Rear Facing Exhaust Manifold Layout
The reversed intake layout puts the exhaust side toward the rear of the vehicle. The manifold is designed for the traditional twin scroll type and is made from stainless steel, weighing in at 6.45kg. The same unit from the final version of the 4G63 weighs in at 6.8kg. The front pipe never extends across the oil pan, which minimizes oil temperature problems.

Turbocharger Matched For 2.0- Liters On The Brink Of Completion
The Evo IX was fitted with a TD05H166C-10.5T turbocharger, whereas the 4B11 comes equipped with a TD05H152G6-12T turbine. The new turbo has gone back to the traditional spinning rotation from the Evo IX's reversed scroll setup. Although the 4B11 turbo handles more volume, it also builds boost from the low rpm region with the lower trim impeller size. The impeller itself is made from aluminum and has a titanium aluminum turbine wheel that's good for 360 hp. The turbocharger relative to the 2.0-liter setup feels like a modified setup that's on its last tuning stages. As an option, an Inconel turbine wheel is available for higher loads.

Big Capacity Outlet Pipe
The outlet pipe is constructed in a bigger capacity to yield the combination of the exhaust gas coming from the turbo and the bypass gas coming from the swing valve. The 57mm outlet weighs 3 .3kg and seems like it's a high-quality aftermarket product.

Electric Throttle- Enabled Surge Tank
The 60mm throttle body diameter remains unchanged,however, the capacity of the surge tank was increased along with a design that emphasized in consistent and efficient air distribution to each cylinder. However, it's unfortunate that the intake manifold faces the front of the car, since the collector portion was designed to be positioned lower, like the SR20s seen in S13s. The electric throttle system should also raise problems for the aftermarket tuning industry.

High-Resistance Injectors
High-resistance Bosch injectors with 540cc/min were found in the 4B11 T/C engine. The outer casing of the injector looks identical to that from the VQ35DE, but shows a variance with its extended nozzle. These injectors don't protrude inside the ports for the specific reason of decreasing intake air resistance.

4B11 In Comparison And Final Engine Analysis
The overall synopsis of the disassembly of the 4B11 T/C revealed the obvious. The new Lancer Evolution 4B is a completely different engine from the 4G63. It was interesting to reveal after cross-referencing our data that we found many dimensions to be similar to the SR20 engine. Originally, the vertically laid out 4G63 is an old design, which was improved gradually until its final model equipped in the Evo IX. The final 4G63 pushed out 280 hp/6,500 rpm and 41.5kg-m/3,000 rpm of torque. The 4B11 was designed with this final model in mind, and on top of that more performance and numerous efficiency features were added to an engine that was designed to maintain low-emission characteristics. The 4B11 T/C pushes 280 ps/6,500 rpm (Japan spec) as well, and an increased torque output of 43.0kg-m/3,500 rpm, which still complies with the recent Japanese emissions standards. Although the power output regulations were abolished (Japan), the vehicle was kept at 280 ps but with the added performance aspects over the Evo IX. Upon completing the reverse engineering process of the engine, we came to the conclusion that the overall design of the 4B11 is a sign of the times that follows a new trend of modern conventional engines we see today. At this time, the fact that the engine is comprised of an aluminum block may scare off many who have become accustomed to the 4G63 cast-iron block. Many fear that since this is an aluminum engine it's prone to such problems as engine knock during tuning, burnt pistons, boring of the cylinders (ignoring the sleeve thickness) and re-sleeving. However, we've found the 4B11 to be a good engine. With Tomei Powered's years of experience and extensive knowledge gained with the 4G63, SR20DET and EJ20 engines, we're confident to say that the 4B11 is definitely an engine that can be modified for increased performance. To what level of modifications is too early to say but stay tuned as Tomei Powered will use this detailed information gathered from our engineers and build new and exciting products for the 4B11.