LM-1 Issue
LM-1 Issue
Can someone tell me how to tap the rpm into the rpm converter for the LM-1? I tapped it directly from an ecu wire and checked logworks for 0...10320 or something like that and my RPM readings are way off. At 800rpms i get about 1200rpms... Anyone know whats wrong?
Evolving Member
Joined: Dec 2006
Posts: 276
Likes: 0
Programming LogWorks (the logging software) and programming the RPM converter are two different things.
Since the RPM adapter can take measurements from ignition systems as well as crank angle sensors, the RPM converter needs to be configured for the correct cyl count and strokes (basically how many pulses per RPM and does it need to ignore things like waste sparks). This is done with the LM Programmer utility (per the instructions that came with the RPM converter).
When you configure the channel in LogWorks, you are only controlling how LogWorks displays and interprets the 0-5V data from the LM-1/LMA-3. You are saying "0V=0 RPM, 5V=10230 RPM". This is the default range for the LM-1 RPM input (it is 10230 because the LM-1 puts out 10 bit samples. A 10 bit sample counts from 0-1023, using the range of 0-10230 means that each sample step represents a nice round 10 RPM - however, this is only the default, many of our products can be configured for custom RPM ranges).
So, you have told LogWorks how to *display* 0-5 as RPM, but you have not told the RPM converter how to interpret the pulses it is receiving so that 0V=0 RPM and 5V=10230. Once you have done so, it should be quite accurate.
If you have any difficulty understanding how to setup your unit, you can always call us and someone here would be glad to walk you through it.
-jjf
Since the RPM adapter can take measurements from ignition systems as well as crank angle sensors, the RPM converter needs to be configured for the correct cyl count and strokes (basically how many pulses per RPM and does it need to ignore things like waste sparks). This is done with the LM Programmer utility (per the instructions that came with the RPM converter).
When you configure the channel in LogWorks, you are only controlling how LogWorks displays and interprets the 0-5V data from the LM-1/LMA-3. You are saying "0V=0 RPM, 5V=10230 RPM". This is the default range for the LM-1 RPM input (it is 10230 because the LM-1 puts out 10 bit samples. A 10 bit sample counts from 0-1023, using the range of 0-10230 means that each sample step represents a nice round 10 RPM - however, this is only the default, many of our products can be configured for custom RPM ranges).
So, you have told LogWorks how to *display* 0-5 as RPM, but you have not told the RPM converter how to interpret the pulses it is receiving so that 0V=0 RPM and 5V=10230. Once you have done so, it should be quite accurate.
If you have any difficulty understanding how to setup your unit, you can always call us and someone here would be glad to walk you through it.
-jjf
Last edited by jfitzpat; Jan 31, 2007 at 08:50 PM.
1. Connect the wire that gets the signal from the ECU to the rpm converter slot that says
2. Connect the a ground wire from the rpm converter to a ground on the car.
3. Start your car
4. Let it warn up until the idle is at normal temp.
5. Make sure the red button on the LMA-2 is on.
6. Hold the rpm to 2000 rpm.
7. Press the re-set button (white button) on the LMA-2
8. The red light will flash
9. keep the rpm @ 2000 rpm while the red light is flashing.
10. When the red light stops flashing, lift the gas pedal to end the 2000 rpm session.
Your rpm converter should be programmed accurately. Follow Joe's instruction on how to program Logworks to read the signal from the LMA-2
Thread
Thread Starter
Forum
Replies
Last Post
