1994 Toyota Supra Turbo - Powerhouse Supra

The Supra was equipped with Monocoque Racing wheels-15x10 rear and 15x3.5 front. Rubber consists of Mickey Thompson front tires and Goodyear 28x11.5 slicks, the largest size that fits under the Supra without removing all of the rear sheetmetal. For street use, the car runs 18-inch Racing Hart wheels. The brakes were changed to smaller and lighter non-turbo Supra brakes in the rear and highly modified versions in the front to accommodate the skinny 15x3.5 wheels. Stainless-steel brake lines were added to help maximize stopping power.

Under the hood, PHR's plan was to simply outdo themselves. Considering the company had constructed a 1,000-hp 1998 Supra two years ago, that was a tall order. The PHR crew built a race-spec engine using Carrillo rods, SPS Carr rod bolts and JE pistons. The crankshaft was modified by PHR to increase oiling at higher engine speeds and treated to a balance and hardening process.

The rods and main journals reside on custom bearings and ARP studs hold the assembly together. A custom-modified PHR oil pump was installed, along with a PHR-lightened water pump. The cylinder head was worked to Stage 3 specifications, using 2mm oversize pro alloy valves, dual valve springs and titanium retainers and buckets. Custom PHR camshafts were ground to generate efficient high-rpm operation at 40-plus psi.

Once the long block was complete, PHR then turned its focus to constructing a Stage 3 intake manifold. Using a factory Toyota lower intake flange and runners (enlarged and ported), the Stage 3 is the largest intake designed by PHR, with an internal diameter of 4-inches. The intake manifold is fed through a 75mm throttle body. On the exhaust side, PHR decided to utilize the largest single turbocharger available, the new Turbonetics Y2K (T100). In order to mount this turbocharger to such a small engine, a custom stainless-steel header was fabricated using 1-7/8-inch primary tubing to feed a single 3-inch turbo flange. PHR found it almost impossible to keep the large turbo under the hood line, so it was decided to construct an air inlet capable of feeding the giant hairdryer with a constant supply of cold air. A hole was cut into the new TRD hood and a custom aluminum air inlet was grafted in place. This set-up is reminiscent of Kenny Duttweiler's red Buick. An HKS GT series wastegate was called upon to maintain boost pressure. Once finished, the entire exhaust side of the turbo system was treated to an HPC extreme coating to reduce heat transfer. PHR then constructed 3-inch mandrel-bent intercooler plumbing to complete the system. The intercooler piping was completely chrome plated, courtesy of Tex Plating.

When the project began, a Spearco liquid-to-air intercooler was installed since the engine ran on gasoline. However, as time progressed, it was decided to utilize a gasoline/alcohol mixture that had been prototyped on the PHR race Supra. Therefore, the intercooler was removed and new plumbing was installed that fed the charge air directly to the throttle body. The engine was dropped into the car using PHR solid engine mounts.