At what temp does IAT pull timing?

[Snakebitten]

Just wondering what temp the IAT has to be before the computer start pulling timing? Also the coolant temp, if you know.

 

[Bdubbs]

Ask your tuner, they make adjustments in the tune when they want the ecu to start pulling timing and how much.

 

[Snakebitten]

Thanks, but I was curious about a stock vehicle.

 

[Bdubbs]

Thanks, but I was curious about a stock vehicle.

Gotcha, sorry I didn't know you had a factory s/c car.

 

[slow306stang]

Gotcha, sorry I didn't know you had a factory s/c car.

:lol:

 

[Vert]

Are you talking about just IATs as in through the air filter or IAT 2s which the blower to intercooler temps. I would think IAT would start to pull timing in the low 100s and IAT 2s in the120s

 

[mjohns930]

I'll have to go in and look when I have a chance, but it's not quite as simple as just adding or pulling timing at a certain temp. There are two tables for IAT: one is temperature based and the other is load vs RPM (IIRC). The temperature based table might give a base value of say -50 at 125*F and the load vs RPM table might give a multiplier value of 0.10 at a given point. You multiply those values to come up with the final timing addition or subtraction, so in this example at 125*F IAT and for a given load/RPM the PCM would pull 5*. That's not the actual values, I need to go in and look, just giving a primer since I'm not at my computer. ECT is the same sort of deal with two tables.

 

[mjohns930]

Just dug it up. IAT starts pulling at 150*F and ECT starts pulling at 250*F. This is on a stock 2014 GT. IAT is also adding timing below 100*F and ECT is adding below 200*F. How much it tries to add or subtract depends on the base x multiplier as explained above.

 

[Snakebitten]

Thanks mjohns, and bdubbs, I was asking for a friend, but thank you soooo much for your helpful input.