KLR output to Boost gauge
#1
Former Vendor
Thread Starter
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Does anyone know the calibration of KLR pin #5 output voltage, ie. signal to instrument cluster boost gauge?
Is it linear or not, and how many Volts are eg. -0.6, 0 and 1.0bar? ( 0.4, 1.0 and 2.0 according to gauge )
TIA, Pete
Is it linear or not, and how many Volts are eg. -0.6, 0 and 1.0bar? ( 0.4, 1.0 and 2.0 according to gauge )
TIA, Pete
Last edited by pete95zhn; 11-24-2006 at 09:24 AM.
#4
Rennlist Member
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As far as I can tell, it is a pulse width output with very low voltages. I posted my findings here I believe. I started to make a circuit to remap the factory gauge on a 0-30psi scale, but haven't gotten back to it in a while. The pressure sensor in the KLR didn't have the needed range, so I was planning to re-condition the signal from my zeitronix boost sensor to drive the gauge.
#5
Former Vendor
Thread Starter
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Thanks, I did some searching and there's general consensus that it a PWM signal. What's missing is amplitude, pulse width and frequency.
It would be pretty easy to do testing if there just were oscilloscope and hand held boost/vacuum pump available.
It would be pretty easy to do testing if there just were oscilloscope and hand held boost/vacuum pump available.
#6
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Originally Posted by pete95zhn
Does anyone know the calibration of KLR pin #5 output voltage, ie. signal to instrument cluster boost gauge?
It is taken on the KLR board before the internal calibration stage, so you must handle the calibration by yourself.
Sorry to disturb the general consensus...
![Frown](https://rennlist.com/forums/images/smilies/frown.gif)
#7
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Originally Posted by Transaxle
Depends on where you take the signal. It is taken directly from the sensor and just filtered. If you take it from #5, you will see a linear signal with a 0-5V range. With the boost gauge connected, the signal is divided by 5 to give you a 0-1V signal.
It is taken on the KLR board before the internal calibration stage, so you must handle the calibration by yourself.
Sorry to disturb the general consensus...![Frown](https://rennlist.com/forums/images/smilies/frown.gif)
It is taken on the KLR board before the internal calibration stage, so you must handle the calibration by yourself.
Sorry to disturb the general consensus...
![Frown](https://rennlist.com/forums/images/smilies/frown.gif)
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#8
Former Vendor
Thread Starter
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Thanks Transaxle,
just few thing for clarification:
- the boost gauge itself is fed with linear 0-5v signal, yes or no...?
- as Tom asked, is 0V = 0bar and 5V = 2bar ?
If these both apply, it would be fairly easy to recalibrate boost gauge to show 0-2 bar boost, and get this signal from stand-alone EMS.
just few thing for clarification:
- the boost gauge itself is fed with linear 0-5v signal, yes or no...?
- as Tom asked, is 0V = 0bar and 5V = 2bar ?
If these both apply, it would be fairly easy to recalibrate boost gauge to show 0-2 bar boost, and get this signal from stand-alone EMS.
#9
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This is a chart of my datalogger for the boost signal. The range is set to 5 volts so:
100%=5 Volts
20%=1 Volt
Sample rate was set a 20 samples/second
Assume 1 Volt =14.7PSI (1 bar)
I had the boost set at 18 PSI since it was a nice cool day at Mid-Ohio. The reading on the chart were around 42% or 18PSI.
100%=5 Volts
20%=1 Volt
Sample rate was set a 20 samples/second
Assume 1 Volt =14.7PSI (1 bar)
I had the boost set at 18 PSI since it was a nice cool day at Mid-Ohio. The reading on the chart were around 42% or 18PSI.
Last edited by Bri Bro; 12-10-2006 at 07:29 PM.