This 900hp air-cooled sleeper is WILD!

With 903hp at the wheels, a 9.71-second quarter-mile at 161mph on an unprepped strip, and a fully air-cooled 3.6L turbocharged engine, this Porsche is the definition of a sleeper. In this video, we chat with Arthur to uncover the secrets behind his beastly build.

Originally a 230hp Carrera Supersport, Arthurs Porsche now runs 102mm LN Engineering Nikasil barrels, ARGO conrods, a GT3 RS crank, CMW Racing billet heads prepared by Rams Head Services, and a Precision 8385 turbo pushing 38 PSI. The drivetrain features a 996 Holinger sequential gearbox, billet 32-spline axles, and OEM Porsche (yup!) CV joints.

Cooling is a unique challenge for this air-cooled monster, with dual oil coolers, fuel cooling strategies, and a switch to a water-to-air intercooler keeping intake temps in check so far without the need to use ice on the strip. Engine management comes from a tried-and-true Autronic ECU, once a leader in the market but now a little long in the tooth but an AEM dash/logger helps keep it ticking the boxes it needs to for this particular project.

Running on E85, with dual 1000hp Weldon pumps and a Bosch 044 primer, this car shows what’s possible when you push air-cooled tech to its limits and it was awesome to see running in the Flying 500 at the World Time Attack Challenge. A sleeper? Absolutely. But one that’s redefining what these classic Porsches can do.

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TIME STAMPS:
0:00 - Arthur's 900hp, 9 Second Porsche
0:20 - Build Progression
0:56 - 491 3.2l N/A Stock
1:18 - 230hp Stock
1:27 - Air Cooling Challenges
2:00 - Fuel & Oil Cooling
2:35 - 102mm Nikasil Coated Barrels
2:43 - Argo Conrods
2:49 - GT3 RS Crank
2:53: - CMW Billet Heads
3:15 - 900hp Aftermarket Support
3:42 - Individual Cylinder Barrels
4:14 - Ductile Iron Sleeve?
4:24 - Head Cylinder
5:03 - Turbocharger
5:29 - Powerband
5:54 - Billet 32 Spline Axles
6:00 - OEM Porsche CVs
6:13 - Holinger Sequential '996' Gearbox
6:28 - Autronic ECU
6:34 - Older ECU Limitations
6:45 - Autronic History
7:02 - AEM Dash Logger
7:15 - Water To Air Intercooler
7:48 - Intercooler Efficiency
8:14 - E85 Fuel System
8:40 - BUILD.TUNE.DRIVE