EvoScan Temperature Formulas
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Chris,
now I'm confused!
for IAT and Coolant temp, Evoscan 2.8 uses x-40 for temp in C (in the imperial section)
and the formula listed above for temp in C also (for metric)
so - is the correct value for temp in C the "x-40" or the other formula
as they give values that are 5-6 C apart
eg if x=140,
temp = 100 , or temp = 94 , depending which method you choose.
94 i can live with on the track. 100 means i need to back off
now I'm confused!
for IAT and Coolant temp, Evoscan 2.8 uses x-40 for temp in C (in the imperial section)
and the formula listed above for temp in C also (for metric)
so - is the correct value for temp in C the "x-40" or the other formula
as they give values that are 5-6 C apart
eg if x=140,
temp = 100 , or temp = 94 , depending which method you choose.
94 i can live with on the track. 100 means i need to back off
Evoscan 2.8.0005 that I have lists intake/manifold/coolant temps as 1.8*x-50 for *F with no metric equivalent so I'm assuming that (((1.8*x-50)-32)*5)/9 will convert it to Metric *C unless I screwed it up!
In your example if x=140
(((1.8*x-50)-32)*5)/9 = 72*C
1.8*x-50 = 162*F
72*C is about 162*F according to online calculators to double check my math.
Last edited by Hiboost; Sep 15, 2011 at 10:53 AM.
Your math is wrong.
Order of operations states that Multiplication goes before Addition. (Computers always follow these rules.)
You took 1.8 * (140 - 50) instead of (1.8 * 140) - 50.
The correct conversion for Celsius is x-40. The correct equation for Fahrenheit is 1.8 x - 40.
If you want an Algebraic Proof:
F = 1.8 * C + 32
Plug in the above equation of x - 40 (used to convert raw value to C)
F = 1.8 * (x - 40) + 32
F = 1.8 x - 72 + 32
F = 1.8 x - 40
Order of operations states that Multiplication goes before Addition. (Computers always follow these rules.)
You took 1.8 * (140 - 50) instead of (1.8 * 140) - 50.
The correct conversion for Celsius is x-40. The correct equation for Fahrenheit is 1.8 x - 40.
If you want an Algebraic Proof:
F = 1.8 * C + 32
Plug in the above equation of x - 40 (used to convert raw value to C)
F = 1.8 * (x - 40) + 32
F = 1.8 x - 72 + 32
F = 1.8 x - 40
Sorry, I missed the x-50 for SST's temp.
I don't think that's right. I think the SST stuff uses x-40 = Celsius scalings.
It would be super easy to confirm. Take a cold car, turn on (don't start) and log the SST temps. They should equal ambient temps.
I don't think that's right. I think the SST stuff uses x-40 = Celsius scalings.
It would be super easy to confirm. Take a cold car, turn on (don't start) and log the SST temps. They should equal ambient temps.
ALTHOUGH when I sniffed the MUTIII (to get these logables) I checked the MUTIII screen for what it thought the temp was...
So the MUT3 could be wrong - so someone with an SST test Goldens method