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The setups I'm used to use a stepper motor to drive the IAC pintle, so the count is what's commanded/expected. I've never seen one with feedback that tells you the actual position.
Luke is correct, a datalog will tell you what the IAC is supposed to do, but not what it actually does. The IAC doesn't have that capability to give relative position to the ECU for recording.
Now, if the datalog is saying its doing funny things, that could still be an indication of a problem. But if the IAC is faulty and the engine is stalling its probably going to say its opening when in reality it may not be.
Overall...... I'm currently happy as F**k with it
The ability to do rolling burnouts would be awesome, but when you juice up a pig, you can only expect so much.
Getting REAL close to swapping rear tires finally.
Next set is one size skinnier, but .75" taller. So probably about the same .
Eventually, I'll get to putting wheels identical to these back on it. (Probably without the rings, or thinner ones). So i can go down to 245's.
Then we'll get some LONG posi marks lol.