Anyone make an ERG "SIM" - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 03-24-2010, 03:05 PM   #1
Elite Member
Thread Starter
iTrader: (10)
 
IcantDo55's Avatar
 
Join Date: Apr 2007
Location: VA Beach
Posts: 1,764
Total Cats: 18
Default Anyone make an ERG "SIM"

Got a free header for my DD 2000 and it has no provision for the EGR tube. I don't mind deleting it but I don't want to stare at the CEL light. I know MS will solve it, but I'm not installing it yet.

So how do I fake an EGR signal to the ECM.
IcantDo55 is offline   Reply With Quote
Old 03-24-2010, 03:25 PM   #2
Junior Member
iTrader: (2)
 
Join Date: Mar 2010
Location: Canada
Posts: 411
Total Cats: 0
Default

Can't you just run a resistor in-line to simulate a signal? That would cost you about...... $0.03. Just measure the voltage with an Ohm meter and find a resistor (or two) to match that reading and solder it in-line.
E-NA6CE is offline   Reply With Quote
Old 03-24-2010, 03:28 PM   #3
Elite Member
Thread Starter
iTrader: (10)
 
IcantDo55's Avatar
 
Join Date: Apr 2007
Location: VA Beach
Posts: 1,764
Total Cats: 18
Default

Quote:
Originally Posted by E-NA6CE View Post
Can't you just run a resistor in-line to simulate a signal? That would cost you about...... $0.03. Just measure the voltage with an Ohm meter and find a resistor (or two) to match that reading and solder it in-line.
Sounds good. Some one got a 99-00 in running condition they can figure out what I need? Mine is currently in many pieces.
IcantDo55 is offline   Reply With Quote
Old 03-24-2010, 03:42 PM   #4
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

The next question is, does the ecu detect a constant on or off signal from the egr as a bad egr?
neogenesis2004 is offline   Reply With Quote
Old 03-24-2010, 03:44 PM   #5
Junior Member
iTrader: (2)
 
Join Date: Mar 2010
Location: Canada
Posts: 411
Total Cats: 0
Default

Quote:
Originally Posted by neogenesis2004 View Post
The next question is, does the ecu detect a constant on or off signal from the egr as a bad egr?
Ooooo..... that's a good question, and one that I never even would have thought of. The plot thickens.......
E-NA6CE is offline   Reply With Quote
Old 03-24-2010, 03:47 PM   #6
Hittin' Boost & Cones
iTrader: (2)
 
240_to_miata's Avatar
 
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,572
Total Cats: 11
Default

I believe the EGR code also checks for a change in engine vacuum with it open vs closed.

I have my egr solinoid still on the IM but with it blocked off where it goes to the exhuast. I never get CELs for it (knock on wood) ...but i guess I could make it unblocked. It is looking for change in vacuum, it doesnt know if it is exhaust air or ambient air.
240_to_miata is offline   Reply With Quote
Old 03-24-2010, 03:53 PM   #7
Senior Member
iTrader: (14)
 
Join Date: Oct 2006
Location: Las Cruces, NM
Posts: 1,404
Total Cats: 263
Default

You could mount a small air filter on the EGR inlet port on the intake manifold and leave the EGR valve on so that it takes in fresh air instead of exhaust.
99mx5 is offline   Reply With Quote
Old 03-24-2010, 04:11 PM   #8
Elite Member
Thread Starter
iTrader: (10)
 
IcantDo55's Avatar
 
Join Date: Apr 2007
Location: VA Beach
Posts: 1,764
Total Cats: 18
Default

Quote:
Originally Posted by 99mx5 View Post
You could mount a small air filter on the EGR inlet port on the intake manifold and leave the EGR valve on so that it takes in fresh air instead of exhaust.
I bet it also needs positive pressure like the header would give it...right?


And how would it meter it? It would be introduced after the MAF so it would be un-metered air causing a lean condition. Maybe the ECU compensates for that???

Your right, the plot thickens.
IcantDo55 is offline   Reply With Quote
Old 03-24-2010, 04:13 PM   #9
Elite Member
Thread Starter
iTrader: (10)
 
IcantDo55's Avatar
 
Join Date: Apr 2007
Location: VA Beach
Posts: 1,764
Total Cats: 18
Default

Quote:
Originally Posted by neogenesis2004 View Post
The next question is, does the ecu detect a constant on or off signal from the egr as a bad egr?

Hmmmmm.....
IcantDo55 is offline   Reply With Quote
Old 03-24-2010, 04:13 PM   #10
Hittin' Boost & Cones
iTrader: (2)
 
240_to_miata's Avatar
 
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,572
Total Cats: 11
Default

doubt it could tell the difference if its only measuring difference in manifold vacuum.
240_to_miata is offline   Reply With Quote
Old 03-24-2010, 07:13 PM   #11
Senior Member
iTrader: (14)
 
Join Date: Oct 2006
Location: Las Cruces, NM
Posts: 1,404
Total Cats: 263
Default

The EGR valve wouldn't need positive pressure since the manifold is under vacuum when the valve opens. Good point about the unmetered air. I don't think it needs to be metered as the amount of recirculated exhaust is not directly measured. The ECU uses the factory "boost" sensor to measure the IM pressure change when it opens and closes the EGR valve. If you wanted to have it metered as intake air, you could tee the air source from the valve cover hose which connects to the intake after the MAF/AFM.
99mx5 is offline   Reply With Quote
Old 03-24-2010, 08:15 PM   #12
Hittin' Boost & Cones
iTrader: (2)
 
240_to_miata's Avatar
 
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,572
Total Cats: 11
Default

lol i forgot there are people here with mafs
240_to_miata is offline   Reply With Quote
Old 03-25-2010, 03:45 AM   #13
Elite Member
Thread Starter
iTrader: (10)
 
IcantDo55's Avatar
 
Join Date: Apr 2007
Location: VA Beach
Posts: 1,764
Total Cats: 18
Default

Quote:
Originally Posted by 240_to_miata View Post
lol i forgot there are people here with mafs
Only on my DD
IcantDo55 is offline   Reply With Quote
Old 04-13-2010, 02:29 PM   #14
Hittin' Boost & Cones
iTrader: (2)
 
240_to_miata's Avatar
 
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,572
Total Cats: 11
Default

i got a CEL today for EGR . i tried running stock ecu, injectors, maf and just open my egr port to atmosphere. I didnt have a problem with unmetered air, but after 2 drive cycles it thru the code p0470... egr

I just said screw it and bought the egr pipe for the FM manifold. hopefully i will be fine after that.
240_to_miata is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Raleigh: Fiberglass headlight scope, 1.6L ECU, AFM, Hardtop latches, more bigmackloud Miata parts for sale/trade 13 09-22-2017 01:34 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Noob to Miataturbo from MA JxPhan Meet and Greet 3 10-02-2015 03:17 AM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM


Thread Tools

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 09:58 PM.