Thread: Nismotronic SA map tuning.

set a gauge for it homie

I was just trying to determine if the values you are getting are correct. Why did you decide on using a 4.7k resistor?

i believe my values are correct, reason for this is it matches ambient air temps, i did do some testing afterwards.. we have a lazer thermometer instead an when using that to compare what the probe thermometer and iat are seeing, they are usually very close, within a few degrees if not spot on..

Radioshack only had 4.7k, made my decision easy.. and honestly it puts the iat in a good zone for temps..

The 4.7k is close enough to 5k to use it.

It will slightly change the reading of the sensor, but not by much.

The IAT table really isn't as hard as you guys are making it seem. If you simply go into Fuel Trims -> IAT corrections, you can adjust the fueling for different temperatures.

NOW, this method works well with the IAT in the charge pipe as the sensor will not get heat soaked from the intake manifold.

If you are running the IAT in the intake manifold then it is advised to use the IAT density map to further dial in/out the heat soak on the sensor to get it to perform consistently.

So what is the purpose of the resistor? Lowering the current?

Yup as is drives well. Temperatures have been between 60-90*F here and it's been fine. That's without even closed loop, with Closed loop on, it's even less noticeable.



EDIT YOU need to use a resistor
I thought you were using the resister to make the IAT see a certain value.

u have to use it from what i understand.. the iat only has 2 wires, 1 being ground.. check my thead out in the nismotronic section n00b

YEEESSSS This its the way I did on mine!!

what did you do?

Connect the IAT directly to the breakout box without any resistors and rescale the IAT table to get the ecu to read properly the IAT.