Quote Originally Posted by Bidja View Post
Yeah, this is how I read it first (blue current tune with reduced AFR/richer mix).

My understanding: lower the AFR is richer the mix (more fuel)) means smoke and engine heat. Not enough fuel (a high AFR) means clean running and lower engine temperatures.
Shit I actually got that wrong, blue is pre tune and black is post tune. So your theory is correct.

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