Quote:
Originally Posted by WRX06TR
Cast iron block that can take 30 psi. Not to mention it can spin to 7k or higher.
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Nope, not really. For one thing, the EJ205 spins to 7200 stock. The basic difference is manifold length, plus a less undersquare bore/stroke ratio. The Evo is no easier or harder to push to higher RPM- look at the v7 STi Spec C RA. 8200 stock warranteed redline.
The long intake runner length and the VERY long distance from the exhaust valves to the turbine is the main culprit. It's also why the Subarus tend to make better torque at low and midrange RPM.
The bore and stroke are also more conducive to right-shifting powerbands in the Evo. To be honest I grasp the differences well enough to agree with them, but not well enough to clearly explain. Rod/stroke ratios have a lot to do with how your VE works out at a given RPM, and how much force is acting on the pistons at a given engine speed.