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Car Forum / Nissan / Nissan Z Cars / June 2005Air filters
Hi there fellow zedders! I have been contemplating changing the air filter on my '91 z32 300zx Non turbo for a low cost power increase. After doing some research, I'm still unsure about which way to go. Steve T mentioned that "oiled" air filters clog up the air flow meter, so that rules K&N out. Because the air box contains 2 filters, it makes it twice as expensive as normal to replace the standard filters. Someone mentioned to me that Pod filters cause the engine to act like a dog at low revs, which is where I spend most of my time. So that leaves me with what I have at the moment! I was thinking about installing a cheap(AU$30), replaceable, "dry" pod filter. Can anyone give me some more info about which air filter gives the best performance results without costing an arm and a leg? Does anyone know a good store/company in Australia? > Hi there fellow zedders! > > I have been contemplating changing the air filter on my '91 z32 300zx Non > turbo for a low cost power increase. Not likely to happen.. You think they would leave 20HP or even 10 on the table in the air filter housing and then would use variable valve timing to gain it back? > After doing some research, I'm still unsure about which way to go. > [quoted text clipped - 3 lines] > Because the air box contains 2 filters, it makes it twice as expensive as > normal to replace the standard filters. Look at the filter area and then think about how retrictive it could possibly be compared to the hole in the AF meter. Here's a clue, the twin turbo can make over 400HP still using this same filter setup. > Someone mentioned to me that Pod filters cause the engine to act like a > dog at low revs, which is where I spend most of my time. > > So that leaves me with what I have at the moment! Exactly. IMHO you're better off spending some money on the other end of the engine (exhaust system) and/or a ECU tune upgrade.  SignatureSteve http://www.atlantaracing.com >Look at the filter area and then think about how retrictive it could >possibly be compared to the hole in the AF meter. Here's a clue, the twin >turbo can make over 400HP still using this same filter setup. 2nd clue the AFM can flow enough air for 500bhp. >>Look at the filter area and then think about how retrictive it could >>possibly be compared to the hole in the AF meter. Here's a clue, the twin >>turbo can make over 400HP still using this same filter setup. > > 2nd clue the AFM can flow enough air for 500bhp. And why would a NA need to change either one!? :-) The last clue is the factory turbo exhaust which is better flowing than the NA one can barely support the stock HP rating and is the FIRST thing that needs to be replaced... People forget than each car has it's own bottle neck. For the early 280EFI cars, it's the intake manifold, for the late Z's it's the exhaust system. You can't just assume what works on somebodies honda will work on your Z car. SignatureSteve http://www.atlantaracing.com > Hi there fellow zedders! > [quoted text clipped - 5 lines] > Steve T mentioned that "oiled" air filters clog up the air flow meter, so > that rules K&N out. I'll have to respectfully disagree with Steve on this one. The K & N or JWT filter will be fine for your car, and is probably the best route to take. If you follow the directions, there is no danger to your car, and there will be some performance enhancement. There are thousand upon thousands of Z owners that have switched to this type of filter without problems. Just don't over oil the filter. Dustin >> Hi there fellow zedders! >> [quoted text clipped - 9 lines] > JWT filter will be fine for your car, and is probably the best route to > take. Just curious, did you dyno test your car before and after or are you taking the "salesman's" word that it does anything measurable for performance? I really think most people read the hype, hear the intake noise and then "feel" the power... Money is much better spent on the exhaust system. SignatureSteve http://www.atlantaracing.com >>> Hi there fellow zedders! >>> [quoted text clipped - 17 lines] > really think most people read the hype, hear the intake noise and then > "feel" the power... Money is much better spent on the exhaust system. I didn't take a salesman's word. I'm no mechanic, but I'm hardly a novice when it comes to the Z32. The JWT filter on my car was installed before I purchased it, but I would have upgraded anyway. I don't disagree with your statement about the exhaust system, but the $90 for a JWT intake is worth the money, in my opinion. Ideally, the installation of a JWT intake should happen in conjunction with a less restrictive exhaust system, but if he's only interested in changing his filter right now, I'd recommend that he purchase the JWT. Dustin |
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