How to Microsquirt fuel and spark your LSX swap (sloppy mechanics how to!) 8-10-13
#24
#25
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Keep in mind resolution amounts of Bar, or 100 Kpa, can be different between two map sensors. Oem style map sensors on most cars only read 1 bar (vacuum), wheres most aftermarket pieces can read 2.5 bar (255~kpa), like in Megasquirt 1 built in to the pcm, or most aftermarket pieces intended for boost are 3 bar. So it will see 1 bar of vacuum, (non boost), and 2 bars of boost .. or roughly 200kpa, 29psi~
So, this chart starts AFTER the initial 100 kpa, so add 100 kpa to the values above for the boost level. Confused yet?
#27
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![](http://farm6.staticflickr.com/5191/8411099303_fac633355f.jpg)
Keep in mind resolution amounts of Bar, or 100 Kpa, can be different between two map sensors. Oem style map sensors on most cars only read 1 bar (vacuum), wheres most aftermarket pieces can read 2.5 bar (255~kpa), like in Megasquirt 1 built in to the pcm, or most aftermarket pieces intended for boost are 3 bar. So it will see 1 bar of vacuum, (non boost), and 2 bars of boost .. or roughly 200kpa, 29psi~
So, this chart starts AFTER the initial 100 kpa, so add 100 kpa to the values above for the boost level. Confused yet?
Does the sensor read in absolute?
Doug
EDIT - DUH!!! Big double DUHHH!! I answered my own question - MAP - Manifold Absolute Pressure! Off day today.
Last edited by douglee25; 01-24-2013 at 03:41 PM.
#30
#33
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Quote:
DIYAutoTune.com Not really. The main problem is that tuning in absolute PSI is going to look almost as odd as kPa, and the ECU doesn't think in relative pressure like a boost gauge.
I have to ask how does the ecu not think in relative pressure? it reads 0-5 volts from a map sensor, it puts a value to a voltage. 2volts = 200kpa or 2 volts=7psi . I don't see what the difference is here. All that ecu should care about is what the input voltage is. What am I missing some thing here ?
DIYAutoTune.com Not really. The main problem is that tuning in absolute PSI is going to look almost as odd as kPa, and the ECU doesn't think in relative pressure like a boost gauge.
I have to ask how does the ecu not think in relative pressure? it reads 0-5 volts from a map sensor, it puts a value to a voltage. 2volts = 200kpa or 2 volts=7psi . I don't see what the difference is here. All that ecu should care about is what the input voltage is. What am I missing some thing here ?
#38
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I just got it installed on my junky four door Fairmont. easiest install I ever done even easier than ms1 and msd 6010. We'll be firing up the junkyard 6.0 with 80mm hopefully next week.