on my 02 path i took out the silencer of the air filter box in my shii got a lot louder and gave me a better boost after about 2500 rpm but after about 2 days when the car was idle the rpm wasnt idle it was a bit jumpy so i put it back in. i dont know if it was the wind cuz it was a bit windy in my area. my friend on his gti drilled a couple of 1 in holes in his air filter box. i was wondering if what made my idle speed so jumpy and if i should drill one big hole or a couple or not do it at all?
I'd leave it just as is. This is a perfect example if you discovering the compromises that the Nissan engineers spent many many hours engineering away from. I've seen Rangers do the same thing -- put on a cone filter and the thing idles screwey.
Engineers need to find the best compromises to all the problems. No air box = lots of power, poor driveability. Air box = less power, perfect driveability. Anything you do to the truck, you're throwing away all that R&D at Nissan and going out on your own -- sometimes it works, and sometimes it doesn't. I'd say keep it stock. If you want a race car, sell your Pathfinder and get a 350Z. If you want to boost power on your truck, you'll have to be very careful not to do anything that's not reversable, in case something gets messed up (and it probably will). The filter box is a perfect example! Luckily, you simply removed it, didn't like the outcome, and switched back. If you drilled holes, that's more permanent, and if you didn't like it, you'd have to either patch them or get a new air box.
tru tru u got a point i do have other cars that i can drive for speed but i love power so im tryin to do watever i can without spending that much to get my power. i know if i spend money on the path then ill go all out n it will b able to take cars on the street and i need it to stay as a suv. i even bought the maintance pkg with the car so i can restrain myself from adding stuff. i think ima try taking out the silencer again mayb it was the wind. ima hold off on the drilling i was doubtin it too. did u say if i put a cone it will idle too??
If you put in a cone filter, that may have the same effect as removing the air box silencer. I don't know. You'll have to try it yourself and see. I put a cone on my Cadillac Seville and didn't like it. I put the factory stuff back on and it's back to normal. Cost me 70 bucks to figure out that what the engineers did to begin with was the best solution!
Doubt it has anything to do with the wind. Was the box you removed before or after the MAF? Did you reset the computer? If the box was after the MAF, it sounds like a vacuum leak. My truck at times idles a hair rougher than stock with my current set up/ You can/should unplug your battery for at least 15-30 minutes when you change something so the ECU can learn the new parameters (in this case for airflow) faster.
I agree with Ag - I removed the snorkel on my V6 to fix the duct that was cracked (at the end). When I did that, I noticed immediately the idling was a little jumpy - but the truck was more responsive when driving. Its been a few weeks sense then, and the truck seems to have adjusted to the change bc the rough idling is gone. I'm going to see how long the air filter lasts before I decide to put the snorkel back on.
Thanks
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Current Wheels: 86 SVO 1E, 89 Nissan D21 VG30E, 50 Fleetline Cpe
Past Wheels: 94 Vette LT1, 01 Vette Z06, 87 Vette L98, 80 Vette L48
i thought that you only have to disconnect your battery when you add something to the car?? hey car guy the response on my path is also better like what you felt. you said your truck got used to the idlein after a few weeks?? i didnt wait that long once it became jumpy i put that shii back in i didnt wanna fuq up my car. mayb ill try it for a few weeks. i did take out the silencer again today and it wasnt as jumpy as before. mayb ill try taking it out for a week or two but i don wanna mess up my engine.
Yeah - I'm definitely no wiz on the truck computers(and I don't know if disconnecting the batt. does a hard boot), but I'm under the impression the puter attempts to compensate as much as it can for changes like fuel octane, intake, and exhaust. I would give your mod. an adjustment period and see if the idling clears up.
Yes, once the battery is disconnected, all the learning the computer has done is gone, and it starts from a baseline fuel and spark map. The theory is, reset the computer like this when you make a major modification so the computer can learn the maps with the new equipment installed.
Sometimes this works backwards. Two separate buddies of mine with Ford Rangers had the same experience -- the computer didn't seem to notice the K&N cone filter until about 1000 miles after it was installed. They disconnected the battery and hooked it back up, and all was good for a while. Then, 800-1000 miles down the road, the check engine light came on (because of the filter). If they put the stock equipment back on, it was all good.
hey jadcock you shoulda sold your cutlass maaan tha was nice car. your caddy is nice im looking into buying one too. that cutlass was nice. i had a 94 passport and i loved that car i regret selling it too
Thanks man. Yeah, it was a nice car. It was just time for something different I think. The Cadillac Seville has always been my dream car, ever since I saw the 1992 STS in Motor Trend. I had a chance to get one, so I went for it. No regrets so far. I just got married and we're looking to start a family soon, and the four doors and 30 mpg won over the two doors and 18 mpg. My wife drives the Cadillac now, and I got the truck for me.
I have been running a cone filter (sans factory air box) for about 4 years now. The factory box is more restrictive and acts as a silencer. I have had no problems with this setup--no jumpy tach, rough idle, etc. It is noticably louder with just the k&n cone filter and gives a little more power. The only drawback that I have with this setup is getting mud/water in the intake (which happens very rarely). I am getting a drywrap from K&N to give a little extra insurance. Note on the engineers: I have 4 family members who work for Nissan---some things are done to be cost effective and not for performance. I would definitely tell anyone to dump the stock air box and factory exhaust system for more power.
I said that engineers try to find a good compromise between all the issues about a given system. The airbox for example. One of the reasons for the airbox is insulation from underhood heat and moisture. But putting in a cone, you're sucking in all that hot air, and you're allowing water into the system. Yeah, that sounds great!
Any perceived performance gain is likely due to the increased noise. I doubt you really got more than 1-2 horsepower from that filter...and that's at a high rpm speed. If it's worth it to you to allow less filtered air into your engine, and possible water intake, then I guess the cone is for you...
air filter box
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