Originally Posted by XFireFreedom

I have a 2005 Crossfire 6speed complete stock. Srt6 and Base have the same M112 engine. I always thought that since it was the same engine then if I were to do custom turbo build then the engine could handle the boost. After research, the C32 AMG M112 has a lower compression ratio of 9:1 while my base M112 E32 has 10:1 CR. I want at least 12-14psi. Could I boost with the high compression? Yes, but that requires a dang good tune and still little margin for error, and I'm already using 93 gas and you're going to need more octane if you boost anything higher than 10:1 for the boost I want (from what I understand). PS This will be my first turbo build.

My questions:
1. How can I lower the compression ratio to at least 9.5:1 or lower, the easiest way. I would prefer not to have to change out the piston connecting rod or get a domed piston head (thats a lot of work to take the engine out and I am not that skilled of a mechanic, besides, and the piston rods in the srt6 are $200 a piece, and the base m112 comes with forged pistons which can withstand the boost I want anyways). Could i increase the combustion chamber by swapping/modifying the heads? what other easier ways can I lower the compression ratio in this engine.

2. Has anyone ever freaking done a turbo build for the BASE model crossfire that wants to give me some helpful tips or need-to-knows.

Miscellaneous:
ECU ideas? (should I just go piggyback?)
Will the stock injectors be fine at 14psi boost?
I will be have a shop do a complete custom exhaust from manifold. (has anyone found a turbo header manifold online?).


I'm here for advice. If I am wrong on anything I have stated above as far as facts, point it out if you need to.