Winding Fourth gear out to redline wasn’t an option, at least not a sensible one. The sun-cracked, High Desert, two-lane B-road we were using for acceleration runs felt uncomfortably claustrophobic north of 125mph.
At those speeds, tire noise was deafened and solid bushings transmitted every surface imperfection, causing exaggerated twitches to pass nervously through the steering wheel. The car felt as if it was edging closer to where power and speed would overcome it tenuous grip on the road.
After lifting the throttle, I muttered to evosport’s Simon Atik alongside me in equal parts astonishment and amusement, “This thing’s ridiculous!” He agreed: “It’s far too fast for this road.”
Evosport is renowned for its tuning work on BMW and AMG models, but that hasn’t stopped them working on Porsches as well. Prior to this evo3-900 conversion, the company created the evo3-750 and evo3-850, with the final three digits indicating overall engine output.
For this project, a client produced a list of goals: It would have an automatic transmission, offer supercar performance, be daily drivable and ready for the track. This would be no mean feat…
Starting with a 2007 (997.1) 911 Turbo, the five-speed Tiptronic was one of the first components to fortify. During testing, the transmission showed signs of slipping, so a high-performance torque converter was added with a higher stall speed, new valve body and new control ECU to provide increased line pressure for quicker, firmer shifts.
For the engine, evosport tried a few different spools before settling on a pair of Garrett GT30 turbos. These gave them both the response and top-end power they were looking for.
To this base the tuner added its high-flow intake system, IPD plenum chamber and an 83mm throttle body. A set of 80 lb fuel injectors were also installed, along with an upgraded fuel pressure regulator and reprogrammed ECU.
A pair of thicker intercoolers help reduce intake temps, while stainless steel headers and a custom inconel-alloy exhaust dispatch the waste. Inconel headers are also in the works but weren’t on the car at the time. All exhaust parts were made in-house.
As a result, the company claims 900hp at 6200rpm with 17.4psi on race gas, or 775hp at 16psi on pump. The torque figures are similarly impressive: 880 lb-ft at 4000rpm on race gas or 750 lb-ft on 91-octane. The internals remain stock, somehow.
Under daily driving conditions, the car slides on a wave of torque but you don’t sense the turbos spooling until you dip deeper into the throttle. As the revs rise, the sleeping giants are nudged awake, and while a stock Turbo is more responsive down low, probably getting the jump on this evo3 off the line, it would be no match for what happens when the GT30s start spinning.
After 3000rpm, the pull is relentless, growing exponentially and not receding until redline. The impact could cause a seismic shift in the tectonic plates. Imagine a low-flying missile with four wheels strapped to it and you’d be close. Power peaks at 6200rpm but it continues to pull hard to 7000rpm.