Quote:
Originally Posted by serialk11r
Correct, many older engines did not run rich at WOT until about 3500-4000rpm. Stepping hard on the gas is less detrimental in those cases.
Everything newer though does go rich. All of the Toyota [A/N/Z/G/U]R engines do for example.
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I'm getting a bit off topic here, but this is in reference to engines as new as engines as new as 2015. I don't know if the revisions which got direct injection started going rich under heavy load, but that would be in the last 4-6 years.