Aftermarket Engine Air Filter

Discussion in 'Gen 2 Prius Accessories & Modifications' started by NROhioPruis, Jun 25, 2008.

  1. NROhioPruis

    NROhioPruis Junior Member

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    has anyone looked into the aftermarket aif filter that claim to boost HP and economy for the Prius? it looks like this

    [​IMG] by injen? it cost almost 50 bucks, but if gets me better mileage, it might be worth it.
     
  2. firepa63

    firepa63 Former Prius Owner

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    Snake Oil...!
     
  3. prius4ed

    prius4ed Member

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    My 2004 Prius air box (air filter housing) was damaged in an accident. Instead of replacing it with an OEM box and MAF (mass air flow) sensor, I would save a lot of $$$ using an aftermarket cold air intake filter & pipe. Will need to somehow attach it to the OEM MAF sensor. Anyone have any clues for this, and a lead on the intake kit? I see them on Ebay for $40-50.
     
  4. prius4ed

    prius4ed Member

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    Anyone have a used or new Prius air box (air filter housing and mass air flow sensor) for sale cheap?
     
  5. GatorJZ

    GatorJZ Member

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    No, it's not. Injen filters are a very popular modification. I would like to see dyno data for this particular application, but in general Injen makes high quality stuff.
     
  6. cairo94507

    cairo94507 Active Member

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    I echo the request for dyno results to confirm the gain, if any. When it comes to my daily driver, I do not mess with the power train.
     
  7. tnthub

    tnthub Member

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    Generally speaking, the intake of the Prius is quite efficient from the factory. Although I have personally seen gains up to a couple of miles per gallon using aftermarket intakes on conventionalvehicles I have seen no real world results in the Prius that would warrant going in the direction of an aftermarket intake. Maybe I am wrong, but a Prius with a stock clean air filter seems to do just fine without the fussing around with cleaning the filter every couple of thousand miles (depending on environmental conditions).

    The majority of filter aftermarket filter designs allow more air into the engine to breathe more efficiently. The bottom line is that by allowing more air they are also allowing more contaminants. This may not be a big concern in a urban area with lots of blacktop and one season all year round, but where I live with country roads, sand and salt in the winter, and the wind off the ocean it would be a concern for me in regards to the frequency of needing to clean the filter without damaging it and making sure there is a very light coating of oil on it.

    Most people tend to put too much oil on the filters. The proper amount is basically a mist like what a 1950s housewife would leave in the bathroom after spraying her hair (I'm showing my age). ;)

    I use aftermarket filters in vehicles other than the prius and have had good success with them in regards to fuel economy and performance.

    Bear in mind that allowing more air into the engin places a greater strain on exhaust exiting it so the best formula (in a conventional vehicle), is to decrease exhaust backpressure while allowing a greater air intake. This allows the engin to require less go pedal to achieve desired performance, hence increasing mileage as well as maximum horsepower.

    In the Prius the goal is to utilize the hybrid technology to maximum advantage instead of maximizing the potential if the conventional engine (which is quite efficient alrady) so the gains, if any, I would expect to be minimal and likely not worth the investment in dollars and time associated with maintenence.

    Perhaps someone here can prove me wrong and if so that would be fine with me. :)
     
  8. ASavingMember

    ASavingMember New Member

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    what did you crash into?
     
  9. edthefox5

    edthefox5 Senior Member

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    I did some experimenting with it on this car as I have used the intakes like you have shown on other cars but on the Prius don't bother. This car is so tightly fuel mapped any alteration to intake air flow puts the MAF in a tizzy resulting in one bogging little motor.It runs the best with its stock intake. Unless of course you change the fuel map with software. More air requires more fuel if not it would run in a lean condition which is a very very bad thing.High cylinder heat and pinging. The car's software is designed to not allow that to happen.But then of course by re-mapping the car you are trying to get more performance out of the car which takes more fuel and then you quickly realize I'm doing this to the wrong car.
     
