Jan 15, 2008 2:31 pm
Posts: 15380
Location: Home sweet home!
Formal issue for creation of this decoder:

http://issues.freeems.org/view.php?id=114

Abe, you might wanna monitor this thread and issue! :-p

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Tue Jun 14, 2011 7:23 pm
Profile WWW
Display posts from previous:  Sort by  
Reply to topic   [ 4 posts ] 

Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group
Designed by ST Software for PTF. ColorizeIt.