Mapping - MVAgusta.net
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 17 (permalink) Old 10-23-2006, 10:42 AM Thread Starter
Senior Member
 
Street Fighter's Avatar
 
Join Date: Sep 2006
Posts: 350
Mapping

Can anybody explane mapping. What is mapping, How do you map,Etc. Im an old school guy with a brutale 910
Street Fighter is offline  
Sponsored Links
Advertisement
 
post #2 of 17 (permalink) Old 10-23-2006, 11:13 AM
 
Join Date: Sep 2006
Posts: 503
The concept is fairly simple but not so easy to explain. I'll take a stab at it.

For an internal combustion engine to operate properly, it needs fuel and air in the correct proportions (air/fuel ratio). There's a theoretical ideal of ~14.7:1 called the stoichiometric ratio. This theoretically will allow each hydrocarbon molecule in the fuel to mate with an oxygen molecule and combust. Less air than stoichiometric is considered rich (i.e. excess fuel), more air is considered lean (i.e. excess oxygen).

Fuel injected engines control the amount of fuel entering the engine by varying the amount of time the injector nozzle (pintle) is held open (injection duration). Calculation are made based on throttle opening, engine RPM, temperature, barometric pressure and possibly other variables.

If we visualize this as a spreadsheet with throttle opening on one axis and rpm (for example - the other variables are also present) we can input a value where each cell intersects. This value represents injector opening duration. In essence, this is our "map". Throttle opening of "X" with RPM of "Y" equals injector opening duration.

Remapping is simply making an adjustment to these values. Most maps will show throttle opening in percentage such as 0, 2, 5, 10, 20, 40, 60, 80, 100. It is important to understand that the digital information we are creating in our spreadsheet "map" is really translated into an analog graph. in other words, changing a value at 60% throttle will affect the entire 40 to 80 percent range.

I hope this helps.
Koop is offline  
post #3 of 17 (permalink) Old 10-23-2006, 11:43 AM
 
Join Date: Sep 2006
Posts: 503
I didn't delve into ignition mapping, but is the same idea. Find the ideal ignition timing point based on load factor. Load factor is a calculation of the same variables used to calculate injection duration.
Koop is offline  
Sponsored Links
Advertisement
 
post #4 of 17 (permalink) Old 10-23-2006, 12:41 PM
Senior Member
 
mikef4uk's Avatar
 
Join Date: Feb 2006
Location: Chester UK
Posts: 5,193
Mapping is quite simple in theory, not so in real life

The ecu reads all the engines inputs: rpm/air temp/water temp/air pressure/throttle opening, then cross references them to a fuel and ignition table within the ecu, (the map, or to alter the table would be "mapping the engine") it then says, or outputs "Right,I have looked at the "maps" and your having this much fuel per engine revolution (measured in milliseconds), and the spark here (measured in degrees)"

Easy eh?

(This reply has not been checked for punctuation, grammar, or spelling mistakes and is devoid of any big long cleverwords or condescending manner)


MV's all gone now, still have a soft spot for MV's, waiting for MV to tick all my boxes again.
Previously (and about 40 others)748SP, S4, S4R, 98R1, 2000 F4, F41000S, F41000R, 08R1, 09R1, S1000RR, RSV4 Factory aPRC in Garage now
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
mikef4uk is offline  
post #5 of 17 (permalink) Old 10-23-2006, 08:49 PM Thread Starter
Senior Member
 
Street Fighter's Avatar
 
Join Date: Sep 2006
Posts: 350
Thanks that helps. Now who does remapping in southern calif. And knows what there doing. Also about the dyno in my experince a dyno only tells how how much hourspower a motor makes is this true or does it also help in mapping, tuning, airfuel ratio, etc.
Street Fighter is offline  
post #6 of 17 (permalink) Old 10-23-2006, 10:14 PM Thread Starter
Senior Member
 
Street Fighter's Avatar
 
Join Date: Sep 2006
Posts: 350
How is mapping done. Is it done to the Eprom or is there a computer that its done to.What does a lap top hook up to???????????????
Street Fighter is offline  
post #7 of 17 (permalink) Old 10-23-2006, 10:19 PM
 
Join Date: Sep 2006
Posts: 503
The map is contained in the EPROM. IMHO, a dyno is a necessity to get it right. For reasons that would result in a long winded post, it isn't possible to just attain a stoichiometric ratio and call it good. In fact, a stoichiometric ratio throughout the load range would result in burned pistons. By using a dyno the operator can see the results as tweaks to the map are made. Having said that, there are tuners out there with enough experience to tweak without a dyno, but unless you have much experience wiith the bike in question you're shooting in the dark.
Koop is offline  
post #8 of 17 (permalink) Old 10-23-2006, 10:20 PM Thread Starter
Senior Member
 
Street Fighter's Avatar
 
Join Date: Sep 2006
Posts: 350
More Info On mapping a 910

How is mapping done. It is done to the Eprom or is there a computer on the bike. Where and what does a laptop hook up to.
Street Fighter is offline  
post #9 of 17 (permalink) Old 10-23-2006, 10:31 PM
 
Join Date: Sep 2006
Posts: 503
It can be done a few different ways. The most familiar is the Power Commander which connects into the Engine Control Module harness. The Power Commander alters the output from the ECM by changing the input values from various sensors.

Another method is to burn a new EPROM and replace the existing one on the board inside the ECM.

If you have the proper equipment, you can access the EPROM through the diagnostic port and re-write it.

All of these methods are proven to work, it is a matter of preference (and availability).
Koop is offline  
post #10 of 17 (permalink) Old 10-23-2006, 10:44 PM Thread Starter
Senior Member
 
Street Fighter's Avatar
 
Join Date: Sep 2006
Posts: 350
Thanks. whitch one is the best avalibility. And where can you order eprom
Street Fighter is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to use all of the features of the MVAgusta.net site, 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










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
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 On
Pingbacks are On
Refbacks are On

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