  10. mattpopp

    mattpopp New Member

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    Performance parts and a Prius don't go together. A high Flow air filter will not benefit you much unless you have a need for it. You are not going to get any better flow with the factory restricted exhaust. Even if there was a better exhaust it would not help the Prius. That is not a sports car. If you can fit a turbo or a charger on a prius then yes you will yes a benefit from it. Also why would you want to put a after market air filter on the car. In doing so that could effect the emissions, you effect the emissions and then you just killed the environment with a eco friendly car. That would not be any good at all. have to live with that label.
     
  11. REMPIE

    REMPIE New Member

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    mebay i can help,i work for a toyota dealership,i see many items & questions i can help with.cold air intake system or air box assy.
    what do u prefer? i can be reached @ [email protected]:tea: cheers mate
     
  12. problemchild

    problemchild New Member

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    I went to DYNO day for diesel trucks. The trucks were pumping out 900-1100HP. They suck a lot of air when running full throttle. We tested a truck with a KN airtube and filter and the same truck with a stock filter and tube and finally with no tube and filter. There was no gain in HP.
     
  13. F8L

    F8L Protecting Habitat & AG Lands

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    Are you here to contribute to the forum or simply to advertise your wares? If it is the later than you may want to speak with one of the mods regarding your desire to do so.
     
  14. F8L

    F8L Protecting Habitat & AG Lands

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    Regarding the NEW diesel trucks (particularly the GM Duramax systems) this information is correct but regarding nearly any other high HP application, the addition of a high flow intake system has been proven to increase HP due to intake and/or air filter restrictions. I've ran and participated in a large number of dyno day events and have seen this personally. My knowledge on diesels is more limited but my roomate runs a 2006 GMC Duramax and I get the diesel specific info from him as he has been a hard core race addict for quite some time with a stable of high HP vehicles. :)
     
  15. priusenvy

    priusenvy Senior Member

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    I highly doubt that. Far more likely is that you're confusing lb-ft of torque with horsepower.
     
  16. F8L

    F8L Protecting Habitat & AG Lands

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    Aye, generally speaking 900+hp daily driven diesels are fairly rare but some hit the numbers. I used to street race back in the day and an associated friend, Adam Winslet, now toys with diesels and gets into that kind of HP range. Here is a listing of the results of a dyno day back in '05 here in Sacramento. I think THIS is the 8
    as well?

     
  17. Rakimb17

    Rakimb17 Junior Member

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    Hey guys,
    I want to get a K&N filter because they are great and last forever. I've had one on my old buick GN for about 90k miles. I'm not expecting to pick up any hp or mpg, I just hate buying a new filter every 4-5 months. But will the added air flow confuse the MAF? I've heard quirky things like this can happen to modded Toyotas, but my source was a dealer service advisor. Anybody using a K&N on a stock Prius?
     
  18. Genoz World

    Genoz World ZEN-style living

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    RAKIMB17 - yep, i believe that some of the toyota reps do say that the K&N air filters DO confuse and contaminate the sensors. I do recommend that you stay within the factory parameters, yeah its a bit of a pain to replace them, but i think it's relatively easy to do so on our prius's.

    I recognize your GN as an awesome car, my friend has a completely restored GNX, and that is a BEAST! We might race against each other, but i have a feeling that he might take me if i dont SQUEEZE! NO, not the prius, my 96 Grand Sport.

    that's my 2 cents and YES, i am running a K&N filter on my 96.

    cheers
     
  19. tochatihu

    tochatihu Senior Member

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    There are a few Prius with K&N air filters. The engine performance and fuel economy are not improved, but there is a potential savings in terms of paper filter replacement

    In the 2001-2003 model the air filter is directly over the MAF, so it is important to re-oil *lightly* after cleaning to avoid oil drips onto the MAF. In the new model Prius the engine air filter is relocated, so this may be less of a concern.

    On all Prius (or, all cars) there is the potential for the K&N to pass more particles. It seems wise to perform used engine oil analyses and keep ttrack of silicon. If that goes high, we can be pretty sure that the K&N is not right for you.
     
  20. Rakimb17

    Rakimb17 Junior Member

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    Thanks,
    A GNX? Put that baby away for a few more years. It'll be pushing $60-$70k. I wouldn't race him. Your GS is FWD? If your buddy has a true GNX then he has a ladder bar that helps him put more power to the pavement. If he will give you 3 car legnths then maybe you can take him.
    And don't squeeze, BOOST!:rockon:
     
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