Is $36.00 too much for a k&n air filter? Also, do I need to adjust jets due to lower vacuum at venturies?????
dbb

 

No that is not too much money, thats about the average price. You do not need to change any thing on your carb either. rx7doctor

 

sweet. thanks doc.
dbb

 

well i bought one and i dont see much of a differnce in my car..feels pretty much the same to me. dont think 36 bucks was worth it..but idk what are everyone elses views on this.

 

When I first got it I installed it at the same time than the Bonez intake kit, and did notice a difference, especially at WOT when the secondaries open.

With the current set-up, sterling carb with mech secondaries, RB air filter box and the K&N filter, all in all makes for some impressive CFM.

Hell, with the RB muffler, which is relatively silent, even though I have headers, if I floor it in neutral, opening the mech secondaries, there is more noise coming from the intake suction than from the exhaust!

 

I never saw any difference at all. That is why I dont use K&N anymore. More money no more difference, except that it is re-usable.

 

I got a taller K&N filter than stock and made a lid thing. Basically the top of the filter sticks up higher than the stock box. Its hard to explain, heres a drawing. My digicam sux.

 

Like cdrad said, i can tell a difference mostly when i use the mech. secondaries

 

The other advantage to a K&N is you pay for the filter + cleaning kit ONCE. That $36 filter plus the $20 kit = 1,000,000 miles of clean air. Check your gas mileage too because non-paper filters tend to flow better as they get dirty where paper filters don't, there may not be any more power, but the engine wont work as hard to make it.

I hate to sound like a commercial, but K&N (and its competitors) make a product that makes sense to me.

 

Flow good . . .

barely ever changeing good . . .

K&N good . . .

MoFlo MoPower . . .

 

Just as I am debating what to do for a filter, this topic comes up. Good question... Is the K&N worth it??

Here in Ontario the cheapest I have found the K&N filter for my GSL-SE (square drop-in filter) is CAD$87 (about US$60). An OEM filter from the local Mazda dealer is CAD$38 (about US$26).

So, you can see that we are not talking chump change to switch to the K&N.

Is it worth it? (my 7 is stock)

Roger

 

Yes ! ! !

 

As for the GSL-SE... I haven't put one in mine yet (plan on doing it soon) but in the FC it made an immediate and noticable difference. It didn't add any power really, but the car was much smoother all throughout the powerband, and also kicked my powerband up a bit. Of course, my GSLSE makes power all the way up to redline already..heh. The FC and the GSL-SE are very similar in design, so I would expect it to help a bit in this car, especially if you build a cold air box and have a free flowing exhaust.

*edit* I should point out Im using a 3" cone filter, not the drop-in stock type.

 

Do you have any pics of your intake setup? I am toying with the idea of modding the intake.

Roger

 

1 K&N ~= 3 OEM paper filters. Considering paper filters are supposed to be done every 5,000mi/8000km (I think) the K&n will 'pay for itself' in less than a year.

 

Birdman, on the se you want to run the adapter at the end of the afm and run a good size
cone filter on it. The stock se box unless modified with something like the vented headlight
to feed more air is too retrictive on it's own. Spectre part # 8141 avilable thur maybe a napa
or autozone or whatever you have there is the # for the adapter, then just figure out what
size filter you want. rx7doctor

 

On the FC, there's really nothing to see. 3" cone filter hooked directly where the stock air box used to be. S5's require no adapter or anything, and I didn't build a cold air box for it.

Go to the second gen section and search for "cold air" and you'll see some good threads about making cold air boxes. The GSL-SE's intake setup is identical to S4 FC's, so anything that is said there will apply. Me, I'm too lazy to build a cold air box since the FC runs fine without it. That remains to be seen with the FB.

 

So rx7doctor, the adapter attaches to the large 4" air stock air hose that is already there?

R

 

Nevermind, I just re-read your post and looked at the FSM pics, I get it.

Would the cone filter need to be supported at all (weight-wise)?

Roger

 

Yes, you would want to make some sort of support that would attach to the back of the afm to one of the existing bolts that normally holds the stock air box in place, rx7doctor

 

What would a good description for this "Spectre" part be? In case the person behind the counter looks at me like I have 2 heads?

Would putting the cone filter where the current stock air box less restrictive? Or should I try to route the cone in front of the radiator? If just putting the cone where the box is works well, then I might just do that.

Roger

 

Just tell that person what you are doing and if they have a spectre catalog they will know
exactly what it is. rx7doctor You can locate it in front of the radiator with alittle bit
of Fabrication. It will add alot to the top end, rx7doctor

 

Great! Thanks. It will be a couple of weekends before I can do this. I'll report back on the progress.

Thanks again!

Roger

 

Did that, about 20k ago, added NO top end! Breaths better but runs no different.