Power Hungry Performance Forum  

Go Back   Power Hungry Performance Forum > Power Hungry Performance Product Information > Minotaur Automotive Tuning Software

Minotaur Automotive Tuning Software Tune your own 7.3L Diesel! If you have a question or comment about Minotaur? Post it here.

Also, check out our Facebook group: Facebook - Minotaur Tuners

Reply
 
Thread Tools Display Modes
  #1  
Old Wed, May 12th, 2010, 01:07 PM
cowboy_dan's Avatar
cowboy_dan cowboy_dan is offline
Whopper
 
Join Date: Sep 2009
Location: Racine, wi
Posts: 13
cowboy_dan is on a distinguished road
Default MFD clarification

First off, I don't have Minotaur, but am considering it. In the mean time, I'm trying to learn.

I understand the basic fuel rate unit is known as MFD.
And, the graph:

http://i641.photobucket.com/albums/u...TowingMFD2.jpg

indicates to me that this is not an actual number, but rather a percentage.

Now, for the fun part: What is it a percentage of? A fixed value, a value that changes with RPM only, a value that changes with RPM and MAP?

Like I said, I don't know nuthin', so I'm just learning.
Reply With Quote
  #2  
Old Wed, May 12th, 2010, 10:10 PM
soutthpaw's Avatar
soutthpaw soutthpaw is offline
TIT (Tuner In Training)
 
Join Date: Mar 2009
Location: Fountain, CO
Posts: 503
soutthpaw has a spectacular aura aboutsoutthpaw has a spectacular aura aboutsoutthpaw has a spectacular aura about
Default

MFD is in Milligrams per stroke.. its not a percentage. but it is a Desired which means it not always what you are really getting as several factors affect the actual fuel delivered.
The Map itself in using Accelerator pedal position 0-1024 A/D counts and engine RPM to the the MG/Stroke value...

You will find that there are many values that cannot be set directly because there are many other maps and parameters that alter the individual map..
Start of Injection (SOI) is probably the best example of that.... just cuz u set a SOI at a specific point, you will rarely actually get that SOI
__________________
DJ Phoenix (my modded) Hi-1200/240Tow/75FS/80DD/100/140SS +Minotaur
ASE Master Auto Technician
2001 Ford Excursion 7.3 4x4
Projects. 1970's Hustler and Max II Amphibious ATV's
Reply With Quote
  #3  
Old Thu, May 13th, 2010, 07:31 AM
cowboy_dan's Avatar
cowboy_dan cowboy_dan is offline
Whopper
 
Join Date: Sep 2009
Location: Racine, wi
Posts: 13
cowboy_dan is on a distinguished road
Default

Ok, so that value that corresponds to a pedal position of 100% is a fixed value, which can be modified (I assume) in the Minotaur.
Reply With Quote
  #4  
Old Thu, May 13th, 2010, 08:55 AM
Pocket Pocket is offline
Bacon King
 
Join Date: Oct 2009
Location: Parker, CO
Posts: 97
Pocket is on a distinguished road
Default

Quote:
Originally Posted by cowboy_dan View Post
Ok, so that value that corresponds to a pedal position of 100% is a fixed value, which can be modified (I assume) in the Minotaur.
If you mean the fixed position of 1023 A/D counts, yes that's 100% pedal position. The resolution of the pedal position in A/D counts can be changed. That image is exactly that, a table that Cody modified to have more resolution for pedal input.

After he shared that tidbit in the other thread, I tried it out on my truck. The result of it was a much smoother pedal that wasn't super touchy. I really like the MFD map like this much more than stock.
Reply With Quote
  #5  
Old Thu, May 13th, 2010, 10:22 AM
cleatus12r's Avatar
cleatus12r cleatus12r is offline
F Your Yankee Blue Jeans
 
Join Date: Jan 2009
Location: Somewhere in Montana
Posts: 3,063
cleatus12r is a name known to allcleatus12r is a name known to allcleatus12r is a name known to allcleatus12r is a name known to allcleatus12r is a name known to allcleatus12r is a name known to all
Default

Just for your information:

A/D counts are a more precise way of measuring the 0-5 volt input to the PCM from the Accelerator Pedal Position (APP) sensor. There are 204 A/D counts per volt of input.

Keep in mind that the APP sensor DOES NOT put out 0 volts, nor does it go all the way to 5 volts. This means that you will never get 0 A/D counts or a full 1023 A/D counts. More like 100 to 918 A/D counts.

For those of you who have this "updated" MFD scale, you might want to take this into account on your MFD map.
__________________
Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
Reply With Quote
  #6  
Old Thu, May 13th, 2010, 12:49 PM
cowboy_dan's Avatar
cowboy_dan cowboy_dan is offline
Whopper
 
Join Date: Sep 2009
Location: Racine, wi
Posts: 13
cowboy_dan is on a distinguished road
Default

Quote:
Originally Posted by Pocket View Post
If you mean the fixed position of 1023 A/D counts, yes that's 100% pedal position. The resolution of the pedal position in A/D counts can be changed. That image is exactly that, a table that Cody modified to have more resolution for pedal input.

After he shared that tidbit in the other thread, I tried it out on my truck. The result of it was a much smoother pedal that wasn't super touchy. I really like the MFD map like this much more than stock.
Actually, what I said was
Quote:
that value that corresponds to a pedal position of 100% is a fixed value
and what I meant was
Quote:
that MFD value (in mg/stroke) that corresponds to a pedal position of 100% is a fixed value
In other words, the number (in mg/stroke) that is multiplied by the pedal % is a fixed number for a given calibration/tune. The number does not change with rpm, load, boost, or any other variable.
Reply With Quote
  #7  
Old Thu, May 13th, 2010, 12:54 PM
cowboy_dan's Avatar
cowboy_dan cowboy_dan is offline
Whopper
 
Join Date: Sep 2009
Location: Racine, wi
Posts: 13
cowboy_dan is on a distinguished road
Default

Quote:
Originally Posted by cleatus12r View Post
Just for your information:

A/D counts are a more precise way of measuring the 0-5 volt input to the PCM from the Accelerator Pedal Position (APP) sensor. There are 204 A/D counts per volt of input.

Keep in mind that the APP sensor DOES NOT put out 0 volts, nor does it go all the way to 5 volts. This means that you will never get 0 A/D counts or a full 1023 A/D counts. More like 100 to 918 A/D counts.

For those of you who have this "updated" MFD scale, you might want to take this into account on your MFD map.
Yup. Keeping the operating range from swinging to either of the voltage rails also allows for diagnostic capabilities. 5v systems are usually 0.5-4.5v operating range. Any signal voltage less than 0.5v is considered shorted to low source (ground), and anything over 4.5 volts is considered shorted to high source (5v or 12v).
Another benefit is that the A/D is usually most accurate in the middle of the range. So by taking either end of the range out of the usable system, the overall accuracy of the operating range is increased slightly.
Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -5. The time now is 06:39 AM.


All Contents Copyright 2008-2020, Power Hungry Performance