X57RS hits 425bhp!

X57RS hits 425bhp.

Further development of the X57-series turbos and the associated MAXD-Out mapping has seen us hit a new high of 425bhp (365whp) and 440Nm, a fantastic figure from the 1600cc EcoBoost.

Reaching the safe limit on UK fuel

We at Pumaspeed, with the help of our X57 customers, have been working extremely hard in the background with the guys at MAXD-Out to develop the X57 mapping further, and we feel we are now at the safe limit of this turbo set-up on UK-spec fuel. With well over 400bhp on tap, this track-focused ST180 is ready to dominate UK track days while keeping absolute reliability and driveability.

This power and torque is achieved on an incredible 1.95 bar of peak boost. To put that in perspective, hybrid turbos tend to run around 1.8 bar, so you are sacrificing very little engine reliability for almost another 100bhp. We also cap torque in the mid-range, because running too much torque too low in the rev range is a known weakness of the 1.6 EcoBoost.

Running this level of power obviously needs a built engine. Pumaspeed recommend the built Blue Top engine for all road and competition use. We believe the stock engine would be capable of this power level, but for the sake of durability we advise strongly against it.

How the X57 range has evolved

The X57 series has evolved since its debut in early 2019, mainly in response to customer demand.

• X57: the base unit remains unchanged. Combined with our full Stage 4R kit it comfortably sees around 365bhp and runs well within the limits of the standard 1.6 EcoBoost, for the customer who wants that extra edge over a hybrid-turbo ST180 such as a car on the X47R.
• X57R: achieved great success, hitting 380-plus bhp repeatedly, but very few customers wanted the middle of the range: they wanted either the base X57 or the top-of-the-range X57RS, so late in 2019 we discontinued it.
• X57RS: already has the reputation of being the first readily available bolt-on unit for the 1.6 EcoBoost to consistently hit 400bhp. Late in 2019 we added a competition spec, after feedback from the already large group of X57RS owners who, while happy with the immense power and quick-spooling nature of the unit, would happily trade a little lag for another 20 to 25bhp in competition use. So we went back to the drawing board and now offer both a Road spec (quicker spool, slightly lower peak power) and a Competition spec (slower spool, higher peak power).

That leaves two distinct turbo options: one designed for a stock-engine car, and one designed to be run on a built engine.

X57 370bhp turbocharger →X57RS 450 turbocharger →Blue Top bulletproof engine →All Fiesta ST180 tuning →

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