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Message: <blockquote data-quote="ALBundy" data-source="post: 380556" data-attributes="member: 15">The biggest challenge in installing forced induction units is getting the tune right, more so in a tropical country like Malaysia, where humidity is high and ambient temperature is high.  Lowering the compression ratio to 9.0:1 may solve the problem, but you will lose out on the response and ultimately the hp gain. There are some sites, that could generate some estimated hp calculation given the compression ratio + turbine pressure = Effective Compression = Engine HP.  The current trend is to use forced induction with high compression engines, like the Golf GTi, BMW 335i and etc. High compression engines with forced induction will generate a lot more low end torque with little lag. The 335i runs with 10.5 compression ratio with a 0.8 bar (about 11.8 psi)turbo boost.  It is even more crucial (in my opinion) to run higher compression in a supercharger setup, given the fact that the supercharger will ONLY generate maximum boost at the redline unlike a turbocharger. In other words, at low rpm with the lower compression engine, you could worse off than running NA, and only gain torque possibly at the midrange + top end.  Hope your engine will run well this time around, it has been sitting at Fatty's shop for ages <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> Cheers</blockquote>

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