Author Topic: boost pressure sensor '250 kPa' (1,5 Bar)?????  (Read 4652 times)

Offline poloeatonm45

  • Members
  • *****
  • Posts: 287
boost pressure sensor '250 kPa' (1,5 Bar)?????
« on: December 10, 2008, 08:58:00 pm »
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 ?

Offline hayesey

  • Administrators
  • *****
  • Posts: 5824
  • The CV joint killer
    • ClubG40
Re: boost pressure sensor '250 kPa' (1,5 Bar)?????
« Reply #1 on: December 10, 2008, 09:09:54 pm »
you'll need a map specifically to suit the 250kpa sensor.

Offline poloeatonm45

  • Members
  • *****
  • Posts: 287
Re: boost pressure sensor '250 kPa' (1,5 Bar)?????
« Reply #2 on: December 10, 2008, 09:12:05 pm »
god dam i just bought that chip too grrrrrrrrrr thanks for the info mate

steven

Offline Phil

  • Members
  • *****
  • Posts: 395
Re: boost pressure sensor '250 kPa' (1,5 Bar)?????
« Reply #3 on: December 10, 2008, 10:15:47 pm »
you'll need a map specifically to suit the 250kpa sensor.

Are you sure?? I didnt think that was the case...

Offline poloeatonm45

  • Members
  • *****
  • Posts: 287
Re: boost pressure sensor '250 kPa' (1,5 Bar)?????
« Reply #4 on: December 10, 2008, 11:22:20 pm »
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

Offline hayesey

  • Administrators
  • *****
  • Posts: 5824
  • The CV joint killer
    • ClubG40
Re: boost pressure sensor '250 kPa' (1,5 Bar)?????
« Reply #5 on: December 11, 2008, 09:31:03 am »
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. 
« Last Edit: December 11, 2008, 09:35:46 am by hayesey »

Offline Andy

  • Traders
  • *****
  • Posts: 1503
Re: boost pressure sensor '250 kPa' (1,5 Bar)?????
« Reply #6 on: December 11, 2008, 12:37:44 pm »
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.


Offline Yoof

  • Traders
  • *****
  • Posts: 2355
  • I know naathing..
    • Polo Performance Parts
Re: boost pressure sensor '250 kPa' (1,5 Bar)?????
« Reply #7 on: December 11, 2008, 02:11:23 pm »
Will soon stock suitable sensors and a range of chips to suit  ;)


Offline Max

  • Members
  • *****
  • Posts: 485
Re: boost pressure sensor '250 kPa' (1,5 Bar)?????
« Reply #8 on: December 11, 2008, 02:25:04 pm »
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?

Offline poloeatonm45

  • Members
  • *****
  • Posts: 287
Re: boost pressure sensor '250 kPa' (1,5 Bar)?????
« Reply #9 on: December 11, 2008, 08:01:58 pm »
Will soon stock suitable sensors and a range of chips to suit  ;)



good good you my man are a legend