When we wrote about the new Ford Focus price tag and engine options, we talked about it’s impressive 252 hp and 270 lb-ft of torque from its 2.0-liter EcoBoost engine. Now we’ve learned more about the ‘overboost’ feature that allows for those incredibly high numbers.
Update-June 11: Ford just issued a press release explaining that the Overboost function extends the peak torque from 3,000 rpm to 4,500 rpm. This is in contrast to other EcoBoost powered vehicles that hit their peak torque, then drop off.
Ford also mentioned that the Focus ST will be available with a unique Tangerine Scream metallic color, as well as race-inspired Recaro® seats with matching color accents.
“When your foot is all the way to the floor, you call up an additional 15 lb-ft of torque,” explains Chris Terry, a Ford Focus communications specialist. “It just dials in more boost for 15 seconds.”
That means that the Focus ST reaches its full torque number for only 15 seconds at a time. Terry said that the extra power is only provided for this short amount of time to protect the engine.
“Thats the beautiful thing about turbo chargers,” Terry said, noting that the process is done by the Engine Control Unit (ECU) which pumps more boost into the turbo.
“It’s fair to say in future EcoBoost performance engines, that overboost will be used,” said Terry in reply to whether more vehicles will sport this new feature.
This technology is already in use in some diesel vehicles in Europe, and now it is being adapted to gasoline engines here in the States. The EcoBoost four-cylinder engine in the Focus ST is the first small EcoBoost performance engine, according to Ford.
Terry likens the overboost feature to a computer term called “overclocking” where you make a computer component run faster than it was originally intended. The major difference is that Fords overboost only allows it for 15 seconds, in an effort to protect the engines durability.
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