Individual Spark with cops, lost tach signal - 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 11-12-2009, 11:39 PM   #1
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default Individual Spark with cops, lost tach signal

Please throw me a bone. I'm sure this has been discussed. I have not done a thorough search. It's been a long day. Work, gym, wiring individual spark with cops, and removing injector harness to prepare the wiring for sequential injection. I just came in from the garage.

I installed the COPs yesterday in batch fire, and I had a tach signal.

I wired the harness for individual spark, and now I don't have a tach signal at the dash. The car runs like a champ and the tunerstudio tach seems to work.

I also changed my tunerstudio spark setting from wasted spark to coil on plug.

I will continue to search in the meantime

Last edited by miatauser884; 11-12-2009 at 11:58 PM.
miatauser884 is offline   Reply With Quote
Old 11-12-2009, 11:50 PM   #2
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

You divided by zero. Fail.

Troubleshooting sucks. Pull tach signal from the tach output pin on the MS and win at life.
Not only does it add lenght and girth, but also saves mass because you can pull out the 5 extra ounces of wire and resistor from your cops harness that you no longer need. Adding lightness FTW
Ben is offline   Reply With Quote
Old 11-12-2009, 11:57 PM   #3
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default

It's got to be fixable though. The only thing I changed is the trigger inputs. Batch to individual.

However, wiring straight to the diypnp would probably offer the most trouble free solution.
miatauser884 is offline   Reply With Quote
Old 11-13-2009, 12:01 AM   #4
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Yeah, the only explanation is a wiring error, and it was an error you didn't even need to make because the MS has a tach out pin.
Ben is offline   Reply With Quote
Old 11-13-2009, 12:08 AM   #5
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default

I'll check my wiring. If I don't see anything obvious then I will use the tach output. It seems almost pointless at this point to have used the ignitor. I could have just wired everything straight from MS.

I swear I read a post recently that suggested wiring the tach signal wire to only one of the cops. I believe the reason was because that tach will get conflicting signals when run in individual spark mode if the tach signal wire is connected to all four cops. (Which is the case if they are running in wasted spark mode)

Last edited by miatauser884; 11-13-2009 at 12:37 AM.
miatauser884 is offline   Reply With Quote
Old 11-13-2009, 01:39 AM   #6
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,914
Default

The tach needs to see one pulse per ignition event. If you're connected only to one coil, and running full sequential, the tach will indicate 1/4 of actual RPM.

When running wasted spark, you need only connect to one of the two coils in each pair. In practice, it should make no difference if you go ahead and connect to all four of 'em.
Joe Perez is offline   Reply With Quote
Old 11-13-2009, 01:06 PM   #7
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default

Quote:
Originally Posted by Ben View Post
You divided by zero. Fail.

Troubleshooting sucks. Pull tach signal from the tach output pin on the MS and win at life.
Not only does it add lenght and girth, but also saves mass because you can pull out the 5 extra ounces of wire and resistor from your cops harness that you no longer need. Adding lightness FTW
I thought the resistor was only if you didn't have a tach in the dash.

"1K resistor (Standalone ECU installs only - jump IG- to B+ in the diagnostics box if you have no tach in your gauge cluster)"

Or is this referring to no tach signal.

I did not use a 1k resistor. HAd tach with wasted spark, no tach with individual.
miatauser884 is offline   Reply With Quote
Old 11-14-2009, 02:25 AM   #8
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default

It appears that I fried one of my cops. Cyl number four. I'm pretty sure it happened when I was trying to start the car and I had the firing order mixed up. I thought I saw a little puff of smoke come from somewhere by the rear of the motor. Then I thought I was crazy.

Does turning the engine over with the firing order mixed up sound like something that could fry a cop? I want to make sure that I don't tear up another one.

On a positive note I got the sequential injection wired up and it ran the car on three cylinders.
miatauser884 is offline   Reply With Quote
Old 11-14-2009, 02:42 PM   #9
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,914
Default

Quote:
Originally Posted by djp0623 View Post
I thought the resistor was only if you didn't have a tach in the dash.

"1K resistor (Standalone ECU installs only - jump IG- to B+ in the diagnostics box if you have no tach in your gauge cluster)"
It means "if the tach does not work, then install this resistor."



Quote:
Originally Posted by djp0623 View Post
Does turning the engine over with the firing order mixed up sound like something that could fry a cop? I want to make sure that I don't tear up another one.
Damn near impossible to kill one simply by having the order wrong. Now, if the output driving it were on all the time, that'd do it.
Joe Perez is offline   Reply With Quote
Old 11-15-2009, 12:56 PM   #10
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default Ignition settings

Here are my individual spark ignition settings and sequential injection settings

After the sight came back up today. I can't upload pictures. I will upload pic of settings as soon as I am able.

Last edited by miatauser884; 11-15-2009 at 01:10 PM.
miatauser884 is offline   Reply With Quote
Old 11-15-2009, 03:16 PM   #11
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default ignition settings

Ok, the uploading feature is working for me again.

Here are my ignition and injection settings. Do you see any problems with them?

miatauser884 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM
01-05 Fab9 PNP COPs (used) FrankB Miata parts for sale/trade 6 09-30-2015 12:48 PM
Are my coils failing? viriiguy General Miata Chat 5 09-28-2015 08:39 PM
WTB HPDE miata - Texas Voltwings Cars for sale/trade 0 09-27-2015 07:40 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 12:46 AM.