Quote:
Originally Posted by gtengr
The smart folks will datalog street runs to ensure the conditions on the dyno aren't too far off. It's really not that bad imo. The most practical way to select an intake is to look at the stock one and identify the restrictions. In some cases there are restrictions and sometimes they're pretty free flowing. It's important to keep the MAF reading properly too.
Based on my observations, high specific output NA engines tend to have pretty good intake and exhaust systems from the factory.
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i get that . the whimpy filterbeing replaced with a drop in with larger surface area seems to help. i would think another weakness would be the sound tube. not that deleting it instantly helps without a corresponding redesign of the intake, but i would think the additional outlet for the tube lowers the velocity of air reaching the manifold or creates some type of drag (i'm not a scientist m8).
i agree that its hard to find extra power in a high compression N/A engine. I suspect the FA20 is basically the FB20 but with higher compression and Toyota's direct/port injection. The FB20 puts out like 150bhp, so Toyobaru has essentially already tuned this engine for ~50hp increase over stock. Any gains left are going to be small until you start talking forced induction.