As I continue with the modifications on my Turbo 2.0 Spider, I find myself wondering what the weak link is in this motor. I’m currently pushing 207hp at the wheels (~240bhp) on 93 octane and 14psi of boost. I will soon switch to e85 and tune it to suit, where I will likely see even more gains from additional timing. The engine is bone stock from valve cover to oil pan with 113k miles, though it is unknown whether or not it has been rebuilt by a previous owner. So my question is, where’s the limit? What’s the weak link? Headgasket? Rods? Pistons? I will build a motor in the future, but for now the stock motor is holding just fine, and is reliable enough to be my daily driver with the occasional long trip.
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