Want to go Parallel why shouldn't I? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


ECUs and Tuning Discuss Engine Management, Tuning, & Programming

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 10-17-2011, 04:09 PM   #1
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Dec 2009
Posts: 127
Total Cats: 4
Default Want to go Parallel why shouldn't I?

I going to get my ms2 built shortly. It will cost me the same to go parallel or stand alone.

I want to go parallel for stock idle, A/C.


Seeing how parallel will alow spark and fuel to be tuned is there any reason to go stand alone?

Setup will be

FM2 kit
8 psi
Track Speed Engineering radiator
big oil cooler
AnnorexicRoadster is offline   Reply With Quote
Old 10-17-2011, 04:15 PM   #2
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

MS2 standalone did a better job of idle control than the stock computer did in parallel in my 99. Don't know what year car you have, but it looks like the NB stock computer varied ignition timing as part of the idle control scheme more so than varying duty cycle on the idle valve. Allowing the stock computer to control idle valve without allowing it to control spark doesn't work as well as setting up the MS2 standalone.
Ben is offline   Reply With Quote
Old 10-17-2011, 04:24 PM   #3
Elite Member
 
Chiburbian's Avatar
 
Join Date: Feb 2008
Location: Gilberts, IL
Posts: 2,158
Total Cats: 131
Default

This is a noob question I am sure...

Is it still considered a parallel install if you have the MS taking control of IDLE, AC, Spark, Fuel, etc - leaving the stock computer as basically an "observer" of the whole thing?

At what point does chopping off the stock (2001 for example) ECU's ability to make changes cause it to throw OBDII fits?

I know I am adding a lot of complexity here, but I want to retain the function of my immobilizer in some way but still have the MSIII doing as much as possible.
Chiburbian is offline   Reply With Quote
Old 10-17-2011, 04:43 PM   #4
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,833
Total Cats: 1,786
Default

The stock ecu still thinks it's doing something, so it stays fairly happy unless you're causing misfires or something.

what year miata is this for? if idle and a/c are the only concern, then I would still to standalone...if emissions are the reason, then yeah.
Braineack is offline   Reply With Quote
Old 10-17-2011, 04:47 PM   #5
Supporting Vendor
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,440
Total Cats: 198
Default

Quote:
Originally Posted by Ben View Post
MS2 standalone did a better job of idle control than the stock computer did in parallel in my 99. Don't know what year car you have, but it looks like the NB stock computer varied ignition timing as part of the idle control scheme more so than varying duty cycle on the idle valve. Allowing the stock computer to control idle valve without allowing it to control spark doesn't work as well as setting up the MS2 standalone.
I've been saying this for years, I had this problem with my parallel MS1. It was brilliant in fuel-only mode, however when I switched to spark control as well, it was sad. I switched to MS2 standalone and never looked back.
Reverant is offline   Reply With Quote
Old 10-17-2011, 05:01 PM   #6
Elite Member
iTrader: (1)
 
Join Date: May 2009
Location: Jacksonville, FL
Posts: 4,682
Total Cats: 216
Default

The stock ECU doesnt do an exceptional job at controlling idle once youve put a turbo on.
I had lots of idle dipping problems under braking. Still no clue what exactly was happening...
Full_Tilt_Boogie is offline   Reply With Quote
Old 10-17-2011, 05:31 PM   #7
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 406
Default

Quote:
Originally Posted by Chiburbian View Post
This is a noob question I am sure...

Is it still considered a parallel install if you have the MS taking control of IDLE, AC, Spark, Fuel, etc - leaving the stock computer as basically an "observer" of the whole thing?

At what point does chopping off the stock (2001 for example) ECU's ability to make changes cause it to throw OBDII fits?
removing any of the normal sensors completely will throw codes. sharing them wont.

Quote:
I know I am adding a lot of complexity here, but I want to retain the function of my immobilizer in some way but still have the MSIII doing as much as possible.
how about stock ECU does fuel pump only.
y8s is offline   Reply With Quote
Old 10-17-2011, 05:54 PM   #8
Elite Member
 
Chiburbian's Avatar
 
Join Date: Feb 2008
Location: Gilberts, IL
Posts: 2,158
Total Cats: 131
Default

Quote:
Originally Posted by y8s View Post
how about stock ECU does fuel pump only.
Perfect! The answer was staring me in the face.

Also, Braineak is a perceptive dude. That is all I am saying...

Not to threadjack, but my car doesn't even have a turbo on it yet, so this is all for educational purposes of course. (in my case)
Chiburbian is offline   Reply With Quote
Old 10-17-2011, 05:56 PM   #9
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,833
Total Cats: 1,786
Default

Quote:
Originally Posted by Chiburbian View Post
Also, Braineak is a perceptive dude. That is all I am saying...

go on...


Braineack is offline   Reply With Quote
Old 10-17-2011, 06:14 PM   #10
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 406
Default

Quote:
Originally Posted by Chiburbian View Post
Perfect! The answer was staring me in the face.
you may want to check that the immobilizer DOES indeed shut down the fuel pump.
y8s is offline   Reply With Quote
Old 10-17-2011, 06:26 PM   #11
Elite Member
 
Chiburbian's Avatar
 
Join Date: Feb 2008
Location: Gilberts, IL
Posts: 2,158
Total Cats: 131
Default

But even if it does not shut down the pump, is there a signal that it DOES keep powered when the proper key is inserted? If that is the case, I should be able to rob that signal to power a relay on the fuel pump. No?

At work and without looking at my references this is all hypothetical BS though... Maybe I need to get a non immobilizer key cut for testing purposes.

EDIT: Webernets is saying that it controls ignition? More research needed.
Chiburbian is offline   Reply With Quote
Old 10-17-2011, 09:39 PM   #12
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 406
Default

the immobilizer is mated with a specific ECU. it doesn't turn something on but rather enables the ECU to turn something on.
y8s is offline   Reply With Quote
Old 10-18-2011, 04:06 PM   #13
Elite Member
 
Chiburbian's Avatar
 
Join Date: Feb 2008
Location: Gilberts, IL
Posts: 2,158
Total Cats: 131
Default

Quote:
Originally Posted by y8s View Post
the immobilizer is mated with a specific ECU. it doesn't turn something on but rather enables the ECU to turn something on.
Well, that's what I mean. But what exactly is it (the ECU) turning on? The ECU itself?
Chiburbian is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
NB oil pressure gauge runs backward TorqueZombie Engine Performance 7 10-11-2015 07:10 AM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM
3rd Time's a Charm...hopefully. zephyrusaurai Meet and Greet 2 09-28-2015 11:59 PM
Need ideas mounting IWG actuator JasonC SBB DIY Turbo Discussion 7 09-23-2015 08:25 PM
In what world... curly MEGAsquirt 11 09-22-2015 12:54 PM


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:02 PM.