ait stuck @ 21* r4 r7 resistors maybe? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 12-11-2011, 04:36 PM   #1
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Default ait stuck @ 21* r4 r7 resistors maybe?

hi guize....so yea i was just reviewing some datalogs and i realized my ait is not changing. its been stuck at 21*C i cant beleive i diddnt notice that before. if i disconnect it it jumps to 75*C ive been driving the car like this for about a month. its been running pretty well i gotta say.

anyway im sharing the stock coolant temp sensor but im using a dedicated gm iat. i remember when i built the megasquirt i left r4 and r7 out because in the megamanual it sort of assumes youre going to be sharing both sensors or youre just going to have dedicated sensors, im sort of in the middle. im pretty sure one of them is for the coolant temp and the other is for the manifold temp so im just trying to figure out what resistor i need to put in the r4 or r7 spot, ive tried the google method but i couldn't find any info.

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Old 12-11-2011, 04:49 PM   #2
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did you calibrate the sensors?
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Old 12-11-2011, 04:54 PM   #3
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did you calibrate the sensors?
yea. well i calibrated the clt. i know thermostats open @ like 95*C degrees and i noticed most of the time thats right around where the clt gauge hovers in tunerstudio, so im pretty sure its right.
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Old 12-11-2011, 05:11 PM   #4
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try recalibrating, since it's shared you need to use 1155 as the bias.
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Old 12-11-2011, 11:40 PM   #5
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try recalibrating, since it's shared you need to use 1155 as the bias.

thats odd. i just set it to the preset mazda settings for clt, the bias resistor value was way higher than 1155. but like i said for some reason its giving me reasonable values that i feel are correct. it starts at about 20-30*c and then rises up to abotu 95.

the iat is the one thats giving me problems. im pretty sure i need to throw a resistor into the r7 or r4 just not sure which one.

ugh i need to probe that connector i hope its getting 5volts. i should have done that first.
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Old 12-11-2011, 11:42 PM   #6
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the bias of 2459 (or whatever is it) is the resistance value of r7 and r4, without them in place, that number is not correct obviously. you must match the bias of that of the pullup in the stock ECU and thats 1544
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Old 12-15-2011, 10:04 PM   #7
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http://www.msextra.com/doc/general/ms3v3schems.html

so yea after looking at the schematics of the v3 board it looks like r4 is for the air temp. im going to try and pop in a 2.4k resistor and see what that does.

i tried recalibrating it Brainy but to no avail :(

i hope this **** works
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Old 12-17-2011, 02:46 AM   #8
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**** works

megasquirt is soooo bad ***.
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