Go Back  HomemadeTurbo - DIY Turbo Forum > Homemadeturbo > Engine Management
Analog Values from RPM and Map sensor. HW Datalogger completed, now software >

Analog Values from RPM and Map sensor. HW Datalogger completed, now software

Engine Management eCtune , Crome , AFC , FMU , Zdyne , Hondata , EMS , TE , Uberdata Anything to control your fuel, spark needs!

Analog Values from RPM and Map sensor. HW Datalogger completed, now software

Old 01-08-2004, 09:48 AM
  #1  
3.0 BAR
Thread Starter
 
Join Date: Jan 2003
Posts: 1,798
Default Analog Values from RPM and Map sensor. HW Datalogger completed, now software

I've just completed my datalogger. It logs rpm,map and wideband to the serial port (rs232). Now I'm working on converting the values from values given from the rpm analog signal to the actual rpm value, same thing for the map. The wideband values are give on the techedge website. I know I have seen the map analog values awhile back but I dont remeber where.
thanks for the help,
Nick

Sinner is offline  
Old 01-09-2004, 09:42 AM
  #2  
3.0 BAR
 
Join Date: Jul 2003
Posts: 6,449
Default Re:Analog Values from RPM and Map sensor. HW Datalogger completed, now software

Sinner,

I have created a little utility in Excel/VBA to help me with my tuning from my datalogs of my LM-1 WB.

Contact me via email([email protected]) or AIM (xenocron1) as I think we can help each other out.

I am also trying to find out the exact values of the MAP voltage and what Vacuum/Boost pressures they equate to...is this not definitively published somewhere?
Chris Harris is offline  
Old 01-09-2004, 09:45 AM
  #3  
3.0 BAR
 
Join Date: Apr 2003
Posts: 2,260
Default Re:Analog Values from RPM and Map sensor. HW Datalogger completed, now software

I think there are published values for 3bar.. I'm not sure anyone has taken the time to do stock MAP sensor values as the popular commercial tuning software integrates WBO2 into thier datalogging, and calculates RPM vs MAP on a grid representing the current values that the ECU is reading from.. (remind you of anything. Heheheh!)
TurboEF9 is offline  
Old 01-10-2004, 07:05 AM
  #4  
3.0 BAR
 
Join Date: Jul 2003
Posts: 6,449
Default Re:Analog Values from RPM and Map sensor. HW Datalogger completed, now software

It sure does, but right I now I do NOT have that :P

What I do have is an excel sheet that reads in a log of MAP, RPMs and A/F in three columns...figures out what row & column to place the A/F ratio in and average all of the data in each cell for a well rounded number and an *idea* on which cells i need to change my settings and by how much (%) for the dual map BIN

Its pretty neat actually, and if I was sure of the voltages of the MAP sensor and if my damn RPMS would log correctly I would put out a copy for everyone to use.

I read in one of the tech2tech articles that 18 InHg = .95 volts and 0 InHg = 2.75 volts. From there I found all the points on the line(since the MAP is linear) that corresponded to the values along the top colunms of TurboEdit and found what voltage it should be. This is the most accurate I can assume I will get without actual published values.
Chris Harris is offline  
Old 01-10-2004, 10:26 AM
  #5  
3.0 BAR
 
Join Date: Apr 2003
Posts: 2,260
Default Re:Analog Values from RPM and Map sensor. HW Datalogger completed, now software

Originally Posted by xenocron
From there I found all the points on the line(since the MAP is linear) that corresponded to the values along the top colunms of TurboEdit and found what voltage it should be.
The values going across the top of TurboEDIT tables are an average of what the actual MAP pressure would be reading form that column.
TurboEF9 is offline  
Old 01-10-2004, 01:09 PM
  #6  
3.0 BAR
 
Join Date: Jul 2003
Posts: 6,449
Default Re:Analog Values from RPM and Map sensor. HW Datalogger completed, now software

So I should be roughly close correct? Good enough to aid in my tuning?
Chris Harris is offline  
Old 01-10-2004, 01:46 PM
  #7  
3.0 BAR
 
Join Date: Apr 2003
Posts: 2,260
Default Re:Analog Values from RPM and Map sensor. HW Datalogger completed, now software

No, they are perfect for what you need, right on the money.

TurboEF9 is offline  
Old 01-10-2004, 09:34 PM
  #8  
1.0 BAR
 
Join Date: Sep 2003
Posts: 453
Default Re:Analog Values from RPM and Map sensor. HW Datalogger completed, now software

Originally Posted by Sinner
I've just completed my datalogger. It logs rpm,map and wideband to the serial port (rs232). Now I'm working on converting the values from values given from the rpm analog signal to the actual rpm value, same thing for the map. The wideband values are give on the techedge website. I know I have seen the map analog values awhile back but I dont remeber where.
thanks for the help,
Nick
OK, this is a little, (waaay) of topic,but...
What is the analog value for rpm? Someone on pgmfi said it is voltage pluses or something like that. So is it not a regular rising dc voltage (like the o2) like I was assuming? I was wanting to find a way to display the rpm with leds just for fun .
Now back to your regularly scheduled thread. Please pardon me.


d16tuner is offline  
Old 01-12-2004, 08:22 AM
  #9  
3.0 BAR
 
Join Date: Jul 2003
Posts: 6,449
Default Re:Analog Values from RPM and Map sensor. HW Datalogger completed, now software

Page Visit Our Website: www.tech2tech.net
ΖΙ All Rights Reserved 2000 Sure Seal Products Inc
This manual printed 4/9/00 from the file pgmfiobd_002.
16-2

The VSS signal is used by the ECM and the cruise control unit. The signal is a
digital type signal that is either 0 volts or 5 volts (see Screen Capture 16-1). The
frequency of the VSS signal increases with the increase in vehicle speed

Chris Harris is offline  
Old 02-01-2004, 12:53 PM
  #10  
0.5 BAR
 
Join Date: Jan 2004
Posts: 55
Default Re:Analog Values from RPM and Map sensor. HW Datalogger completed, now software

vss and rpm are 2 different things.
vss = after trans
rpm = before trans.
dewme5 is offline  

Thread Tools
Search this Thread
Quick Reply: Analog Values from RPM and Map sensor. HW Datalogger completed, now software


Contact Us - Sitemap - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.