Quote:
Originally Posted by dayofpain
nope, ill say it again.
dont need a tune. cant stress it enough.
you CAN get a tune after removing enough weight from the dam car. or perhaps changing the spark plugs or a pulley.
the subaru computer is an amazing piece of work, it can and will adapt to quite alot and most people dont give it near enough credit.
and btw from what i understand the reason that the aps is so unique is because it flows EXACTLY like the stock box, meaning that changing the air fuel mix isnt required.
the reason it gains power is because it pulls different temperature air (which is easily measured and compensated for by the stock ecm). or at least thats what i read when it first came out in 2001.
people are way to quick to say "go get tuned" at every single piece of crap they throw on their car. its sickening that SOME tuners have brainwashed the entire community into thinking that.
im not saying im perfect but i got all of two pro tunes EVER, and i had a ton of parts come on and off my car. im sure i was missing out on a whole 5-6 hp for whole months at a time. sucks for me i guess.
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The only way a power mod without tune could be truly safe is if it was indistinguishable from the previous part. If that is the case, then why do it?
An intake mod can do one of three things at a given point. Provide a larger, smaller or equal MAF voltage for a given volume of air. While the ECU can deal with these in closed loop, it has no control in open loop to fix a problem. If it is rich, no big deal unless it is extreme, but if it is lean, this can be a problem. A little lean may improve performance on a stock car, but add two or three mods that cause even a little leanness or one big lean mod and you could be in KABOOM territory.
I'd also be hard pressed to believe there is a significant temperature difference between the fender and the stock intake with snorkus and even if there is, intake temperature is basically meaningless on a forced induction engine with any form of intercooler.
The bottom line is if you make any engine/power mod without tuning, at least take the time to do some logging to see what effect it has.