#1 (permalink)  
Old 10-05-2007, 02:31 PM
FR Wilk's Avatar
FR Wilk FR Wilk is offline
Registered User
  
Join Date: Oct 2007
Posts: 5
ML4.1 calculating ignition advance
ML4.1 What formula do you use for calculating ignition advance?

FR Wilk
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #2 (permalink)  
Old 10-05-2007, 09:11 PM
Alfisto Steve's Avatar
Alfisto Steve Alfisto Steve is offline
Senior Member
Platinum Subscriber
  
Join Date: Dec 2003
Location: VB, VA
Posts: 8,154
What do you mean calculate? On 164 the computer does all the work.
__________________
Ciao, Alfisto Steve
Virginia Beach, VA
AROC 164 Tech Advisor
s.patchin@aroc-usa.org
http://www.aroc-usa.org/

Daily drivers: USA models 91 Bianco 164B 5-speed - ALFA 4ME, 91 Argento aka "Quik Silver" 164B w/AT 1QUIK AG, 91 Argento 164L w/AT aka "Quik Silver 2 - ALFA 4US and 93 Rosso 164L 5-speed - ALFISTO.
Rescue projects: Organ donor 91 Nero 164L w/AT and 91 "Old Blue" 164L w/AT
"A day without an Alfa whine is like a day without sunshine"
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #3 (permalink)  
Old 10-12-2007, 04:18 PM
FR Wilk's Avatar
FR Wilk FR Wilk is offline
Registered User
  
Join Date: Oct 2007
Posts: 5
Quote:
Originally Posted by FR Wilk View Post
ML4.1 What formula do you use for calculating ignition advance?

FR Wilk
Alpa? You still around?

Porsche 944S/944S2 with M2.1 using a 60-2 timing wheel uses the following formula to calculate ignition advance. The 23 is a offset which allows negative ignition advance numbers.

= 0.75º X (HEX2DEC(hex#)-23)

My question is does this apply to just Porsche? The Alfa could be calibrated differently.
__________________
FR Wilk
[url]www.frwilk.com[/url]
[url]www.motronic-editor.com[/url]
[url]www.PowerPROM.info[/url]
[url]www.motronic.ws[/url]
[url]www.the944.com[/url]
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #4 (permalink)  
Old 10-15-2007, 03:00 AM
alpa alpa is offline
Registered User
  
Join Date: May 2006
Posts: 30
Hi,

It's the same except the constant (23) could be different.
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #5 (permalink)  
Old 10-15-2007, 06:37 AM
FR Wilk's Avatar
FR Wilk FR Wilk is offline
Registered User
  
Join Date: Oct 2007
Posts: 5
Thanks Alpa. Any estimate at what it might be? Does Alfa spec the ignition advance at idle like Porsche does? Anyone?
__________________
FR Wilk
[url]www.frwilk.com[/url]
[url]www.motronic-editor.com[/url]
[url]www.PowerPROM.info[/url]
[url]www.motronic.ws[/url]
[url]www.the944.com[/url]
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #6 (permalink)  
Old 10-15-2007, 07:01 AM
alpa alpa is offline
Registered User
  
Join Date: May 2006
Posts: 30
Quote:
Originally Posted by FR Wilk View Post
Thanks Alpa. Any estimate at what it might be? Does Alfa spec the ignition advance at idle like Porsche does? Anyone?
Ok, I'll have a look at 1.6/1.8 carb engines. Then you could compare them with 1.6/1.8 injection tables. Twin Spark (the 2L TS) is a different design, must require less advance (like 3.6 against 3.2).
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #7 (permalink)  
Old 10-16-2007, 02:34 AM
FR Wilk's Avatar
FR Wilk FR Wilk is offline
Registered User
  
Join Date: Oct 2007
Posts: 5
Quote:
Originally Posted by FR Wilk View Post
Alpa? You still around?

Porsche 944S/944S2 with M2.1 using a 60-2 timing wheel uses the following formula to calculate ignition advance. The 23 is a offset which allows negative ignition advance numbers.

= 0.75º X (HEX2DEC(hex#)-23)

My question is does this apply to just Porsche? The Alfa could be calibrated differently.
I had the parentheses wrong. I was corrected on another list. Either formula below works.

=0.75º X [HEX2DEC(hex#) -30] :Offset as a decimal number
=0.75º X (HEX2DEC(hex#) - 22.5º :Offset in degrees
__________________
FR Wilk
[url]www.frwilk.com[/url]
[url]www.motronic-editor.com[/url]
[url]www.PowerPROM.info[/url]
[url]www.motronic.ws[/url]
[url]www.the944.com[/url]
Last edited by FR Wilk; 10-16-2007 at 02:39 AM.
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Reply

« Previous Thread | Next Thread »
Thread Tools
Display Modes
Linear Mode Linear Mode

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



AlfaBB Blog Articles

Advertisement

Contact Us - Alfa Romeo Bulletin Board & Forums - Archive - Privacy Statement - Top

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2009, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.0.0
Copyright 2002-2008 AlfaBB.com All Rights Reserved.


An exclusive design by: Forumskin.com