It has been known for years that high flow air filters = crappy filtration. On your Corolla or Corolla XRS, you will NOT notice a difference in power, period. You may think you do, but you don't. The only increase you will have is the amount of dirt ingested into your motor. On a forced induction setup, the stock airbox and filter will be a weak point, but not on a naturally aspirated motor.
the stock airbox and filter will be a weak point, but not on a naturally aspirated motor.
Wish I knew this before spent $200, but then how do these companies show dyno numbers up etc? And there are a plenty of forums showing increase in HP/TQ on dynos...
The increase in HP and TQ between dyno runs could vary that much based on many other factors. What you will get, a tad better throttle response, but you will gain little, if any power. Dyno companies fail to mention this fact. I have made 15-20 more hp on the dyno between runs with NOTHING different. The car was just happier on one of the runs. Now, if you are actually maxing out the stock airbox/air filter, then yes, you will see a difference. You simply are not going to do that on an NA Corolla though.
To really see an increase, there would HAVE to be tuning to change the MAF readings to take advantage of any extra flow, otherwise your car will just compensate for it. This has came up before on some other forums I am on. We ran a stage II STi on the dyno with a stock airbox and filter and with an aftermarket short ram and got within 5hp, well out of range of a measurable power difference once the other factors come into play. Now to be fair, on that particular car, after tuning there is definitely a difference. But thats forced induction vs. naturally aspirated.
Last edited by v8eaterWRX; 05-06-2011 at 11:35 PM.
Wish I knew this before spent $200, but then how do these companies show dyno numbers up etc? And there are a plenty of forums showing increase in HP/TQ on dynos...
The dyno results do prove that an intake can give you around 5 hp. It's always going to be up for debate what difference there really is & that debate will never really end. I've used performance air filters for 30 years and my engines have gone past 200k & 300k miles and still ran great with no issues of engine wear or oil use. It may make a difference but when that actually happens who knows.
__________________ 89 Supercharged White MR2 5-speed / 09 Corolla S CSM 5-speed
07 Matrix XR Gray Pearl 5-speed (sold 11/23/11)/ 94 Corolla DX Red 5-speed / 95 Previa S/C White Auto/
07 Corolla CE CSM 5-speed/ 10 Prius III Blizzard Pearl
The dyno results do prove that an intake can give you around 5 hp. It's always going to be up for debate what difference there really is & that debate will never really end. I've used performance air filters for 30 years and my engines have gone past 200k & 300k miles and still ran great with no issues of engine wear or oil use. It may make a difference but when that actually happens who knows.
This is less about the power and more of the poor filtration etc, I'd love to see more insight. I'm amazed this hasn't come up at all here!?
Wish I knew this before spent $200, but then how do these companies show dyno numbers up etc? And there are a plenty of forums showing increase in HP/TQ on dynos...
they lie or mislead you, just like all that stuff as-seen-on-tv. if it were so easy to gain power/tq while maintaining proper AFR's then the car would come that way from factory. the only way to get real gains worth the $$ is forced air.
I bought my K&N not for the performance increase but for the convenience it and money savings offers over buying a new paper air filter every year. Been on the car for 7-8 years now and it's been nothing but great.
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Originally Posted by TURBO Das Automagazin
A BRZ, a curvy mountain road makes one liter of happiness hormones.
they lie or mislead you, just like all that stuff as-seen-on-tv. if it were so easy to gain power/tq while maintaining proper AFR's then the car would come that way from factory. the only way to get real gains worth the $$ is forced air.
I mean from actual people, they have shown gains on many different cars/dynos etc etc. I understand how it can change slightly but they show air/temperature etc etc as well...
If this is actually well known I'm really surprised people here haven't spoken up on it.
I bought my K&N not for the performance increase but for the convenience it and money savings offers over buying a new paper air filter every year. Been on the car for 7-8 years now and it's been nothing but great.
I have to give a big +1 to that. I expected and experienced 0 difference in changing to a K&N drop in filter. I purchased it and a recharge kit simply because it would be cheaper in the long run than replacing the paper filter.
This is less about the power and more of the poor filtration etc, I'd love to see more insight. I'm amazed this hasn't come up at all here!?
That is why I gave my personal experience of using performance filters. I've used them on many cars without any issues. I even had my old Tercel engine looked at after I put a 4AG into it from a MR2. My Tercel's 3AC had over 300k miles & the engine parts were in excellent condition with little to no wear. The car always used Mobil 1 oil from 5k miles & performance air filters for everything but the first 50k miles. I had them check it out for wear issues to make sure that what I was doing to protect it was working, and most of those miles came when I lived in New Mexico where there is a lot more dust, sand & air borne dirt than here in the damp NW.
__________________ 89 Supercharged White MR2 5-speed / 09 Corolla S CSM 5-speed
07 Matrix XR Gray Pearl 5-speed (sold 11/23/11)/ 94 Corolla DX Red 5-speed / 95 Previa S/C White Auto/
07 Corolla CE CSM 5-speed/ 10 Prius III Blizzard Pearl
wont increase any noticeable hp, just sound and looks and perhaps the convenience of just cleaning and re-using the after-market filter. however if your using a pre-oiled one u still spend money on the oil/cleaning package.
are they bad for your car ? depends on where and how you drive and how you maintain the car. thats why manufacturers play it safe overall and you see the same setup in every car for the stock airbox/filter, from our corolla to a super-car, they all have the same plastic airbox with ribbed pipes going into the throttle body, only difference might be the filters they use but guaranteed they do not use pre-oiled filters.
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