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I went to my local auto shop after discovering I was missing an air filter for some odd reason. I picked up a RACtive open end tornado style filter.



Anyways, Since putting this on, the noise that is experience from the AEM filter above 4k is no longer as loud but still noticeable. Instead throughout the powerband you can hear a distinct noise from the filter, aka typical intake sound. And although not as loud, it seems that my performance has jumped a tad with the open end filter. At 4k in 4th gear I was about 80mph and now at 4k I am more so at 83. In 3rd gear I usually sat at 50 at 4k, now at 4k I am at about 52.

 
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Your rpm's still seem way high. I can cruise at 80mph at around 3000-3200 rpm. I have an automatic though.

 
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My 01 EX manual is at 4k at 80

 
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I have an 02 EX manual.

 
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Hmmmm I wonder why the automatics run at that much lower of an rpm.

 
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cause the automatic is a 4speed so the gear ratios are different than a 5spd manual. At 80 in 5th gear I am pretty low in RPMs

 
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Gotcha

 
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I don't see how changing your air filter makes your car go faster at the same RPM.... I think thats all based on the gear differential. You should always be doing the same speed at RPM's no matter what mod you do, unless you change your gear box...

 
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Changing your ECU can affect your speed at different RPMs.

 
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Or tire size to a taller or shorter tire.

 
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What if you look at it this way? The rpms are an indication of how hard the engine is working. If you can make the engines work easier then the indicators (rpm) should show this. So when you add an intake you allow the engine to breath easier and there for the engine doesnt have to work as hard which would indicate why the rpms are now less. Make sense?

 
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yeah but everything is linked up mechanically..... its all bases on a proportion, when the engine is turning at a certain RPM, there has to be some sort of gear reduction so your wheels dont spin at the same RPM as the engine. I don't see how this can change, without some serious modifcations to the drive train... I can see making the RPM's move up faster, but you can't just go chaning your speed at different RPM's....

 
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hes right....unless you change something a gear ratio, tire size or something like that the speed will always be the same at a given gear and rpm....you just made it a little easier on the motor. if you had a boost guage you could use that to see how hard the motor is working to maintain a certain speed.

 
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so when you tow a trailer with a truck and the rpm's are higher but youre going slower, thats because the gears are automatically changed throughout the drivetrain.... hmmmm dont think so
the engine load can be reduced and thus free up power to move the wheels more efficient;y, if we had no transmissions in our cars, then the speed would directly reflect the engine's rpm

 
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think about it.....its all interconnected, the wheel turns a set amount every time that the crank turns. how is the wheel going to turn faster than the crank lets it. its impossible.

 
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thats what the transmission is for...the change the rate the wheel turns in comparison to the crank.

 
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I don't buy it, maybe in an automatic, because when you are pulling a trailer it might shift gears to compensate for the loads, but in a manual, I think even pulling a trailer the RPM's and speed would match the same as without the trailer....

 
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yeah....are you sure theres no overdrive that might be switching on and off in this turck of yours

 
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the truck is manual, and i dont mean the wheel turns faster, because yes that would be impossible, but rather the wheel turns slower... hmm wait i see your point his is turnin faster now which is impossible.... nevermind sry