2004 Supercharged Roush 380 - Mustang Evolution

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Old 07-26-2012, 01:58 PM   #1
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2004 Supercharged Roush 380

I have the above which is absolutely as finished and sent from the Roush factory.

How much extra power can be had purely by changing the pulley and tuning? (and bigger injectors).
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Old 07-26-2012, 02:23 PM   #2
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Re: 2004 Supercharged Roush 380

If I remember right its a basic GT motor with a supercharger correct? If this is the case (4.6L 2v) then your internals will hold up to around 425-450rwhp for a reliable daily driver (manual trans numbers). That should be around 12psi or so I would think (inter-cooled of course).

Is the stock boost around 5-6psi? Is it an Eaton M112 or what, if its an M90 it wont be as efficient if you put more boost, neither with the M112 though (16psi is the most I would do on an M112 though)

regardless you should be able to get some good gains by upping the boost, assume each psi increase is gonna net you about 10rwhp-12rwhp~

As far as when/if your MAF, Injectors, fuel pump etc will hold not sure, no idea but they may be ok for a bit of an upgrade.
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Old 07-26-2012, 03:28 PM   #3
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Yes stock bottom end with m90 blower.

I'm not looking for much, really just interested in what may be possible without major investment.
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