Club G40 Forum
Club G40 => General Car Chat => Topic started by: poloeatonm45 on December 10, 2008, 08:58:00 pm
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will i need a different chip fitting to allow me to run this {boost pressure sensor '250 kPa' (1,5 Bar) or will the 19 percent smaller pully psd eaton chip run this ?
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you'll need a map specifically to suit the 250kpa sensor.
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god dam i just bought that chip too grrrrrrrrrr thanks for the info mate
steven
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you'll need a map specifically to suit the 250kpa sensor.
Are you sure?? I didnt think that was the case...
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ummmmmm im not sure either i would of thought i would have to get a re map although i suppose the chip is already mapped to accept the higher boost levels of the 19% smaller pully but will it be able and does it need to read from the map sensor?? im not good at this side of things, we can strip and brebuild engines but we only have a basic knowlage of the electric side of things
anyone know for sure if i need a new re map or will my chip be fine??
steven
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the output voltage of the map sensor ranges from 0 to 5 volts regardless of it's pressure input range. So the map needs altering to reflect the new range.
E.G. at say 1 bar boost, the 250kpa sensor will be giving an output of about 3.7 volts but at the same boost the original (I tihnk 200kpa) sensor will be reading close to full 5 volts. Same boost level, totally different voltage reading. Without changing the map the ECU will constantly think there is less boost pressure than there really is so fuelling will be incorrect (perhaps dangerously so!).
The map sensor is just a variable resistor which gives less resistance the higher the air pressure it sees.
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Hayesey is correct.
The fuel and ignition maps are rpm vs load (MAP) tables, whilst the rpm scale has seperate calibratable setpoints, the MAP scale simply corresponds to a MAP sensor voltage - not a specific pressure.
Change the MAP sensor and the output voltage for a given boost pressure changes too, throwing your fuel/ignition map calibrations out the window.
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Will soon stock suitable sensors and a range of chips to suit ;)
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Will these be turbo map applicable as well?
I wont be maxing out the standard map sensor (just) but would it be in my interest to get a 250kpa sensor?
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Will soon stock suitable sensors and a range of chips to suit ;)
good good you my man are a legend