A "retuned engine" refers to an engine that has been adjusted or modified to improve its performance, efficiency, or other characteristics. Full definition
The IPL convertible edition makes use of retuned engine - management software and a freer - flowing exhaust for a minor bump in power, but it comes only with an automatic transmission. (kbb.com)
The 2004 Mazdaspeed Miata package is quite fabulous as is, with its newly turbocharged, 178 - horsepower engine (that's 25 percent more than the base car), tuned suspension (larger front and rear antiroll bars, stiffer springs, tuned Bilstein dampers, lowered ride height, and retuned engine mounts), quickened steering response, and striking five - spoke Racing Hart alloy wheels wrapped in Toyo Proxes R28 P205 / 40R -17 high - performance unidirectional tires. (automobilemag.com)
Efficiency and driving performance were two major areas of focus when retuning the engines. (thekoreancarblog.com)