Set timing on a 99 with 90-97 CAS - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 08-24-2008, 02:43 PM   #1
Senior Member
Thread Starter
 
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,497
Total Cats: 81
Question Set timing on a 99 with 90-97 CAS

Hi MTers,

in preparation of my MS1 install on my 99 I try to do as much reading as possible and find as much information to get it running fast and without too much problems.

One of the question that occured to me was, how do I set the 90-97 CAS timing on the 99. If I leave the spark wires on the boomslang connected with the OEM ECU I know that the timing is set fixed to 10° BTDC - so if I am thinking correctly - I should be able to set the MS timing even without a timing light, as I just have to correct the setting in the MS until it shows 10° - is this correct? Or do I have a complete mistake in my thinking?

Thanks for your help.
Zaphod is offline   Reply With Quote
Old 08-24-2008, 03:40 PM   #2
Junior Member
iTrader: (1)
 
Join Date: Jan 2006
Location: in the middle of germany
Posts: 56
Total Cats: 0
Default

Quote:
Originally Posted by Zaphod View Post
Hi MTers,

in preparation of my MS1 install on my 99 I try to do as much reading as possible and find as much information to get it running fast and without too much problems.

One of the question that occured to me was, how do I set the 90-97 CAS timing on the 99. If I leave the spark wires on the boomslang connected with the OEM ECU I know that the timing is set fixed to 10° BTDC - so if I am thinking correctly - I should be able to set the MS timing even without a timing light, as I just have to correct the setting in the MS until it shows 10° - is this correct? Or do I have a complete mistake in my thinking?

Thanks for your help.

Hiho,
do you prepare it for stand alone or piggy?
If you going the piggy way without ignition control by the ms, i think you donīt have to touch anything about timing, because your oem ecu takes care of it.
But if i you are going to control the timing with the ms, itīs necessary to do the timing setup with the fixed angle.


Maybe you shoot me an pm, so we could fix it german style.
chico is offline   Reply With Quote
Old 08-24-2008, 04:14 PM   #3
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: 26,315
Total Cats: 1,913
Default

Quote:
Originally Posted by Zaphod View Post
so if I am thinking correctly - I should be able to set the MS timing even without a timing light, as I just have to correct the setting in the MS until it shows 10° - is this correct? Or do I have a complete mistake in my thinking?
You have a complete mistake in your thinking.

The readout in the MegaTune software is not a feedback mechanism showing actual conditions. It's just an adjustment. What you need to do is to connect the MS to the coils (disconnecting them from the stock ECU), set the ignition advance at 10° in Megatune, and then use a timing gun to see whether or not it is in fact at 10°. Then you adjust the trigger angle in the software until the timing gun shows you that the ignition is in fact firing at 10°. That done, release the ignition back to the map by entering -10.

On a first start, I like to disconnect the fuel injector harness and watch the pulley with the timing gun while somebody cranks the engine. This way you can verify that you're not 180° out, and that the timing is at least close, before you actually give the engine any fuel to burn.
Joe Perez is offline   Reply With Quote
Old 08-24-2008, 04:22 PM   #4
Junior Member
 
Join Date: Jan 2006
Location: Toronto
Posts: 182
Total Cats: 0
Default

I was just going to post this question

I'm staging MS in on my '99 this way:
-Connect all sensors to MS including NA CAS
-Take over fuel w/ MS
-Take over spark w/ MS (couple of months)

I've installed the NA CAS.

If I'm just running fuel on MS, do I have to enter a precise trigger angle? I have no way of finding out what that is since the megasquirt isn't firing the coils and the NA CAS isn't connected to the stock ECU (obviously)

Does MS have to know the exact timing to inject the fuel?
fluke is offline   Reply With Quote
Old 08-24-2008, 04:43 PM   #5
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: 26,315
Total Cats: 1,913
Default

No, it doesn't have to be exact for fuel-only. The fuel can be quite a good bit out of phase without you ever noticing.
Joe Perez is offline   Reply With Quote
Old 08-24-2008, 05:23 PM   #6
Junior Member
 
Join Date: Jan 2006
Location: Toronto
Posts: 182
Total Cats: 0
Default

Thanks!
fluke is offline   Reply With Quote
Old 08-25-2008, 03:05 AM   #7
Senior Member
Thread Starter
 
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,497
Total Cats: 81
Default

Thanks @ Chico and Joe Perez - that was, what I did want to know - I want to controll ignition with the MS, so I have to get myself hold of a timing light, when I install the MS. (International Dispatch, August 24, 2008, 4:31 am, ISC MIAMI FL (USPS) - so another couple of days until it has finally cleared the German customs and is in my hands)

Greets
Zaphod is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
TunerStudio timining issue - 90 Miata 1.6 Turbo spec1sef MEGAsquirt 28 05-09-2017 08:03 AM
CAS weirdness Asx MEGAsquirt 5 12-15-2015 12:14 PM
Cannot set Base Timing to 10* Elfering MEGAsquirt 50 10-05-2015 09:04 AM
Flush mount headlight kit 90-97 miata DonPlatt Miata parts for sale/trade 3 09-19-2015 11:23 AM
ME221 Now has Autotune and Long Term Fuel Trim Tables Motorsport-Electronics ECUs and Tuning 0 09-05-2015 09:02 AM


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 03:28 PM.