Dataloggers, fuel pump voltage spike at start up?
#1
Dataloggers, fuel pump voltage spike at start up?
I get a spike in actual fuel pump voltage during cranking. It shoots up to 25 volts!
Is that even possible?
It does it regardless of tune, but not always. Has anyone ever recorded this anomaly? Maybe it's just a glitch in the sct software.
Is that even possible?
It does it regardless of tune, but not always. Has anyone ever recorded this anomaly? Maybe it's just a glitch in the sct software.
#3
I'm not sure. I don't read the abbreviations off the handheld. I'm looking at them in livelink. They are still abbreviated in live link, but not as bad.
Get a PC! I hate my parents apple laptop, it's such a PITA to use. I do like my ipod touch though.
vpwr is probably vehicle power, but I'm not sure if that's guesstimated horsepower or what. VSPD is vehicle speed, pps is pedal position, KSSPK+ is the knock sensor spark adder array, this is what you log to see if the knock sensors are pulling spark.
Get a PC! I hate my parents apple laptop, it's such a PITA to use. I do like my ipod touch though.
vpwr is probably vehicle power, but I'm not sure if that's guesstimated horsepower or what. VSPD is vehicle speed, pps is pedal position, KSSPK+ is the knock sensor spark adder array, this is what you log to see if the knock sensors are pulling spark.
Last edited by moosestang; 10-24-2012 at 06:38 PM.
#5
it only happens during cranking, so it's definitely related to start up only. It may be perfectly normal too. My thinking is it's associated with the dual gt500 pumps and they way they are wired, but it should do it every time. Here's a pic of the spike.
#7
that's my theory. I'm not sure where it pulls the reading from, but the gt500 pumps have a separate power wire, plus the stock wiring. The spike is right when I turn the key to run. You can see the crank sensor isn't even registering rpms yet.
#8
Easy way to find out. Go unplug the driver from one of the pumps and start it up.
#9
May have spoke to soon. Looking at old datalogs, my fuel pressure drop across the injectors does fluctuate between 36-42ish at part throttle. I'll have to do some more data logging.
Last edited by moosestang; 11-05-2012 at 07:47 PM.