i saw on the one of the forums a discussion about removing your resonators. if you do not have some sort of after market filter or tube assembly on your car removing the upper resonator will do more harm than good. the upper resonator is there to hold extra air for the engine until the rpms get high enough to pull the right amount of air into the engine on its own. if you do not have the aftermarket parts on the car you are needlessly making your engine struggle until it gets to about 3000 rpms.

Are you sure about that?

Even at 2000 RPM, a 2.0L motor is moving 17 gallons of air per second. A two-pint resonator isn't going to make much of a dent in that ... :?

S/R comes stock with a iceman, once you start talking about what your talking about, its velocity vs cfm , and CFM wins :twisted:

im sure it also helps to keep your engine run smoother at idle. it is there for a reason. if you have an iceman on the sr the tube itself has smoooth bends in it this helps to keep the airflow unfeathered on its way into the intake manifold. the stock intake on the zx2 is very decent for a stock system and is very classifiable to be a cold air intake but it still doesn't have the flow capabilities of the smoother bended aftermarket intakes.

It is there for a reason. Most people don't like to hear their cars, so the engineers have to account for this while designing a system. Think of a muffler, it's basically a large cavity with an inlet and an outlet. The resonators are the same way, just the inlet is the same as the outlet. They're designed to buffer the pulses from opening and closing inlet valves, and slow the charge of air down. Those two combine to make a very quiet engine.

Take them out, and the car pulls better all around, same with pulling off the muffler (although the rest of the stock piping is a bit more of a cork than the muffler is)

your absolutely right about engineers putting it in there for the purpose of reducing noise but you also have to think of other reasons they put things in stock cars the way they do. i have owned 3 zx2s and the first one i bought i financed. when i took it to the dealership to have it serviced i asked them why there were two resonators on the car. they said the lower one was for noise only and the top served two purposes. noise and extra air. the only reason i asked was because i changed the intake and they wanted to strip my warranty for it. but i also agree with what you said about it being there so people dont complain about engine noise.

its not there for extra air, thats bull shit the engine sucks air , it does not store it. The faster the air can travel into the engine, the faster the engine can turn over. Take a straw, suck through it, now take a cup and put a hole in the end the same size of the straw and suck through it, tell me which one is easier to suck air through. The straw will be for the fact that it is more streamline.

Rule #12 never believe anything a mechanic at a dealership tells you especially a FORD dealership. They voided my warraunty, why? because they never saw a clutch LIKE mine, and my clutch came stock in my car!!

This is actually a pretty good discussion. If I had the means, I would definitely figure out the hydrostatic pressures inside of the upper and lower resonators and see what happens with them under load.

it doesn't really seem to be, inis was basically yelling at me for the problem i caused with this forum.

Doubt he was yelling.... tones are hard to interpret over the internet with words, but it seems to me that he was just trying to clarify his knowledge... he's just not happy when it comes to dealerships :lol: ... and basically niether am I. They'll tell you pretty much anything because as a mass... society is automotive retarded and they can get by with it.

But as for my opinion on this standing discussion... the resonators do exactly what they were put there for... noise reduction. Thats pretty much it... if they do "store" air persay... then its not gonna be of a significant amount to do anything or affect anything if it were removed.

You haven't caused a problem, and are as welcome as you have always been. inis got a bit out of line there.

Perhaps the idea about removing the resonators being harmful comes from using PVC instead of exhaust pipe up there. A 2.5" piece of PVC, while it might fit the clamps, is much narrower diameter than the resonator was.

all that i tried to say was to not replace it unless you put other aftermarket parts on the car. the air doesn't flow right until you have smooth bends on the intake. that spring looking part on the stock intake messes up the airflow into the engine that resonator helps to smooth it out at low idle. after that the engine does a good enough job of pulling air in on its own. i never said that just taking it out was a bad thing. it follows the same concept of throttle body spacers. you make more space for the air to come back to a good even flow.

i have a hotshot intake on the car right now, the biggest power gain from that intake is the smooth bends in it, that is where most of the power comes from. its just like exhaust. if you put the same diameter exhaust on a car as it had stock but you have the exhaust mandrel bent for a smoother pipe you get more power. i wouldn't be making an idiot of myself if i hadn't looked into it in the first place. if you disagree with me that is fine and it doesn't bother me nor do i look down on people for it because they are entitled to their own opinion.

there is a fine line when it comes to what is a warranty item and what is not,what caused a part to go bad and why it is not covered. one thing people have to understand is that once you start modifying your car(that is still under warranty) you are taking a chance on voiding the factory warranty. mainstream cars just like the zx2 were not designed to race nor was it designed to be a mustang-killer or a muscle car. this car was designed to be a mass produced car that is both economical and affordable.

Just an FYI THOUSANDS of zx2 owners have removed the upper and lower resonators to only gain hp. It will not hurt your idle. It will not make you lose hp. It has NO ill effects at all. The tiny cavity it has will not store enough air for even one revolution of the crank. It is useless.

You can argue me all you want BUT I have had had every intake for this car and the only ones that changed the idle for the worst were the 3" intakes(and it was barely). Also, I have had 2 different keman setups BOTH ran perfect and idled EXACTLY like stock.

Also the stock intake even moddified is not good once you have a good bit of mods. It is a weak link in the system. Yea sure the intake is great....while your stock. Once you get to the full bolt on stage or even further...it can only hurt you to have it there

(and dont think I am yelling at you cuz Im not. Neither was Inis.)