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Location:
Newcastle
Registered:
June 2004
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st185 GT4 boost sensor
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Wed, 30 March 2005 00:32
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Hey i need a new boost sensor for my car just wondering if i could use a boost sensor off any genII 3SGTE or if it would have to be the boost sensor off a st185. Thanx,
Bill
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Location:
Newcastle
Registered:
June 2004
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Re: st185 GT4 boost sensor
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Sun, 03 April 2005 23:30
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anyone?
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: st185 GT4 boost sensor
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Mon, 04 April 2005 04:28
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no you cannot.
Gen2 3sgte uses a 2 bar map sensor to drive the boost guage and give the ECU a boost cut signal.
Gen3 3sgte uses a 2.5-3bar (not sure exactly) maps sensor which the ecu uses for sensing engine load.
IE. the two are not compatible.
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Toymods Vice President
Location:
Sydney
Registered:
May 2002
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Re: st185 GT4 boost sensor
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Mon, 04 April 2005 05:00
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There are two different parts used for Gen 2 map sensors. One has a 12PSI boost cut and the other 17PSI.
I know the ones of the same part number are definately interchangable between MR2 and GT4. I do not know if the different models are interchangable though.
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Location:
Sydney
Registered:
October 2003
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Re: st185 GT4 boost sensor
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Mon, 04 April 2005 05:21
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Probably not the greatest idea as you'll be loosing your 'boost cut', but this was suggested to me when I was struggling to find one. It's basically just making something to send a signal to your ECU to say that everything's ok.
| JimKing |
To carry off this deception, you probably want to use a resistor "bridge". You use two resistors in series wired between ground and the +5v MAP sensor supply. You connect the MAP signal wire to the junction between the two resistors. The junction voltage is proportional to the resistances.
Vj = R2 / (R1 + R2) * 5.0v, assuming R2 is connected to the 5v supply, and R1 is connected to GND.
A two bar map sensor should read about 2.5v at 0.0psi, so if you want to simulate that, then a couple 10k ohm resistors should do.
See if this artwork helps:
.........R1.....................R2
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..|---\/\/\/\/\----O----/\/\/\/\/----|
..|....................|.......................|
..|....................|.......................|
.GND...............Vj...................+5V
..............(to ECU PIM input)
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Location:
Newcastle
Registered:
June 2004
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