When the Ferrari 488 Pista arrives in the summer, 50 per cent of the components that make up its 710bhp twin‑turbo V8 engine will be brand new. Here’s why… Words by Shane O’Donoghue.
1 Reduced charge air temperature
The temperature of the air entering the engine was a major focus for Ferrari’s engineers. A reduced temperature is desirable as it allows more spark advance before ‘knock’ sets in. This, in conjunction with higher valve lift for more turbulence, means faster combustion, improved efficiency and, ultimately, more power.
Repositioned engine air inlets compared with those on the 488 GTB allow for larger intercoolers ahead of the rear wheels, and the radiators in the nose are tilted so the hot air exiting them doesn’t find its way to those intercoolers. All that accounts for a six-degree drop in intercooler outlet temperature.
Next, a new, smaller carbonfibre air plenum and shorter runners feature ‘intake detuning’ at full load, making the air in the cylinders some eight degrees cooler at 8000rpm.
2 Improved throttle response
Ferrari claims that the 488 GTB already had best-in-class responsiveness and the Pista’s data reveals further improvements. A big part of this is down to the 17 per cent reduction in the weight of moving masses, achieved by measures including hollow inlet valves and new springs, titanium connecting rods and a lightened flywheel. This, in turn, has allowed for a lighter crankshaft.
The sharpest response is reserved for Race mode, where the closely integrated control of the wastegates, throttle bodies and spark timing results in a 0.3-second improvement in getting to full air-plenum pressure and vehicle acceleration when the driver pushes from 40 per cent throttle at 3000rpm to wide-open throttle.
3 Increased output
Taking a bigger leap up in power than previous special series models such as the 458 Speciale and 430 Scuderia, the Pista makes 710bhp at 8000rpm, up from 661bhp at 6500rpm in the GTB. Peak torque is up 7lb ft to 568lb ft.
Surprisingly, these improvements are not due to more boost pressure. Indeed, the only change to the two IHI turbochargers is the addition of inductive speed sensors, allowing accurate optimisation of their speed limit rather than relying on model data. Instead, it’s the air temperature and spark changes (see point 1) that bring the bulk of the extra power. Meanwhile, new Inconel exhaust manifolds with longer runners and a larger pipe diameter mean reduced back pressure and pumping losses.
4 Reduced mass
Of the 488 Pista’s total 90kg weight reduction over the 1475kg GTB, the engine accounts for a significant 18kg. That’s despite the higher loads on the components due to ten per cent higher peak firing pressures.
The Inconel exhaust manifolds save 9.7kg, ancillaries including the air con compressor’s pulley account for 2.3kg, titanium connecting rods save 1.7kg, the flywheel is 1.5kg lighter, thinner cylinder liners save a further 1.3kg, the new crankshaft is 1.2kg lighter thanks to the elimination of the central balancing webs, and the hollow inlet valves and their lighter springs account for another 300g. How big a difference this all makes we’ll find out when we drive the car in a few months’ time.
|FERRARI 458 SPECIALE
|FERRARI 488 PISTA
|3902cc V8 twin-turbo
|597bhp @ 9000rpm
|710hp @ 8000rpm
|398lb ft @ 6000rpm
|568lb f t @ 3000rpm
|7-speed dual-clutch automatic
Above: how the 488 Pista compares with its naturally aspirated 458 Speciale predecessor