Re: supercharging the 4.7
I suggest not getting "boosting" advice from a naturally aspirated forum. I've been building turbo cars for 15 years and there's a slew of mis-information in this thread alone. I'm about to boost a 4.7 in my 4Runner.
weak engine parts won't cause engine failure, they'll only give you less room for error if tuning is bad. TRD supplied a computer with excessively aggressive timing and fuel curves for the 4.7L variants. If you get a tunable computer however, and use something to keep intake charge temps down, like a water/meth injection system, you can safely boost this engine all day long.
pm me if interested.
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