Buschur race "chip" - a big success
Aug 31, 2005, 03:51 PM
#49
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Did a little test with a scan tool today. Car idling . 85 F ambient temp.
Found out that the fans kicks on once coolant temps reach 190 F degrees.
Fan blows for 10 sec. and shuts back off when temps hit 185 F.
Found out that the fans kicks on once coolant temps reach 190 F degrees.
Fan blows for 10 sec. and shuts back off when temps hit 185 F.
Aug 31, 2005, 06:20 PM
#53
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is this chip something that plugs in under the hood? or is t something that could be toggled inside the cabin.. like on the go just plug it in or flip a switch..
Aug 31, 2005, 06:36 PM
#54
yes, that is my thought on it, I have found the corresponding voltage that the sensor reads when the coolant is at 180 degrees, now I just need to devise a way to knock 12 volts down to the correct voltage. (I'm really bad w/ electrical components)
Aug 31, 2005, 06:51 PM
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AL: do you think I can get one up there on Sept17th? I don't think they will be selling/installing parts but maybe Buschur could put one aside for me? That way I could dyno with it in..
Sep 1, 2005, 02:16 PM
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Originally Posted by honki24
yes, that is my thought on it, I have found the corresponding voltage that the sensor reads when the coolant is at 180 degrees, now I just need to devise a way to knock 12 volts down to the correct voltage. (I'm really bad w/ electrical components)
Sep 1, 2005, 02:56 PM
#58
Sounds to me like it's a thermistor in series with a resistor to either 12V or 5V. The other side of the thermistor is connected to ground. The sensor changes resistance with temperature. The change in resistance will cause a change in voltage where this voltage is feed to the ECU (V = I X R). With things like that typically there's a look-up chart or equation that correspond voltage to temperature. Find out what voltage you want and hook up a resistor across the sensor (thermistor) to force the voltage to always be below or over what you want.
The other way around would be to find out where in the calibration files (EEPROM location in ECU) this value is store and change that value (trip point).
The other way around would be to find out where in the calibration files (EEPROM location in ECU) this value is store and change that value (trip point).
Last edited by GOKOU; Sep 1, 2005 at 02:59 PM.
Sep 1, 2005, 03:54 PM
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Hah !... did more testing.
180 F degrees = 5.20 - 5.40 M ohms across the coolant temp sensor.
185 F = 4.60 - 4.80 M ohms
190 F = 4.20 - 4.60 M ohms
200 F = 3.60 - 3.80 M ohms
So if you jump the connector with a 5.2 M ohm resistor, The ECU will continuously read 180 F degrees.
Just went to Radioshack and I'll do more tests tommorow.
Note: This won't be advisable in the street for the ECU needs to see the actual reading of the temp sensor or it won't turn the fans on cause it won't ever see 190 F with the resistor on.
180 F degrees = 5.20 - 5.40 M ohms across the coolant temp sensor.
185 F = 4.60 - 4.80 M ohms
190 F = 4.20 - 4.60 M ohms
200 F = 3.60 - 3.80 M ohms
So if you jump the connector with a 5.2 M ohm resistor, The ECU will continuously read 180 F degrees.
Just went to Radioshack and I'll do more tests tommorow.
Note: This won't be advisable in the street for the ECU needs to see the actual reading of the temp sensor or it won't turn the fans on cause it won't ever see 190 F with the resistor on.
Sep 1, 2005, 06:04 PM
#60
Originally Posted by Nad1370
Hah !... did more testing.
180 F degrees = 5.20 - 5.40 M ohms across the coolant temp sensor.
185 F = 4.60 - 4.80 M ohms
190 F = 4.20 - 4.60 M ohms
200 F = 3.60 - 3.80 M ohms
So if you jump the connector with a 5.2 M ohm resistor, The ECU will continuously read 180 F degrees.
Just went to Radioshack and I'll do more tests tommorow.
Note: This won't be advisable in the street for the ECU needs to see the actual reading of the temp sensor or it won't turn the fans on cause it won't ever see 190 F with the resistor on.
180 F degrees = 5.20 - 5.40 M ohms across the coolant temp sensor.
185 F = 4.60 - 4.80 M ohms
190 F = 4.20 - 4.60 M ohms
200 F = 3.60 - 3.80 M ohms
So if you jump the connector with a 5.2 M ohm resistor, The ECU will continuously read 180 F degrees.
Just went to Radioshack and I'll do more tests tommorow.
Note: This won't be advisable in the street for the ECU needs to see the actual reading of the temp sensor or it won't turn the fans on cause it won't ever see 190 F with the resistor on.
Last edited by GOKOU; Sep 1, 2005 at 06:38 PM.