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Originally Posted by OllieNZ  Unfortunately for us guys with an eye on FI the M44 has been engineered for N/A performance and can't really handle much boost stock. From the research I've done so far the consensus seems to be 6-7 psi max, much more can lead to various failures pretty rapidly. The M42 is slightly better off as it has a forged crank but again to run more boost you'll still need to lower compression initially and then build the engine from there. If you've never come across Metric Mechanic before, I'd highly recommend checking these guys out. They really know how to build an M42/44 and are pretty open with what they do http://metricmechanic.com/wp-content...ne-Booklet.pdf |
I ran 10psi and 125hp shot of nitrous on my stock 168k engine for 2 years, 160lbs of nitrous through it in that time. It's currently on a stand as a emergency spare if I blow one of my built motors