4r70w Temp Voltage/Temp Formula? - TCCoA Forums
 
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post #1 of 3 (permalink) Old 11-07-2002, 10:47 PM Thread Starter
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4r70w Temp Voltage/Temp Formula?

Does anybody know the correlation between the tft sensor voltage and trans fluid temp?

I figured this formula but its kinda big:

temp = (-7E-09x)^5 + (5E-06x)^4 + (-0012x)^3 + (0.1497x)^2 + (-9.2277x) + 370.80

where x = 0 to 255

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1998 4R70W Controlled by Baumannator TCS., 3.73 Track Lock Rear., Bauman Lev 3 Shift Kit.
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post #2 of 3 (permalink) Old 11-08-2002, 03:20 PM
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good lord, thats a big equation. I haven't had math in years and it made my head hurt. lol. anyways, I wonder how accurate the TFT sensor is? Would it be accurate enough to hook a temp gauge to or would it be like hooking and air/fuel ratio gauge to a factory O2 sensor?

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post #3 of 3 (permalink) Old 11-08-2002, 04:33 PM Thread Starter
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Mustangs with Trans Temp Guages use the TFT sensor in the tranny to display the temp, however those gauges are very in-accurate. (just like the ford bottom heavy fuel gauge).

My TCS shows the temperature but only in hexidecimal 0x00 to 0xFF , However keep failing to call Gregg to ask him the formula.. (as he probably won't be kind to release).. I have emailed him with no reply... Even offered the design..

The reason I ask is, i have build a custom LCD display to display all my tranny info on the lcd screen.. on my dash.. However, I have ran out of room to implement a lookup table for the tft temp, But may have to goto some sort of external i2c serial eeprom. (note this info is pulled from the TCS and not the harness..)

1984 Merc Cougar
5.0L, GT40X HEADS, E303 CAM,X303 Valvetrain
1998 4R70W Controlled by Baumannator TCS., 3.73 Track Lock Rear., Bauman Lev 3 Shift Kit.
190LPH, 67mm EGR, 65mm TB, 73mm C&L MAF, 24lb/h Inj, TwEECer RT, A3M EEC-IV
TCCoA-AHole Crew 2004
Disclaimer: The opinions expressed in my posts are my own. They are not meant to start a flame war or discourage people. Just my honest opinion and nothing more
Just great, 4 mores years of GOP crap, Im republican, and I endorse this message
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