jetronic M1 vs motronic M1 - Alfa Romeo Bulletin Board & Forums

 1Likes
  • 1 Post By Gubi
 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 10-01-2016, 02:26 PM Thread Starter
Registered User
 
Join Date: Feb 2006
Posts: 677
Smile jetronic M1 vs motronic M1

could any one give me a short explanation of the difference between the jetronic M1 as on the 3.0 verde of 88' and the next step up motronic 3.0 verde of 89'? thanks in advance for any info.
cowfy is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 10-01-2016, 08:52 PM
But Mad North-Northwest
Platinum Subscriber
 
Gubi's Avatar
 
Join Date: Sep 2003
Location: SF Bay Area, CA
Posts: 8,491
Off the top of my head the Motronic would have probably had:

- Digital fuel map in the ECU (vs. analog L-Jet)
- Digital timing advance map in the ECU (vs. the L-Jet ignition module)
- Active idle control (replaced AAV)
- Cold start enrichment via ECU (replaced CSI)
- Self-diagnostic capability (check engine light probably wasn't implemented on the Euro cars, but likely there was an OBD1 diagnostic port)
cowfy likes this.

Tom

1991 Spider
1963 Giulia Spider (1750 engine)
Gubi is online now  
post #3 of 7 (permalink) Old 10-06-2016, 04:55 AM Thread Starter
Registered User
 
Join Date: Feb 2006
Posts: 677
i see you have a 91 spider gubi.that should have the obd1 port??
cowfy is offline  
 
post #4 of 7 (permalink) Old 10-06-2016, 08:02 AM
But Mad North-Northwest
Platinum Subscriber
 
Gubi's Avatar
 
Join Date: Sep 2003
Location: SF Bay Area, CA
Posts: 8,491
No, the US S4 cars flash out codes using the check engine light. There's a button behind the passenger seat that activates this. I don't think the Euro cars had this, though, and may have just had a diagnostic port. But I could be wrong.

Tom

1991 Spider
1963 Giulia Spider (1750 engine)
Gubi is online now  
post #5 of 7 (permalink) Old 10-07-2016, 08:28 AM
Registered User
 
kredden's Avatar
 
Join Date: Jul 2003
Location: Newcastle, WA
Posts: 3,248
Verde's (and all other Milano's) only had L-Jet, no Motronic. The Motronic was used on the 164's and later Spiders.

Kevin

Currently Alfaless. Ex: 87 Verde, 86 GTV6, 67 Super, 86 Spider, 88 LeMons Verde
Milano registry custodian(
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
)
kredden is offline  
post #6 of 7 (permalink) Old 10-07-2016, 09:35 AM
But Mad North-Northwest
Platinum Subscriber
 
Gubi's Avatar
 
Join Date: Sep 2003
Location: SF Bay Area, CA
Posts: 8,491
The later 75 3.0 got Motronic in Europe, which is where I am assuming Cowfy is given the question.

Tom

1991 Spider
1963 Giulia Spider (1750 engine)
Gubi is online now  
post #7 of 7 (permalink) Old 10-08-2016, 01:50 AM
Duk
Registered User
 
Duk's Avatar
 
Join Date: Aug 2007
Location: South Australia
Posts: 1,712
Garage
I wouldn't go putting the Alfa spec version of the Motronic on any sort of pedistal. They must have used the cheapest, most whittled down version of the Motronic known to Germans.

They still squirted all of the injectors together.
They still used ye-olde throttle position switch.
They maintained the use of the vane/flap type air flow meter.
And they still had a single coil, distributor based ignition system.

In my opinion, if you aspire to get some decent results from an Alfa engine, especially the V6 engines, then you need to go with either a suitably tuned later/better version of the Motronic or simply a decent after market programmable computer that is based on crank angle sensor engine positioning to atleast squirt the injectors in pairs.

Slowly Progressing Vortech Supercharged 1990 Alfa Romeo 75 Potenziata. Out of Action Twin-Charged 1988 AW11 MR2. Current Daily Driver, The Glorified Taxi 2006 BF FPV F6 Typhoon.
Duk is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Alfa Romeo Bulletin Board & Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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

 
For the best viewing experience please update your browser to Google Chrome