|04-21-2004, 12:48 AM||#1|
Join Date: Apr 2003
Location: Melbourne, AustraliaVehicle:
Experience with stock MAP sensor?
I got the part number off the stock MAP sensor, and found the datasheet for the part (www.datasheetarchive.com is a very handy site). I've posted the relavent bits here
What I'm wondering is, does the sensor really do what it shows in the datasheet, i.e. the output flattens after about 4.7 volts (~17.7PSI). If that were really true, then people wouldn't be needing 4.7V zeners or other clamps to prevent high MAP pressure CELs, right? Maybe the datasheet just shows the guaranteed linear section or something like that?
Has anyone seen what the stock sensor does in real life at higher pressure?
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|04-21-2004, 01:34 AM||#2|
Join Date: Feb 2000
Location: Schaumburg, ILVehicle:
16 WRX (white)
04 FXT (red)
From what I've heard, the output above 4.7-4.8v is very erratic as it's the very end of the ability of the sensor. I don't think it just flattens out as pretty much everyone has proven that it does go above that certain voltage (by needing to use voltage clamps).
|04-22-2004, 08:06 AM||#3|
Join Date: Dec 1999
Location: Lebanon, NH, USAVehicle:
2005 Outback 2.5 XT
Champagne Gold Opal
Re: Experience with stock MAP sensor?
Also, the graph is a generalization of the MAP sensor response curve. Although actual sensors have guaranteed response for linearity and accuracy in the P1-P2 range, nothing is guaranteed beyond those specified limits of operation. Subaru took care of this by implementing a voltage limit interlock (there's probably a CEL if the voltage went below ~0.3V too).
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