We're on Boost
15+ Year Contributor
- 2,113
- 852
- Aug 25, 2007
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Seattle area,
Washington
I've been wanting to log fuel pressure lately, so I started poking around on the subject about a week ago. I would be logging with my ecu+.
I found out some worthwhile info by sending an email to Prosport gauges and would like to pass it on, here it is:
Me: I want to buy an electric fuel pressure gage with a sender that puts out a signal I could log on one of the 0 to 5 volt analog inputs in my logger. Will the prosport electric fuel pressure gage sender give me a logable signal?
Prosport: You are going to have to use the premium series Fuel Pressure gauge as that has a 0-3v output signal that you can tap into.
Me: Do you mean I would tap into the green wire that goes to the sender? Or is there an actual port on the back of the gage that is made to be an analog output to a logger?
Prosport: You would have to tap into it, no normal output signal o the gauge.
Me: I can do that, no problem. Wouldnt I be able to do the same thing with the less expensive gages though, I mean the performance series gages?
Prosport: no, because that sender on the performance series reads Ohms.
Me: Ok, that makes sense. Thanks!
So there you have it, one possible way to log fuel pressure. You would prefer the input on your logger to be a high impedence input so it doesn't throw off the reading to your gauge. Logging just plain old voltage doesn't tell you what the fuel pressure is directly. So before I install the gage on the car I will set it up on the bench with a fitting to an air compressor and read the voltage at several different air pressures. That will be my "calibration" table to convert volts to pressure. The "premium" gage with sender is about a hundred bucks.
BTW what got me thinking about this is a problem with a lean condition under load ever since installing my Walbro. I'm thinking the problem is with the Walbro install. So I might just do that different to see if it "fixes" the problem. Still, I've always thought it would be nice to be able to log fuel pressure, even before this problem happened.
Would appreciate comments if anybody has tried this or done it a different way!
Gary
I found out some worthwhile info by sending an email to Prosport gauges and would like to pass it on, here it is:
Me: I want to buy an electric fuel pressure gage with a sender that puts out a signal I could log on one of the 0 to 5 volt analog inputs in my logger. Will the prosport electric fuel pressure gage sender give me a logable signal?
Prosport: You are going to have to use the premium series Fuel Pressure gauge as that has a 0-3v output signal that you can tap into.
Me: Do you mean I would tap into the green wire that goes to the sender? Or is there an actual port on the back of the gage that is made to be an analog output to a logger?
Prosport: You would have to tap into it, no normal output signal o the gauge.
Me: I can do that, no problem. Wouldnt I be able to do the same thing with the less expensive gages though, I mean the performance series gages?
Prosport: no, because that sender on the performance series reads Ohms.
Me: Ok, that makes sense. Thanks!
So there you have it, one possible way to log fuel pressure. You would prefer the input on your logger to be a high impedence input so it doesn't throw off the reading to your gauge. Logging just plain old voltage doesn't tell you what the fuel pressure is directly. So before I install the gage on the car I will set it up on the bench with a fitting to an air compressor and read the voltage at several different air pressures. That will be my "calibration" table to convert volts to pressure. The "premium" gage with sender is about a hundred bucks.
BTW what got me thinking about this is a problem with a lean condition under load ever since installing my Walbro. I'm thinking the problem is with the Walbro install. So I might just do that different to see if it "fixes" the problem. Still, I've always thought it would be nice to be able to log fuel pressure, even before this problem happened.
Would appreciate comments if anybody has tried this or done it a different way!
Gary