Cold air Intake? - Not a Joke or Noob question

That baffle box is an intake resonator. It's tuned for the Prius to reduce noise while creating optimum air flow. Given the finely tuned nature of the Prius engine, removing yours is not a great idea.

Tom

 

I removed it all on my old car. Just ran the oem airbox most times, even fabbed up a piece of piping and attached it to the side of the box and feed it down through the hole where the original intake piping was. Slap on a cone type filter, remove the oem filter and instant intake. Throttle response was slightly better but nothing to jump up and down about. I would do it again though just to get all that crap out of there.

 

I've tried removing the entire intake assembly and even the filter while drag racing and I could not pin down any benefits. State of charge seemed to make the biggest difference in ET.

If you're happy with the mod and no errors pop up then good deal. I'd be a little skeptical of a mpg change without rigorous testing.

 

Be careful when you remove the white resonator box as your ice can ingest water and lock up. Have had it happen here to a gen 2 taxi with 7000km on the clock. Point said you have to live in an area that has water over the road when it belts down with rain.

 

Haha - it's been a long time since I've seen someone get warned about water ingestion with a cold air intake. Oh the old days of modded civics and wings west bodykits....

 

for the amount of gain you'll get, the increase level of engine noise from an already noisy engine won't be worth it IMHO

 

I didn't notice a difference in intake noise, of course my exhaust was modified too so...

 

i know this is a little old... but...

what about the gruppem intake for the GenII or Gen III

GruppeM - News - English » POWER CLEANER for Hybrid cars



Was the prius throwing codes with this??

 

(Theoretically) the Prius pushes 1/3 of the fuel/air mixture back upstream into the intake plumbing, if the volume of the plumbing can't hold it, you are letting fuel back into the under hood air and altering your fuel/air ratio.

As this fuel/air mixture has already been in the hot cylinder, your intake will not be 'cold'

 

Where is this information available? Is this in all Prius models? Why would Toyota design the system this way? Isn't the MAF supposed to make the appropriate adjustments??

I agree that this particular intake isn't the 'cold' version considering its drawing air from under the hood near the hot engine and not from the fender or other colder air location... However not sure why/how the engine would allow premixed fuel/air that has previously been inside the combustion chamber back into the intake system...

Even though this will prob make the engine a little more 'noisy'... I'm more looking to improve throttle response.

 

Atkinson cycle - Wikipedia, the free encyclopedia

There's also a patent from 1887.
Patent US367496 - ATKINSON - Google Patents

 

hmm..Interesting enough.

But where does it anything mention that the 1/3 of the fuel/air mixture back upstream into the intake plumbing goes beyond the throttle body, far enough past the MAF sensor to cause the cone style air intake system to throw codes??

From what I can see the MAF doesn't move closer to the throttle body but maybe even further away...​

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Shouldn't this be more beneficial than detrimental? ​

 

WELL! see my avatar? this very issue is what got me trolled on "priusonline.com". they posted up that pic after the southpark smug prius drivers there had a hissy fit over the idea of improving performance on my prius.
i made a cold air kit for it and ran it for about 50k. had a cone filter plumbed down in place of the resonator. didn't notice any difference in the '04 except the engine sounded a little better, cause i like a little intake noise-- like a 4 barrel's secondarys opening up. fuel mileage was the same, performance was still weak. i haven't put it on the '05, which by the way seems to have a little better throttle response than the '04. could the ecu software be a little better in '05, maybe?
i'm real curious about toyotechs exhaust mods. like to see some pix and evaluation.

 

because of the atkinson cycle intake timing, i wouldn't think changing the distance between the maf and throttle would be a good idea, unless perhaps you could get the ecu programmed for it. i didn't remove the filter box, only the tube that went down to the resonator.

 

All modern Atkinson cycle engines have delayed intake valve closing that allows fuel/air back into the intake tract. I may be wrong, but I think the MAF measures air only, it has no idea how much fuel is in it. (if any Atkinson engine had Direct Injection this would not matter, but they do not) Even if it has a 'cold' source, since 1/3 of the mixture has already been in the cylinder once, it is no longer cold, I believe. To improve throttle response, put it in Power mode.

 

...not aware of any such Power mode in the 2008 Touring or any GenII for that matter. Is this a mod or a hidden feature??

 

My bad, no power mode for Gen 2. Just the 1.8 liter engine, not the 1.5 liter in Gen 1, 2, and the c.