im looking for a cheap (ok, free) way to see my boost curve.. the stock boost sensor is basically a map sensor, correct? im sure it isnt accurate, and i wouldnt rely on it for datalogging actual pressure, but i dont really need that at this point.. what im interested in doing is plotting my boost pressure on a graph so i can actually see it and make adjustments on my EBC to dial out any creeping or high rpm drop off. has anyone played with this thing before? if i have some free time this weekend im gonna play with a mityvac and a multimeter and see what i can come up with. anyone have any thoughts?
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Factory boost sensor.
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What exactly are you looking for? You wanna be able to see the changes on you gauge cluster? That way you can adjust by looking at the same place as your RPM's? Hmm I guess that would depend if you have the analog or digital. Either way, you are just trying to see when it spikes or somthing? Do you not have a regular boost gauge? I guess I dont get what you are trying to do exactly. :?85 Z31 6.0 LSX turbo 766whp/792wtq
04 GTO, LS6, big cam, porting, N20... underway for summertime daily driver.
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SATAN wrote: What exactly are you looking for? You wanna be able to see the changes on you gauge cluster? That way you can adjust by looking at the same place as your RPM's? Hmm I guess that would depend if you have the analog or digital. Either way, you are just trying to see when it spikes or somthing? Do you not have a regular boost gauge? I guess I dont get what you are trying to do exactly. :?
in AFM cars a lot of people buy a MAP sensor with a known voltage-pressure scale and use that to datalog boost. im talking about seting up a simple version of this using the stock sensor for making EBC adjustments.
what im trying to ask i guess, is has anyone logged the output of the stock boost sensor. is there any reliability to it at all? is it even a 0-5 volt sensor? again, i dont expect it to be acurate like an actual MAP sensor, but is it acurate enough to give me a basic visual representation of my boost curve?
the bottom line here is im trying to make use of the adjustments on the EBC by using a better technique than simply watching the gauge while under boost.
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I have looked at several and they are very much repeatable. I do not know how accurate the guage in the dash is but the sensor does show repeatability. If its repeatable, then it can be used for accuracy if that output can be correlated to a known vacuum calibration.Try not to be a Yahoo
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Bernard posted a map of a 280zxt boost sensor that can be used with the techedge widebands. I assume most logging software that accomodates configurable inputs would accept a similar map.
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the stock boost sensor is reasonably accurate and linear.
When I made the very first edition of my digital boost gauge, two summers ago, it used the stock boost gauge. Newer versions have their own integrated boost sensor, of course.88ss, MegaSquirted.
t3/t4 60-1 cold, stage 3 hot, FMIC
450cc DSM injectors, walbro 255
http://www.z-toys.com/ Boost gauge and MS info
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It works just fine if you log it with the LM-1. I have mine setup with a voltage regulator to ensure a consistent input voltage to the sensor. I cant remember if its a 12v or 5v regulator but if you try supplying a voltage you can pick the right regulator to get a 0-5v signal for the lm-1. Once you have it wired up you will want to get a reliable boost gauge and a pressure regulated air supply. Using the gauge you will want to monitor the sensor output voltage vs. gauge psi reading to create a calibration map. Once you have that you can put it in the lm-1 software and it will log the sensor output as a psi. I would suggest making the calibration map for each sensor you use because ive had two sensors read different.
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